/* Nerdy website: homepage and privacy policy. Colours follow the app's theme (src/Nerdy.App/Themes). */

:root {
  --bg: #f7f7fa;
  --surface: #ffffff;
  --border: #e4e4ec;
  --text: #1b1b1f;
  --text-muted: #5d5d6b;
  --accent: #5b5bd6;
  --accent-text: #4949ab;
  --accent-soft: #efeffb;
  --on-accent: #ffffff;
  --radius: 14px;
  --font: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1c21;
    --surface: #26262d;
    --border: #36363f;
    --text: #f2f2f5;
    --text-muted: #a9a9b6;
    --accent-text: #a7a7f0;
    --accent-soft: #2c2c47;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--font);
}

a { color: var(--accent-text); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.wrap { max-width: 960px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 760px; }

/* Header and footer */
.site-header { border-bottom: 1px solid var(--border); background: var(--surface); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font: 600 20px/1 var(--font-display); }
.brand img { width: 32px; height: 32px; }
.site-nav { display: flex; gap: 20px; font-size: 15px; }
.site-nav a { color: var(--text-muted); text-decoration: none; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--text); }

.site-footer { border-top: 1px solid var(--border); margin-top: 72px; padding: 28px 0 40px; color: var(--text-muted); font-size: 14px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.site-footer a { color: var(--text-muted); }

/* Homepage */
.hero { padding: 72px 0 56px; text-align: center; }
.hero img { width: 96px; height: 96px; }
.hero h1 { margin: 20px auto 12px; max-width: 720px; font: 700 clamp(30px, 5vw, 44px)/1.15 var(--font-display); letter-spacing: -0.01em; }
.hero p { margin: 0 auto; max-width: 600px; color: var(--text-muted); font-size: 18px; }
.actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 28px; }
.button { display: inline-flex; align-items: center; min-height: 44px; padding: 0 20px; border-radius: 10px; font-weight: 600; text-decoration: none; }
.button.primary { background: var(--accent); color: var(--on-accent); }
.button.primary:hover { filter: brightness(1.08); }
.button.secondary { border: 1px solid var(--border); background: var(--surface); color: var(--text); }
.hero .note { margin-top: 20px; font-size: 14px; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.card { padding: 22px 22px 20px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.card h2 { margin: 0 0 6px; font: 600 18px/1.3 var(--font-display); }
.card p { margin: 0; color: var(--text-muted); }

.section-title { margin: 64px 0 16px; font: 600 24px/1.3 var(--font-display); }
.prose-muted { color: var(--text-muted); }

/* Privacy policy */
.doc { padding: 48px 0 0; }
.doc h1 { margin: 0 0 6px; font: 700 clamp(28px, 4.5vw, 38px)/1.2 var(--font-display); }
.doc .meta { margin: 0 0 28px; color: var(--text-muted); font-size: 15px; }
.doc h2 { margin: 44px 0 10px; font: 600 22px/1.3 var(--font-display); scroll-margin-top: 16px; }
.doc h3 { margin: 26px 0 6px; font: 600 17px/1.35 var(--font-display); }
.doc p, .doc li { max-width: 72ch; }
.doc ul { padding-left: 22px; }
.doc li + li { margin-top: 6px; }
.summary { margin: 0 0 8px; padding: 18px 22px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--accent-soft); }
.summary h2 { margin-top: 0; font-size: 18px; }
.summary ul { margin: 0; }
.toc { margin: 28px 0 0; padding: 18px 22px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.toc h2 { margin: 0 0 8px; font-size: 16px; }
.toc ol { margin: 0; padding-left: 22px; columns: 2 240px; column-gap: 32px; }
.toc li { break-inside: avoid; }

.table-scroll { overflow-x: auto; margin: 12px 0; border: 1px solid var(--border); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { padding: 10px 14px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
th { background: var(--surface); font-weight: 600; }
tr:last-child td { border-bottom: 0; }
td:first-child { min-width: 150px; }

@media (max-width: 560px) {
  .site-nav { gap: 14px; }
  .hero { padding: 48px 0 40px; }
}