/* =====================================================================
   VERTEX DESIGN SYSTEM — premium desktop AI (Cursor / Notion / Linear)
   ---------------------------------------------------------------------
   - Single source of truth for tokens, layout, components, motion.
   - Keeps 100% of the existing class hooks the JS/templates rely on.
   - Adds: .v-select*, .theme-card*, .md-code-head/.md-code-lang,
     .section-icon, .btn-secondary, .btn-outline, .page-transition.
   ===================================================================== */

/* ============================== 1. TOKENS ============================== */

:root{
  /* type */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --font-ui: var(--font-body);

  --fs-xs: 12px;
  --fs-sm: 13px;
  --fs-base: 14px;
  --fs-md: 16px;
  --fs-lg: 18px;
  --fs-xl: 22px;
  --fs-2xl: 26px;

  /* spacing */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;

  /* radius */
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  --radius-2xl: 22px;
  --radius-full: 999px;

  /* motion */
  --ease: cubic-bezier(.22,.61,.36,1);
  --dur-1: 150ms;
  --dur-2: 200ms;
  --dur-3: 250ms;
  --dur-fast: var(--dur-1);
  --dur-med: var(--dur-2);
  --dur-slow: var(--dur-3);

  /* icon */
  --icon-stroke: 1.6;

  /* layout */
  --sidebar-w: 260px;
  --sidebar-w-collapsed: 68px;
  --glass-blur: 18px;

  /* ---- base color fallbacks (vertex-theme.js overrides these inline) ---- */
  --bg: #0a0a0c;
  --bg-elevated: #101012;
  --surface: rgba(255,255,255,.04);
  --surface-solid: #17171a;
  --surface-hover: rgba(255,255,255,.07);
  --border: rgba(255,255,255,.08);
  --text: #f0f0f0;
  --text-dim: #a0a0a5;
  --text-faint: #606065;
  --text-muted: var(--text-dim);
  --accent: #e0e0e0;
  --accent-2: #c0c0c0;
  --accent-contrast: #0a0a0c;
  --danger: #e0596b;
  --success: #5cb880;

  /* ---- derived, theme-aware (computed at use from resolved vars) ---- */
  --border-light: color-mix(in srgb, var(--border) 55%, transparent);
  --border-strong: color-mix(in srgb, var(--border) 90%, var(--text-faint) 10%);
  --layer: rgba(0,0,0,.5);
  --code-bg: color-mix(in srgb, var(--surface-solid) 90%, var(--bg) 10%);

  /* ---- layered soft shadows (never harsh black) ---- */
  --shadow-xs: 0 1px 2px rgba(0,0,0,.05);
  --shadow-sm: 0 1px 2px rgba(0,0,0,.04), 0 4px 12px -4px rgba(0,0,0,.08);
  --shadow-md: 0 2px 4px rgba(0,0,0,.05), 0 10px 24px -8px rgba(0,0,0,.12);
  --shadow-lg: 0 4px 8px rgba(0,0,0,.06), 0 18px 44px -10px rgba(0,0,0,.20);
  --shadow-glow: 0 0 0 3px color-mix(in srgb, var(--accent) 16%, transparent);
}

html.dark, [data-mode="dark"]{
  --code-bg: color-mix(in srgb, var(--surface-solid) 68%, #000 32%);
  --code-head-bg: #1c1c22;
  --layer: rgba(0,0,0,.62);
  --border-strong: color-mix(in srgb, var(--border) 90%, var(--text-faint) 10%);
  --shadow-xs: 0 1px 2px rgba(0,0,0,.16);
  --shadow-sm: 0 1px 2px rgba(0,0,0,.15), 0 4px 14px -4px rgba(0,0,0,.30);
  --shadow-md: 0 2px 6px rgba(0,0,0,.18), 0 12px 28px -10px rgba(0,0,0,.40);
  --shadow-lg: 0 6px 12px rgba(0,0,0,.22), 0 22px 50px -12px rgba(0,0,0,.50);
}

html.light, [data-mode="light"]{
  --bg: #f5f5f5;
  --bg-elevated: #ffffff;
  --surface: rgba(0,0,0,.03);
  --surface-solid: #ffffff;
  --surface-hover: rgba(0,0,0,.05);
  --border: rgba(0,0,0,.08);
  --text: #1a1a1a;
  --text-dim: #666666;
  --text-faint: #999999;
  --accent: #555555;
  --accent-2: #777777;
  --accent-contrast: #ffffff;
  --danger: #c23c4f;
  --success: #3a9d6a;
  --code-bg: color-mix(in srgb, var(--surface-solid) 90%, var(--bg) 10%);
  --code-head-bg: #e3e3e3;
  --layer: rgba(0,0,0,.32);
  --border-strong: color-mix(in srgb, var(--border) 90%, var(--text-faint) 10%);
}

/* ---- legacy token aliases (migration compatibility) ---------------------
   Legacy stylesheets and older
   templates/JS consume these variables directly. We map them onto the
   canonical tokens here so every surface resolves to one design language
   regardless of which stylesheet the page was written against.            */
:root{
  --font-base: var(--fs-base);
  --font-sm: var(--fs-sm);
  --font-lg: var(--fs-lg);
  --font-heavy: 700;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --ease-spring: var(--ease);
  --scrollbar: var(--border-strong);
  --shadow: 0 8px 24px rgba(0,0,0,.18);
  --warning: #e0a050;
  --warning-soft: color-mix(in srgb, var(--warning) 14%, transparent);
  --warning-border: color-mix(in srgb, var(--warning) 40%, transparent);
  --code-header-bg: color-mix(in srgb, var(--code-bg) 60%, #000);
  --code-header-border: color-mix(in srgb, var(--border) 60%, transparent);
  --accent-soft: color-mix(in srgb, var(--accent) 12%, transparent);
  --glass-blur: 18px;
}

/* ============================== 2. BASE ============================== */

*, *::before, *::after{ box-sizing: border-box; }
html, body{ height: 100%; }
body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}
body::before{
  content:"";
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(700px 500px at 15% -10%, color-mix(in srgb, var(--accent) 6%, transparent), transparent 60%),
    radial-gradient(600px 500px at 110% 10%, color-mix(in srgb, var(--accent) 4%, transparent), transparent 60%);
}
a{ color: inherit; text-decoration: none; }
button{ font-family: inherit; }
::selection{ background: color-mix(in srgb, var(--accent) 25%, transparent); }

::-webkit-scrollbar{ width: 8px; height: 8px; }
::-webkit-scrollbar-track{ background: transparent; }
::-webkit-scrollbar-thumb{ background: var(--border-strong); border-radius: var(--radius-full); border: 1px solid transparent; background-clip: padding-box; }
::-webkit-scrollbar-thumb:hover{ background: var(--text-faint); }
*{ scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }

:focus-visible{ outline: 2px solid var(--accent); outline-offset: 2px; border-radius: var(--radius-xs); }
h1,h2,h3,h4{ font-family: var(--font-display); margin: 0; letter-spacing: -0.02em; font-weight: 600; }
p{ margin: 0; }
code, pre{ font-family: var(--font-mono); }

/* ===================== 3. GLASS + APP SHELL + SIDEBAR ===================== */

.glass{
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  border: 1px solid var(--border);
}
.card.glass{
  background: color-mix(in srgb, var(--surface-solid) 86%, transparent);
}

.vertex-logo{ display: flex; align-items: center; gap: 10px; min-width: 0; }
.vertex-logo img{ width: 28px; height: 28px; object-fit: contain; flex-shrink: 0; }
.vertex-logo .wordmark{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-md);
  letter-spacing: .02em;
  color: var(--text);
  white-space: nowrap;
}

.app-shell{ display: flex; height: 100vh; width: 100vw; position: relative; z-index: 1; }

/* ---- sidebar ---- */
.sidebar{
  width: var(--sidebar-w); flex-shrink: 0; display: flex; flex-direction: column;
  border-right: 1px solid var(--border); background: var(--bg-elevated);
  transition: width var(--dur-3) var(--ease); position: relative; z-index: 20; overflow: hidden;
}
.sidebar.collapsed{ width: var(--sidebar-w-collapsed); }
.sidebar.collapsed .wordmark,
.sidebar.collapsed .label-text,
.sidebar.collapsed .nav-group-title,
.sidebar.collapsed .user-chip .who,
.sidebar.collapsed .user-chip .chevron{ display: none; }
.sidebar.collapsed .nav-item{ justify-content: center; padding: 0; }
.sidebar.collapsed .chat-item{ justify-content: center; padding: 0; }
.sidebar.collapsed .sidebar-header{ justify-content: center; gap: 0; }
.sidebar.collapsed .collapse-btn{ transform: rotate(180deg); }
.sidebar.collapsed .badge, .sidebar.collapsed .nav-search{ display: none; }

.sidebar-header{
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  height: 60px; min-height: 60px; padding: 0 14px;
  border-bottom: 1px solid var(--border-light);
}
.collapse-btn{
  width: 36px; height: 36px; border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--surface); color: var(--text-dim); display: flex; align-items: center;
  justify-content: center; cursor: pointer; flex-shrink: 0;
  transition: all var(--dur-1) var(--ease);
}
.collapse-btn:hover{ background: var(--surface-hover); color: var(--text); border-color: var(--border-strong); }
.collapse-btn svg{ width: 16px; height: 16px; }

.new-chat-btn{
  height: 40px; margin: 14px 12px 8px; padding: 0 14px; border-radius: var(--radius-md);
  border: 1px solid var(--border); background: var(--surface-solid); color: var(--text);
  font-weight: 600; font-size: var(--fs-base); display: flex; align-items: center; gap: 10px; cursor: pointer;
  box-shadow: var(--shadow-xs);
  transition: all var(--dur-1) var(--ease);
}
.new-chat-btn:hover{ border-color: var(--accent); transform: translateY(-1px); box-shadow: var(--shadow-sm), 0 6px 18px -8px color-mix(in srgb, var(--accent) 45%, transparent); }
.new-chat-btn:active{ transform: translateY(0) scale(.98); }
.new-chat-btn svg{ width: 17px; height: 17px; color: var(--accent); }

.nav-section{ padding: 6px 12px; overflow-y: auto; flex: 1; }
.nav-group-title{
  font-size: 11px; text-transform: uppercase; letter-spacing: .09em; color: var(--text-faint);
  font-weight: 600; margin: 16px 12px 6px;
}
.nav-item{
  position: relative; display: flex; align-items: center; gap: 12px;
  height: 38px; padding: 0 12px; margin: 1px 0; user-select: none;
  border-radius: var(--radius-sm); color: var(--text-dim); font-size: var(--fs-base); font-weight: 500;
  cursor: pointer; white-space: nowrap; overflow: hidden;
  transition: background var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}
.nav-item svg{ width: 18px; height: 18px; flex-shrink: 0; }
.nav-item .label-text{ flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav-item:hover{ background: var(--surface-hover); color: var(--text); }
.nav-item.active, .nav-item[aria-current="true"]{
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  color: var(--text);
  box-shadow: inset 2px 0 0 var(--accent);
  font-weight: 600;
}

.nav-search{ position: relative; margin: 4px 0 8px; }
.nav-search svg{
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  width: 16px; height: 16px; color: var(--text-faint); pointer-events: none;
}
.search-input{
  height: 38px !important; padding: 0 14px 0 36px !important;
  font-size: var(--fs-base); border-radius: var(--radius-md);
  background: var(--surface);
  transition: border-color var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease);
}

/* chat history */
.chat-list{ margin-top: 4px; }
.chat-item{
  position: relative; display: flex; align-items: center; gap: 12px;
  height: 36px; padding: 0 12px; margin: 1px 0;
  border-radius: var(--radius-sm); font-size: 13.5px; color: var(--text-dim);
  cursor: pointer; transition: background var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}
.chat-item:hover{ background: var(--surface-hover); color: var(--text); }
.chat-item.active{
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  color: var(--text); box-shadow: inset 2px 0 0 var(--accent);
}
.chat-item-title{ flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chat-item-actions{ display: flex; gap: 4px; align-items: center; }
.chat-item-badge{ font-size: var(--fs-xs); }
.chat-item-del{
  width: 20px; height: 20px; border-radius: var(--radius-xs); border: none; background: transparent;
  color: var(--text-faint); cursor: pointer; display: flex; align-items: center; justify-content: center;
  font-size: var(--fs-xs); opacity: 0;
  transition: opacity var(--dur-1) var(--ease), background var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}
.chat-item:hover .chat-item-del{ opacity: 1; }
.chat-item-del:hover{ color: var(--danger); background: var(--surface-hover); }
.chat-item .chat-more{
  width: 24px; height: 24px; border-radius: var(--radius-xs); border: none; background: transparent;
  color: var(--text-faint); display: flex; align-items: center; justify-content: center;
  cursor: pointer; flex-shrink: 0; opacity: 0;
  transition: opacity var(--dur-1) var(--ease), background var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}
.chat-item:hover .chat-more{ opacity: 1; }
.chat-item .chat-more:hover{ color: var(--text); background: var(--surface-hover); }
.chat-item .chat-more svg{ width: 16px; height: 16px; }
.chat-item.pinned{ box-shadow: inset 3px 0 0 var(--accent); }
.chat-item .pin-dot{ width: 7px; height: 7px; border-radius: 50%; background: var(--accent); flex-shrink: 0; }

.history-group-title{
  font-size: 11px; text-transform: uppercase; letter-spacing: .09em; color: var(--text-faint);
  margin: 16px 12px 6px; font-weight: 700;
}
.history-actions{ display: flex; gap: 8px; padding: 6px 2px 10px; flex-wrap: wrap; }
.history-action{
  display: inline-flex; align-items: center; gap: 7px; padding: 6px 12px;
  font-size: var(--fs-sm); font-weight: 500; color: var(--text-dim);
  border: 1px solid var(--border); border-radius: var(--radius-full); background: transparent;
  cursor: pointer; transition: all var(--dur-1) var(--ease);
}
.history-action:hover{ color: var(--text); border-color: var(--accent); background: var(--surface-hover); }
.history-action svg{ width: 13px; height: 13px; }
.history-action .act-label{ white-space: nowrap; }

/* sidebar footer + user chip */
.sidebar-footer{ border-top: 1px solid var(--border); padding: 10px; position: relative; }
.user-chip{
  display: flex; align-items: center; gap: 12px; padding: 8px 10px;
  border-radius: var(--radius-md); cursor: pointer;
  transition: background var(--dur-1) var(--ease);
}
.user-chip:hover{ background: var(--surface-hover); }
.user-chip .chevron{ color: var(--text-faint); transition: transform var(--dur-2) var(--ease); flex-shrink: 0; width: 16px; height: 16px; }
.user-chip .who{ overflow: hidden; min-width: 0; }
.user-chip .name{ font-size: 13.5px; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-chip .email{ font-size: 12px; color: var(--text-faint); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* dropdowns */
.user-dropdown{
  position: absolute; bottom: calc(100% - 8px); left: 8px; right: 8px;
  background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 8px; z-index: 50;
  box-shadow: var(--shadow-lg);
  animation: ddIn 180ms var(--ease); transform-origin: bottom left;
}
.user-dropdown.show{ opacity: 1; pointer-events: all; }
.dropdown-item{
  display: flex; align-items: center; gap: 12px; padding: 10px 12px;
  border-radius: var(--radius-sm); color: var(--text-dim); font-size: var(--fs-base);
  cursor: pointer; transition: all var(--dur-1) var(--ease);
}
.dropdown-item:hover{ background: var(--surface-hover); color: var(--text); }
.dropdown-item svg{ width: 17px; height: 17px; flex-shrink: 0; }
.dropdown-item[data-logout]:hover{ color: var(--danger); }
.dropdown-divider{ height: 1px; background: var(--border-light); margin: 6px 0; }
.avatar{
  width: 34px; height: 34px; border-radius: 50%; flex-shrink: 0; object-fit: cover;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: var(--accent-contrast);
  display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 13px;
  border: 1px solid var(--border);
}
.dropdown-header{ display: flex; align-items: center; gap: 12px; padding: 12px 10px 14px; }
.dd-who{ min-width: 0; }
.dd-name{ font-size: var(--fs-md); font-weight: 700; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dd-email{ font-size: 12px; color: var(--text-faint); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-dropdown .dropdown-item{ position: relative; }
.user-dropdown .dropdown-item::before{
  content:""; position: absolute; left: 0; top: 8px; bottom: 8px; width: 2.5px; border-radius: 2px;
  background: var(--accent); opacity: 0; transition: opacity var(--dur-1) var(--ease);
}
.user-dropdown .dropdown-item:hover::before{ opacity: 1; }

/* context menu */
.chat-context{
  position: absolute; top: calc(100% + 4px); right: 8px; min-width: 190px; z-index: 40;
  background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg); padding: 6px;
  animation: popIn var(--dur-1) var(--ease); transform-origin: top right;
}
.chat-context.hidden{ display: none; }
.chat-context .ctx-item{
  display: flex; align-items: center; gap: 10px; width: 100%; padding: 10px 12px;
  font-size: var(--fs-base); border: none; background: transparent; color: var(--text-dim);
  border-radius: var(--radius-sm); cursor: pointer; text-align: left;
  transition: all var(--dur-1) var(--ease);
}
.chat-context .ctx-item:hover{ background: var(--surface-hover); color: var(--text); }
.chat-context .ctx-item.danger{ color: var(--danger); }
.chat-context .ctx-item.danger:hover{ background: color-mix(in srgb, var(--danger) 12%, transparent); }
.chat-context .ctx-item svg{ width: 15px; height: 15px; flex-shrink: 0; }

/* ============================== MAIN / TOPBAR ============================== */

.main{ flex: 1; display: flex; flex-direction: column; min-width: 0; position: relative; }
.topbar{
  position: relative; z-index: 30;
  height: 60px; flex-shrink: 0; display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; border-bottom: 1px solid var(--border);
}
.model-picker{
  display: flex; align-items: center; gap: 8px; height: 38px; padding: 0 16px;
  border-radius: var(--radius-md); border: 1px solid var(--border); background: var(--surface);
  cursor: pointer; font-size: var(--fs-base); font-weight: 600; color: var(--text);
  box-shadow: var(--shadow-xs);
  transition: all var(--dur-1) var(--ease);
}
.model-picker:hover{ border-color: var(--accent); background: var(--surface-hover); }
.model-picker:active{ transform: scale(.98); }
.model-picker svg{ width: 15px; height: 15px; color: var(--text-faint); }
.model-picker-wrap{ position:relative; }
.model-picker-menu{ position:absolute; top:calc(100% + 8px); left:0; min-width:310px; max-width:380px; padding:8px; background:var(--bg-elevated); border:1px solid var(--border); border-radius:14px; box-shadow:var(--shadow-lg); z-index:120; opacity:0; transform:translateY(-4px); pointer-events:none; transition:opacity .16s ease, transform .16s ease; backdrop-filter:blur(var(--blur-menu,0px)); }
.model-picker-menu.open{ opacity:1; transform:translateY(0); pointer-events:auto; }
.model-picker-heading{ padding:7px 9px 9px; font-size:13px; font-weight:700; color:var(--text); display:flex; justify-content:space-between; gap:12px; }
.model-picker-heading span{ color:var(--text-faint); font-size:10px; font-weight:500; }
.model-picker-subtitle{ padding:7px 9px 5px; color:var(--text-faint); font-size:10px; text-transform:uppercase; letter-spacing:.08em; }
.model-picker-item{ width:100%; border:0; background:transparent; color:var(--text); padding:10px 9px; border-radius:9px; display:flex; align-items:center; justify-content:space-between; text-align:left; cursor:pointer; }
.model-picker-item:hover,.model-picker-item.active{ background:var(--surface-hover); }
.model-picker-item span:first-child{ display:flex; flex-direction:column; gap:2px; min-width:0; }
.model-picker-item b{ font-size:13px; }
.model-picker-item small{ color:var(--text-faint); font-size:11px; }
.model-picker-check{ color:var(--accent); font-size:13px; }
.model-picker-add{ width:100%; margin-top:6px; border:1px dashed var(--border); background:transparent; color:var(--text-dim); border-radius:9px; padding:9px; cursor:pointer; text-align:left; }
.model-picker-add:hover{ background:var(--surface-hover); color:var(--text); }
.model-picker-provider-actions{ display:flex; align-items:center; gap:6px; }

.topbar-actions{ display: flex; gap: 6px; align-items: center; }
.icon-btn{
  width: 36px; height: 36px; border-radius: var(--radius-sm);
  border: 1px solid transparent; background: transparent;
  color: var(--text-dim); display: flex; align-items: center; justify-content: center; cursor: pointer;
  transition: all var(--dur-1) var(--ease);
}
.icon-btn:hover{ background: var(--surface-hover); color: var(--text); border-color: var(--border); }
.icon-btn:active{ transform: scale(.9); }
.icon-btn svg{ width: 18px; height: 18px; }

.topbar-btn{
  position: relative; width: 36px; height: 36px; border-radius: var(--radius-sm);
  border: 1px solid transparent; background: transparent; color: var(--text-dim);
  display: flex; align-items: center; justify-content: center; cursor: pointer;
  transition: all var(--dur-1) var(--ease);
}
.topbar-btn:hover, .topbar-btn.active{
  background: var(--surface-hover); color: var(--text); border-color: var(--border);
  transform: translateY(-1px);
}
.topbar-btn:active{ transform: translateY(0) scale(.92); }
.topbar-btn svg{ width: 19px; height: 19px; transition: transform var(--dur-1) var(--ease), color var(--dur-1) var(--ease); }
.topbar-btn:hover svg{ transform: scale(1.12); }
.topbar-btn:active svg{ transform: scale(.92); }
#theme-toggle svg{ transition: transform var(--dur-3) var(--ease); }
#theme-toggle:hover svg{ transform: rotate(180deg) scale(1.12); }

.notif-dot{
  position: absolute; top: 5px; right: 5px; width: 8px; height: 8px; border-radius: 50%;
  background: var(--danger); box-shadow: 0 0 0 2px var(--bg-elevated);
}
.notif-popover{
  position: absolute; top: calc(100% + 8px); right: 0; width: 340px; max-width: calc(100vw - 32px);
  background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  padding: 8px; z-index: 60; overflow: hidden;
  animation: popIn var(--dur-1) var(--ease); transform-origin: top right;
}
.notif-popover.hidden{ display: none; }
.notif-item{
  display: flex; align-items: flex-start; gap: 12px; padding: 12px 14px; border-radius: var(--radius-md);
  color: var(--text-dim); font-size: var(--fs-base); cursor: pointer;
  transition: background var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}
.notif-item:hover{ background: var(--surface-hover); color: var(--text); }
.notif-item .n-title{ font-weight: 600; font-size: 14px; color: var(--text); }
.notif-item .n-time{ font-size: var(--fs-xs); color: var(--text-faint); margin-top: 2px; }

.search-overlay{
  position: fixed; inset: 0; z-index: 250; padding-top: 100px;
  background: color-mix(in srgb, var(--bg) 55%, transparent);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  animation: fadeIn var(--dur-2) var(--ease);
}
.search-overlay.hidden{ display: none; }
.search-overlay .search-input{
  display: block; width: min(660px, calc(100vw - 40px)); margin: 0 auto;
  font-size: var(--fs-lg); height: 52px !important; padding: 0 20px 0 48px !important;
  border-radius: var(--radius-lg); background: var(--bg-elevated);
}
.search-results{ width: min(660px, calc(100vw - 40px)); margin: 16px auto 0; display: flex; flex-direction: column; gap: 8px; }
.search-result{
  display: block; padding: 14px 18px; border-radius: var(--radius-md); cursor: pointer;
  background: var(--surface); border: 1px solid var(--border); color: var(--text-dim);
  transition: all var(--dur-1) var(--ease);
}
.search-result:hover, .search-result.active{ background: var(--surface-hover); border-color: var(--accent); color: var(--text); }
.search-result .sr-title{ font-size: var(--fs-md); font-weight: 600; color: var(--text); }
.search-result .sr-sub{ font-size: var(--fs-sm); color: var(--text-faint); margin-top: 2px; }

/* ============================== VIEWS / PAGES ============================== */

.page-shell{ display: flex; height: 100vh; }
.page-main{ flex: 1; overflow-y: auto; }
.vertex-view{
  display: flex; flex-direction: column; flex: 1; min-height: 0;
  animation: fadeUp var(--dur-2) var(--ease);
}
#view-chat{ display: flex; }
.page-transition{ animation: fadeUp var(--dur-2) var(--ease); }
.page-header{ padding: 26px 32px 0; }
.page-header h1{ font-size: var(--fs-xl); }
.page-header p{ color: var(--text-dim); font-size: var(--fs-base); margin-top: 8px; }
.page-content{ padding: 24px 32px 64px; max-width: 900px; }

.tabs{ display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 24px; overflow-x: auto; }
.tab{
  padding: 11px 18px; font-size: var(--fs-base); font-weight: 600; color: var(--text-faint); cursor: pointer;
  border-bottom: 2px solid transparent; white-space: nowrap; background: none;
  border-top: none; border-left: none; border-right: none;
  transition: color var(--dur-1) var(--ease);
}
.tab:hover{ color: var(--text); }
.tab.active{ color: var(--text); border-color: var(--accent); }

/* ============================== BUTTONS ============================== */

.btn{
  height: 38px; padding: 0 18px; border-radius: var(--radius-md); border: 1px solid var(--border);
  cursor: pointer; font-weight: 600; font-size: var(--fs-base); display: inline-flex; align-items: center;
  gap: 8px; justify-content: center; background: var(--surface); color: var(--text); position: relative;
  transition: all var(--dur-1) var(--ease); white-space: nowrap;
}
.btn:hover{ border-color: var(--accent); }
.btn:active{ transform: translateY(1px) scale(.98); }
.btn::after{
  content:""; position: absolute; inset: 0; border-radius: inherit;
  background: currentColor; opacity: 0; transition: opacity var(--dur-1) var(--ease); pointer-events: none;
}
.btn:active::after{ opacity: .08; }
.btn svg{ width: 16px; height: 16px; }
.btn .spinner{ vertical-align: -2px; }
.btn-block{ width: 100%; justify-content: center; }
.btn-sm{ height: 32px; padding: 0 14px; font-size: var(--fs-sm); border-radius: var(--radius-sm); gap: 6px; }

.btn-primary{
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--accent-contrast); border: none;
  box-shadow: 0 1px 2px color-mix(in srgb, var(--accent) 30%, transparent);
}
.btn-primary:hover{ transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.btn-secondary{
  background: var(--surface-solid); border-color: var(--border); color: var(--text);
  box-shadow: var(--shadow-xs);
}
.btn-secondary:hover{ border-color: var(--accent); transform: translateY(-1px); }
.btn-ghost{ border-color: transparent; background: transparent; }
.btn-ghost:hover{ background: var(--surface-hover); }
.btn-danger{ color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, var(--border)); }
.btn-danger:hover{ background: color-mix(in srgb, var(--danger) 12%, transparent); transform: translateY(-1px); }
.btn-outline{ background: transparent; border-color: var(--border-strong); color: var(--text); }
.btn-outline:hover{ background: var(--surface-hover); border-color: var(--accent); }

/* ============================== FORMS / INPUTS ============================== */

.field{ margin-bottom: 18px; }
.field label{ display: block; font-size: 13.5px; font-weight: 600; color: var(--text-dim); margin-bottom: 8px; }
.input{
  width: 100%; height: 38px; padding: 0 14px; border-radius: var(--radius-md);
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  font-family: var(--font-body); font-size: var(--fs-base);
  transition: border-color var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease);
  outline: none;
}
textarea.input{ height: auto; min-height: 96px; padding: 12px 14px; line-height: 1.6; }
select.input{
  padding-right: 34px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none'%3E%3Cpath d='M6 9l6 6 6-6' stroke='%23999' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 11px center; background-size: 15px;
  appearance: none; -webkit-appearance: none; cursor: pointer;
}
.input::placeholder{ color: var(--text-faint); }
.input:focus{ border-color: var(--accent); box-shadow: var(--shadow-glow); }
.input:disabled{ opacity: .55; cursor: not-allowed; }

.hint{ font-size: var(--fs-sm); color: var(--text-faint); margin-top: 8px; }
.error-text{ font-size: 13px; color: var(--danger); margin-top: 8px; }
.checkbox-row{ display: flex; align-items: center; gap: 10px; font-size: var(--fs-base); color: var(--text-dim); }
.checkbox-row input{ accent-color: var(--accent); width: 16px; height: 16px; }
.input-group{ position: relative; }

/* ---- custom dropdown (hidden native select + visible trigger) ---- */
.v-select{
  position: relative; width: 210px; height: 38px; flex-shrink: 0;
  border-radius: var(--radius-md); border: 1px solid var(--border); background: var(--surface);
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 0 12px 0 14px; cursor: pointer; font-size: var(--fs-md);
  transition: border-color var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease), background var(--dur-1) var(--ease);
}
.v-select:hover{ background: var(--surface-hover); }
.v-select.focus{ border-color: var(--accent); box-shadow: var(--shadow-glow); background: var(--surface); }
.v-select select{
  position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0;
  cursor: pointer; border: none; appearance: none; -webkit-appearance: none; font-size: var(--fs-base);
}
.v-select-label{
  font-size: var(--fs-md); font-weight: 500; color: var(--text); pointer-events: none;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; min-width: 0;
}
.v-select-arrow{
  width: 16px; height: 16px; color: var(--text-faint); pointer-events: none; flex-shrink: 0;
  transition: transform var(--dur-1) var(--ease);
}
.v-select.focus .v-select-arrow{ transform: rotate(180deg); color: var(--accent); }

/* ---- segmented control ---- */
.segmented{
  display: flex; border: 1px solid var(--border); border-radius: var(--radius-md);
  overflow: hidden; background: var(--surface); flex-shrink: 0;
}
.segmented button{
  flex: 1; padding: 10px 14px; border: none; background: transparent; color: var(--text-dim);
  font-size: var(--fs-base); font-weight: 600; cursor: pointer;
  transition: all var(--dur-1) var(--ease);
}
.segmented button:hover{ color: var(--text); background: var(--surface-hover); }
.segmented button.active{
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: var(--radius-sm);
}

/* ---- toggle switch ---- */
.toggle{ position: relative; width: 44px; height: 24px; flex-shrink: 0; cursor: pointer; }
.toggle input{ position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.toggle .track{
  position: absolute; inset: 0; border-radius: var(--radius-full);
  background: var(--surface-hover); border: 1px solid var(--border);
  transition: background var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease);
}
.toggle .thumb{
  position: absolute; top: 3px; left: 3px; width: 18px; height: 18px; border-radius: 50%;
  background: var(--text-dim);
  transition: transform var(--dur-1) var(--ease), background var(--dur-1) var(--ease);
  box-shadow: 0 1px 2px rgba(0,0,0,.25);
}
.toggle input:checked + .track{ background: var(--accent); border-color: transparent; }
.toggle input:checked + .track + .thumb{ transform: translateX(20px); background: var(--accent-contrast); }
.toggle input:focus-visible + .track{ outline: 2px solid var(--accent); outline-offset: 2px; }

/* ============================== CARDS & GRIDS ============================== */

.card{
  border-radius: var(--radius-lg); padding: 20px;
  background: var(--surface-solid); border: 1px solid var(--border);
  box-shadow: var(--shadow-xs);
  transition: border-color var(--dur-2) var(--ease), transform var(--dur-2) var(--ease), box-shadow var(--dur-2) var(--ease);
}
.card:hover{ border-color: color-mix(in srgb, var(--accent) 30%, var(--border)); transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.card-danger{ border-color: color-mix(in srgb, var(--danger) 35%, var(--border)); }
.card-danger:hover{ border-color: var(--danger); box-shadow: var(--shadow-sm); }

.settings-row{
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 0; border-bottom: 1px solid var(--border); gap: 24px;
}
.settings-row:last-child{ border-bottom: none; }
.settings-row .info{ min-width: 0; }
.settings-row .info .t{ font-weight: 600; font-size: var(--fs-base); color: var(--text); }
.settings-row .info .s{ font-size: var(--fs-sm); color: var(--text-faint); margin-top: 4px; }
.settings-grid{ display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }

.prompt-grid{ display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 16px; }
.prompt-card{
  padding: 16px 18px; border-radius: var(--radius-lg); border: 1px solid var(--border);
  background: var(--surface-solid); cursor: pointer; position: relative;
  transition: all var(--dur-1) var(--ease); box-shadow: var(--shadow-xs);
}
.prompt-card:hover{
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
  transform: translateY(-2px); box-shadow: var(--shadow-sm);
}
.prompt-card-title{ font-weight: 600; font-size: var(--fs-md); margin-bottom: 8px; }
.prompt-card-content{
  font-size: var(--fs-base); color: var(--text-faint); line-height: 1.55;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.prompt-card-fav{ position: absolute; top: 10px; right: 10px; font-size: var(--fs-md); }
.prompt-card .fav{
  position: absolute; top: 10px; right: 10px; width: 28px; height: 28px; border: none; background: transparent;
  color: var(--text-faint); font-size: 16px; cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: all var(--dur-1) var(--ease);
}
.prompt-card .fav:hover{ color: var(--accent); transform: scale(1.15); }
.prompt-card .fav.active{ color: var(--accent); }
.prompt-card .p-cats{ display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }

.image-grid{ display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; }
.image-item{
  border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--border);
  position: relative; aspect-ratio: 1; background: var(--surface-solid);
}
.image-item img{ width: 100%; height: 100%; object-fit: cover; }
.image-item-overlay{
  position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,.75), transparent 55%);
  opacity: 0; transition: opacity var(--dur-1) var(--ease);
  display: flex; align-items: flex-end; padding: 12px; font-size: var(--fs-sm); color: #fff;
}
.image-item:hover .image-item-overlay{ opacity: 1; }

.file-grid{ display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; }
.file-card{
  display: flex; align-items: center; gap: 14px; padding: 16px; border-radius: var(--radius-lg);
  border: 1px solid var(--border); background: var(--surface-solid); transition: all var(--dur-1) var(--ease);
  cursor: pointer; box-shadow: var(--shadow-xs);
}
.file-card:hover{ border-color: color-mix(in srgb, var(--accent) 35%, var(--border)); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.file-card .fc-icon{
  width: 42px; height: 42px; border-radius: var(--radius-sm); flex-shrink: 0;
  background: color-mix(in srgb, var(--accent) 12%, var(--surface)); color: var(--accent);
  display: flex; align-items: center; justify-content: center; font-size: 16px;
}
.file-card .fc-name{ font-size: var(--fs-base); font-weight: 600; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-card .fc-size{ font-size: 12px; color: var(--text-faint); margin-top: 3px; }
.file-card .fc-actions{ display: flex; gap: 4px; margin-left: auto; opacity: 0; transition: opacity var(--dur-1) var(--ease); }
.file-card:hover .fc-actions{ opacity: 1; }

.model-list{ display: flex; flex-direction: column; gap: 14px; }
.model-card{
  display: flex; flex-direction: column; gap: 12px; padding: 18px 20px; border-radius: var(--radius-lg);
  border: 1px solid var(--border); background: var(--surface-solid); transition: all var(--dur-1) var(--ease);
  cursor: pointer; box-shadow: var(--shadow-xs);
}
.model-card:hover{ border-color: color-mix(in srgb, var(--accent) 35%, var(--border)); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.model-card.selected{ border-color: var(--accent); box-shadow: var(--shadow-glow); }
.model-card .mc-head{ display: flex; align-items: center; gap: 12px; }
.model-card .mc-name{ font-weight: 700; font-size: var(--fs-md); color: var(--text); }
.model-card .mc-provider{
  font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase;
  color: var(--accent); background: color-mix(in srgb, var(--accent) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); border-radius: var(--radius-full);
  padding: 4px 10px;
}
.model-card .mc-status{ width: 9px; height: 9px; border-radius: 50%; margin-left: auto; }
.model-card .mc-status.online{ background: var(--success); box-shadow: 0 0 0 3px color-mix(in srgb, var(--success) 22%, transparent); }
.model-card .mc-status.offline{ background: var(--text-faint); }
.model-card .mc-desc{ font-size: var(--fs-base); color: var(--text-dim); line-height: 1.6; }
.model-card .mc-caps{ display: flex; flex-wrap: wrap; gap: 8px; }
.model-card .cap-chip{
  font-size: var(--fs-xs); font-weight: 600; color: var(--text-dim); background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius-full); padding: 4px 10px;
}
.model-card .mc-meta{ font-size: var(--fs-sm); color: var(--text-faint); font-family: var(--font-mono); }

.key-row{
  display: flex; align-items: center; gap: 14px; padding: 14px 18px;
  border-radius: var(--radius-md); border: 1px solid var(--border); margin-bottom: 12px;
  background: var(--surface); transition: border-color var(--dur-1) var(--ease);
}
.key-row:hover{ border-color: var(--border-strong); }
.provider-group{
  padding: 14px 16px; border: 1px solid var(--border); border-radius: var(--radius-md);
  margin-bottom: 12px; background: var(--surface);
}
.provider-label{ font-weight: 600; font-size: var(--fs-md); margin-bottom: 6px; }
.model-option{ font-size: var(--fs-base); color: var(--text-dim); font-family: var(--font-mono); }

.memory-item{
  display: flex; align-items: center; gap: 14px; padding: 14px 18px;
  border-radius: var(--radius-md); border: 1px solid var(--border); margin-bottom: 12px; background: var(--surface);
}
.memory-item .m-text{ flex: 1; font-size: var(--fs-base); color: var(--text-dim); }
.memory-item .m-pin{
  width: 30px; height: 30px; border-radius: var(--radius-xs); border: none; background: transparent;
  color: var(--text-faint); display: flex; align-items: center; justify-content: center;
  cursor: pointer; flex-shrink: 0; transition: all var(--dur-1) var(--ease);
}
.memory-item .m-pin:hover{ color: var(--accent); }
.memory-item .m-pin.active{ color: var(--accent); }
.memory-item .m-pin svg{ width: 15px; height: 15px; }
.memory-item .m-actions{ display: flex; gap: 4px; }

.tag{
  display: inline-flex; align-items: center; font-size: var(--fs-xs); font-weight: 600;
  color: var(--text-dim); background: var(--surface-solid); border: 1px solid var(--border);
  border-radius: var(--radius-full); padding: 4px 10px;
}

/* ============================== CHAT ============================== */

.chat-scroll{ flex: 1; overflow-y: auto; padding: 24px 0 12px; }
.chat-header{
  display: flex; justify-content: center; padding: 14px 0 4px; flex-shrink: 0;
  animation: fadeUp var(--dur-2) var(--ease);
}

.msg{ display: flex; gap: 12px; padding: 6px 24px; margin: 8px 0; position: relative; animation: fadeUp .22s var(--ease); }
.msg-in{ animation: msgIn var(--dur-3) var(--ease); }
.msg.user{ justify-content: flex-end; }
.msg.assistant{ justify-content: flex-start; }
.msg .msg-row{ display: flex; flex-direction: column; gap: 6px; min-width: 0; max-width: 85%; }
.msg.user .msg-row{ align-items: flex-end; }
.msg .msg-avatar{
  width: 36px; height: 36px; border-radius: 50%; flex-shrink: 0; margin-top: 2px;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700;
}
.msg.user .msg-avatar{ background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: var(--accent-contrast); }
.msg.assistant .msg-avatar{ background: var(--surface-solid); border: 1px solid var(--border); color: var(--accent); }

.msg-bubble{
  max-width: 76%; border-radius: var(--radius-lg);
  padding: 14px 18px; font-size: var(--fs-md); line-height: 1.65;
}
.msg.assistant .msg-bubble{
  background: var(--surface-solid); border: 1px solid var(--border);
  border-top-left-radius: var(--radius-xs);
  box-shadow: var(--shadow-xs);
}
.msg.user .msg-bubble{
  background: color-mix(in srgb, var(--accent) 13%, var(--surface-solid));
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--border));
  border-top-right-radius: var(--radius-xs);
  box-shadow: 0 8px 20px -14px color-mix(in srgb, var(--accent) 50%, transparent);
}
.msg.error .msg-bubble{
  background: color-mix(in srgb, var(--danger) 10%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--danger) 35%, var(--border)); color: var(--text);
}
.msg.error .msg-bubble::before{ content: "⚠ "; color: var(--danger); }

.msg-time{ font-size: var(--fs-xs); color: var(--text-faint); margin-top: 8px; opacity: .7; }
.msg-actions{ display: flex; gap: 4px; opacity: 0; transition: opacity var(--dur-1) var(--ease); }
.msg:hover .msg-actions{ opacity: 1; }
.act-btn{
  width: 28px; height: 28px; border-radius: var(--radius-xs); border: none; background: transparent;
  color: var(--text-faint); display: flex; align-items: center; justify-content: center; cursor: pointer;
  transition: all var(--dur-1) var(--ease);
}
.act-btn:hover{ color: var(--text); background: var(--surface-hover); }
.act-btn svg{ width: 15px; height: 15px; }

.stream-caret{
  display: inline-block; width: 9px; height: 17px; margin-left: 2px; vertical-align: -2px;
  background: var(--accent); animation: blink 1s steps(2, start) infinite; border-radius: 2px;
}
.streaming-msg .msg-bubble{ border-color: color-mix(in srgb, var(--accent) 35%, var(--border)); }
.msg-edit{
  width: 100%; min-height: 96px; font-family: var(--font-mono);
  font-size: var(--fs-md); line-height: 1.6; resize: vertical;
}
.msg-edit-bar{ display: flex; gap: 10px; justify-content: flex-end; margin-top: 10px; }
.typing-indicator{ display: inline-flex; align-items: center; gap: 5px; color: var(--text-faint); font-style: italic; font-size: var(--fs-md); }
.typing-indicator::after{ content: "…"; animation: typingDots 1.2s infinite; }
.typing-indicator .dot{
  width: 7px; height: 7px; border-radius: 50%; background: var(--text-faint);
  animation: bounceDots 1.2s infinite ease-in-out;
}
.typing-indicator .dot:nth-child(2){ animation-delay: .15s; }
.typing-indicator .dot:nth-child(3){ animation-delay: .3s; }

/* markdown inside bubbles */
.msg-bubble p{ margin: 0 0 12px; }
.msg-bubble p:last-child{ margin-bottom: 0; }
.msg-bubble ul, .msg-bubble ol{ margin: 8px 0 12px; padding-left: 24px; }
.msg-bubble h1,.msg-bubble h2,.msg-bubble h3{ margin: 14px 0 10px; font-size: var(--fs-lg); }
.msg-bubble a{ color: var(--accent); text-decoration: underline; }
.msg-bubble :not(pre) code{
  background: var(--surface-hover) !important;
  border-radius: 5px; padding: 2px 6px;
  font-family: var(--font-mono); font-size: var(--fs-sm); color: var(--text-dim);
}

.error-bar{
  padding: 12px 24px; background: color-mix(in srgb, var(--danger) 15%, transparent);
  border-top: 1px solid color-mix(in srgb, var(--danger) 30%, transparent);
  color: var(--danger); font-size: var(--fs-base); text-align: center;
}

/* ---- welcome / empty-chat hero ---- */
.welcome-screen{
  flex: 1; min-height: 0; overflow-y: auto;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 32px 32px 44px;
}
.welcome-logo{ margin-bottom: 24px; animation: fadeUp var(--dur-3) var(--ease); }
.welcome-logo img{ width: 72px; height: 72px; filter: drop-shadow(0 12px 30px color-mix(in srgb, var(--accent) 22%, transparent)); }
.welcome-heading{ animation: fadeUp var(--dur-3) var(--ease) .05s both; }
.welcome-hi{ display: block; font-size: clamp(16px, 2vw, 19px); color: var(--text-dim); margin-bottom: 6px; }
.welcome-heading h1{ font-size: clamp(30px, 4.2vw, 48px); font-weight: 600; letter-spacing: -.03em; }
.suggestion-grid{
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px;
  width: min(100%, 900px); margin-top: 40px;
}
.suggestion-card{
  font-family: inherit; text-align: left; cursor: pointer;
  display: flex; flex-direction: column; gap: 10px;
  padding: 18px 20px 16px; border-radius: var(--radius-lg);
  border: 1px solid var(--border); background: var(--surface);
  backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  color: var(--text); transition: all var(--dur-2) var(--ease); box-shadow: var(--shadow-xs);
}
.suggestion-card svg{ width: 24px; height: 24px; color: var(--accent); transition: transform var(--dur-1) var(--ease); }
.suggestion-card:nth-child(1){ animation: fadeUp var(--dur-3) var(--ease) .04s both; }
.suggestion-card:nth-child(2){ animation: fadeUp var(--dur-3) var(--ease) .08s both; }
.suggestion-card:nth-child(3){ animation: fadeUp var(--dur-3) var(--ease) .12s both; }
.suggestion-card:nth-child(4){ animation: fadeUp var(--dur-3) var(--ease) .16s both; }
.suggestion-card:hover{
  transform: translateY(-3px); border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  background: var(--surface-solid); box-shadow: var(--shadow-md);
}
.suggestion-card:hover svg{ transform: scale(1.12) rotate(-4deg); }
.suggestion-title{ font-size: var(--fs-base); font-weight: 600; color: var(--text); }
.suggestion-text{ font-size: 13px; line-height: 1.55; color: var(--text-faint); }

/* ============================== COMPOSER ============================== */

.composer-wrap{
  padding: 12px 24px 20px; position: relative; z-index: 10;
  background: linear-gradient(to top, color-mix(in srgb, var(--bg) 92%, transparent), transparent);
}
.composer{
  max-width: 800px; margin: 0 auto; border-radius: var(--radius-xl);
  padding: 10px 12px 10px 18px; display: flex; align-items: flex-end; gap: 12px;
  background: color-mix(in srgb, var(--bg-elevated) 82%, transparent);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border: 1px solid var(--border); box-shadow: var(--shadow-md);
  transition: border-color var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease);
  position: relative; isolation: isolate;
}
.composer:focus-within{
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  box-shadow: var(--shadow-glow), var(--shadow-md);
}
.composer textarea{
  flex: 1; border: none; background: transparent; color: var(--text);
  font-family: var(--font-body); font-size: var(--fs-md); line-height: 1.6;
  resize: none; min-height: 26px; max-height: 220px; padding: 10px 0; outline: none;
}
.composer textarea::placeholder{ color: var(--text-faint); font-size: var(--fs-md); }
.composer-actions{ display: flex; align-items: center; gap: 8px; padding-bottom: 4px; }
.composer-toolbar{ display: flex; align-items: center; gap: 8px; padding: 6px 8px 0; }
.composer-toolbar .icon-btn{ width: 38px; height: 38px; }
.composer-toolbar .composer-hint{ margin: 0 0 0 auto; }
.composer-hint{ font-size: 12px; color: var(--text-faint); }

.send-btn{
  width: 44px; height: 44px; border-radius: 50%; border: none; cursor: pointer;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: var(--accent-contrast);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
  transition: all var(--dur-1) var(--ease);
}
.send-btn:hover{ transform: scale(1.05); box-shadow: 0 4px 14px -4px color-mix(in srgb, var(--accent) 55%, transparent); }
.send-btn:disabled{ opacity: .4; cursor: not-allowed; transform: none; filter: saturate(.6); }
.send-btn svg{ width: 19px; height: 19px; }

.stop-btn{
  display: inline-flex; align-items: center; gap: 10px; padding: 10px 18px;
  font-size: var(--fs-base); font-weight: 600; color: var(--danger);
  background: var(--surface-solid); border: 1px solid color-mix(in srgb, var(--danger) 45%, var(--border));
  border-radius: var(--radius-full); cursor: pointer;
  transition: all var(--dur-1) var(--ease);
}
.stop-btn:hover{ background: color-mix(in srgb, var(--danger) 12%, transparent); transform: translateY(-1px); }
.stop-btn svg{ width: 15px; height: 15px; }

.attach-chips{ display: flex; flex-wrap: wrap; gap: 8px; padding: 0 18px; }
.attach-chip{
  display: inline-flex; align-items: center; gap: 8px; padding: 6px 10px 6px 13px;
  font-size: var(--fs-sm); font-weight: 500; color: var(--text-dim);
  background: var(--surface-solid); border: 1px solid var(--border);
  border-radius: var(--radius-full); animation: popIn var(--dur-1) var(--ease);
}
.attach-chip .ac-name{ max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.attach-chip .ac-x{
  width: 18px; height: 18px; border-radius: 50%; border: none;
  background: var(--surface-hover); color: var(--text-faint);
  display: flex; align-items: center; justify-content: center; font-size: 11px; cursor: pointer; line-height: 1;
  transition: all var(--dur-1) var(--ease);
}
.attach-chip .ac-x:hover{ background: var(--danger); color: #fff; }

.drag-overlay{
  position: fixed; inset: 0; z-index: 350; display: flex; align-items: center; justify-content: center;
  background: color-mix(in srgb, var(--bg) 70%, transparent); backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.drag-overlay.hidden{ display: none; }
.drag-overlay.dragging{
  background: color-mix(in srgb, var(--accent) 8%, color-mix(in srgb, var(--bg) 70%, transparent));
}
.drag-overlay .drag-inner{
  display: flex; flex-direction: column; align-items: center; gap: 14px; padding: 44px 64px;
  border: 2px dashed color-mix(in srgb, var(--accent) 55%, transparent); border-radius: var(--radius-xl);
  color: var(--text-dim); font-size: 16px; font-weight: 600; background: var(--surface-solid);
}
.drag-overlay .drag-inner svg{ width: 38px; height: 38px; color: var(--accent); }

.app-footer{ text-align: center; font-size: var(--fs-xs); color: var(--text-faint); margin-top: 10px; }
.app-footer a{ color: var(--accent); }
.app-footer a:hover{ text-decoration: underline; }

/* ============================== MODALS ============================== */

.modal-overlay{
  position: fixed; inset: 0; background: var(--layer); backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center; z-index: 200;
  animation: fadeIn var(--dur-2) var(--ease);
}
.modal{
  width: 520px; max-width: calc(100vw - 32px); border-radius: var(--radius-xl); padding: 28px;
  background: var(--bg-elevated); border: 1px solid var(--border);
  box-shadow: var(--shadow-lg); max-height: 88vh; overflow-y: auto;
  animation: modalIn .22s var(--ease); transform-origin: center;
}
.modal-header{ display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.modal-header h3{ font-size: var(--fs-lg); }
.modal-close{
  width: 34px; height: 34px; border-radius: var(--radius-sm); border: none;
  background: var(--surface-hover); color: var(--text-dim); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--dur-1) var(--ease);
}
.modal-close:hover{ color: var(--text); background: var(--surface-solid); transform: scale(1.05); }

.settings-modal-overlay{
  position: fixed; inset: 0; z-index: 320; display: flex; align-items: center; justify-content: center;
  background: var(--layer); backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  animation: fadeIn var(--dur-2) var(--ease);
}
.settings-modal-overlay.hidden{ display: none; }
.settings-modal{
  width: min(96vw, 1000px); height: min(92vh, 680px); display: flex; flex-direction: column;
  background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg); overflow: hidden;
  backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  animation: modalIn var(--dur-3) var(--ease); transform-origin: center;
}
.settings-modal.closing{ animation: modalOut .2s var(--ease) forwards; }
.settings-modal .sm-header{
  display: flex; align-items: center; justify-content: space-between;
  height: 60px; min-height: 60px; padding: 0 24px;
  border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.settings-modal .sm-header h3{ font-size: var(--fs-lg); }
.settings-modal .sm-body{ display: flex; flex: 1; min-height: 0; }
.settings-modal .sm-nav{
  width: 240px; flex-shrink: 0; border-right: 1px solid var(--border);
  overflow-y: auto; padding: 14px 10px;
}
.settings-modal .sm-nav-group{
  font-size: 11px; text-transform: uppercase; letter-spacing: .09em; color: var(--text-faint);
  padding: 14px 12px 6px; font-weight: 700;
}
.settings-modal .sm-nav-item{
  display: flex; align-items: center; gap: 12px; height: 38px; padding: 0 12px; margin: 1px 0;
  border-radius: var(--radius-sm); color: var(--text-dim); font-size: var(--fs-base); font-weight: 500;
  cursor: pointer; border: none; background: none; width: 100%; text-align: left;
  transition: all var(--dur-1) var(--ease);
}
.settings-modal .sm-nav-item svg{ width: 17px; height: 17px; flex-shrink: 0; }
.settings-modal .sm-nav-item:hover{ background: var(--surface-hover); color: var(--text); }
.settings-modal .sm-nav-item.active{
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  color: var(--text); box-shadow: inset 2px 0 0 var(--accent); font-weight: 600;
}
.settings-modal .sm-content{ flex: 1; overflow-y: auto; padding: 26px 32px 48px; }

/* ============================== SETTINGS COMPONENTS ============================== */

.section-title{ font-size: var(--fs-xl); font-weight: 600; margin: 2px 0 6px; font-family: var(--font-display); }
.section-sub{ font-size: var(--fs-base); color: var(--text-faint); margin-bottom: 24px; line-height: 1.6; }
.section-head{ display: flex; align-items: center; gap: 12px; }
.section-icon{
  display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0;
  width: 32px; height: 32px; border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--accent) 13%, transparent); color: var(--accent);
}
.section-icon svg{ width: 17px; height: 17px; }

.settings-nav{
  display: flex; align-items: center; gap: 12px; height: 38px; padding: 0 12px; margin: 1px 0;
  border-radius: var(--radius-sm); color: var(--text-dim); font-size: var(--fs-base); font-weight: 500;
  cursor: pointer; transition: background var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}
.settings-nav svg{ width: 18px; height: 18px; flex-shrink: 0; }
.settings-nav:hover{ background: var(--surface-hover); color: var(--text); }
.settings-nav.active{
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  color: var(--text); box-shadow: inset 2px 0 0 var(--accent); font-weight: 600;
}
.settings-nav .badge{ margin-left: auto; }

/* ---- theme picker: swatch grid + UI-mock cards ---- */
.theme-swatch-grid{
  display: grid !important; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 16px; padding-bottom: 8px;
}
.theme-swatch{ transition: transform var(--dur-2) var(--ease), box-shadow var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease); }
.theme-swatch:hover{ transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.theme-swatch.selected{ box-shadow: var(--shadow-glow), var(--shadow-sm); }

.theme-card{
  position: relative; display: flex; flex-direction: column; gap: 12px;
  padding: 14px; border-radius: var(--radius-lg);
  border: 1px solid var(--border); background: var(--surface-solid);
  cursor: pointer; text-align: left; font-family: var(--font-body); user-select: none;
  transition: transform var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease), box-shadow var(--dur-2) var(--ease);
}
.theme-card:hover{
  transform: translateY(-3px); border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
  box-shadow: var(--shadow-lg);
}
.theme-card.selected, .theme-card.active{
  border-color: var(--accent); box-shadow: var(--shadow-glow), var(--shadow-sm);
}
.theme-card-preview{
  position: relative; height: 92px; border-radius: var(--radius-md);
  overflow: hidden; border: 1px solid var(--border);
  background: var(--bg); box-shadow: var(--shadow-xs);
}
.theme-card-name{
  font-size: var(--fs-base); font-weight: 600; color: var(--text);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  padding-right: 22px;
}
.theme-card-check{
  position: absolute; top: 10px; right: 10px; z-index: 3;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--accent); color: var(--accent-contrast);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; line-height: 1;
  opacity: 0; transform: scale(.4);
  transition: transform var(--dur-2) var(--ease), opacity var(--dur-2) var(--ease);
  box-shadow: 0 2px 6px color-mix(in srgb, var(--accent) 40%, transparent);
}
.theme-card.selected .theme-card-check,
.theme-card.active .theme-card-check{ opacity: 1; transform: scale(1); }

/* UI-mock preview parts (Agent C emits; inline palette colors override bg) */
.tc-sidebar{
  position: absolute; top: 0; bottom: 0; left: 0; width: 24%;
  background: color-mix(in srgb, var(--surface-hover) 60%, var(--bg));
  border-right: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
}
.tc-main{
  position: absolute; top: 0; right: 0; bottom: 0; left: 24%;
  display: flex; flex-direction: column; gap: 5px; padding: 8px;
  background: color-mix(in srgb, var(--surface-solid) 45%, var(--bg));
}
.tc-bar{
  width: 44%; height: 6px; border-radius: 3px;
  background: color-mix(in srgb, var(--text-faint) 35%, transparent);
}
.tc-msg{ width: 62%; height: 11px; border-radius: 4px; background: color-mix(in srgb, var(--text-faint) 20%, transparent); }
.tc-msg-a{ align-self: flex-start; }
.tc-msg-u{ align-self: flex-end; width: 46%; background: color-mix(in srgb, var(--accent) 35%, transparent); }
.tc-accent{
  position: absolute; bottom: 7px; left: 7px; z-index: 2;
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 0 2px color-mix(in srgb, var(--bg) 60%, transparent);
}

/* legacy server-rendered theme cards (preview parts) */
.theme-card-preview .theme-preview-window{
  position: absolute; top: 12px; right: 12px; left: 34%; height: 54%;
  border-radius: var(--radius-sm); border: 1px solid; display: flex;
  flex-direction: column; justify-content: center; gap: 5px; padding: 8px 10px;
}
.theme-preview-window .theme-preview-dot{ width: 8px; height: 8px; border-radius: 50%; }
.theme-preview-window .theme-preview-bar{ display: block; height: 6px; border-radius: 3px; }
.theme-card-preview .theme-preview-accent{
  position: absolute; bottom: 7px; left: 7px; width: 11px; height: 11px; border-radius: 50%;
}
.theme-card .theme-apply-btn{ margin-top: auto; align-self: flex-end; }

/* theme tiles (alternate picker) */
.theme-grid{ display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 16px; }
.theme-tile{
  padding: 14px; border-radius: var(--radius-lg); border: 1px solid var(--border);
  background: var(--surface-solid); cursor: pointer; transition: all var(--dur-1) var(--ease);
  display: flex; flex-direction: column; gap: 12px; box-shadow: var(--shadow-xs);
}
.theme-tile:hover{
  transform: translateY(-3px); border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
  box-shadow: var(--shadow-md);
}
.theme-tile.selected{ border-color: var(--accent); box-shadow: var(--shadow-glow); }
.theme-tile .theme-preview{
  height: 72px; border-radius: var(--radius-md); border: 1px solid var(--border);
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--theme-a, var(--accent)), var(--theme-b, var(--accent-2)));
}
.theme-tile .theme-name{ font-size: var(--fs-base); font-weight: 600; color: var(--text); }
.theme-tile .theme-actions{ display: flex; gap: 6px; }
.theme-tile .tbtn{
  width: 30px; height: 30px; border-radius: var(--radius-xs); border: 1px solid var(--border);
  background: transparent; color: var(--text-faint); display: flex; align-items: center;
  justify-content: center; cursor: pointer; font-size: var(--fs-sm); line-height: 1;
  transition: all var(--dur-1) var(--ease);
}
.theme-tile .tbtn:hover{ color: var(--text); background: var(--surface-hover); border-color: var(--accent); }
.theme-tile .tbtn.danger:hover{ color: var(--danger); border-color: var(--danger); }
.theme-tile .tbtn svg{ width: 14px; height: 14px; }

/* theme editor */
.theme-editor{ display: flex; flex-direction: column; gap: 8px; }
.theme-color-grid{ display: flex; gap: 14px; flex-wrap: wrap; }
.theme-color-grid .field{ flex: 1; min-width: 130px; }
.theme-color-grid input[type="color"]{
  width: 100%; height: 42px; border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--surface-solid); padding: 4px; cursor: pointer;
}
.theme-preview{
  height: 92px; border-radius: var(--radius-md); border: 1px solid var(--border);
  position: relative; overflow: hidden; margin-bottom: 6px;
  transition: border-color var(--dur-1) var(--ease);
}
.theme-preview-accent{ position: absolute; top: 16px; left: 16px; width: 16px; height: 16px; border-radius: 50%; }
.theme-preview-bar{ position: absolute; top: 17px; left: 42px; right: 16px; height: 13px; border-radius: 6px; }
.theme-preview-bar-alt{ position: absolute; top: 37px; left: 42px; right: 16px; height: 9px; border-radius: 5px; opacity: .55; }
.theme-preview-text{ position: absolute; left: 16px; bottom: 15px; font-size: var(--fs-xl); font-weight: 700; font-family: var(--font-display); }

/* storage / memory / shortcuts / avatar */
.storage-bar-wrap{ margin-top: 14px; }
.storage-bar{
  height: 12px; border-radius: var(--radius-full);
  background: var(--surface-solid); border: 1px solid var(--border); overflow: hidden;
}
.storage-bar-fill{
  height: 100%; border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width .5s var(--ease);
}
.storage-nums{ display: flex; justify-content: space-between; font-size: var(--fs-sm); color: var(--text-dim); margin-top: 10px; }
.memory-stats{ display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 16px; }
.memory-stat-chip{
  display: inline-flex; align-items: center; gap: 8px; font-size: var(--fs-sm); font-weight: 600;
  color: var(--text-dim); background: var(--surface-solid); border: 1px solid var(--border);
  border-radius: var(--radius-full); padding: 8px 14px;
}
.memory-stat-value{ font-weight: 700; color: var(--accent); font-family: var(--font-mono); }
.shortcut-table{ display: flex; flex-direction: column; }
.shortcut-row{
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px 0; border-bottom: 1px solid var(--border);
}
.shortcut-row:last-child{ border-bottom: none; }
.shortcut-action{ font-size: var(--fs-base); color: var(--text-dim); }
.shortcut-key{
  font-family: var(--font-mono); font-size: var(--fs-sm); color: var(--text);
  background: var(--surface-solid); border: 1px solid var(--border); border-radius: var(--radius-xs);
  padding: 6px 12px; box-shadow: 0 2px 0 var(--border);
}
.prof-avatar-preview{
  width: 84px; height: 84px; border-radius: 50%; object-fit: cover;
  border: 1px solid var(--border); background: var(--surface-solid); color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 30px; font-weight: 700; overflow: hidden; flex-shrink: 0;
}

/* badges */
.badge{
  flex-shrink: 0; display: inline-flex; align-items: center; justify-content: center;
  font-size: 10.5px; font-weight: 700; letter-spacing: .06em; line-height: 1;
  padding: 4px 8px; border-radius: var(--radius-full); text-transform: uppercase;
}
.badge-soon{
  color: var(--accent); background: color-mix(in srgb, var(--accent) 16%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 34%, transparent);
}
.badge-coming-soon{
  color: var(--text-dim); background: var(--surface); border: 1px solid var(--border);
}
.nav-item.disabled{ opacity: .45; cursor: not-allowed; }
.nav-item.disabled:hover{ background: transparent; color: var(--text-dim); }
.badge-exp{
  color: var(--warning); background: var(--warning-soft); border: 1px solid var(--warning-border);
}
.badge-long{
  color: var(--accent); background: color-mix(in srgb, var(--accent) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}
.badge-short{
  color: var(--text-dim); background: var(--surface); border: 1px solid var(--border);
}
.badge-pinned{
  color: var(--warning); background: color-mix(in srgb, var(--warning) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--warning) 30%, transparent);
}

/* ============================== CODE BLOCKS ============================== */

.md-code-block{
  position: relative; border-radius: var(--radius-lg);
  border: 1px solid var(--border); overflow: hidden;
  background: var(--code-bg) !important;
  margin: 12px 0; font-size: 13.5px; line-height: 1.65;
}
.md-code-head{
  position: relative; display: flex; align-items: center; gap: 10px;
  height: 38px; padding: 0 12px 0 14px;
  background: var(--code-head-bg) !important;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 60%, transparent);
}
.md-code-lang{
  flex: 1; font-family: var(--font-mono); font-size: var(--fs-xs); font-weight: 600;
  text-transform: uppercase; letter-spacing: .08em; color: var(--text-dim);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.md-code-icon{
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; flex: 0 0 26px;
}
.md-code-icon svg,
.md-code-icon i{
  width: 24px; height: 24px; display: block;
}
.md-code-icon .devicon-html5-plain,
.md-code-icon .devicon-css3-plain,
.md-code-icon .devicon-javascript-plain,
.md-code-icon .devicon-python-plain,
.md-code-icon .devicon-typescript-plain,
.md-code-icon .devicon-json-plain,
.md-code-icon .devicon-php-plain,
.md-code-icon .devicon-java-plain,
.md-code-icon .devicon-c-plain,
.md-code-icon .devicon-cplusplus-plain,
.md-code-icon .devicon-csharp-plain,
.md-code-icon .devicon-mysql-plain,
.md-code-icon .devicon-go-plain,
.md-code-icon .devicon-rust-plain,
.md-code-icon .devicon-ruby-plain,
.md-code-icon .devicon-bash-plain,
.md-code-icon .devicon-yaml-plain{
  font-size: 24px; line-height: 1;
}
.md-code-block pre{
  margin: 0; padding: 14px 16px; overflow: auto;
  font-family: var(--font-mono); font-size: 13.5px; line-height: 1.65;
  color: var(--text-dim) !important;
}
.md-code-block pre code{ font-family: var(--font-mono); font-size: 13.5px; color: var(--text-dim) !important; background: transparent !important; padding: 0; }
.code-copy, .code-dl{
  position: relative; top: auto; right: auto;
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; padding: 0;
  font-size: var(--fs-xs); color: var(--text-dim);
  background: color-mix(in srgb, var(--code-bg) 70%, var(--surface-solid));
  border: 1px solid var(--border); border-radius: var(--radius-xs); cursor: pointer;
  opacity: .8; transition: all var(--dur-1) var(--ease);
}
.md-code-block:hover .code-copy, .md-code-block:hover .code-dl{ opacity: 1; }
.code-copy:hover, .code-dl:hover{ color: var(--text); background: var(--surface-hover); border-color: var(--accent); }

/* Syntax highlighting tokens for code blocks */
.md-code-block pre code .vx-tok{ color: inherit; }
.md-code-block pre code .vx-tok-keyword{ color: #c678dd !important; font-weight: 600; }
.md-code-block pre code .vx-tok-string{ color: #98c379 !important; }
.md-code-block pre code .vx-tok-number{ color: #d19a66 !important; }
.md-code-block pre code .vx-tok-comment{ color: #7f848e !important; font-style: italic; }
.md-code-block pre code .vx-tok-plain{ color: var(--text) !important; }
html[data-theme="light"] .md-code-block pre code .vx-tok-keyword{ color: #a626a4 !important; }
html[data-theme="light"] .md-code-block pre code .vx-tok-string{ color: #50a14f !important; }
html[data-theme="light"] .md-code-block pre code .vx-tok-number{ color: #986801 !important; }
html[data-theme="light"] .md-code-block pre code .vx-tok-comment{ color: #a0a1a7 !important; }
html[data-theme="light"] .md-code-block pre code .vx-tok-plain{ color: var(--text) !important; }

/* ============================== MISC ============================== */

.v-mono{ font-family: var(--font-mono); }
.empty-state{
  text-align: center; padding: 52px 24px; color: var(--text-faint); font-size: var(--fs-base);
  display: flex; flex-direction: column; align-items: center; gap: 12px;
}
.empty-state svg{ width: 38px; height: 38px; opacity: .5; }

.spinner{
  width: 18px; height: 18px; border-radius: 50%; flex-shrink: 0;
  border: 2px solid var(--border); border-top-color: var(--accent);
  animation: spin .7s linear infinite;
}
.skeleton{
  background: linear-gradient(90deg, var(--surface) 25%, var(--surface-hover) 50%, var(--surface) 75%);
  background-size: 200% 100%; animation: shimmer 1.4s infinite; border-radius: var(--radius-sm);
}

.toast-root{
  position: fixed; left: 50%; bottom: 30px; transform: translateX(-50%); z-index: 400;
  display: flex; flex-direction: column; align-items: center; gap: 10px; pointer-events: none;
}
.toast{
  background: var(--surface-solid); color: var(--text); border: 1px solid var(--border);
  padding: 12px 18px; border-radius: var(--radius-md); font-size: var(--fs-base); font-weight: 500;
  box-shadow: var(--shadow-md); opacity: 0; transform: translateY(10px);
  transition: opacity .22s var(--ease), transform .22s var(--ease);
}
.toast.show{ opacity: 1; transform: translateY(0); }

/* auth */
.auth-shell{ height: 100vh; width: 100vw; display: flex; align-items: center; justify-content: center; position: relative; z-index: 1; }
.auth-card{
  width: 420px; max-width: calc(100vw - 32px); border-radius: var(--radius-2xl); padding: 40px 32px;
  background: var(--bg-elevated); box-shadow: var(--shadow-lg);
}
.auth-card .vertex-logo{ justify-content: center; margin-bottom: 26px; }
.auth-card .vertex-logo .wordmark{ font-size: var(--fs-xl); }
.auth-card h1{ font-size: var(--fs-xl); text-align: center; margin-bottom: 8px; }
.auth-card .sub{ text-align: center; color: var(--text-dim); font-size: var(--fs-base); margin-bottom: 28px; }
.auth-foot{ text-align: center; font-size: var(--fs-base); color: var(--text-dim); margin-top: 22px; }
.auth-foot a{ color: var(--accent); font-weight: 600; }

.fade-in{ animation: fadeIn var(--dur-2) var(--ease); }
.vertex-indicator{ width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.vertex-indicator.online{ background: var(--success); box-shadow: 0 0 0 3px color-mix(in srgb, var(--success) 22%, transparent); }
.vertex-indicator.offline{ background: var(--danger); }
.vertex-indicator.checking{ background: var(--warning); }

.mobile-menu-btn{ display: none; }
.sidebar-scrim{ display: none; }

/* ============================== MOTION ============================== */

@keyframes typingDots{ 0%{ content: ""; } 33%{ content: "."; } 66%{ content: ".."; } 100%{ content: "..."; } }
@keyframes fadeIn{ from{ opacity: 0; } to{ opacity: 1; } }
@keyframes ddIn{ from{ opacity: 0; transform: translateY(-6px) scale(.98); } to{ opacity: 1; transform: translateY(0) scale(1); } }
@keyframes modalIn{ from{ opacity: 0; transform: scale(.96) translateY(8px); } to{ opacity: 1; transform: scale(1) translateY(0); } }
@keyframes modalOut{ from{ opacity: 1; transform: scale(1) translateY(0); } to{ opacity: 0; transform: scale(.96) translateY(10px); } }
@keyframes itemIn{ from{ opacity: 0; transform: translateY(3px); } to{ opacity: 1; transform: translateY(0); } }
@keyframes msgIn{ from{ opacity: 0; transform: translateY(8px); } to{ opacity: 1; transform: translateY(0); } }
@keyframes fadeUp{ from{ opacity: 0; transform: translateY(10px); } to{ opacity: 1; transform: translateY(0); } }
@keyframes slideIn{ from{ opacity: 0; transform: translateY(-6px); } to{ opacity: 1; transform: translateY(0); } }
@keyframes popIn{ from{ opacity: 0; transform: scale(.96); } to{ opacity: 1; transform: scale(1); } }
@keyframes blink{ 50%{ opacity: 0; } }
@keyframes spin{ to{ transform: rotate(360deg); } }
@keyframes shimmer{ to{ background-position: -200% 0; } }
@keyframes bounceDots{ 0%,60%,100%{ transform: translateY(0); opacity: .4; } 30%{ transform: translateY(-4px); opacity: 1; } }

.chat-item, .prompt-card, .key-row, .provider-group, .memory-item, .file-card, .model-card, .theme-card{
  animation: itemIn .2s var(--ease);
}

/* ============================== APPEARANCE PREFERENCES ============================== */

html[data-animations="off"] *, html[data-animations="off"] *::before, html[data-animations="off"] *::after{
  animation: none !important; transition: none !important;
}
[data-animations="off"] .suggestion-card,
[data-animations="off"] .theme-tile,
[data-animations="off"] .welcome-logo,
[data-animations="off"] .welcome-heading,
[data-animations="off"] .chat-header{ animation: none; transition: none; }

html[data-contrast="increased"]{ --text: #ffffff; --text-dim: #d3d3d8; --text-faint: #a6a6ad; }
html.light[data-contrast="increased"]{ --text: #000000; --text-dim: #2f2f2f; --text-faint: #555555; }
html[data-contrast="low"]{ --text-dim: #b8b8bd; --text-faint: #94949a; }

/* ---- OLED mode: pure-black true-black backgrounds for maximum battery/depth ----
   The engine sets all OLED-relevant *colors* inline, but shadows/glows/glass and
   the ambient page glow are rebuilt here so nothing draws near-white fallback. */
html[data-oled="on"] body::before{ background: none; }
html[data-oled="on"]{
  --shadow-xs: none;
  --shadow-sm: none;
  --shadow-md: 0 0 0 1px rgba(255,255,255,.04), 0 12px 34px -12px rgba(0,0,0,.9);
  --shadow-lg: 0 0 0 1px rgba(255,255,255,.05), 0 22px 60px -16px rgba(0,0,0,.92);
  --shadow-glow: 0 0 0 2px color-mix(in srgb, var(--accent) 34%, transparent);
}
html[data-oled="on"] .glass,
html[data-oled="on"] .card.glass{
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

/* ---- prefers-reduced-motion: user-level reduce (distinct from data-animations) ---- */
@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{ animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}

html[data-font-size="small"] .nav-item{ font-size: var(--fs-sm); }
html[data-font-size="small"] .chat-item{ font-size: 13px; }
html[data-font-size="small"] .msg-bubble{ font-size: 14px; }
html[data-font-size="small"] .composer textarea{ font-size: var(--fs-md); }
html[data-font-size="small"] .composer-hint{ font-size: 11px; }
html[data-font-size="small"] .suggestion-title{ font-size: var(--fs-base); }
html[data-font-size="small"] .settings-row .info .t{ font-size: var(--fs-base); }
html[data-font-size="large"] .nav-item{ font-size: 16px; }
html[data-font-size="large"] .chat-item{ font-size: 15px; }
html[data-font-size="large"] .msg-bubble{ font-size: 17px; }
html[data-font-size="large"] .composer textarea{ font-size: 17px; }
html[data-font-size="large"] .composer-hint{ font-size: var(--fs-sm); }
html[data-font-size="large"] .suggestion-title{ font-size: 16px; }
html[data-font-size="large"] .settings-row .info .t{ font-size: 16px; }

html[data-density="compact"] .nav-item{ height: 32px; }
html[data-density="compact"] .chat-item{ height: 30px; }
html[data-density="compact"] .msg{ margin: 4px 0; }
html[data-density="compact"] .card{ padding: 16px; }
html[data-density="compact"] .settings-row{ padding: 10px 0; }
html[data-density="compact"] .msg-bubble{ padding: 12px 16px; }
html[data-density="compact"] .composer{ padding: 8px 10px 8px 16px; }
html[data-density="compact"] .prompt-card{ padding: 14px 16px; }
html[data-density="compact"] .theme-card{ padding: 12px; }
html[data-density="compact"] .topbar{ height: 54px; }
html[data-density="spacious"] .nav-item{ height: 44px; }
html[data-density="spacious"] .chat-item{ height: 42px; }
html[data-density="spacious"] .msg{ margin: 12px 0; }
html[data-density="spacious"] .card{ padding: 26px; }
html[data-density="spacious"] .settings-row{ padding: 20px 0; }
html[data-density="spacious"] .msg-bubble{ padding: 18px 22px; }
html[data-density="spacious"] .composer{ padding: 14px 16px 14px 22px; }
html[data-density="spacious"] .prompt-card{ padding: 22px 24px; }
html[data-density="spacious"] .theme-card{ padding: 18px; }
html[data-density="spacious"] .topbar{ height: 66px; }

@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{ animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .stream-caret, .typing-indicator .dot{ animation: none; }
}

/* ===================== EXTENDED / LEGACY SHARED CONTROLS =====================
   Premium re-definitions of the controls historically shipped only in the
   legacy style.css. They are token-driven so any surface (legacy or new)
   renders identically. Kept as stable class hooks — do not rename.          */

.hidden{ display: none !important; }

/* ---- settings / preferences cards ---- */
.settings-card{
  border-radius: var(--radius-lg); border: 1px solid var(--border);
  background: var(--surface-solid); box-shadow: var(--shadow-xs);
  padding: 6px 0; margin-bottom: 24px; overflow: hidden;
}
.settings-card-header{
  padding: 20px 24px 16px; border-bottom: 1px solid var(--border-light);
  display: flex; align-items: center; gap: 12px;
}
.settings-card-header .section-icon{ flex-shrink: 0; }
.settings-card-header h3{ font-size: var(--fs-lg); margin: 0; }
.settings-card + .settings-card{ margin-top: 24px; }
.setting-item{
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  padding: 16px 24px; border-bottom: 1px solid var(--border-light);
}
.setting-item:last-child{ border-bottom: none; }
.setting-info{ display: flex; flex-direction: column; min-width: 0; gap: 4px; }
.setting-title{ font-weight: 600; font-size: var(--fs-base); color: var(--text); }
.setting-desc{ font-size: var(--fs-sm); color: var(--text-faint); line-height: 1.5; }
.setting-control{ display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.setting-select{
  height: 38px; min-width: 168px; padding: 0 14px; border-radius: var(--radius-md);
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  font-family: var(--font-body); font-size: var(--fs-base); cursor: pointer;
  transition: border-color var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease);
}
.setting-select:hover{ border-color: var(--border-strong); }
.setting-select:focus{ border-color: var(--accent); box-shadow: var(--shadow-glow); outline: none; }
.setting-textarea{
  width: 100%; min-height: 96px; border-radius: var(--radius-md);
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  padding: 12px 14px; font-family: var(--font-body); font-size: var(--fs-base); line-height: 1.6;
  resize: vertical;
  transition: border-color var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease);
}
.setting-textarea:focus{ border-color: var(--accent); box-shadow: var(--shadow-glow); outline: none; }
.setting-sliders{ display: inline-flex; border: 1px solid var(--border); border-radius: var(--radius-md); overflow: hidden; background: var(--surface); }
.slider-btn{
  padding: 9px 16px; border: none; background: transparent; color: var(--text-dim);
  font-size: var(--fs-sm); font-weight: 600; cursor: pointer;
  transition: all var(--dur-1) var(--ease);
}
.slider-btn + .slider-btn{ border-left: 1px solid var(--border-light); }
.slider-btn:hover{ color: var(--text); background: var(--surface-hover); }
.slider-btn.active{
  color: var(--accent); background: color-mix(in srgb, var(--accent) 14%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 28%, transparent);
}
.field-full{ width: 100%; }

/* ---- legacy toggle switch ---- */
.toggle-switch{
  position: relative; width: 42px; height: 24px; flex-shrink: 0; cursor: pointer; display: inline-block;
}
.toggle-switch input{ position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.toggle-switch .toggle-slider{
  position: absolute; inset: 0; border-radius: var(--radius-full);
  background: var(--surface-hover); border: 1px solid var(--border);
  transition: background var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease);
}
.toggle-switch .toggle-slider::before{
  content: ""; position: absolute; top: 2px; left: 2px; width: 18px; height: 18px; border-radius: 50%;
  background: var(--text-dim); box-shadow: 0 1px 2px rgba(0,0,0,.3);
  transition: transform var(--dur-1) var(--ease), background var(--dur-1) var(--ease);
}
.toggle-switch input:checked + .toggle-slider{ background: var(--accent); border-color: transparent; }
.toggle-switch input:checked + .toggle-slider::before{ transform: translateX(18px); background: var(--accent-contrast); }
.toggle-switch input:focus-visible + .toggle-slider{ outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---- shortcut list ---- */
.shortcut-item{
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px 0; border-bottom: 1px solid var(--border-light);
}
.shortcut-item:last-child{ border-bottom: none; }
.shortcut-item .label{ font-size: var(--fs-base); color: var(--text-dim); }
.keycombo{ display: flex; align-items: center; gap: 5px; }
.keycombo kbd{
  font-family: var(--font-mono); font-size: var(--fs-sm); color: var(--text);
  background: var(--surface-solid); border: 1px solid var(--border); border-radius: var(--radius-xs);
  padding: 4px 9px; box-shadow: 0 2px 0 var(--border);
}
.keycombo .danger{ color: var(--danger); }

/* ---- auth helpers ---- */
.pw-toggle{
  position: absolute; right: 8px; bottom: 7px; background: none; border: none;
  color: var(--text-faint); cursor: pointer; padding: 4px; border-radius: var(--radius-xs);
  display: flex; align-items: center; justify-content: center;
  transition: color var(--dur-1) var(--ease);
}
.pw-toggle:hover{ color: var(--text); }
.fade-in-up{ animation: fadeUp var(--dur-2) var(--ease); }
.danger-text{ color: var(--danger); font-weight: 600; }

/* ---- legacy logo lockups (theme-aware swap) ---- */
.logo-img-wrap{
  position: relative; width: 28px; height: 28px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
}
.logo-img-wrap img{ position: absolute; inset: 0; width: 28px; height: 28px; object-fit: contain; transition: opacity var(--dur-2) var(--ease); }
[data-mode="light"] .logo-img-wrap .logo-dark{ opacity: 0; }
[data-mode="dark"] .logo-img-wrap .logo-light{ opacity: 0; }
.logo-wrap{ margin-bottom: 16px; position: relative; width: 48px; height: 48px; display: inline-flex; align-items: center; justify-content: center; }
.logo-wrap img{ position: absolute; inset: 0; width: 48px; height: 48px; object-fit: contain; transition: opacity var(--dur-2) var(--ease); }
[data-mode="light"] .logo-wrap .logo-dark{ opacity: 0; }
[data-mode="dark"] .logo-wrap .logo-light{ opacity: 0; }

.dropdown-logout{ color: var(--danger); }
.dropdown-logout:hover{ background: color-mix(in srgb, var(--danger) 12%, transparent); color: var(--danger); }

/* ---- stat / status chips (shared) ---- */
.status-badge{
  display: inline-flex; align-items: center; gap: 6px; font-size: var(--fs-xs);
  font-weight: 700; padding: 4px 10px; border-radius: var(--radius-full);
  color: var(--text-dim); background: var(--surface-solid); border: 1px solid var(--border);
}
.status-badge.ok{ color: var(--success); }
.status-badge.warn{ color: var(--warning); }
.status-badge.err{ color: var(--danger); }
.status-badge.info{ color: var(--accent); }

/* ---- pagination ---- */
.pagination{
  display: flex; align-items: center; gap: 6px; justify-content: center; margin-top: 20px; flex-wrap: wrap;
}
.pagination button{
  min-width: 36px; height: 36px; padding: 0 12px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--surface); color: var(--text-dim);
  font-size: var(--fs-sm); font-weight: 600; cursor: pointer;
  transition: all var(--dur-1) var(--ease);
}
.pagination button:hover:not(:disabled){ border-color: var(--accent); color: var(--text); background: var(--surface-hover); }
.pagination button.active{ background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }
.pagination button:disabled{ opacity: .4; cursor: not-allowed; }
.pagination .page-info{ font-size: var(--fs-sm); color: var(--text-faint); margin: 0 8px; }

/* ---- table wrapper + responsive tables ---- */
.table-shadow{ overflow: hidden; border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-xs); }
.v-table{ width: 100%; border-collapse: collapse; font-size: var(--fs-base); background: var(--surface-solid); }
.v-table th{
  text-align: left; font-size: var(--fs-xs); font-weight: 700; letter-spacing: .06em;
  text-transform: uppercase; color: var(--text-faint); padding: 12px 16px; border-bottom: 1px solid var(--border);
  background: var(--surface); white-space: nowrap;
}
.v-table td{ padding: 13px 16px; border-bottom: 1px solid var(--border-light); color: var(--text-dim); vertical-align: middle; }
.v-table tr:last-child td{ border-bottom: none; }
.v-table tbody tr{ transition: background var(--dur-1) var(--ease); }
.v-table tbody tr:hover{ background: var(--surface-hover); }
.v-table .muted{ color: var(--text-faint); }

/* ---- generic blank-state ---- */
.blank-state{
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  padding: 56px 24px; text-align: center; color: var(--text-faint);
}
.blank-state svg{ width: 40px; height: 40px; opacity: .45; }
.blank-state b{ color: var(--text-dim); font-size: var(--fs-md); }

.skeleton-card{ position: relative; overflow: hidden; }

/* ---- settings page / modal layout ---- */
.settings-content{ max-width: 720px; margin: 0 auto; padding: 24px 24px 56px; width: 100%; }
.settings-content .settings-card{ margin-bottom: 20px; }
.settings-nav-panel{ width: 200px; flex-shrink: 0; overflow-y: auto; padding: 10px 8px; border-right: 1px solid var(--border); }
.settings-modal-header{ display: flex; align-items: center; justify-content: space-between; padding: 14px 20px; border-bottom: 1px solid var(--border); flex-shrink: 0; }
.settings-modal-header h2{ font-size: var(--fs-md); font-weight: 600; letter-spacing: -0.02em; }
.settings-modal-body{ display: flex; flex: 1; min-height: 0; overflow: hidden; }
.settings-modal-body .settings-content{ padding: 22px 26px; max-width: none; }
.settings-nav-panel .nav-group-title{ padding: 8px 10px 4px; font-size: 10px; letter-spacing: 0.06em; color: var(--text-faint); }
.settings-nav-panel .nav-item{ padding: 7px 10px; font-size: var(--fs-sm); border-radius: var(--radius-sm); margin-bottom: 1px; gap: 8px; }
.settings-nav-panel .nav-item.active{ background: var(--surface-hover); color: var(--text); font-weight: 500; position: relative; }
.settings-nav-panel .nav-item.active::before{ content:''; position:absolute; left:0; top:6px; bottom:6px; width:3px; border-radius:0 3px 3px 0; background:var(--accent); }
.settings-nav-panel .nav-item svg{ width: 14px; height: 14px; flex-shrink: 0; }
.settings-modal-close{ font-size: 22px; line-height: 1; color: var(--text-faint); width: 32px; height: 32px; border-radius: var(--radius-sm); border: none; background: transparent; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: background var(--dur-1) var(--ease), color var(--dur-1) var(--ease); }
.settings-modal-close:hover{ background: var(--surface-hover); color: var(--text); }

/* ---- sidebar search ---- */
.sidebar-search{ position: relative; margin: 4px 0 6px; }
.sidebar-search svg{ position: absolute; left: 10px; top: 50%; transform: translateY(-50%); width: 14px; height: 14px; color: var(--text-faint); pointer-events: none; }
.sidebar-search-input{
  width: 100%; padding: 7px 10px 7px 30px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  font-size: var(--fs-sm); outline: none;
  transition: border-color var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease);
}
.sidebar-search-input:focus{ border-color: var(--accent); box-shadow: var(--shadow-glow); }
.sidebar-search-input::placeholder{ color: var(--text-faint); }

/* ---- settings form controls / memory / themes / sessions / avatar (legacy settings.html) ---- */
.setting-input{ width: 100%; padding: 8px 12px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--surface-solid); color: var(--text); font-size: var(--fs-base); outline: none; transition: border-color var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease); }
.setting-input:focus{ border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 12%, transparent); }
.setting-input::placeholder{ color: var(--text-faint); }
.storage-info{ display: flex; justify-content: space-between; font-size: 11.5px; color: var(--text-faint); margin-top: 4px; }
.about-you-grid{ display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.about-you-grid .field-full{ grid-column: 1 / -1; }
.about-you-grid .field{ margin-bottom: 0; }
.about-you-grid .field label{ display: block; font-size: 11.5px; font-weight: 600; color: var(--text-dim); margin-bottom: 3px; }

.memory-header-row{ display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin-bottom: 10px; }
.memory-header-info{ flex: 1; min-width: 0; }
.memory-header-actions{ display: flex; gap: 6px; flex-shrink: 0; }
.memory-stat-chips{ display: flex; flex-wrap: wrap; gap: 8px; }
.memory-toolbar{ display: flex; gap: 8px; align-items: center; margin-bottom: 12px; }
.memory-toolbar .input{ flex: 1; min-width: 0; }
.memory-toolbar .setting-select{ min-width: 150px; }
.memory-pagination{ display: flex; align-items: center; justify-content: center; gap: 10px; margin-top: 12px; }
.memory-page-info{ font-size: 11.5px; color: var(--text-faint); }
.memory-card{ display: flex; flex-direction: column; gap: 6px; padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); margin-bottom: 8px; transition: border-color var(--dur-1) var(--ease), background var(--dur-1) var(--ease); }
.memory-card:hover{ border-color: var(--accent); background: var(--surface-hover); }
.memory-card-top{ display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.memory-category{ font-size: 10px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--accent); font-weight: 700; }
.memory-key{ font-size: 13.5px; font-weight: 700; color: var(--text); word-break: break-word; }
.memory-value{ font-size: 12.5px; color: var(--text-dim); line-height: 1.5; word-break: break-word; white-space: pre-wrap; }
.memory-meta{ font-size: 10.5px; color: var(--text-faint); }
.memory-actions{ display: flex; gap: 6px; margin-top: 2px; }
.memory-actions .btn[disabled]{ opacity: 0.45; cursor: default; }
.memory-importance{ display: inline-flex; align-items: center; gap: 5px; font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-faint); padding: 2px 8px; border-radius: 999px; border: 1px solid var(--border); background: var(--surface); }
.memory-importance::before{ content: ''; width: 7px; height: 7px; border-radius: 50%; background: currentColor; flex-shrink: 0; }
.memory-importance.critical{ color: var(--success); }
.memory-importance.high{ color: var(--info); }
.memory-importance.medium{ color: var(--warning); }
.memory-importance.low{ color: var(--text-faint); }
.memory-empty{ text-align: center; padding: 24px 12px; font-size: 13px; color: var(--text-dim); }
.memory-empty-hint{ text-align: center; padding: 0 12px 16px; font-size: 11.5px; color: var(--text-faint); }
.memory-profile-grid{ display: grid; grid-template-columns: 1fr 1fr; gap: 2px 18px; }
.memory-profile-item{ display: flex; align-items: baseline; gap: 10px; padding: 5px 0; border-bottom: 1px solid var(--border-light); }
.memory-profile-label{ flex-shrink: 0; min-width: 110px; font-size: 11px; font-weight: 600; color: var(--text-faint); text-transform: capitalize; }
.memory-profile-value{ font-size: 12.5px; color: var(--text); word-break: break-word; }
.memory-summary-card{ padding: 10px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); margin-bottom: 8px; }
.memory-summary-head{ display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.memory-summary-title{ font-size: 12.5px; font-weight: 600; color: var(--text); word-break: break-word; }
.memory-summary-meta{ font-size: 10.5px; color: var(--text-faint); margin: 3px 0 5px; }
.memory-summary-text{ font-size: 12px; color: var(--text-dim); line-height: 1.55; white-space: pre-wrap; word-break: break-word; }

.custom-theme-row{ display: flex; align-items: center; gap: 10px; padding: 8px 10px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); }
.custom-theme-row:hover{ border-color: var(--accent); }
.custom-theme-row.active{ border-color: var(--accent); box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 25%, transparent); }

.session-row{ display: flex; align-items: center; gap: 12px; padding: 10px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); }
.session-row.current{ border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); }
.session-icon{ width: 32px; height: 32px; border-radius: 50%; flex-shrink: 0; display: flex; align-items: center; justify-content: center; background: var(--surface-hover); color: var(--text-faint); }
.session-info{ flex: 1; min-width: 0; }
.session-name{ font-size: 12.5px; font-weight: 600; color: var(--text); }
.session-meta{ font-size: 11px; color: var(--text-faint); margin-top: 1px; line-height: 1.4; }
.session-current{ display: inline-block; margin-left: 6px; padding: 1px 7px; font-size: 9.5px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; border-radius: 999px; color: var(--success); border: 1px solid color-mix(in srgb, var(--success) 45%, transparent); }
.revoke-session-btn{ margin-left: auto; flex-shrink: 0; }
.family-search-empty{ text-align: center; padding: 16px; font-size: 12px; color: var(--text-faint); }

.theme-gallery{ display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 10px; }
.custom-theme-builder{ }
.color-input{ width: 100%; height: 34px; padding: 2px; border: 1px solid var(--border); border-radius: var(--radius-xs); background: var(--surface-solid); cursor: pointer; }
.color-input:hover{ border-color: var(--accent); }
.custom-themes-list{ display: flex; flex-direction: column; gap: 6px; }
.custom-theme-chip{ width: 28px; height: 28px; border-radius: 50%; border: 2px solid; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.custom-theme-chip i{ width: 10px; height: 10px; border-radius: 50%; }
.custom-theme-name{ font-size: 12.5px; font-weight: 600; color: var(--text); }
.theme-live-preview{ width: 52px; height: 34px; border-radius: 8px; border: 2px solid; display: flex; align-items: center; justify-content: center; gap: 6px; transition: background var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease); flex-shrink: 0; }
.theme-live-accent{ width: 12px; height: 12px; border-radius: 50%; }
.theme-live-text{ font-size: 12px; font-weight: 700; color: var(--text); text-shadow: 0 1px 2px rgba(0,0,0,0.6); }

.sessions-list{ display: flex; flex-direction: column; gap: 6px; }

.avatar-edit-row{ display: flex; align-items: center; gap: 14px; }
.avatar-preview{ width: 64px; height: 64px; border-radius: 50%; overflow: hidden; background: var(--surface-hover); border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.avatar-preview img{ width: 100%; height: 100%; object-fit: cover; }
.avatar-preview .avatar-initials{ width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; font-size: 22px; font-weight: 700; color: var(--text); }
.avatar-edit-actions{ display: flex; flex-direction: column; gap: 6px; align-items: flex-start; }

/* ---- about / models page ---- */
.about-hero{ text-align: center; padding: 3rem 2rem 2rem; max-width: 720px; margin: 0 auto; }
.about-hero h1{ font-size: 1.8rem; margin-bottom: 0.5rem; }
.about-hero p{ color: var(--text-dim); font-size: 0.9rem; line-height: 1.6; }
.about-section{ max-width: 720px; margin: 0 auto 2rem; }
.about-section h2{ font-size: 1.1rem; margin-bottom: 0.75rem; display: flex; align-items: center; gap: 8px; }
.about-section h2 svg{ width: 18px; height: 18px; flex-shrink: 0; }
.about-section p, .about-section li{ font-size: 0.85rem; color: var(--text-dim); line-height: 1.7; }
.about-section ul{ padding-left: 1.2rem; }
.about-section ul li{ margin-bottom: 0.4rem; }
.model-timeline{ display: flex; flex-direction: column; gap: 12px; }
.timeline-item{ display: flex; gap: 14px; padding: 14px; border-radius: var(--radius-md); background: var(--surface); border: 1px solid var(--border); }
.timeline-item .step{ width: 32px; height: 32px; border-radius: 50%; background: var(--accent); color: var(--accent-contrast); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 13px; flex-shrink: 0; }
.timeline-item .desc{ flex: 1; }
.timeline-item .desc h4{ font-size: 0.9rem; margin-bottom: 4px; }
.timeline-item .desc p{ font-size: 0.8rem; color: var(--text-faint); }
.tech-badge{ display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: var(--radius-sm); background: var(--surface); border: 1px solid var(--border); font-size: 0.75rem; color: var(--text-dim); margin: 3px; }
.tech-badges{ display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0; }

/* ---- setup wizard ---- */
.setup-container{ display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 100vh; padding: 2rem; text-align: center; }
.setup-logo{ width: 72px; height: 72px; margin-bottom: 1.5rem; border-radius: var(--radius-lg); background: var(--surface-solid); border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; color: var(--text); font-size: 1.8rem; }
.setup-card{ max-width: 480px; width: 100%; background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-xl); padding: 2rem; margin-bottom: 1rem; text-align: left; }
.setup-card h2{ font-size: 1.15rem; margin-bottom: 0.75rem; }
.setup-card p{ font-size: 0.85rem; color: var(--text-dim); margin-bottom: 1rem; }
.setup-steps{ display: flex; gap: 0.5rem; justify-content: center; margin-bottom: 2rem; }
.setup-step{ width: 10px; height: 10px; border-radius: 50%; background: var(--border); }
.setup-step.active{ background: var(--accent); }
.setup-step.done{ background: var(--success); }

/* ---- AI provider admin (admin_providers.html) ---- */
.ai-admin{ max-width: 1180px; margin: 0 auto; padding: 24px; }
.ai-admin h1{ font-size: 22px; margin-bottom: 4px; }
.ai-admin .sub{ color: var(--text-faint); font-size: 13px; margin-bottom: 22px; }
.ai-grid{ display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin-bottom: 24px; }
.ai-stat{ border: 1px solid var(--border, #222); border-radius: var(--radius-sm); padding: 14px 16px; background: var(--surface); }
.ai-stat .num{ font-size: 26px; font-weight: 600; margin-top: 6px; }
.ai-stat .lbl{ font-size: 12px; color: var(--text-faint); text-transform: uppercase; letter-spacing: .5px; }
.ai-card{ border: 1px solid var(--border, #222); border-radius: var(--radius-md); padding: 18px; margin-bottom: 20px; background: var(--surface); }
.ai-card h3{ font-size: 15px; margin: 0 0 12px; display: flex; justify-content: space-between; align-items: center; }
.ai-table{ width: 100%; border-collapse: collapse; font-size: 13px; }
.ai-table th{ text-align: left; color: var(--text-faint); font-weight: 500; font-size: 11px; text-transform: uppercase; letter-spacing: .5px; padding: 6px 8px; border-bottom: 1px solid var(--border, #222); }
.ai-table td{ padding: 8px; border-bottom: 1px solid var(--border, #111); vertical-align: top; }
.ai-badge{ display: inline-block; padding: 2px 9px; border-radius: 20px; font-size: 11px; font-weight: 600; }
.ai-badge.ok{ background: var(--success-soft); color: var(--success); }
.ai-badge.degraded{ background: var(--warning-soft); color: var(--warning); }
.ai-badge.bad{ background: var(--danger-soft); color: var(--danger); }
.ai-badge.neutral{ background: var(--surface-hover); color: var(--text-faint); }
.ai-btn{ background: var(--accent); color: var(--accent-contrast); border: none; border-radius: var(--radius-sm); padding: 6px 12px; font-size: 12px; font-weight: 600; cursor: pointer; }
.ai-btn.small{ padding: 3px 8px; font-size: 11px; }
.ai-chip{ display: inline-block; font-size: 11px; padding: 1px 7px; border-radius: 12px; margin: 1px 2px; background: var(--surface-hover); color: var(--text-faint); }
.ai-actions{ display: flex; gap: 6px; flex-wrap: wrap; }
.ai-mono{ font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12px; }
.ai-bar{ height: 6px; border-radius: 4px; background: var(--surface-hover); margin-top: 4px; overflow: hidden; }
.ai-bar > i{ display: block; height: 100%; background: #22c55e; }
.ai-section-title{ font-size: 13px; font-weight: 600; color: var(--text-faint); text-transform: uppercase; letter-spacing: .6px; margin: 22px 0 10px; }
.ai-refresh{ margin-left: auto; }
.ai-error{ color: #ef4444; font-size: 13px; padding: 8px 0; }

/* ---- playground extras ---- */
.dev-pg-left, .dev-pg-right{ min-width: 0; }
.dev-quick-actions{ display: flex; flex-wrap: wrap; gap: 8px; }
.dev-sdk-tab{
  padding: 10px 16px; border-bottom: none; border-radius: var(--radius-sm);
}
.dev-sdk-tab:hover{ background: var(--surface-hover); border-radius: var(--radius-sm); }
.dev-sdk-tab.active{
  border-bottom: none; color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: var(--radius-sm);
}
.key-perm, .wh-event{ accent-color: var(--accent); }
.settings-tip{ font-size: var(--fs-sm); color: var(--text-faint); line-height: 1.5; margin-bottom: 10px; }

/* ============================== ACCESSIBILITY ============================== */

.skip-link{
  position: fixed; top: 8px; left: 8px; z-index: 500; padding: 10px 14px;
  background: var(--bg-elevated); color: var(--text); border: 1px solid var(--accent);
  border-radius: var(--radius-sm); font-weight: 600; text-decoration: none;
  transform: translateY(-140%); transition: transform var(--dur-1) var(--ease);
}
.skip-link:focus{ transform: translateY(0); }

/* ============================== RESPONSIVE ============================== */

@media (max-width: 1000px){
  .settings-modal{ width: min(96vw, 860px); }
  .page-content{ max-width: 100%; }
}

@media (max-width: 900px){
  .sidebar{ position: fixed; left: 0; top: 0; bottom: 0; z-index: 100; width: 300px !important; }
  .sidebar.hidden{ display: none; }
  .sidebar-scrim{ display: block; position: fixed; inset: 0; background: var(--layer); z-index: 90; }
  .sidebar-scrim.hidden{ display: none; }
  .mobile-menu-btn{ display: flex; }
  .settings-modal{ width: 100vw; height: 100vh; max-height: 100vh; border-radius: 0; }
}

@media (max-width: 720px){
  .welcome-screen{ padding: 24px 16px 36px; justify-content: flex-start; }
  .suggestion-grid{ grid-template-columns: 1fr; }
  .chat-header{ padding-top: 12px; }
  .msg{ padding: 6px 16px; }
  .composer-wrap{ padding: 12px 12px 16px; }
  .settings-modal .sm-nav{ width: 200px; }

  .page-header{ padding: 20px 16px 0; }
  .page-content{ padding: 20px 16px 96px; }
  .topbar{ padding: 0 14px; }
  .topbar .topbar-title{ display: none; }
  .msg .msg-row{ max-width: 94%; }
  .msg-bubble{ max-width: 100%; }
  .modal{ padding: 22px 18px; }
  .settings-card{ border-radius: var(--radius-md); }
  .setting-item{ padding: 14px 18px; gap: 14px; }
  .setting-item{ flex-wrap: wrap; }
  .setting-info{ flex: 1 1 100%; }
  .setting-control{ margin-left: auto; }
}

/* ---- mobile bottom navigation (opt-in) ----
   Renders a floating dock bar only when a page opts in with
   <nav class="bottom-nav" aria-label="Primary">…</nav> on small screens. */
.bottom-nav{
  display: none;
}
@media (max-width: 900px){
  body.has-bottom-nav .main{ padding-bottom: 64px; }
  .bottom-nav{
    display: flex; align-items: stretch; gap: 2px;
    position: fixed; left: 12px; right: 12px; bottom: max(12px, env(safe-area-inset-bottom));
    z-index: 120; padding: 6px; border-radius: var(--radius-2xl);
    background: color-mix(in srgb, var(--bg-elevated) 88%, transparent);
    border: 1px solid var(--border); box-shadow: var(--shadow-lg);
    backdrop-filter: blur(var(--glass-blur)) saturate(140%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(140%);
    animation: fadeUp var(--dur-2) var(--ease);
  }
  .bottom-nav a, .bottom-nav button{
    flex: 1; display: flex; flex-direction: column; align-items: center; gap: 3px;
    min-width: 0; padding: 8px 4px; border: none; background: transparent; cursor: pointer;
    color: var(--text-faint); font-size: 10px; font-weight: 600; text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all var(--dur-1) var(--ease);
  }
  .bottom-nav a:hover, .bottom-nav button:hover{ background: var(--surface-hover); color: var(--text); }
  .bottom-nav a.active, .bottom-nav button.active{
    color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent);
  }
  .bottom-nav svg{ width: 21px; height: 21px; }
}

/* NOTE: do not apply any global zoom/scale — the UI must render at native
   size to preserve ChatGPT-style proportions and readable typography. */

/* ===================== UI CUSTOMIZATION (appearance tokens) =====================
   Consumes the data-* attributes (contract section B) and the CSS custom
   properties the engine sets inline on <html> (contract section C). Every
   rule here is additive / token-driven and safe to leave in place.          */

/* ---- 1. CURSOR ---- */
html[data-cursor-style] *{ cursor: var(--cursor-url, auto); }
html[data-cursor-style] a, html[data-cursor-style] button,
html[data-cursor-style] [role="button"], html[data-cursor-style] select,
html[data-cursor-style] input[type="range"], html[data-cursor-style] .clickable,
html[data-cursor-style] label.toggle{ cursor: var(--cursor-ptr, pointer); }
html[data-cursor-style] input[type="text"], html[data-cursor-style] input:not([type]),
html[data-cursor-style] textarea{ cursor: text; }

#vertex-cursor{
  position: fixed; top: 0; left: 0; z-index: 99999; pointer-events: none;
  will-change: transform; display: none; border-radius: 50%;
}
html[data-cursor-style="dot"] #vertex-cursor,
html[data-cursor-style="minimal"] #vertex-cursor,
html[data-cursor-style="neon"] #vertex-cursor,
html[data-cursor-style="ring"] #vertex-cursor,
html[data-cursor-style="glass"] #vertex-cursor{ display: block; }
html[data-cursor-style="dot"] #vertex-cursor{
  width: 10px; height: 10px; background: var(--accent); border: none; box-shadow: none;
}
html[data-cursor-style="minimal"] #vertex-cursor{
  width: 8px; height: 8px; background: var(--text); border: none; box-shadow: none;
}
html[data-cursor-style="neon"] #vertex-cursor{
  width: 10px; height: 10px; background: var(--accent);
  box-shadow: 0 0 12px var(--accent), 0 0 30px var(--accent); border: none;
}
html[data-cursor-style="ring"] #vertex-cursor{
  width: 26px; height: 26px; border: 2px solid var(--accent); background: transparent; box-shadow: none;
}
html[data-cursor-style="glass"] #vertex-cursor{
  width: 16px; height: 16px; border: 1px solid color-mix(in srgb, var(--text) 40%, transparent);
  background: rgba(255,255,255,.08); box-shadow: none;
  backdrop-filter: blur(2px); -webkit-backdrop-filter: blur(2px);
}
html[data-cursor-style="dot"] #vertex-cursor.hover,
html[data-cursor-style="minimal"] #vertex-cursor.hover,
html[data-cursor-style="neon"] #vertex-cursor.hover{ transform: scale(1.4); }
html[data-cursor-style="ring"] #vertex-cursor.hover,
html[data-cursor-style="glass"] #vertex-cursor.hover{ transform: scale(1.25); }
#vertex-cursor.down{ transform: scale(.7); }
#vertex-cursor.loading{ animation: cursorPulse 1s ease-in-out infinite; }
@keyframes cursorPulse{ 0%,100%{ transform: scale(1); opacity: 1; } 50%{ transform: scale(1.3); opacity: .6; } }

@media (pointer: coarse){ #vertex-cursor{ display: none !important; } }
@media (prefers-reduced-motion: reduce){ #vertex-cursor{ display: none !important; } }
html[data-cursor-style="system"] #vertex-cursor{ display: none !important; }

/* ---- 2. BACKGROUND (image/gradient/wallpaper/glass) ---- */
html[data-bg-type="solid"] body{ background: var(--bg); }
html[data-bg-type="image"] body,
html[data-bg-type="gradient"] body,
html[data-bg-type="wallpaper"] body,
html[data-bg-type="glass"] body{ background: transparent; }

body::after{
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image: var(--bg-image, none);
  background-position: var(--bg-pos, center);
  background-size: var(--bg-size, cover);
  background-repeat: var(--bg-repeat, no-repeat);
  filter: blur(var(--bg-blur, 0px)) brightness(var(--bg-brightness, 100%))
          contrast(var(--bg-contrast, 100%)) saturate(var(--bg-saturate, 100%));
  opacity: var(--bg-opacity, 1);
}
html[data-bg-type]:not([data-bg-type="solid"]) body::before{
  background:
    radial-gradient(700px 500px at 15% -10%, color-mix(in srgb, var(--accent) 6%, transparent), transparent 60%),
    radial-gradient(600px 500px at 110% 10%, color-mix(in srgb, var(--accent) 4%, transparent), transparent 60%),
    linear-gradient(var(--bg-overlay, transparent), var(--bg-overlay, transparent)),
    linear-gradient(var(--bg-tint, transparent), var(--bg-tint, transparent));
  box-shadow: inset 0 0 200px var(--bg-vignette, transparent);
  z-index: 1;
}
html[data-bg-type="solid"] body::before{
  background:
    radial-gradient(700px 500px at 15% -10%, color-mix(in srgb, var(--accent) 6%, transparent), transparent 60%),
    radial-gradient(600px 500px at 110% 10%, color-mix(in srgb, var(--accent) 4%, transparent), transparent 60%);
  box-shadow: none;
}
html[data-oled="on"] body::before{ background: none !important; box-shadow: none; }

.app, .main, .page, .page-shell, .page-main, .chat, .chat-scroll,
.settings-content, main{ position: relative; z-index: 1; }

/* ---- 3. SCALE + DENSITY ---- */
html[data-scale]{
  --sp-1: calc(4px * var(--scale, 1));
  --sp-2: calc(8px * var(--scale, 1));
  --sp-3: calc(12px * var(--scale, 1));
  --sp-4: calc(16px * var(--scale, 1));
  --sp-5: calc(20px * var(--scale, 1));
  --sp-6: calc(24px * var(--scale, 1));
  --sp-8: calc(32px * var(--scale, 1));
  --space-xs: var(--sp-1);
  --space-sm: var(--sp-2);
  --space-md: var(--sp-4);
  --space-lg: var(--sp-6);
  --space-xl: calc(40px * var(--scale, 1));
}
html[data-density]{ --space-md: calc(var(--space-md) * var(--density-scale, 1)); }
html[data-density="compact"]{
  --space-xs: calc(var(--sp-1) * .86);
  --space-sm: calc(var(--sp-2) * .86);
  --space-md: calc(var(--sp-4) * .86);
}
html[data-density="relaxed"]{
  --space-xs: calc(var(--sp-1) * 1.14);
  --space-sm: calc(var(--sp-2) * 1.14);
  --space-md: calc(var(--sp-4) * 1.14);
}
html[data-density="relaxed"] .nav-item{ height: 44px; }
html[data-density="relaxed"] .chat-item{ height: 42px; }
html[data-density="relaxed"] .msg{ margin: 12px 0; }
html[data-density="relaxed"] .card{ padding: 26px; }
html[data-density="relaxed"] .settings-row{ padding: 20px 0; }
html[data-density="relaxed"] .msg-bubble{ padding: 18px 22px; }
html[data-density="relaxed"] .composer{ padding: 14px 16px 14px 22px; }
html[data-density="relaxed"] .prompt-card{ padding: 22px 24px; }
html[data-density="relaxed"] .theme-card{ padding: 18px; }
html[data-density="relaxed"] .topbar{ height: 66px; }

/* ---- 4. RADIUS ---- */
html[data-radius="sharp"]{ --radius-xs: 2px; --radius-sm: 4px; --radius-md: 6px; --radius-lg: 8px; --radius-xl: 10px; --radius-2xl: 12px; }
html[data-radius="small"]{ --radius-xs: 3px; --radius-sm: 5px; --radius-md: 7px; --radius-lg: 10px; --radius-xl: 12px; --radius-2xl: 14px; }
html[data-radius="large"]{ --radius-xs: 8px; --radius-sm: 10px; --radius-md: 14px; --radius-lg: 18px; --radius-xl: 22px; --radius-2xl: 26px; }
html[data-radius="rounded"]{ --radius-xs: 10px; --radius-sm: 14px; --radius-md: 18px; --radius-lg: 24px; --radius-xl: 28px; --radius-2xl: 32px; }

/* ---- 5. FONT ---- */
html, body{
  font-weight: var(--font-weight, 400);
  letter-spacing: var(--letter-spacing, 0px);
  line-height: var(--line-height, 1.6);
}
.msg-bubble p + p, .md-content p + p, .markdown-body p + p{ margin-top: var(--paragraph-spacing, 8px); }
html[data-font-size="xlarge"] .nav-item{ font-size: 17px; }
html[data-font-size="xlarge"] .chat-item{ font-size: 16px; }
html[data-font-size="xlarge"] .msg-bubble{ font-size: 18px; }
html[data-font-size="xlarge"] .composer textarea{ font-size: 18px; }
html[data-font-size="xlarge"] .suggestion-title{ font-size: 17px; }
html{ font-family: var(--font-body, 'Inter', sans-serif); }

/* ---- 6. ANIMATIONS ---- */
html[data-anim-speed="disabled"] *, html[data-anim-speed="disabled"] *::before,
html[data-anim-speed="disabled"] *::after{ animation: none !important; transition: none !important; }
html[data-anim-hover="off"] .nav-item, html[data-anim-hover="off"] .chat-item,
html[data-anim-hover="off"] .btn, html[data-anim-hover="off"] .dropdown-item{ transition: none; }
html[data-anim-chat="off"] .msg, html[data-anim-chat="off"] .msg-bubble{ animation: none; transition: none; }
html[data-anim-sidebar="off"] .sidebar{ transition: none; }
html[data-anim-sidebar="off"] .chat-item{ animation: none; }
html[data-anim-theme="off"] *{ transition-property: none; }
html[data-anim-buttons="off"] .btn, html[data-anim-buttons="off"] .icon-btn{ transition: none; }
html[data-anim-page="off"] .page-transition, html[data-anim-page="off"] body{ animation: none; }

/* ---- 7. TYPING ---- */
html[data-typing="instant"] .stream-caret{ display: none; }
html[data-typing-speed="slow"] .stream-caret{ animation-duration: 1.2s; }
html[data-typing-speed="fast"] .stream-caret{ animation-duration: .45s; }
html[data-typing="fade"] .typing-indicator .dot{ animation: typingFade 1s infinite; }
@keyframes typingFade{ 0%{ opacity: .2; } 50%{ opacity: 1; } 100%{ opacity: .2; } }

/* ---- 8. BLUR ---- */
.sidebar{
  backdrop-filter: blur(var(--blur-sidebar, 0px));
  -webkit-backdrop-filter: blur(var(--blur-sidebar, 0px));
}
.modal, .modal-overlay, .modal-content{
  backdrop-filter: blur(var(--blur-dialog, 0px));
  -webkit-backdrop-filter: blur(var(--blur-dialog, 0px));
}
.dropdown, .dropdown-menu, .user-dropdown{
  backdrop-filter: blur(var(--blur-menu, 0px));
  -webkit-backdrop-filter: blur(var(--blur-menu, 0px));
}
.composer, .prompt-box, .chat-input-wrap{
  backdrop-filter: blur(var(--blur-input, 0px));
  -webkit-backdrop-filter: blur(var(--blur-input, 0px));
}

/* ---- 9. TRANSPARENCY ---- */
.card, .modal, .dropdown, .sidebar, .composer, .settings-card{
  background-color: color-mix(in srgb, var(--surface-solid) calc(var(--alpha-surface, 1) * 100%), transparent);
}
html{ background-color: color-mix(in srgb, var(--bg) calc(var(--alpha-bg, 1) * 100%), #000); }

/* ---- 10. SHADOWS ---- */
html[data-shadows="none"]{ --shadow-xs: none; --shadow-sm: none; --shadow-md: none; --shadow-lg: none; --shadow-glow: none; }
html[data-shadows="strong"]{
  --shadow-sm: 0 2px 6px rgba(0,0,0,.16), 0 8px 20px -4px rgba(0,0,0,.28);
  --shadow-md: 0 4px 10px rgba(0,0,0,.18), 0 18px 44px -8px rgba(0,0,0,.40);
  --shadow-lg: 0 8px 18px rgba(0,0,0,.22), 0 30px 70px -12px rgba(0,0,0,.52);
}
html[data-shadows="premium"]{
  --shadow-md: 0 4px 10px rgba(0,0,0,.14), 0 18px 44px -8px color-mix(in srgb, var(--accent) 14%, transparent);
  --shadow-glow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent), 0 0 24px color-mix(in srgb, var(--accent) 18%, transparent);
}

/* ---- 11. ICON PACK ---- */
html[data-icon-pack="filled"] .v-icon,
html[data-icon-pack="filled"] .nav-item svg,
html[data-icon-pack="filled"] .icon-btn svg,
html[data-icon-pack="filled"] .btn svg,
html[data-icon-pack="filled"] .dropdown-item svg{ fill: currentColor; }
html[data-icon-pack="minimal"] .v-icon,
html[data-icon-pack="minimal"] .nav-item svg,
html[data-icon-pack="minimal"] .icon-btn svg,
html[data-icon-pack="minimal"] .btn svg,
html[data-icon-pack="minimal"] .dropdown-item svg{ stroke-width: 1.4; }
html[data-icon-pack="sharp"] .v-icon,
html[data-icon-pack="sharp"] .nav-item svg,
html[data-icon-pack="sharp"] .icon-btn svg,
html[data-icon-pack="sharp"] .btn svg,
html[data-icon-pack="sharp"] .dropdown-item svg{ stroke-linecap: butt; stroke-linejoin: miter; }
html[data-icon-pack="rounded"] .v-icon,
html[data-icon-pack="rounded"] .nav-item svg,
html[data-icon-pack="rounded"] .icon-btn svg,
html[data-icon-pack="rounded"] .btn svg,
html[data-icon-pack="rounded"] .dropdown-item svg{ stroke-linecap: round; stroke-linejoin: round; }

/* ---- 12. SIDEBAR ---- */
.sidebar{ width: var(--sidebar-w, 260px); }
.sidebar .nav-item svg, .sidebar .nav-icon, .sidebar .nav-item .icon{
  width: var(--sidebar-icon, 20px); height: var(--sidebar-icon, 20px);
}
.sidebar .nav-item{ font-size: var(--sidebar-font, 13.5px); }
.sidebar .nav-group, .sidebar .nav-section{ margin: var(--sidebar-section-gap, 12px) 0; }
.sidebar .avatar, .sidebar .user-chip .avatar, .sidebar .user-avatar{
  width: var(--sidebar-avatar, 32px); height: var(--sidebar-avatar, 32px);
}
html[data-sidebar-collapse="full"] .sidebar{ width: var(--sidebar-w, 260px); }
html[data-sidebar-collapse="mini"] .sidebar{ width: 96px; }
html[data-sidebar-collapse="mini"] .sidebar .nav-item{ justify-content: center; padding: 0; }
html[data-sidebar-collapse="mini"] .sidebar .nav-item .label-text,
html[data-sidebar-collapse="mini"] .sidebar .nav-group-title,
html[data-sidebar-collapse="mini"] .sidebar .wordmark,
html[data-sidebar-collapse="mini"] .sidebar .user-chip .who,
html[data-sidebar-collapse="mini"] .sidebar .user-chip .chevron{ display: none; }

/* ---- 13. CHAT ---- */
.msg-bubble{
  border-radius: var(--chat-msg-radius, 12px);
  max-width: var(--chat-msg-width, 72%);
}
@media (max-width: 720px){ .msg-bubble{ max-width: 100%; } }
.chat-scroll .msg{ margin: var(--chat-msg-gap, 10px) 0; }
.msg .avatar, .msg .msg-avatar{ width: var(--chat-av-a, 28px); height: var(--chat-av-a, 28px); }
.msg.user .avatar, .msg.user .msg-avatar{ width: var(--chat-av-u, 28px); height: var(--chat-av-u, 28px); }
.msg-time, .msg .time{ display: var(--chat-ts, auto); }
html[data-chat-copy="top"] .copy-btn,
html[data-chat-copy="top"] .msg-copy,
html[data-chat-copy="top"] .md-copy{ top: -22px; right: 0; }
html[data-chat-copy="inside"] .copy-btn,
html[data-chat-copy="inside"] .msg-copy,
html[data-chat-copy="inside"] .md-copy{ position: static; margin-left: 6px; opacity: 1; }
html[data-chat-copy="bottom"] .copy-btn,
html[data-chat-copy="bottom"] .msg-copy,
html[data-chat-copy="bottom"] .md-copy{ bottom: -22px; right: 0; }
.md-content, .msg-bubble .md, .markdown-body{ max-width: var(--markdown-width, 80%); }
html[data-code-style="terminal"] .md-code-block{ border-radius: 0; }
html[data-code-style="terminal"] .md-code-head{ background: #1a1a1a; }
html[data-code-style="glass"] .md-code-block{
  background: color-mix(in srgb, var(--surface-solid) 70%, transparent);
  backdrop-filter: blur(8px);
}
html[data-code-style="github"] .md-code-block{ border: 1px solid var(--border); box-shadow: none; }

/* ---- 14. GLASS ---- */
.glass, .card.glass{
  backdrop-filter: blur(var(--glass-blur, 18px));
  -webkit-backdrop-filter: blur(var(--glass-blur, 18px));
  background-color: color-mix(in srgb, var(--surface-solid) calc(var(--glass-alpha, .9) * 100%), transparent);
}
html[data-glass="none"] .glass{
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  background-color: var(--surface-solid);
}
html[data-glass="win11"] .glass{
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--border) 60%, transparent);
}
html[data-glass="macos"] .glass{
  border: 1px solid color-mix(in srgb, var(--text) 8%, transparent);
}

/* ---- 15. ACCENT ---- */
input[type="range"]{ accent-color: var(--accent); }
input[type="checkbox"], input[type="radio"]{ accent-color: var(--accent); }

/* ============================== END UI CUSTOMIZATION ============================== */

/* =====================================================================
   VERTEX v3 UI EXPANSION — additive wave-2 stylesheets
   ---------------------------------------------------------------------
   Consumes the data-* attributes the ENGINE emits on <html> for the v3
   expansion (contract-v3.md). Everything here is ADDITIVE and reuses the
   canonical -- tokens; existing rules are untouched. Peptides below.
   New class hooks introduced by this sheet (documented for the owner JS):
     Window style  : none (targets existing .topbar/.app-shell/.sidebar)
     Composer      : .composer (existing) via html[data-input="…"] variants
     Follower      : [data-cursor-follower] / #vertex-cursor-follower
     Particles     : #vertex-particles
     Galleries     : .gallery-grid, .wallpaper-grid, .preset-grid,
                     .gallery-card, .gallery-thumb, .gallery-name,
                     .fav-star, .gallery-selected
     Custom CSS    : .custom-css-editor, .css-toolbar, .css-pane-wrap,
                     .css-line-gutter, .css-textarea, .css-preview-pane
     Live preview  : .lp-window, .lp-sidebar, .lp-topbar, .lp-chat,
                     .lp-msg (.lp-user /.lp-assistant), .lp-composer,
                     .lp-btn, .lp-card
   ===================== 16. WINDOW STYLE ===================== */

/* vertex (default): no change, keep native .topbar/.app-shell. */

/* windows: accent-tinted topbar + drop shadow + subtle macOS-ish sidebar tint.
   The topbar sits in a "titlebar" strip: keep the 60px chrome but push it
   visually forward with a soft shadow and a hairline accent bloom. */
html[data-window-style="windows"] .topbar{
  background: linear-gradient(90deg,
    color-mix(in srgb, var(--accent) 10%, var(--bg-elevated)),
    var(--bg-elevated));
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 0 color-mix(in srgb, var(--accent) 8%, transparent),
    var(--shadow-xs);
}
html[data-window-style="windows"] .app-shell{
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--accent) 5%, transparent), transparent 140px);
}
html[data-window-style="windows"] .sidebar{
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--accent) 6%, var(--bg-elevated)),
    var(--bg-elevated) 160px);
}
html[data-window-style="windows"] .topbar .window-controls .wbtn,
html[data-window-style="windows"] .window-controls .wbtn{
  border-radius: var(--radius-sm);
}
/* topbar corner rounding when used as a floating titlebar strip */
html[data-window-style="windows"] .topbar{
  margin: var(--sp-2) var(--sp-2) 0;
  height: 56px; border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
html[data-window-style="windows"] body{ overflow: hidden; }

/* macos: frosted (glass) topbar + traffic-light dots when .win-dots present */
html[data-window-style="macos"] .topbar{
  background: color-mix(in srgb, var(--surface-solid) 62%, transparent);
  backdrop-filter: blur(var(--glass-blur)) saturate(150%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  box-shadow: inset 0 -1px 0 color-mix(in srgb, var(--text) 4%, transparent);
}
html[data-window-style="macos"] .app-shell{
  background: radial-gradient(900px 560px at 20% -8%,
    color-mix(in srgb, var(--accent) 5%, transparent), transparent 62%),
    var(--bg);
}
html[data-window-style="macos"] .window-controls,
html[data-window-style="macos"] .macos-controls{
  display: flex; gap: 8px; padding: 0 6px; align-items: center;
}
/* traffic-light dots (elements carry class .win-dots) */
html[data-window-style="macos"] .win-dots{
  display: inline-flex; gap: 8px; align-items: center; flex-shrink: 0;
}
html[data-window-style="macos"] .win-dots span{
  width: 12px; height: 12px; border-radius: 50%; display: block;
  box-shadow: inset 0 0 0 .5px rgba(0,0,0,.15);
}
html[data-window-style="macos"] .win-dots .wd-close{ background: #ff5f57; }
html[data-window-style="macos"] .win-dots .wd-min{ background: #febc2e; }
html[data-window-style="macos"] .win-dots .wd-max{ background: #28c840; }

/* linux: flat, simple topbar (subtle hairline, no heavy glass) */
html[data-window-style="linux"] .topbar{
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  box-shadow: none; backdrop-filter: none;
  -webkit-backdrop-filter: none;
}
html[data-window-style="linux"] .sidebar{ background: var(--bg-elevated); }

/* minimal: remove borders/shadows, tighten chrome */
html[data-window-style="minimal"] .topbar{
  height: 52px; border-bottom: none; background: transparent;
  box-shadow: none; padding: 0 16px;
}
html[data-window-style="minimal"] .sidebar{ box-shadow: none; }
html[data-window-style="minimal"] .notif-popover,
html[data-window-style="minimal"] .modal,
html[data-window-style="minimal"] .card{ box-shadow: none; }
html[data-window-style="minimal"] .composer{
  border: 1px solid var(--border); box-shadow: none;
}

/* frameless: hide the topbar chrome border/seam — flush true titlebar */
html[data-window-style="frameless"] .topbar{
  border-bottom: none; background: transparent;
  box-shadow: none; height: 54px;
}
html[data-window-style="frameless"] .app-shell{ border-radius: 0; }

/* ============ 17. CHAT COMPOSER INPUT STYLES ============
   Each variant refines the base .composer (line ~922). All are gated on
   the html attribute used by existing input styling plus the contract
   dedicated attribute; both composer box and .input/select match. */

/* square: minimal radius */
html[data-input="square"] .composer,
html[data-input-input-style="square"] .composer{ border-radius: 0; }
html[data-input="square"] .input,
html[data-input-input-style="square"] .input,
html[data-input="square"] select.input,
html[data-input-input-style="square"] select.input{ border-radius: 0; }

/* rounded: current radius (base default — explicit for parity) */
html[data-input="rounded"] .composer,
html[data-input-input-style="rounded"] .composer{ border-radius: var(--radius-xl); }
html[data-input="rounded"] .input,
html[data-input-input-style="rounded"] .input{ border-radius: var(--radius-md); }

/* soft: slightly looser radius, lighter shadow */
html[data-input="soft"] .composer,
html[data-input-input-style="soft"] .composer{
  border-radius: calc(var(--radius-xl) + 4px);
  box-shadow: var(--shadow-sm);
  border-color: color-mix(in srgb, var(--border) 80%, transparent);
}
html[data-input="soft"] .input,
html[data-input-input-style="soft"] .input{ border-radius: var(--radius-lg); }

/* glass: translucent blurred surface */
html[data-input="glass"] .composer,
html[data-input-input-style="glass"] .composer{
  background: color-mix(in srgb, var(--surface-solid) 42%, transparent);
  backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  border: 1px solid color-mix(in srgb, var(--text) 8%, var(--border));
  box-shadow: var(--shadow-md);
}
html[data-input="glass"] .input,
html[data-input-input-style="glass"] .input{
  background: color-mix(in srgb, var(--surface-solid) 45%, transparent);
  backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
}

/* minimal: no border / shadow, transparent */
html[data-input="minimal"] .composer,
html[data-input-input-style="minimal"] .composer{
  background: transparent; border: none; box-shadow: none;
  padding: 6px 4px;
}
html[data-input="minimal"] .composer:focus-within,
html[data-input-input-style="minimal"] .composer:focus-within{ box-shadow: none; border: none; }
html[data-input="minimal"] .input,
html[data-input-input-style="minimal"] .input{ background: transparent; border: none; box-shadow: none; }

/* outline: strong accent border, no fill */
html[data-input="outline"] .composer,
html[data-input-input-style="outline"] .composer{
  background: transparent; box-shadow: none;
  border: 2px solid color-mix(in srgb, var(--accent) 90%, transparent);
}
html[data-input="outline"] .composer:focus-within,
html[data-input-input-style="outline"] .composer:focus-within{
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}
html[data-input="outline"] .input,
html[data-input-input-style="outline"] .input{ border-width: 2px; background: transparent; box-shadow: none; }

/* compact: tighter padding, smaller chrome */
html[data-input="compact"] .composer,
html[data-input-input-style="compact"] .composer{ padding: 6px 8px 6px 12px; gap: 8px; }
html[data-input="compact"] .composer textarea,
html[data-input-input-style="compact"] .composer textarea{ padding: 6px 0; font-size: var(--fs-base); }
html[data-input="compact"] .composer-toolbar,
html[data-input-input-style="compact"] .composer-toolbar{ gap: 4px; }
html[data-input="compact"] .input,
html[data-input-input-style="compact"] .input{ height: 34px; }

/* pill: huge radius */
html[data-input="pill"] .composer,
html[data-input-input-style="pill"] .composer{ border-radius: var(--radius-full); }
html[data-input="pill"] .input,
html[data-input-input-style="pill"] .input,
html[data-input="pill"] select.input,
html[data-input-input-style="pill"] select.input{ border-radius: var(--radius-full); }

/* floating: larger radius + bigger shadow + lift */
html[data-input="floating"] .composer,
html[data-input-input-style="floating"] .composer{
  border-radius: calc(var(--radius-xl) + 6px);
  box-shadow: var(--shadow-lg);
  margin-bottom: 8px;
}
html[data-input="floating"] .composer:focus-within,
html[data-input-input-style="floating"] .composer:focus-within{
  box-shadow: var(--shadow-glow), var(--shadow-lg);
}

/* modern: top-aligned + accent underline on focus */
html[data-input="modern"] .composer,
html[data-input-input-style="modern"] .composer{
  border-top: 2px solid var(--border);
  border-bottom: 1px solid transparent;
  align-items: center;
}
html[data-input="modern"] .composer:focus-within,
html[data-input-input-style="modern"] .composer:focus-within{
  border-top-color: var(--accent);
  border-bottom-color: color-mix(in srgb, var(--accent) 20%, transparent);
  box-shadow: none;
}
html[data-input="modern"] .input,
html[data-input-input-style="modern"] .input{ border-top: 2px solid var(--border); }

/* cursor: accent caret + tighter box */
html[data-input="cursor"] .composer,
html[data-input-input-style="cursor"] .composer{ padding: 6px 8px 6px 14px; }
html[data-input="cursor"] .composer textarea,
html[data-input-input-style="cursor"] .composer textarea{ caret-color: var(--accent); }
html[data-input="cursor"] .input,
html[data-input-input-style="cursor"] .input{ caret-color: var(--accent); }

/* terminal: dark mono field + `>` prompt marker */
html[data-input="terminal"] .composer,
html[data-input-input-style="terminal"] .composer{
  background: var(--code-bg);
  font-family: var(--font-mono);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-xs);
}
html[data-input="terminal"] .composer::before,
html[data-input-input-style="terminal"] .composer::before{
  content: ">"; color: var(--accent); font-family: var(--font-mono);
  font-weight: 700; align-self: center; flex-shrink: 0; user-select: none;
}
html[data-input="terminal"] .composer textarea,
html[data-input-input-style="terminal"] .composer textarea{
  font-family: var(--font-mono); caret-color: var(--accent);
}
html[data-input="terminal"] .input,
html[data-input-input-style="terminal"] .input{ font-family: var(--font-mono); background: var(--code-bg); }

/* chatgpt: rounded with light border + subtle shadow */
html[data-input="chatgpt"] .composer,
html[data-input-input-style="chatgpt"] .composer{
  border-radius: var(--radius-xl);
  border: 1px solid color-mix(in srgb, var(--text) 10%, var(--border));
  box-shadow: var(--shadow-sm);
  background: var(--surface-solid);
}
html[data-input="chatgpt"] .composer:focus-within,
html[data-input-input-style="chatgpt"] .composer:focus-within{
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
  box-shadow: var(--shadow-md);
}

/* elevated: raised shadow, distinct surface */
html[data-input="elevated"] .composer,
html[data-input-input-style="elevated"] .composer{
  background: var(--surface-solid);
  border-color: color-mix(in srgb, var(--border) 90%, transparent);
  box-shadow: 0 1px 2px rgba(0,0,0,.08), 0 18px 40px -12px rgba(0,0,0,.35);
}
html[data-input="elevated"] .composer:focus-within,
html[data-input-input-style="elevated"] .composer:focus-within{
  box-shadow: var(--shadow-glow), 0 18px 40px -12px rgba(0,0,0,.35);
}

/* ============ 18. CURSOR DEDUPE ============
   The modern follower is #vertex-cursor-follower / #vertex-cursor-tail /
   #vertex-cursor-label injected by cursor-effects.js. The legacy
   #vertex-cursor renderer must never paint a second dot: force it hidden
   (this override is appended AFTER the old rules, so it always wins). */
#vertex-cursor{ display: none !important; }

/* New follower styling is lightweight + token-driven. */
[data-cursor-follower], #vertex-cursor-follower{
  position: fixed; top: 0; left: 0; z-index: 99999; pointer-events: none;
  border-radius: 50%; transition: transform var(--dur-1) var(--ease);
}
html[data-cursor-style="dot"] [data-cursor-follower],
html[data-cursor-style="minimal"] [data-cursor-follower]{
  width: 10px; height: 10px; background: var(--accent);
}
html[data-cursor-style="ring"] [data-cursor-follower]{
  width: 26px; height: 26px; border: 2px solid var(--accent); background: transparent;
}
html[data-cursor-style="glass"] [data-cursor-follower]{
  width: 16px; height: 16px; border: 1px solid color-mix(in srgb, var(--text) 40%, transparent);
  background: color-mix(in srgb, var(--text) 8%, transparent);
  backdrop-filter: blur(2px); -webkit-backdrop-filter: blur(2px);
}
html[data-cursor-style="neon"] [data-cursor-follower]{
  width: 10px; height: 10px; background: var(--accent);
  box-shadow: 0 0 12px var(--accent), 0 0 30px var(--accent);
}
html[data-cursor-style="system"] [data-cursor-follower]{ display: none !important; }

/* ============ 19. PARTICLES HOST ============ */
#vertex-particles{
  position: fixed; inset: 0; width: 100vw; height: 100vh;
  pointer-events: none; z-index: 2; display: block;
}
html[data-fx-particle="none"] #vertex-particles,
html[data-data-fx-particle="none"] #vertex-particles,
html[data-particles="false"] #vertex-particles{ display: none !important; }

/* ============ 20. GALLERIES (presets + wallpapers) ============ */
.gallery-grid{
  display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 14px;
}
.gallery-card{
  position: relative; overflow: hidden; cursor: pointer; user-select: none;
  border-radius: var(--radius-lg); border: 1px solid var(--border);
  background: var(--surface-solid); box-shadow: var(--shadow-xs);
  transition: transform var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease),
    box-shadow var(--dur-2) var(--ease);
}
.gallery-card:hover{
  transform: translateY(-3px); border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
  box-shadow: var(--shadow-md);
}
.gallery-card.gallery-selected{
  border-color: var(--accent); box-shadow: var(--shadow-glow), var(--shadow-sm);
}
.gallery-card.dragging{ opacity: .6; }
.gallery-thumb{
  height: 100px; border-bottom: 1px solid var(--border-light);
  display: flex; align-items: center; justify-content: center; overflow: hidden;
  background: var(--bg);
}
.gallery-thumb img{ width: 100%; height: 100%; object-fit: cover; display: block; }
.gallery-thumb .thumb-chip{
  width: 44px; height: 44px; border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
.gallery-meta{
  display: flex; align-items: center; gap: 8px; padding: 10px 12px;
}
.gallery-name{
  flex: 1; min-width: 0; font-size: var(--fs-base); font-weight: 600; color: var(--text);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.gallery-sub{ font-size: var(--fs-xs); color: var(--text-faint); margin-top: 2px; }
.gallery-fav{
  width: 26px; height: 26px; border-radius: var(--radius-xs); border: none;
  background: transparent; color: var(--text-faint); cursor: pointer; font-size: 14px;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
  transition: all var(--dur-1) var(--ease);
}
.gallery-fav:hover{ color: var(--accent); transform: scale(1.15); }
.gallery-fav.active{ color: var(--accent); }
.gallery-fav.active::before, .gallery-fav.faved::before{ content: "★"; color: var(--accent); }

/* wallpaper thumbs are square-ish, presets landscape */
.wallpaper-grid{ grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
.wallpaper-grid .gallery-thumb{ height: 110px; }
.wallpaper-fav-grid{ display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 10px; }

/* ============ 21. CUSTOM CSS EDITOR ============ */
.custom-css-editor{
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  background: var(--surface-solid); overflow: hidden; box-shadow: var(--shadow-xs);
}
.css-toolbar{
  display: flex; align-items: center; gap: 8px; padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.css-toolbar .css-status{ margin-left: auto; font-size: var(--fs-xs); color: var(--text-faint); }
.css-toolbar .css-status.ok{ color: var(--success); }
.css-toolbar .css-status.err{ color: var(--danger); }
.css-pane-wrap{ display: flex; min-height: 280px; }
.css-line-gutter{
  width: 52px; flex-shrink: 0; padding: 12px 10px 12px 0; text-align: right;
  font-family: var(--font-mono); font-size: 12px; line-height: 1.6;
  color: var(--text-faint); background: color-mix(in srgb, var(--bg) 55%, transparent);
  border-right: 1px solid var(--border-light); user-select: none; overflow: hidden;
}
.css-textarea{
  flex: 1; min-width: 0; padding: 12px 14px; border: none; outline: none; resize: none;
  background: transparent; color: var(--text); font-family: var(--font-mono);
  font-size: 12.5px; line-height: 1.6; min-height: 280px;
  caret-color: var(--accent);
}
.css-textarea:focus{ box-shadow: none; }
.css-preview-pane{
  display: none; flex: 1; min-width: 0; padding: 16px; overflow: auto; align-items: flex-start;
}
.css-split .css-pane-wrap{ flex-direction: row; }
.css-split .css-textarea{ width: 50%; }
.css-split .css-preview-pane{ display: flex; width: 50%; border-left: 1px solid var(--border); }
.css-error-note{ padding: 10px 14px; font-size: var(--fs-xs); color: var(--danger); border-top: 1px solid var(--border); }

/* ============ 22. LIVE PREVIEW PANEL ============ */
.lp-window{
  position: relative; border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid var(--border); box-shadow: var(--shadow-md);
  background: var(--bg); display: flex; height: 340px;
}
.lp-sidebar{
  width: 84px; flex-shrink: 0; border-right: 1px solid var(--border);
  background: var(--bg-elevated); padding: 12px 8px; display: flex; flex-direction: column;
  gap: 8px;
}
.lp-sidebar .lp-dot{ width: 8px; height: 8px; border-radius: 50%; background: var(--border-strong); }
.lp-sidebar .lp-dot.active{ background: var(--accent); }
.lp-main{ flex: 1; min-width: 0; display: flex; flex-direction: column; }
.lp-topbar{
  height: 40px; flex-shrink: 0; display: flex; align-items: center; gap: 8px;
  padding: 0 12px; border-bottom: 1px solid var(--border); background: var(--bg-elevated);
}
.lp-topbar .lp-crumb{ font-size: var(--fs-xs); color: var(--text-faint); }
.lp-topbar .lp-crumb.active{ color: var(--accent); font-weight: 600; }
.lp-chat{ flex: 1; min-height: 0; padding: 12px; display: flex; flex-direction: column; gap: 8px; overflow: hidden; }
.lp-msg{
  max-width: 80%; border-radius: var(--radius-md); padding: 8px 12px;
  font-size: var(--fs-sm); line-height: 1.5;
}
.lp-msg.lp-assistant{
  align-self: flex-start; background: var(--surface-solid); border: 1px solid var(--border);
}
.lp-msg.lp-user{
  align-self: flex-end; background: color-mix(in srgb, var(--accent) 14%, var(--surface-solid));
  border: 1px solid color-mix(in srgb, var(--accent) 26%, var(--border));
}
.lp-composer{
  display: flex; align-items: center; gap: 8px; margin: 0 12px 12px;
  padding: 8px 10px; border-radius: var(--radius-full);
  background: var(--surface); border: 1px solid var(--border);
}
.lp-composer .lp-input-slot{ flex: 1; height: 8px; border-radius: 4px; background: var(--border-strong); }
.lp-btn{
  width: 26px; height: 26px; border-radius: 50%; flex-shrink: 0;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
.lp-card{
  border-radius: var(--radius-md); border: 1px solid var(--border);
  background: var(--surface-solid); padding: 10px 12px; box-shadow: var(--shadow-xs);
  display: flex; flex-direction: column; gap: 6px;
}
.lp-card .lp-line{ height: 6px; border-radius: 3px; background: color-mix(in srgb, var(--text-faint) 30%, transparent); }
.lp-card .lp-line.w70{ width: 70%; }
.lp-card .lp-line.w45{ width: 45%; }
.lp-card .lp-acc-dot{ width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }

/* honor reduced motion for v3 animations */
@media (prefers-reduced-motion: reduce){
  .gallery-card, .lp-window, .custom-css-editor{ transition: none; }
}

/* ============================== END v3 UI EXPANSION ============================== */

/* ---- rich web result cards ---- */
.vertex-rich-results{margin-top:14px;display:grid;gap:12px;width:min(100%,780px)}
.rich-card{border:1px solid var(--border);background:color-mix(in srgb,var(--surface) 88%,transparent);border-radius:16px;padding:12px;overflow:hidden;box-shadow:0 8px 30px rgba(0,0,0,.10)}
.rich-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}.rich-kicker{font-size:10px;letter-spacing:.12em;font-weight:700;color:var(--accent)}.rich-count{font-size:11px;color:var(--text-faint)}
.rich-video-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.rich-video{min-width:0}.rich-video-frame{aspect-ratio:16/9;border-radius:10px;overflow:hidden;background:#000;border:1px solid var(--border)}.rich-video-frame iframe{width:100%;height:100%;border:0}.rich-video-title{font-size:12px;font-weight:600;line-height:1.35;margin:8px 2px 4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.rich-source-link{font-size:11px;color:var(--accent);text-decoration:none}.rich-source-link:hover{text-decoration:underline}
.rich-image-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.rich-image{display:block;overflow:hidden;border:1px solid var(--border);border-radius:12px;background:var(--bg-elevated);color:var(--text);text-decoration:none}.rich-image img{width:100%;aspect-ratio:4/3;display:block;object-fit:cover;background:var(--surface-hover)}.rich-image span{display:block;padding:8px;font-size:11px;line-height:1.3;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.weather-main{display:flex;justify-content:space-between;gap:18px;align-items:center}.weather-place{font-size:13px;color:var(--text-faint)}.weather-temp{font-size:40px;line-height:1;font-weight:700;letter-spacing:-.04em;margin:5px 0}.weather-desc{font-size:12px;color:var(--text-dim)}.weather-meta{display:grid;gap:6px;text-align:right;font-size:11px;color:var(--text-faint)}.weather-days{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:14px}.weather-day{padding:9px;border:1px solid var(--border);border-radius:10px;display:grid;gap:4px;background:var(--bg-elevated)}.weather-day b{font-size:11px}.weather-day span,.weather-day small{font-size:10px;color:var(--text-faint)}.weather-day strong{font-size:12px}
.source-list{display:grid;gap:5px}.source-row{display:grid;grid-template-columns:100px minmax(0,1fr) 20px;gap:9px;align-items:center;padding:8px;border-radius:9px;color:var(--text);text-decoration:none;border:1px solid transparent}.source-row:hover{background:var(--surface-hover);border-color:var(--border)}.source-domain{font-size:10px;color:var(--accent);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.source-title{font-size:11px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.source-open{font-size:13px;color:var(--text-faint);text-align:right}
@media (max-width:760px){.rich-video-grid,.rich-image-grid{grid-template-columns:1fr}.weather-main{align-items:flex-start;flex-direction:column}.weather-meta{text-align:left}.weather-days{grid-template-columns:1fr}.source-row{grid-template-columns:80px minmax(0,1fr) 16px}}
/* Sidebar animation must never be defeated by display:none on desktop. */
@media (min-width:761px){.sidebar.hidden{display:flex!important;width:var(--sidebar-w-collapsed);opacity:1;transform:none}.sidebar.hidden .wordmark,.sidebar.hidden .label-text,.sidebar.hidden .nav-group-title,.sidebar.hidden .user-chip .who,.sidebar.hidden .user-chip .chevron,.sidebar.hidden .badge,.sidebar.hidden .nav-search{display:none}.sidebar.hidden .nav-item,.sidebar.hidden .chat-item{justify-content:center;padding:0}.sidebar.hidden .sidebar-header{justify-content:center;gap:0}.sidebar.hidden .collapse-btn{transform:rotate(180deg)}}
.sidebar{will-change:width,transform;transition:width var(--dur-3) var(--ease),transform var(--dur-3) var(--ease),opacity var(--dur-2) ease}

.web-result-list{display:grid;gap:4px}.web-result-row{display:grid;grid-template-columns:minmax(0,1fr) 20px;gap:10px;padding:10px;border-radius:10px;color:var(--text);text-decoration:none;border:1px solid transparent}.web-result-row:hover{background:var(--surface-hover);border-color:var(--border)}.web-result-title{font-size:12.5px;font-weight:650;line-height:1.35}.web-result-domain{font-size:10px;color:var(--accent);margin-top:3px}.web-result-snippet{font-size:11px;color:var(--text-faint);line-height:1.45;margin-top:4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* AI orchestration controls */
.composer-context{display:flex;align-items:center;gap:7px;padding:9px 10px 2px;min-height:34px}
.composer-pill{appearance:none;border:1px solid var(--border);background:var(--surface);color:var(--text-dim);
  border-radius:999px;padding:5px 9px;font:500 11px/1 var(--font-ui);display:inline-flex;align-items:center;gap:5px;
  cursor:pointer;transition:background var(--dur-1) var(--ease),border-color var(--dur-1) var(--ease),color var(--dur-1) var(--ease)}
.composer-pill:hover{background:var(--surface-hover);color:var(--text);border-color:var(--border-strong)}
.composer-pill .pill-dot{width:6px;height:6px;border-radius:50%;background:var(--success);box-shadow:0 0 0 3px color-mix(in srgb,var(--success) 12%,transparent)}
.composer-pill .pill-chevron{font-size:12px;color:var(--text-faint);margin-left:1px}
.composer-pill.active{color:var(--text);border-color:color-mix(in srgb,var(--accent) 30%,var(--border))}
@media(max-width:620px){.composer-context{overflow-x:auto;scrollbar-width:none}.composer-context::-webkit-scrollbar{display:none}.composer-pill{flex:0 0 auto}}

/* Memory section: expandable summaries */
.memory-summary-head{ cursor: pointer; }
.memory-summary-head .chev{
  display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0;
  width: 22px; height: 22px; color: var(--text-faint);
  transition: transform var(--dur-2) var(--ease), color var(--dur-1) var(--ease);
}
.memory-summary-head:hover .chev{ color: var(--accent); }
.memory-summary-card.open .memory-summary-head .chev{ transform: rotate(180deg); color: var(--accent); }
.memory-summary-text{ max-height: 4.65em; overflow: hidden; transition: max-height var(--dur-2) var(--ease); }
.memory-summary-card.open .memory-summary-text{ max-height: none; overflow: visible; }
.memory-summary-more{ font-size: 11px; font-weight: 600; color: var(--accent); margin-top: 5px; }
.memory-summary-more::after{ content: "Show more"; }
.memory-summary-card.open .memory-summary-more::after{ content: "Show less"; }
.memory-stat-chips{ margin-bottom: 10px; }

/* Provider UI controls shared with standalone /settings page */
.provider-keys-add-btn{appearance:none;border:1px solid var(--border);background:var(--surface-solid,var(--surface));color:var(--text);}
.provider-keys-add-btn:hover{border-color:var(--accent);background:var(--surface-hover);}
.provider-prompt-panel{display:none;margin-top:10px;padding:10px 12px;border:1px solid var(--border);border-radius:10px;background:var(--surface);}
.provider-prompt-panel.open{display:block;}
.provider-prompt-toggle{appearance:none;border:1px dashed var(--border);background:transparent;color:var(--text-dim);border-radius:9px;padding:8px 10px;cursor:pointer;font:600 12px/1.2 inherit;}
.provider-prompt-toggle:hover{background:var(--surface-hover);color:var(--text);}
.provider-prompt-btn{border-color:color-mix(in srgb,var(--accent) 45%,var(--border));}
.provider-prompt-btn:hover{background:color-mix(in srgb,var(--accent) 10%,transparent);}

/* Shared User Provider modal: hidden until explicitly opened. It must sit above the in-page Settings modal. */
#provider-key-modal{display:none !important;z-index:10050;}
#provider-key-modal.open{display:flex !important;}