/* ==========================================================================
   Horizon - Grades & Deadlines
   ========================================================================== */

:root {
  color-scheme: dark;
  /* Dark grey, never pure black: page, alt bands, cards, sunken wells */
  --bg-primary: #131316;
  --bg-secondary: #17171c;
  --bg-surface: #1e1e24;
  --bg-surface-subtle: #26262d;
  --bg-translucent: rgba(19, 19, 22, 0.82);

  /* Typography */
  --text-primary: #f5f5f7;
  --text-secondary: #86868b;
  --text-tertiary: #7f7f86;

  /* Single Accent Color: chic carbon blue */
  --accent-blue: #0f62fe;
  --accent-blue-hover: #0353e9;
  --accent-blue-subtle: rgba(15, 98, 254, 0.12);

  /* System Hairlines - Zero Drop Shadows */
  --hairline-border: 1px solid rgba(255, 255, 255, 0.11);
  --hairline-border-hover: 1px solid rgba(255, 255, 255, 0.2);
  --hairline-divider: 1px solid rgba(255, 255, 255, 0.08);

  /* Typography Stack */
  --font-system: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-display: "Space Grotesk", "Inter", -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", Menlo, Monaco, "JetBrains Mono", monospace;

  /* Fixed type steps */
  --fs-xs: 12px;
  --fs-sm: 14px;
  --fs-md: 16px;
  --fs-lg: 20px;
  --fs-xl: 28px;

  /* Fixed spacing steps */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 16px;
  --sp-4: 24px;
  --sp-5: 32px;

  /* Restrained Geometry (final radii live in the v44 squircle system;
     keep this token equal to the card radius there: 24px) */
  --radius-card: 24px;
  --radius-pill: 980px;

  /* Uniform geometry scale: controls → sm, small surfaces → md,
     cards + modals → card. Pills keep their 14px compact radius. */
  --radius-sm: 10px;
  --radius-md: 16px;

  /* Depth: soft elevation for cards, deeper for popups */
  --shadow-card: 0 8px 28px rgba(0, 0, 0, 0.14);
  --shadow-pop: 0 24px 70px rgba(0, 0, 0, 0.4);

  /* Restrained Apple Motion: everything resolves in ~150ms */
  --ease-apple: cubic-bezier(0.25, 1, 0.5, 1);
  --transition-fast: 0.15s var(--ease-apple);
  --transition-normal: 0.15s var(--ease-apple);
}

/* Screen-reader-only content (live announcements) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-system);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Theme-aware scrollbar */
:root {
  --sb-track: #1e1e24;
  --sb-thumb: #3a3a3c;
  --sb-thumb-hover: #555558;
}
[data-theme="light"], [data-theme="colorblind-light"] {
  --sb-track: #e4e4e8;
  --sb-thumb: #b9b9c0;
  --sb-thumb-hover: #9a9aa2;
}
[data-theme="ghost"] {
  --sb-track: #0a0a0c;
  --sb-thumb: #2b2b30;
  --sb-thumb-hover: #3d3d44;
}
[data-theme="indie"] {
  --sb-track: #e8e1d1;
  --sb-thumb: #c2b797;
  --sb-thumb-hover: #a89e83;
}
[data-theme="moss"] {
  --sb-track: #e3ddc9;
  --sb-thumb: #a9b08d;
  --sb-thumb-hover: #8b9570;
}
[data-theme="tangerine"] {
  --sb-track: #e9e3d3;
  --sb-thumb: #cfc3a8;
  --sb-thumb-hover: #b3a586;
}
[data-theme="marigold"], [data-theme="marigold-blind"] {
  --sb-track: #f0e4c8;
  --sb-thumb: #c8ab6d;
  --sb-thumb-hover: #ab8f55;
}
[data-theme="colorblind"] {
  --sb-track: #0a0c10;
  --sb-thumb: #3d5a80;
  --sb-thumb-hover: #50709a;
}
[data-theme="tritan"] {
  --sb-track: #101014;
  --sb-thumb: #4a4a55;
  --sb-thumb-hover: #5e5e6a;
}
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--sb-track);
}
::-webkit-scrollbar-thumb {
  background: var(--sb-thumb);
  border-radius: 6px;
  border: 2px solid var(--sb-track);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--sb-thumb-hover);
}
* {
  scrollbar-width: thin;
  scrollbar-color: var(--sb-thumb) var(--sb-track);
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.55;
  font-size: var(--fs-md);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* Noise texture removed for a flat, calm finish - restore from git if missed */

body > * {
  position: relative;
  z-index: 1;
}

/* Ambient top glow: theme-aware color wash behind everything.
   Off on paper themes, where it reads as a bulge. */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(700px 320px at 50% -100px, var(--accent-blue-subtle), transparent 70%),
    radial-gradient(500px 260px at 90% 10%, var(--accent-blue-subtle), transparent 70%);
}

html:is([data-theme="light"], [data-theme="colorblind-light"], [data-theme="indie"], [data-theme="moss"], [data-theme="marigold"], [data-theme="marigold-blind"], [data-theme="tangerine"]) body::before {
  display: none;
}

/* Fullscreen Confetti Canvas */
.confetti-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
}

/* Layout Containers */
.site-container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}