/* Scriptura v3 — design tokens and reading palettes
   Theme and typeface classes live on <html> so they apply before first paint.
   Palette: navy ink and lapis on porcelain by day, gold on deep indigo by night. */

:root {
  /* Reader — updated from preferences in app.js */
  --reader-font-size: 20px;
  --reader-line-height: 1.75;
  --reader-scale: 1;
  --reader-font: var(--font-text);

  /* Type: Fraunces for display, Literata for reading, Geist for interface */
  --font-display: 'Fraunces', 'Noto Serif Telugu', 'Iowan Old Style', 'Palatino Linotype', Georgia, serif;
  --font-text: 'Literata', 'Noto Serif Telugu', 'Iowan Old Style', 'Palatino Linotype', Georgia, serif;
  --font-ui: 'Geist', 'Noto Serif Telugu', system-ui, -apple-system, 'Segoe UI', sans-serif;

  /* Space (4px base) */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 20px;
  --s-6: 24px;
  --s-8: 32px;
  --s-10: 40px;
  --s-12: 48px;
  --s-16: 64px;
  --gutter: 20px;

  /* Radius — concentric: inner = outer - bezel padding */
  --r-xs: 6px;
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 22px;
  --r-xl: 30px;
  --r-pill: 999px;
  --bezel-pad: 5px;

  /* Layers */
  --z-rail: 20;
  --z-bar: 30;
  --z-tabbar: 40;
  --z-toolbar: 50;
  --z-toast: 70;
  --z-sheet: 80;

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-sheet: cubic-bezier(0.32, 0.72, 0, 1);
  --ease-spring: cubic-bezier(0.34, 1.32, 0.64, 1);
  --dur-fast: 140ms;
  --dur-base: 220ms;
  --dur-slow: 380ms;

  /* Chrome */
  --bar-h: 52px;
  --bar-gap: 10px;
  --tabbar-h: 64px;
  --rail-w: 272px;

  /* Highlight swatches (solid, for the picker buttons) */
  --sw-gold: #F0C543;
  --sw-rose: #EE8A9C;
  --sw-emerald: #5CBE8D;
  --sw-sky: #6CA0F2;
  --sw-amethyst: #A68CEC;

  --grain-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.08 0 0 0 0 0.09 0 0 0 0 0.16 0 0 0 .9 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  --grain-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 0.97 0 0 0 0 0.92 0 0 0 .9 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

@media (min-width: 640px) {
  :root { --gutter: 32px; }
}

@media (min-width: 1024px) {
  :root { --gutter: 48px; }
}

/* =====================================================================
   DAYLIGHT — porcelain, navy ink, lapis accent, gold ornament (default light)
   ===================================================================== */
.theme-parchment {
  color-scheme: light;
  --canvas: #FBFAF7;
  --surface: #F1F0EB;
  --raised: #FFFFFF;
  --ink: #151A30;
  --ink-2: #3D4257;
  --ink-3: #62677C;
  --ink-4: #A9ACBA;
  --line: rgba(21, 26, 48, 0.08);
  --line-strong: rgba(21, 26, 48, 0.15);
  --accent: #3343B0;
  --accent-ink: #FFFFFF;
  --accent-soft: rgba(51, 67, 176, 0.08);
  --accent-line: rgba(51, 67, 176, 0.28);
  --gilt: #B08226;
  --gilt-soft: rgba(176, 130, 38, 0.12);
  --toast-accent: #AEB9FF;
  --rubric: #B4232C;

  --hl-gold: rgba(244, 200, 67, 0.42);
  --hl-rose: rgba(238, 138, 156, 0.30);
  --hl-emerald: rgba(92, 190, 141, 0.28);
  --hl-sky: rgba(108, 160, 242, 0.28);
  --hl-amethyst: rgba(166, 140, 236, 0.28);

  --glass: rgba(255, 255, 255, 0.72);
  --glass-edge: rgba(255, 255, 255, 0.85);
  --bezel: rgba(21, 26, 48, 0.035);
  --scrim: rgba(12, 16, 32, 0.32);
  --shadow-sm: 0 1px 2px rgba(21, 26, 48, 0.06), 0 1px 1px rgba(21, 26, 48, 0.03);
  --shadow-md: 0 12px 32px -12px rgba(21, 26, 48, 0.20), 0 3px 8px -3px rgba(21, 26, 48, 0.07);
  --shadow-lg: 0 32px 72px -20px rgba(21, 26, 48, 0.30), 0 8px 20px -8px rgba(21, 26, 48, 0.10);
  --inner-light: inset 0 1px 0 rgba(255, 255, 255, 0.9);
  --grain: var(--grain-dark);
  --grain-opacity: 0.03;
  --art-filter: none;
}

/* =====================================================================
   VELLUM — warm paper, sepia ink, deep teal accent
   ===================================================================== */
.theme-sepia {
  color-scheme: light;
  --canvas: #F5EEE1;
  --surface: #EBE1CE;
  --raised: #FCF8F0;
  --ink: #2A2119;
  --ink-2: #57493B;
  --ink-3: #6E5F4B;
  --ink-4: #AE9D83;
  --line: rgba(60, 40, 15, 0.10);
  --line-strong: rgba(60, 40, 15, 0.19);
  --accent: #1C6168;
  --accent-ink: #FFFFFF;
  --accent-soft: rgba(28, 97, 104, 0.09);
  --accent-line: rgba(28, 97, 104, 0.30);
  --gilt: #A2731F;
  --gilt-soft: rgba(162, 115, 31, 0.13);
  --toast-accent: #8FD3D2;
  --rubric: #A12B22;

  --hl-gold: rgba(232, 184, 60, 0.42);
  --hl-rose: rgba(226, 128, 136, 0.32);
  --hl-emerald: rgba(102, 176, 128, 0.32);
  --hl-sky: rgba(104, 156, 214, 0.32);
  --hl-amethyst: rgba(160, 134, 214, 0.32);

  --glass: rgba(250, 244, 233, 0.76);
  --glass-edge: rgba(255, 252, 244, 0.7);
  --bezel: rgba(60, 40, 15, 0.045);
  --scrim: rgba(50, 34, 12, 0.32);
  --shadow-sm: 0 1px 2px rgba(80, 52, 14, 0.08), 0 1px 1px rgba(80, 52, 14, 0.04);
  --shadow-md: 0 12px 32px -12px rgba(80, 52, 14, 0.24), 0 3px 8px -3px rgba(80, 52, 14, 0.08);
  --shadow-lg: 0 32px 72px -20px rgba(80, 52, 14, 0.32), 0 8px 20px -8px rgba(80, 52, 14, 0.12);
  --inner-light: inset 0 1px 0 rgba(255, 252, 244, 0.8);
  --grain: var(--grain-dark);
  --grain-opacity: 0.07;
  --art-filter: sepia(0.12);
}

/* =====================================================================
   NIGHT — deep indigo with lamplight gold (default dark)
   ===================================================================== */
.theme-cathedral {
  color-scheme: dark;
  --canvas: #0C1020;
  --surface: #141A30;
  --raised: #1B2240;
  --ink: #EDEFF7;
  --ink-2: #B8BDD4;
  --ink-3: #8C92AF;
  --ink-4: #4E5573;
  --line: rgba(237, 239, 247, 0.08);
  --line-strong: rgba(237, 239, 247, 0.15);
  --accent: #E9C46F;
  --accent-ink: #1A1405;
  --accent-soft: rgba(233, 196, 111, 0.12);
  --accent-line: rgba(233, 196, 111, 0.36);
  --gilt: #E9C46F;
  --gilt-soft: rgba(233, 196, 111, 0.14);
  --toast-accent: #3343B0;
  --rubric: #FF8E84;

  --hl-gold: rgba(233, 196, 111, 0.28);
  --hl-rose: rgba(255, 142, 160, 0.26);
  --hl-emerald: rgba(102, 210, 150, 0.24);
  --hl-sky: rgba(120, 170, 255, 0.28);
  --hl-amethyst: rgba(176, 150, 255, 0.28);

  --glass: rgba(24, 30, 54, 0.72);
  --glass-edge: rgba(255, 255, 255, 0.08);
  --bezel: rgba(255, 255, 255, 0.04);
  --scrim: rgba(3, 5, 14, 0.6);
  --shadow-sm: 0 1px 2px rgba(2, 4, 12, 0.5);
  --shadow-md: 0 14px 34px -12px rgba(2, 4, 12, 0.8), 0 3px 8px rgba(2, 4, 12, 0.4);
  --shadow-lg: 0 32px 72px -18px rgba(2, 4, 12, 0.85), 0 0 0 1px rgba(255, 255, 255, 0.05);
  --inner-light: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  --grain: var(--grain-light);
  --grain-opacity: 0.03;
  --art-filter: brightness(0.84) saturate(0.88);
}

/* =====================================================================
   READING TYPEFACES — scale evens out each face's x-height
   ===================================================================== */
.font-serif { --reader-font: var(--font-text); --reader-scale: 0.96; }