/* ============================================================================
   Web App Blueprint · Design System
   ----------------------------------------------------------------------------
   Single-file CSS framework for the shell and content pages. Organized as:
     1. THEME         → user-overridable brand tokens (edit these to re-skin)
     2. TOKENS        → derived design tokens (colours, spacing, radii, type)
     3. BASE          → reset, typography, html/body, icons, scrollbars
     4. PRIMITIVES    → buttons, chips, inputs, avatars, icon-btn
     5. SHELL         → topbar, workspace, left/right/bottom panels, footer
     6. PAGE: CANVAS  → main app canvas wireframe styles
     7. PAGE: CHANGELOG → vercel-style release notes
     8. MOBILE NAV    → bottom nav bar (mobile only)
     9. RESPONSIVE    → tablet & mobile breakpoints
   ============================================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ============================================================================
   1. THEME — override any of these on :root to re-skin the entire app.
   ---------------------------------------------------------------------------
   Example (drop in your page to customise):

       <style>
         :root {
           --primary:   221 83% 53%;
           --accent:    221 83% 53%;
           --radius:    0.75rem;
           --font-sans: 'Inter', sans-serif;
         }
       </style>

   Colours are stored as HSL triplets (no hsl() wrapper) so opacity works:
     background: hsl(var(--primary) / 0.15);
   ============================================================================ */
:root {
  /* ── Brand (edit me) ─────────────────────── */
  --primary:              240 5.9% 10%;     /* dark near-black        */
  --primary-foreground:   0 0% 98%;         /* text on --primary      */
  --accent:               240 4.8% 95.9%;   /* muted accent surface   */
  --accent-foreground:    240 5.9% 10%;
  --info:                 217 91% 50%;      /* links / focus highlight */

  /* ── Typography (edit me) ────────────────── */
  --font-sans: 'Geist', ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: 'Geist Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  /* ── Radius scale (edit --radius to rescale) */
  --radius: 0.5rem;

  /* ============================================================================
     2. DERIVED TOKENS — built from theme above. Generally no need to edit.
     ============================================================================ */

  /* Surfaces & text (shadcn neutral palette) */
  --background:           0 0% 100%;
  --foreground:           240 10% 3.9%;
  --card:                 0 0% 100%;
  --card-foreground:      240 10% 3.9%;
  --popover:              0 0% 100%;
  --popover-foreground:   240 10% 3.9%;
  --secondary:            240 4.8% 95.9%;
  --secondary-foreground: 240 5.9% 10%;
  --muted:                240 4.8% 95.9%;
  --muted-foreground:     240 3.8% 46.1%;
  --destructive:          0 72% 51%;
  --destructive-foreground: 0 0% 98%;
  --border:               240 5.9% 90%;
  --input:                240 5.9% 90%;
  --ring:                 240 5% 64.9%;

  /* Status */
  --success:              142 65% 30%;
  --success-bg:           142 60% 94%;
  --warning:              32 85% 32%;
  --warning-bg:           38 88% 93%;
  --info-bg:              214 95% 95%;

  /* Backwards-compatible aliases used throughout */
  --bg:        hsl(var(--background));
  --surface:   hsl(var(--card));
  --muted-bg:  hsl(var(--muted));
  --border-c:  hsl(var(--border));
  --border-2:  hsl(240 5.9% 84%);
  --text-1:    hsl(var(--foreground));
  --text-2:    hsl(var(--muted-foreground));
  --text-3:    hsl(240 4% 64%);
  --accent-c:    hsl(var(--primary));
  --accent-lt: hsl(var(--accent));
  --brand:     hsl(var(--primary));
  --brand-lt:  hsl(var(--accent));
  --overlay:   hsl(240 10% 3.9% / 0.45);

  /* Status semantic */
  --green-bg:  hsl(var(--success-bg)); --green-bd: hsl(142 55% 78%); --green-tx: hsl(var(--success));
  --amber-bg:  hsl(var(--warning-bg)); --amber-bd: hsl(35 85% 72%);  --amber-tx: hsl(var(--warning));
  --red-bg:    hsl(0 88% 95%);         --red-bd:   hsl(0 78% 82%);   --red-tx:   hsl(0 72% 42%);
  --blue-bg:   hsl(var(--info-bg));    --blue-bd:  hsl(214 90% 80%); --blue-tx:  hsl(217 91% 45%);
  --violet-bg: hsl(262 85% 96%);       --violet-bd:hsl(262 75% 82%); --violet-tx:hsl(262 70% 46%);

  /* ── Layout ──────────────────────────────── */
  --panel-w:       240px;
  --panel-w-rail:   52px;
  --right-w:       300px;
  --topbar-h:       52px;
  --mobile-nav-h:   68px;

  /* ── Spacing ─────────────────────────────── */
  --sp-1:  4px;  --sp-2:  6px;  --sp-3:  8px;
  --sp-4: 10px;  --sp-5: 12px;  --sp-6: 16px; --sp-7: 20px;

  /* ── Radius (shadcn: --radius 0.5rem) ────── */
  --radius:    0.5rem;
  --r-xs: calc(var(--radius) - 6px); /* 2px */
  --r-sm: calc(var(--radius) - 4px); /* 4px */
  --r-md: calc(var(--radius) - 2px); /* 6px */
  --r-lg: var(--radius);             /* 8px */
  --r-xl: calc(var(--radius) + 4px); /* 12px */
  --r-pill: 999px;

  /* ── Component heights ───────────────────── */
  --h-btn:      32px;
  --h-btn-sm:   28px;
  --h-input:    32px;
  --h-chip:     20px;
  --h-nav:      32px;
  --h-row:      36px;
  --h-thead:    36px;
  --h-tab:      36px;
  --h-panel-hd: 44px;

  /* ── Typography ──────────────────────────── */
  --fs-xs: 11px; --fs-sm: 12px; --fs-md: 13px; --fs-lg: 14px; --fs-xl: 15px;
  --lh: 1.5;

  /* ── Shadows (shadcn-ish) ────────────────── */
  --shadow-sm: 0 1px 2px 0 hsl(240 10% 3.9% / 0.05);
  --shadow:    0 1px 3px 0 hsl(240 10% 3.9% / 0.08), 0 1px 2px -1px hsl(240 10% 3.9% / 0.06);
  --shadow-md: 0 4px 6px -1px hsl(240 10% 3.9% / 0.08), 0 2px 4px -2px hsl(240 10% 3.9% / 0.05);
  --shadow-lg: 0 10px 15px -3px hsl(240 10% 3.9% / 0.08), 0 4px 6px -4px hsl(240 10% 3.9% / 0.05);

  /* ── Transitions ─────────────────────────── */
  --t-panel: 220ms cubic-bezier(.4,0,.2,1);
  --t-fast:  150ms cubic-bezier(.4,0,.2,1);
}

/* ============================================================================
   DARK THEME — official shadcn dark mode tokens.
   Activated by setting data-theme="dark" on <html>. All downstream aliases
   pick up the new values automatically because they use var() references.
   ============================================================================ */
[data-theme="dark"] {
  --background:           240 10% 3.9%;
  --foreground:           0 0% 98%;
  --card:                 240 10% 3.9%;
  --card-foreground:      0 0% 98%;
  --popover:              240 10% 3.9%;
  --popover-foreground:   0 0% 98%;
  --primary:              0 0% 98%;
  --primary-foreground:   240 5.9% 10%;
  --secondary:            240 3.7% 15.9%;
  --secondary-foreground: 0 0% 98%;
  --muted:                240 3.7% 15.9%;
  --muted-foreground:     240 5% 64.9%;
  --accent:               240 3.7% 15.9%;
  --accent-foreground:    0 0% 98%;
  --destructive:          0 62.8% 30.6%;
  --destructive-foreground: 0 0% 98%;
  --border:               240 3.7% 15.9%;
  --input:                240 3.7% 15.9%;
  --ring:                 240 4.9% 83.9%;

  /* Status (dimmed for dark background) */
  --success:              142 65% 58%;
  --success-bg:           142 55% 13%;
  --warning:              38 95% 62%;
  --warning-bg:           35 70% 13%;
  --info:                 217 92% 62%;
  --info-bg:              217 70% 14%;

  /* Aliases that were hard-coded in light mode */
  --border-2:  hsl(240 3.7% 25%);
  --text-3:    hsl(240 5% 55%);
  --overlay:   hsl(0 0% 0% / 0.6);

  /* Status chip border/bg overrides */
  --green-bd: hsl(142 40% 26%);
  --amber-bd: hsl(35 55% 26%);
  --red-bd:   hsl(0 55% 30%);
  --blue-bd:  hsl(217 55% 30%);
  --red-bg:   hsl(0 60% 13%);
  --violet-bg: hsl(262 55% 15%);
  --violet-bd: hsl(262 50% 30%);
  --violet-tx: hsl(262 85% 72%);
}

/* Canvas area dot-grid inverts in dark mode */
[data-theme="dark"] .canvas-area {
  background-color: hsl(240 6% 7%);
  background-image: radial-gradient(circle, hsl(240 5% 18%) 1px, transparent 1px);
}
[data-theme="dark"] .c-sidenav { background: hsl(240 6% 8%); }
[data-theme="dark"] .c-thead   { background: hsl(240 6% 8%); }
[data-theme="dark"] .cl-hero {
  background: hsl(240 6% 7%);
  background-image: radial-gradient(circle, hsl(240 5% 18%) 1px, transparent 1px);
}
[data-theme="dark"] .cl-footer-alt,
[data-theme="dark"] .changelog-area { background: hsl(var(--background)); }

/* Theme toggle icon visibility */
.theme-toggle .theme-icon-light { display: none; }
.theme-toggle .theme-icon-dark  { display: block; }
[data-theme="dark"] .theme-toggle .theme-icon-light { display: block; }
[data-theme="dark"] .theme-toggle .theme-icon-dark  { display: none; }

html, body { height: 100%; }
body {
  font-family: var(--font-sans);
  font-size: var(--fs-md);
  line-height: var(--lh);
  background: var(--bg);
  color: var(--text-1);
  height: 100vh;           /* fallback */
  height: 100svh;          /* small — never overflows mobile chrome */
  height: 100dvh;          /* dynamic — expands/shrinks with address bar */
  display: flex;
  flex-direction: column;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: -0.005em;
  /* iOS rubber-band and touch tweaks */
  overscroll-behavior: none;
  -webkit-text-size-adjust: 100%;
}
/* Lock background scroll while a mobile drawer is open */
body.drawer-open { overflow: hidden; touch-action: none; }

/* Lucide-style icons */
.icon {
  width: 16px; height: 16px;
  stroke: currentColor; fill: none;
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
  flex-shrink: 0;
}
.icon-sm { width: 14px; height: 14px; }
.icon-xs { width: 12px; height: 12px; }

button { font-family: inherit; }

/* ══════════════════════════════════════════════
   TOPBAR
══════════════════════════════════════════════ */
.topbar {
  height: var(--topbar-h);
  background: var(--surface);
  border-bottom: 1px solid var(--border-c);
  display: flex;
  align-items: center;
  padding: 0 var(--sp-6);
  padding-left: calc(var(--sp-6) + env(safe-area-inset-left, 0px));
  padding-right: calc(var(--sp-6) + env(safe-area-inset-right, 0px));
  gap: var(--sp-3);
  flex-shrink: 0;
  z-index: 100;
}
.topbar-logo {
  font-size: var(--fs-lg); font-weight: 600; letter-spacing: -.02em;
  color: var(--text-1);
  display: flex; align-items: center; gap: var(--sp-3);
  margin-right: var(--sp-2);
}
.logo-mark {
  width: 26px; height: 26px;
  background: hsl(var(--primary)); border-radius: var(--r-md);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
  color: hsl(var(--primary-foreground));
}
.logo-mark svg { width: 14px; height: 14px; }
.topbar-divider { width: 1px; height: 20px; background: var(--border-c); margin: 0 var(--sp-1); flex-shrink: 0; }
.breadcrumb {
  display: flex; align-items: center; gap: var(--sp-2);
  font-size: var(--fs-md); color: var(--text-3); line-height: 1;
}
.breadcrumb span { color: var(--text-2); font-weight: 400; }
.breadcrumb span:last-child { color: var(--text-1); font-weight: 500; }
.topbar-spacer { flex: 1; }
.topbar-search {
  height: var(--h-btn); width: 220px;
  background: var(--surface); border: 1px solid var(--border-c); border-radius: var(--r-md);
  display: flex; align-items: center; gap: var(--sp-3);
  padding: 0 var(--sp-4);
  font-size: var(--fs-md); color: var(--text-3); cursor: text;
  transition: border-color var(--t-fast), box-shadow var(--t-fast); flex-shrink: 0;
}
.topbar-search:hover { border-color: var(--border-2); }
.topbar-search:focus-within { border-color: hsl(var(--ring)); box-shadow: 0 0 0 3px hsl(var(--ring) / 0.15); }
.topbar-search .kbd {
  margin-left: auto;
  font-family: var(--font-mono); font-size: 10px;
  color: var(--text-3);
  border: 1px solid var(--border-c); border-radius: var(--r-sm);
  padding: 1px 5px; background: var(--muted-bg);
  line-height: 1;
}

/* Buttons (shadcn) */
.btn {
  height: var(--h-btn); padding: 0 var(--sp-5);
  border: 1px solid transparent; background: transparent;
  border-radius: var(--r-md);
  font-family: inherit; font-size: var(--fs-md); font-weight: 500; line-height: 1;
  color: var(--text-1); cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center; gap: var(--sp-2);
  transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast), box-shadow var(--t-fast), opacity var(--t-fast);
  white-space: nowrap; flex-shrink: 0;
  user-select: none;
  text-decoration: none;
}
a.btn, a.btn:hover, a.btn:visited { text-decoration: none; color: var(--text-1); }
a.btn-primary, a.btn-primary:hover, a.btn-primary:visited { color: hsl(var(--primary-foreground)); }
.btn:focus-visible { outline: none; box-shadow: 0 0 0 2px var(--surface), 0 0 0 4px hsl(var(--ring) / 0.5); }
.btn-outline {
  background: var(--surface); border-color: var(--border-c); color: var(--text-1);
  box-shadow: var(--shadow-sm);
}
.btn-outline:hover { background: var(--muted-bg); }
.btn-ghost { color: var(--text-2); }
.btn-ghost:hover { background: var(--muted-bg); color: var(--text-1); }
.btn-primary {
  background: hsl(var(--primary)); color: hsl(var(--primary-foreground));
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: hsl(var(--primary) / 0.9); }
.btn-sm { height: var(--h-btn-sm); padding: 0 var(--sp-4); font-size: var(--fs-sm); }
.btn-icon { width: var(--h-btn); padding: 0; }
.btn-icon.btn-sm { width: var(--h-btn-sm); }

/* Mobile visibility utility — apply to non-essential topbar items */
.hide-mobile { /* visible by default; hidden at ≤640px (see responsive block) */ }

.avatars { display: flex; align-items: center; }
.avatar {
  width: 28px; height: 28px; border-radius: var(--r-pill);
  border: 2px solid var(--surface); margin-left: -8px;
  font-size: var(--fs-xs); font-weight: 600; line-height: 1;
  display: flex; align-items: center; justify-content: center;
  color: #fff; flex-shrink: 0;
}
.avatars .avatar:first-child { margin-left: 0; }

/* ══════════════════════════════════════════════
   WORKSPACE SHELL
══════════════════════════════════════════════ */
.workspace { flex: 1; display: flex; overflow: hidden; position: relative; }

/* OVERLAY */
.overlay {
  display: none;
  position: fixed; inset: 0; z-index: 49;
  height: 100dvh;
  background: var(--overlay); opacity: 0;
  transition: opacity var(--t-panel);
  backdrop-filter: blur(2px);
}
.overlay.visible { opacity: 1; }

/* ══════════════════════════════════════════════
   SHARED PANEL PRIMITIVES
══════════════════════════════════════════════ */
.panel-hd {
  height: var(--h-panel-hd);
  display: flex; align-items: center;
  padding: 0 var(--sp-6);
  border-bottom: 1px solid var(--border-c);
  gap: var(--sp-2); flex-shrink: 0;
  cursor: pointer;
  user-select: none;
  transition: background var(--t-fast);
}
.panel-hd:hover { background: var(--muted-bg); }
.panel-hd-title {
  font-size: var(--fs-sm); font-weight: 600;
  color: var(--text-2); letter-spacing: 0;
  flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: var(--fs-xs);
}
.panel-hd-chevron {
  width: 18px; height: 18px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-3);
  flex-shrink: 0;
  transition: transform var(--t-panel);
}

.icon-btn {
  width: 26px; height: 26px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--r-sm); cursor: pointer;
  color: var(--text-3);
  transition: background var(--t-fast), color var(--t-fast); flex-shrink: 0;
  background: transparent; border: none;
}
.icon-btn:hover { background: var(--muted-bg); color: var(--text-1); }

/* ── Badge / chip system (shadcn badge) ────────────── */
.chip {
  height: var(--h-chip); padding: 0 var(--sp-3);
  border-radius: var(--r-pill);
  font-size: 10.5px; font-weight: 600;
  font-family: inherit; line-height: 1;
  display: inline-flex; align-items: center; justify-content: center;
  white-space: nowrap;
  border: 1px solid transparent;
  background: var(--muted-bg); color: var(--text-2);
  flex-shrink: 0;
  transition: background var(--t-fast);
}
.chip-accent { background: hsl(var(--primary)); color: hsl(var(--primary-foreground)); }
.chip-brand  { background: hsl(var(--info-bg)); color: hsl(var(--info)); border-color: hsl(214 90% 86%); }
.chip-green  { background: var(--green-bg);  border-color: var(--green-bd); color: var(--green-tx); }
.chip-amber  { background: var(--amber-bg);  border-color: var(--amber-bd); color: var(--amber-tx); }
.chip-red    { background: var(--red-bg);    border-color: var(--red-bd);   color: var(--red-tx);   }
.chip-violet { background: var(--violet-bg); border-color: var(--violet-bd);color: var(--violet-tx);}
.chip-outline{ background: transparent; border-color: var(--border-c); color: var(--text-2); }
.chip-dot { width: 6px; height: 6px; border-radius: var(--r-pill); background: currentColor; margin-right: 6px; }

.nav-badge { margin-left: auto; }

/* Clickable logo + version */
a.topbar-logo { text-decoration: none; color: var(--text-1); }
a.topbar-logo:hover .logo-mark { opacity: 0.92; }
a.version-pill { text-decoration: none; cursor: pointer; transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast); }
a.version-pill:hover { background: var(--surface); border-color: var(--border-2); color: var(--text-1); }

/* Version pill in topbar */
.version-pill {
  font-family: var(--font-mono);
  font-size: 10.5px; font-weight: 500; line-height: 1;
  color: var(--text-2);
  background: var(--muted-bg);
  border: 1px solid var(--border-c);
  border-radius: var(--r-pill);
  padding: 3px 8px;
  letter-spacing: -0.01em;
}

/* ══════════════════════════════════════════════
   FOOTER (slim, app-wide)
══════════════════════════════════════════════ */
.app-footer {
  height: 32px;
  flex-shrink: 0;
  background: var(--surface);
  border-top: 1px solid var(--border-c);
  display: flex; align-items: center;
  padding: 0 var(--sp-6);
  gap: var(--sp-5);
  font-size: var(--fs-xs); color: var(--text-3);
  z-index: 99;
}
.app-footer a {
  color: var(--text-2); text-decoration: none; font-weight: 500;
  transition: color var(--t-fast);
  display: inline-flex; align-items: center; gap: 5px;
}
.app-footer a:hover { color: var(--text-1); }
.app-footer .footer-sep { width: 1px; height: 12px; background: var(--border-c); }
.app-footer .footer-spacer { flex: 1; }
.app-footer .footer-meta {
  font-family: var(--font-mono);
  font-size: 10.5px; color: var(--text-3);
  display: inline-flex; align-items: center; gap: 6px;
}
.app-footer .footer-meta::before {
  content: ''; width: 6px; height: 6px; border-radius: var(--r-pill);
  background: var(--green-tx);
}

/* ══════════════════════════════════════════════
   LEFT PANEL
══════════════════════════════════════════════ */
.panel-left {
  width: var(--panel-w);
  background: var(--surface);
  border-right: 1px solid var(--border-c);
  display: flex; flex-direction: column;
  flex-shrink: 0; overflow: hidden;
  transition: width var(--t-panel);
  z-index: 50;
}
.panel-left.collapsed { width: var(--panel-w-rail); }
.panel-left.collapsed .panel-hd-title,
.panel-left.collapsed .panel-search-wrap,
.panel-left.collapsed .nav-label,
.panel-left.collapsed .nav-item-text,
.panel-left.collapsed .nav-badge,
.panel-left.collapsed .nav-indent { display: none; }
.panel-left.collapsed .panel-hd { justify-content: center; padding: 0; }
.panel-left.collapsed .panel-hd-chevron { transform: rotate(180deg); }
.panel-left.collapsed .nav-item {
  padding: 0; justify-content: center; gap: 0;
  margin: 2px var(--sp-2);
}
.panel-left.collapsed .nav-section { margin-top: var(--sp-2); }

.panel-search-wrap { padding: var(--sp-4) var(--sp-4) var(--sp-3); }
.panel-search {
  width: 100%; height: var(--h-input);
  background: var(--surface); border: 1px solid var(--border-c); border-radius: var(--r-md);
  padding: 0 var(--sp-4);
  font-family: inherit; font-size: var(--fs-sm); color: var(--text-1);
  line-height: 1; outline: none;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.panel-search::placeholder { color: var(--text-3); }
.panel-search:focus { border-color: hsl(var(--ring)); box-shadow: 0 0 0 3px hsl(var(--ring) / 0.15); }

.panel-body { flex: 1; overflow-y: auto; overflow-x: hidden; padding: 0 var(--sp-2) var(--sp-5); }

.nav-section { margin-top: var(--sp-4); }
.nav-section:first-child { margin-top: var(--sp-2); }
.nav-label {
  padding: var(--sp-2) var(--sp-4) var(--sp-2);
  font-size: 10.5px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--text-3); line-height: var(--lh);
}
.nav-item {
  height: var(--h-nav);
  display: flex; align-items: center; gap: var(--sp-3);
  padding: 0 var(--sp-4);
  cursor: pointer; font-size: var(--fs-md); color: var(--text-2); line-height: 1;
  transition: background var(--t-fast), color var(--t-fast); position: relative;
  border-radius: var(--r-md);
  margin: 1px var(--sp-2);
  font-weight: 500;
}
.nav-item:hover { background: var(--muted-bg); color: var(--text-1); }
.nav-item.active { background: var(--accent-lt); color: var(--text-1); font-weight: 600; }
.nav-item .icon { color: var(--text-3); }
.nav-item:hover .icon, .nav-item.active .icon { color: var(--text-1); }
.nav-item-text { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav-indent { padding-left: 36px; }
.nav-item.active .chip:not(.chip-brand):not(.chip-green):not(.chip-amber):not(.chip-red) {
  background: hsl(var(--primary)); color: hsl(var(--primary-foreground));
}

/* ══════════════════════════════════════════════
   MAIN
══════════════════════════════════════════════ */
.main { flex: 1; display: flex; flex-direction: column; overflow: hidden; min-width: 0; }

/* ── Canvas ───────────────────────────────── */
.canvas-area {
  flex: 1; overflow: auto;
  display: flex; align-items: flex-start; justify-content: center;
  padding: 32px;
  background-color: hsl(240 5% 97%);
  background-image:
    radial-gradient(circle, hsl(240 5% 88%) 1px, transparent 1px);
  background-size: 24px 24px;
}
.canvas {
  width: 100%; max-width: 920px;
  background: var(--surface); border-radius: var(--r-lg);
  border: 1px solid var(--border-c);
  box-shadow: var(--shadow-md);
  overflow: hidden; display: flex; flex-direction: column;
}
.c-topbar {
  height: 52px; background: var(--surface); border-bottom: 1px solid var(--border-c);
  display: flex; align-items: center; padding: 0 var(--sp-7); gap: var(--sp-4); flex-shrink: 0;
}
.c-logo { width: 22px; height: 22px; background: hsl(var(--primary)); border-radius: var(--r-sm); opacity: .9; flex-shrink: 0; }
.c-sk    { height: 8px; border-radius: var(--r-pill); background: var(--border-c); }
.c-sk-dk { height: 8px; border-radius: var(--r-pill); background: var(--border-2); }
.c-sk-btn { height: 26px; width: 64px; background: hsl(var(--primary)); border-radius: var(--r-md); opacity: .9; flex-shrink: 0; }
.c-body { display: flex; min-height: 380px; }
.c-sidenav {
  width: 180px; border-right: 1px solid var(--border-c);
  padding: var(--sp-5) var(--sp-2); flex-shrink: 0;
  display: flex; flex-direction: column; gap: 2px;
  background: hsl(240 5% 99%);
}
.c-nav-row {
  height: 30px; border-radius: var(--r-md);
  display: flex; align-items: center; padding: 0 var(--sp-4); gap: var(--sp-3);
}
.c-nav-row.sel { background: var(--accent-lt); }
.c-dot { width: 12px; height: 12px; border-radius: var(--r-sm); background: var(--border-c); flex-shrink: 0; }
.c-nav-row.sel .c-dot { background: hsl(var(--primary)); opacity: .85; }
.c-lbl { height: 7px; border-radius: var(--r-pill); background: var(--border-c); flex: 1; }
.c-nav-row.sel .c-lbl { background: hsl(var(--primary)); opacity: .25; }
.c-content { flex: 1; padding: var(--sp-7); display: flex; flex-direction: column; gap: var(--sp-7); }
.c-title-ph { height: 14px; width: 32%; border-radius: var(--r-pill); background: var(--border-2); }
.c-cards { display: flex; gap: var(--sp-5); }
.c-card {
  flex: 1; height: 78px; border: 1px solid var(--border-c); border-radius: var(--r-lg);
  padding: var(--sp-5) var(--sp-6); display: flex; flex-direction: column; justify-content: space-between;
  background: var(--surface); box-shadow: var(--shadow-sm);
}
.c-card.hl { border-color: hsl(var(--primary)); background: hsl(var(--primary)); }
.c-card .ck-top { height: 7px; border-radius: var(--r-pill); background: var(--border-c); width: 55%; }
.c-card .ck-bot { height: 14px; border-radius: var(--r-pill); background: var(--border-2); width: 38%; }
.c-card.hl .ck-top { background: hsl(var(--primary-foreground)); opacity: .35; }
.c-card.hl .ck-bot { background: hsl(var(--primary-foreground)); opacity: .8; }
.c-table { border: 1px solid var(--border-c); border-radius: var(--r-lg); overflow: hidden; background: var(--surface); }
.c-thead {
  height: var(--h-thead); background: hsl(240 5% 98%); border-bottom: 1px solid var(--border-c);
  display: flex; align-items: center; padding: 0 var(--sp-6);
}
.c-th-ph { height: 7px; border-radius: var(--r-pill); background: var(--border-2); }
.c-trow {
  height: var(--h-row); display: flex; align-items: center;
  padding: 0 var(--sp-6); border-bottom: 1px solid var(--border-c);
  transition: background var(--t-fast);
}
.c-trow:last-child { border-bottom: none; }
.c-trow:hover { background: var(--muted-bg); }
.c-trow.sel { background: var(--accent-lt); }
.c-td-ph { height: 7px; border-radius: var(--r-pill); background: var(--border-c); }
.c-pill-col { width: 80px; flex-shrink: 0; display: flex; justify-content: flex-end; margin-left: auto; }

/* ══════════════════════════════════════════════
   RIGHT PANEL
══════════════════════════════════════════════ */
.panel-right {
  width: var(--right-w);
  background: var(--surface); border-left: 1px solid var(--border-c);
  display: flex; flex-direction: column;
  flex-shrink: 0; overflow: hidden;
  transition: width var(--t-panel);
  z-index: 50;
}
.panel-right.collapsed { width: 0; border-left-width: 0; }
.panel-right.collapsed .panel-hd-chevron { transform: rotate(180deg); }

.right-collapse-tab {
  position: absolute; right: 0; top: 50%;
  transform: translateY(-50%);
  width: 28px; height: 64px;
  background: var(--surface); border: 1px solid var(--border-c);
  border-right: none; border-radius: var(--r-md) 0 0 var(--r-md);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; z-index: 51;
  color: var(--text-3);
  transition: background var(--t-fast), color var(--t-fast), opacity var(--t-panel);
  opacity: 0; pointer-events: none;
  box-shadow: var(--shadow-sm);
}
.panel-right.collapsed + .right-collapse-tab,
.workspace:has(.panel-right.collapsed) .right-collapse-tab {
  opacity: 1; pointer-events: auto;
}
.right-collapse-tab:hover { background: var(--muted-bg); color: var(--text-1); }

.right-tabs {
  height: var(--h-tab); display: flex; align-items: center;
  border-bottom: 1px solid var(--border-c); flex-shrink: 0;
  padding: 0 var(--sp-2);
}
.right-tab {
  flex: 1; height: var(--h-tab);
  display: flex; align-items: center; justify-content: center;
  font-size: var(--fs-sm); font-weight: 500; line-height: 1; color: var(--text-3);
  cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -1px;
  transition: color var(--t-fast), border-color var(--t-fast); white-space: nowrap;
}
.right-tab.active { color: var(--text-1); border-bottom-color: hsl(var(--primary)); font-weight: 600; }
.right-tab:hover  { color: var(--text-1); }

.right-body { flex: 1; overflow-y: auto; }
.right-section { border-bottom: 1px solid var(--border-c); padding: var(--sp-5) var(--sp-6); }
.right-section:last-child { border-bottom: none; }
.right-section-title {
  font-size: 10.5px; font-weight: 600; color: var(--text-3); letter-spacing: 0.06em; text-transform: uppercase;
  line-height: var(--lh); margin-bottom: var(--sp-4);
  display: flex; justify-content: space-between; align-items: center;
}
.right-section-title .chev { color: var(--text-3); cursor: pointer; line-height: 1; }
.field-row {
  display: flex; align-items: center; gap: var(--sp-3);
  margin-bottom: var(--sp-3);
}
.field-row:last-child { margin-bottom: 0; }
.field-label { font-size: var(--fs-sm); color: var(--text-2); width: 72px; flex-shrink: 0; line-height: 1; font-weight: 500; }
.field-val {
  flex: 1; height: var(--h-input);
  background: var(--surface); border: 1px solid var(--border-c);
  border-radius: var(--r-md); padding: 0 var(--sp-3);
  display: flex; align-items: center;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.field-val input {
  width: 100%; background: transparent; border: none;
  font-family: inherit; font-size: var(--fs-sm); color: var(--text-1);
  line-height: 1; outline: none;
}
.field-val:focus-within { border-color: hsl(var(--ring)); box-shadow: 0 0 0 3px hsl(var(--ring) / 0.15); }
.tag-row { display: flex; flex-wrap: wrap; gap: var(--sp-2); }
.activity-list { display: flex; flex-direction: column; gap: var(--sp-5); }
.activity-row { display: flex; align-items: flex-start; gap: var(--sp-3); }
.act-dot {
  width: 8px; height: 8px; border-radius: var(--r-pill);
  background: var(--border-2); flex-shrink: 0; margin-top: 5px;
  box-shadow: 0 0 0 3px var(--surface);
}
.act-dot.ac { background: hsl(var(--info)); }
.act-dot.br { background: var(--green-tx); }
.act-body { display: flex; flex-direction: column; gap: 2px; }
.act-text { font-size: var(--fs-sm); color: var(--text-1); line-height: var(--lh); }
.act-text strong { font-weight: 600; }
.act-time { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--text-3); line-height: var(--lh); }

/* ══════════════════════════════════════════════
   SCROLLBARS
══════════════════════════════════════════════ */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: var(--r-pill); border: 2px solid var(--surface); }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); }

/* ══════════════════════════════════════════════
   MOBILE NAV BAR
══════════════════════════════════════════════ */
.mobile-nav {
  display: none;
  height: calc(var(--mobile-nav-h) + env(safe-area-inset-bottom, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px);
  background: var(--surface);
  border-top: 1px solid var(--border-c);
  flex-shrink: 0;
  z-index: 100;
}
.mobile-nav-items { display: flex; height: 100%; width: 100%; flex: 1; }
.mobile-nav-item {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 4px;
  cursor: pointer; color: var(--text-3);
  transition: color var(--t-fast);
  font-size: 10.5px; font-weight: 500;
  -webkit-tap-highlight-color: transparent;
}
.mobile-nav-item:hover, .mobile-nav-item.active { color: var(--text-1); }
.mobile-nav-item.active .mobile-nav-icon { background: var(--accent-lt); color: var(--text-1); }
.mobile-nav-item.brand-item.active .mobile-nav-icon { background: hsl(var(--primary)); color: hsl(var(--primary-foreground)); }
.mobile-nav-icon {
  width: 32px; height: 32px; border-radius: var(--r-md);
  background: transparent;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--t-fast), color var(--t-fast);
  color: var(--text-3);
}
.mobile-nav-item.active .mobile-nav-icon { color: var(--text-1); }

/* ══════════════════════════════════════════════
   RESPONSIVE — TABLET  ≤ 900px
══════════════════════════════════════════════ */
@media (max-width: 900px) {
  .topbar-search,
  .topbar-search + .topbar-divider { display: none; }
  .breadcrumb span:not(:last-child),
  .breadcrumb .breadcrumb-sep { display: none; }
  .canvas-area { padding: 20px; }
}

/* ══════════════════════════════════════════════
   RESPONSIVE — MOBILE  ≤ 640px
══════════════════════════════════════════════ */
@media (max-width: 640px) {
  .mobile-nav { display: flex; }

  /* Footer stays visible on mobile on every page — same treatment as changelog:
     wraps to two lines when tight, comfortable tap padding.
     On pages that have a mobile-nav, footer sits *below* it via flex order. */
  .app-footer {
    display: flex; flex-wrap: wrap;
    height: auto; min-height: 40px;
    padding: var(--sp-3) var(--sp-4);
    row-gap: var(--sp-2);
    order: 2;
  }
  .mobile-nav { order: 1; }

  /* Slightly taller nav rows for comfortable taps */
  .nav-item { height: 40px; }

  .panel-left {
    position: fixed;
    left: 0; top: 0;
    bottom: calc(var(--mobile-nav-h) + env(safe-area-inset-bottom, 0px));
    width: min(86vw, 320px) !important;
    transform: translateX(-100%);
    transition: transform var(--t-panel), box-shadow var(--t-panel);
    border-right: 1px solid var(--border-c);
    z-index: 50; box-shadow: none;
    overscroll-behavior: contain;
  }
  .panel-left.mobile-open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }

  .panel-right {
    position: fixed;
    right: 0; top: 0;
    bottom: calc(var(--mobile-nav-h) + env(safe-area-inset-bottom, 0px));
    width: min(86vw, 340px) !important;
    transform: translateX(100%);
    transition: transform var(--t-panel), box-shadow var(--t-panel);
    border-left: 1px solid var(--border-c);
    z-index: 50; box-shadow: none;
    overscroll-behavior: contain;
  }
  .panel-right.mobile-open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }

  .right-collapse-tab { display: none; }
  .overlay { display: block; }

  .topbar-divider, .avatars, .breadcrumb,
  .hide-mobile { display: none !important; }

  .canvas-area { padding: 14px; }
  .c-sidenav { display: none; }
  .c-cards { flex-wrap: wrap; }
  .c-cards .c-card { min-width: calc(50% - var(--sp-3)); }
}

@media (max-width: 380px) {
  .topbar-logo span { display: none; }
  .canvas-area { padding: var(--sp-3); }
}

/* ============================================================================
   CHANGELOG PAGE
   ============================================================================ */
/* Clickable logo + version */
a.topbar-logo { text-decoration: none; color: var(--text-1); }
a.topbar-logo:hover .logo-mark { opacity: 0.92; }
a.version-pill { text-decoration: none; cursor: pointer; transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast); }
a.version-pill:hover { background: var(--surface); border-color: var(--border-2); color: var(--text-1); }

/* Changelog page main — no shell */
.changelog-main {
  flex: 1; display: flex; flex-direction: column;
  overflow: auto; min-height: 0;
}

/* ══════════════════════════════════════════════
   CHANGELOG PAGE — Vercel-style article list
══════════════════════════════════════════════ */
.changelog-area {
  flex: 1; overflow: auto;
  padding: 72px 32px 120px;
  background: var(--surface);
}
.changelog {
  max-width: 720px; margin: 0 auto;
  display: flex; flex-direction: column;
}

.cl-header {
  display: flex; flex-direction: column; gap: var(--sp-3);
  margin-bottom: 72px;
}
.cl-eyebrow {
  font-size: var(--fs-xs); font-weight: 500; color: var(--text-3);
  letter-spacing: 0.04em; text-transform: uppercase;
}
.cl-title {
  font-size: 44px; font-weight: 600; color: var(--text-1);
  letter-spacing: -0.035em; line-height: 1.05;
}
.cl-sub {
  font-size: var(--fs-lg); color: var(--text-2);
  line-height: 1.6; max-width: 560px; margin-top: var(--sp-2);
}

/* Entry */
.cl-entry {
  padding-bottom: 72px;
  margin-bottom: 72px;
  border-bottom: 1px solid var(--border-c);
}
.cl-entry:last-of-type { border-bottom: none; margin-bottom: 0; padding-bottom: 8px; }

.cl-date {
  font-size: var(--fs-md); color: var(--text-3);
  margin-bottom: var(--sp-4);
  font-family: var(--font-mono);
  letter-spacing: -0.01em;
}
.cl-entry-title {
  font-size: 28px; font-weight: 600;
  color: var(--text-1); letter-spacing: -0.025em;
  line-height: 1.2;
  margin-bottom: 24px;
  text-decoration: none;
  display: block;
  transition: color var(--t-fast);
}
.cl-entry-title:hover { color: hsl(var(--info)); }

/* Hero preview — on-theme visual */
.cl-hero {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--border-c);
  border-radius: var(--r-lg);
  background: hsl(240 5% 98%);
  background-image: radial-gradient(circle, hsl(240 5% 88%) 1px, transparent 1px);
  background-size: 18px 18px;
  display: flex; align-items: center; justify-content: center;
  padding: 28px;
  margin-bottom: 28px;
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-sm);
}
.cl-hero.dark {
  background: hsl(240 10% 10%);
  background-image: radial-gradient(circle, hsl(240 5% 22%) 1px, transparent 1px);
  border-color: hsl(240 8% 18%);
}

/* Miniature app mock inside hero */
.hero-mock {
  width: 100%; max-width: 520px;
  background: var(--surface);
  border: 1px solid var(--border-c);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  display: flex; flex-direction: column;
}
.cl-hero.dark .hero-mock { background: hsl(240 6% 14%); border-color: hsl(240 8% 22%); }

.hm-bar {
  height: 22px; display: flex; align-items: center;
  gap: 5px; padding: 0 10px;
  border-bottom: 1px solid var(--border-c);
}
.cl-hero.dark .hm-bar { border-color: hsl(240 8% 22%); }
.hm-dot { width: 7px; height: 7px; border-radius: var(--r-pill); background: var(--border-2); }
.cl-hero.dark .hm-dot { background: hsl(240 5% 28%); }
.hm-body { display: flex; min-height: 120px; }
.hm-side {
  width: 90px; border-right: 1px solid var(--border-c);
  padding: 8px 6px; display: flex; flex-direction: column; gap: 4px;
  background: hsl(240 5% 99%);
}
.cl-hero.dark .hm-side { background: hsl(240 8% 12%); border-color: hsl(240 8% 22%); }
.hm-si {
  height: 14px; border-radius: 3px;
  padding: 0 6px; display: flex; align-items: center; gap: 5px;
}
.hm-si.sel { background: var(--accent-lt); }
.cl-hero.dark .hm-si.sel { background: hsl(240 8% 22%); }
.hm-si .d { width: 5px; height: 5px; border-radius: 1.5px; background: var(--border-2); }
.cl-hero.dark .hm-si .d { background: hsl(240 5% 40%); }
.hm-si .l { flex: 1; height: 3px; border-radius: 2px; background: var(--border-c); }
.cl-hero.dark .hm-si .l { background: hsl(240 5% 30%); }
.hm-si.sel .d, .hm-si.sel .l { background: hsl(var(--primary) / 0.6); }
.cl-hero.dark .hm-si.sel .d, .cl-hero.dark .hm-si.sel .l { background: hsl(0 0% 95%); }
.hm-main {
  flex: 1; padding: 12px; display: flex; flex-direction: column; gap: 8px;
}
.hm-title { height: 6px; width: 40%; border-radius: 2px; background: var(--border-2); }
.cl-hero.dark .hm-title { background: hsl(240 5% 40%); }
.hm-cards { display: flex; gap: 6px; }
.hm-card {
  flex: 1; height: 30px; border: 1px solid var(--border-c);
  border-radius: 4px; padding: 5px 6px;
  display: flex; flex-direction: column; gap: 3px; justify-content: space-between;
  background: var(--surface);
}
.cl-hero.dark .hm-card { background: hsl(240 8% 16%); border-color: hsl(240 8% 24%); }
.hm-card.hl { background: hsl(var(--primary)); border-color: hsl(var(--primary)); }
.hm-card .t { height: 3px; width: 50%; border-radius: 2px; background: var(--border-2); }
.hm-card .b { height: 5px; width: 35%; border-radius: 2px; background: var(--border-c); }
.cl-hero.dark .hm-card .t { background: hsl(240 5% 35%); }
.cl-hero.dark .hm-card .b { background: hsl(240 5% 45%); }
.hm-card.hl .t, .hm-card.hl .b { background: hsl(var(--primary-foreground) / 0.6); }
.hm-table { display: flex; flex-direction: column; gap: 3px; margin-top: 2px; }
.hm-row {
  height: 11px; border: 1px solid var(--border-c); border-radius: 3px;
  background: var(--surface);
}
.cl-hero.dark .hm-row { background: hsl(240 8% 16%); border-color: hsl(240 8% 24%); }
.hm-row.sel { background: var(--accent-lt); border-color: var(--accent-lt); }
.cl-hero.dark .hm-row.sel { background: hsl(240 8% 24%); border-color: hsl(240 8% 30%); }

/* Body text */
.cl-body-text {
  font-size: var(--fs-lg); color: var(--text-2);
  line-height: 1.7;
  margin-bottom: var(--sp-5);
}
.cl-body-text + .cl-body-text { margin-top: -4px; }
.cl-body-text strong { color: var(--text-1); font-weight: 600; }
.cl-body-text a {
  color: hsl(var(--info)); text-decoration: none; font-weight: 500;
  border-bottom: 1px solid hsl(var(--info) / 0.3);
  transition: border-color var(--t-fast);
}
.cl-body-text a:hover { border-bottom-color: hsl(var(--info)); }
.cl-body-text code {
  font-family: var(--font-mono); font-size: 0.88em;
  background: var(--muted-bg); border: 1px solid var(--border-c);
  border-radius: var(--r-sm); padding: 1px 6px;
  color: var(--text-1);
}

/* Authors */
.cl-authors {
  display: flex; align-items: center; gap: var(--sp-4);
  margin-top: 28px;
  flex-wrap: wrap;
}
.cl-author {
  display: inline-flex; align-items: center; gap: var(--sp-3);
  font-size: var(--fs-md); color: var(--text-2); font-weight: 500;
  text-decoration: none;
  transition: color var(--t-fast);
}
.cl-author:hover { color: var(--text-1); }
.cl-author-avatar {
  width: 28px; height: 28px; border-radius: var(--r-pill);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 10.5px; font-weight: 600;
  flex-shrink: 0;
}

@media (max-width: 640px) {
  .changelog-area { padding: 32px 18px 56px; }
  .cl-title { font-size: 30px; letter-spacing: -0.03em; }
  .cl-entry-title { font-size: 20px; }
  .cl-entry { padding-bottom: 44px; margin-bottom: 44px; }
  .cl-header { margin-bottom: 44px; }
  .cl-sub { font-size: var(--fs-md); }
  .cl-body-text { font-size: var(--fs-md); line-height: 1.65; }
  .cl-hero { padding: 16px; border-radius: var(--r-md); }
  .hm-side { display: none; }
  .hm-bar { height: 18px; }
  .hm-main { padding: 8px; gap: 6px; }
  .cl-authors { gap: var(--sp-3); }

  /* Topbar shrink applies to every page */
  .topbar { padding: 0 var(--sp-4); gap: var(--sp-2); }
  .version-pill { display: none; }
}

@media (max-width: 380px) {
  .cl-title { font-size: 26px; }
  .cl-entry-title { font-size: 18px; }
  .cl-date { font-size: var(--fs-sm); }
  .changelog-area { padding: 24px 14px 48px; }
}