/* Recursion Education: site styles.
   Tokens come from design/tokens.json (light theme). Do not add colours. */
:root {
  --brand-navy: #0B1F3A;
  --brand-teal: #12B5A0;
  --brand-teal-bright: #12D4BC;
  --brand-coral: #FF6B57;
  --surface: #FFFFFF;
  --surface-raised: #F3F6F9;
  --surface-brand: #0B1F3A;
  --surface-brand-raised: #12294A;
  --on-brand: #FFFFFF;
  --on-brand-muted: #B6C2D2;
  --ink: #0B1F3A;
  --ink-muted: #4A5B73;
  --link: #076B5D;
  --border: #D3DAE4;
  --border-strong: #6B7C94;
  --border-dark: #2B4467;
  --focus: #0B1F3A;
  --accent: #12B5A0;
  --on-accent: #0B1F3A;
  --highlight: #FF6B57;
  --on-highlight: #0B1F3A;
  --tint-teal: #D6F4EF;
  --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px; --space-5: 24px;
  --space-6: 32px; --space-7: 48px; --space-8: 64px; --space-9: 96px;
  --radius-sm: 6px; --radius-md: 10px; --radius-lg: 16px; --radius-xl: 24px; --radius-pill: 999px;
  --shadow-sm: 0 1px 2px rgba(11, 31, 58, 0.08);
  --shadow-md: 0 6px 16px rgba(11, 31, 58, 0.12);
  --font-display: "Lexend", "Segoe UI", Calibri, system-ui, sans-serif;
  --font-sans: "Inter", "Segoe UI", Calibri, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; background: var(--surface); color: var(--ink); font: 400 16px/26px var(--font-sans); }
img { max-width: 100%; height: auto; }
a:focus-visible, .btn:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding-left: var(--space-5); padding-right: var(--space-5); }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: var(--space-4); top: var(--space-4); background: var(--surface); padding: var(--space-2) var(--space-4); z-index: 10; }

.pill { display: inline-flex; align-items: center; font: 600 12px/16px var(--font-display); padding: 4px 10px; border-radius: var(--radius-pill); white-space: nowrap; }
.pill-teal { background: var(--tint-teal); color: var(--ink); }
.pill-coral { background: var(--highlight); color: var(--on-highlight); }
.pill-outline-dark { border: 1px solid #7F93AE; color: var(--surface-raised); }

/* Header */
.site-header { border-bottom: 1px solid var(--border); background: var(--surface); }
.site-header .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-4); padding-top: var(--space-4); padding-bottom: var(--space-4); }
.site-header .logo { display: block; line-height: 0; }
.site-header .logo img { width: 168px; display: block; }

/* Hero */
.hero { background: var(--surface-brand); color: var(--on-brand); }
.hero .wrap { padding-top: clamp(48px, 8vw, 96px); padding-bottom: clamp(48px, 8vw, 96px); display: flex; flex-direction: column; gap: var(--space-5); }
.eyebrow { margin: 0; font: 600 12px/16px var(--font-display); letter-spacing: 0.12em; text-transform: uppercase; }
.hero .eyebrow { color: var(--brand-teal-bright); }
.hero h1 { margin: 0; max-width: 780px; font: 700 clamp(36px, 5vw, 56px)/1.07 var(--font-display); letter-spacing: -0.02em; }
.hero .lead { margin: 0; max-width: 680px; font-size: 18px; line-height: 28px; color: var(--on-brand-muted); }
.tags { display: flex; flex-wrap: wrap; gap: var(--space-3); }

/* Systems */
.systems .wrap { padding-top: clamp(48px, 6vw, 64px); padding-bottom: clamp(48px, 6vw, 64px); display: flex; flex-direction: column; gap: var(--space-6); }
.systems h2 { margin: 0 0 var(--space-2); font: 600 24px/30px var(--font-display); }
.systems .intro { margin: 0; max-width: 680px; color: var(--ink-muted); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: var(--space-5); }
.card { display: flex; flex-direction: column; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); overflow: hidden; transition: box-shadow 150ms ease-out; }
.card:hover { box-shadow: var(--shadow-md); }
.card .media { height: 128px; background: var(--surface-brand); display: flex; align-items: center; justify-content: center; }
.card .body { padding: var(--space-5); display: flex; flex-direction: column; gap: var(--space-3); flex: 1; }
.card h3 { margin: 0; font: 600 20px/26px var(--font-display); }
.card p { margin: 0; font-size: 14px; line-height: 22px; color: var(--ink-muted); }
.card .foot { margin-top: auto; padding-top: var(--space-3); }

/* Layout sketches on each card */
.wire { position: relative; width: 200px; height: 92px; background: var(--surface-brand-raised); border-radius: var(--radius-md); overflow: hidden; }
.wire i { position: absolute; display: block; border-radius: 4px; }
.wire .t { background: var(--brand-teal-bright); }
.wire .g { background: var(--border-dark); }
.wire .sq { border-radius: 0; }
.wire .pillshape { border-radius: var(--radius-pill); }

.btn { display: inline-flex; align-items: center; gap: var(--space-2); padding: 12px 20px; border-radius: var(--radius-md); border: 2px solid var(--border-strong); background: transparent; color: var(--ink); font: 600 14px/20px var(--font-sans); text-decoration: none; transition: background 150ms ease-out; }
.btn:hover { background: var(--surface-raised); }
.btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.note { background: var(--tint-teal); border-radius: var(--radius-md); padding: var(--space-5); display: flex; flex-direction: column; gap: var(--space-2); align-self: stretch; }
.note h4 { margin: 0; font: 600 16px/22px var(--font-display); color: var(--link); }
.note p { margin: 0; font-size: 14px; line-height: 22px; color: var(--ink); }

/* Footer */
.site-footer { background: var(--surface-brand); color: var(--on-brand-muted); }
.site-footer .wrap { padding-top: var(--space-7); padding-bottom: var(--space-7); display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: var(--space-5); }
.site-footer img { width: 168px; display: block; }
.site-footer .tagline { margin: var(--space-3) 0 0; font: 600 16px/22px var(--font-display); }
.site-footer .legal { margin: 0; font-size: 12px; line-height: 18px; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }