/* OmniTutor · design tokens · v0
 *  Source of truth: omnitutor.ai/_design/design_language.html
 *
 *  Four-blue palette + warm anchors. Used by every page.
 */

:root {
  /* the four blues */
  --sky-100: #b8e0ff;
  --sky-300: #7ec8f0;
  --sky-500: #4ea9e8;
  --sky-700: #1d6fc4;
  --sky-900: #0d3a78;

  --sea-400: #2a96b0;
  --sea-600: #0e6e8e;
  --sea-800: #0a4f68;

  --ink-700: #1a2542;
  --ink-800: #131c33;
  --ink-900: #0a1424;
  --ink-950: #050a16;

  /* warm anchors (use sparingly) */
  --gold:      #f6c453;
  --gold-soft: #ffd97d;
  --coral:     #ff8a65;
  --mint:      #5fc1a8;
  --cream:     #fef3c7;

  /* support */
  --line:        rgba(184,224,255,0.10);
  --line-strong: rgba(126,200,240,0.22);
  --fg:   var(--cream);
  --dim:  #8aa3c0;
  --soft: #5b6e88;

  /* type stack */
  --serif: 'Playfair Display', Georgia, serif;
  --sans:  'Inter', system-ui, -apple-system, sans-serif;
  --mono:  'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;
  --hand:  'Crimson Pro', Georgia, serif;
  --math:  'Crimson Pro', Georgia, serif;
}

/* base */
* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--ink-900);
  color: var(--fg);
  font-family: var(--sans);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
body {
  background:
    radial-gradient(ellipse 1400px 700px at 30% -200px, rgba(126,200,240,0.18) 0%, transparent 70%),
    linear-gradient(180deg, #0d2244 0%, var(--ink-900) 50%, var(--ink-950) 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

a { color: var(--sky-300); text-decoration: none; }
a:hover { color: var(--cream); }

h1, h2, h3 { font-family: var(--serif); font-weight: 500; color: var(--cream); line-height: 1.2; }
h1 em, h2 em, h3 em { color: var(--sky-500); font-style: italic; }

code, pre {
  font-family: var(--mono);
  background: rgba(0,0,0,0.30);
  color: var(--cream);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

/* tokens · component utilities (shared across pages) */
.btn-primary {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 18px; border-radius: 8px; border: none; cursor: pointer;
  background: var(--sky-700); color: #fff;
  font-family: var(--sans); font-size: 13px; font-weight: 700;
  box-shadow: 0 4px 14px rgba(29,111,196,0.35);
}
.btn-primary:hover { background: var(--sky-500); transform: translateY(-1px); }

.pill { padding: 3px 9px; border-radius: 14px; font-family: var(--mono); font-size: 10px; letter-spacing: 0.10em; font-weight: 700; text-transform: uppercase; }
.pill-mint  { background: rgba(95,193,168,0.16); color: var(--mint); }
.pill-gold  { background: rgba(246,196,83,0.16); color: var(--gold); }
.pill-coral { background: rgba(255,138,101,0.16); color: var(--coral); }
.pill-sky   { background: rgba(126,200,240,0.10); color: var(--sky-300); }