/* Same palette as authPalettes in src/components/authUi.tsx: logo green, cream paper, brown-black ink. */
:root {
  --accent: #1F7535;
  --bg: #FBFAF7;
  --surface: #F2EEE6;
  --text: #1C1712;
  --muted: #6B6358;
  --border: #E4DED2;
  --on-accent: #FFFFFF;
}
@media (prefers-color-scheme: dark) {
  :root {
    --accent: #5DBB7B;
    --bg: #12100E;
    --surface: #1D1A17;
    --text: #F2EEE6;
    --muted: #A69E92;
    --border: #2E2A25;
    --on-accent: #0F1F14;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
a { color: var(--accent); }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

header .wrap { display: flex; align-items: center; justify-content: space-between; padding-top: 18px; padding-bottom: 18px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; color: var(--text); text-decoration: none; }
.brand img { width: 36px; height: 36px; border-radius: 9px; }
nav a { color: var(--muted); text-decoration: none; margin-left: 20px; font-size: 15px; }
nav a:hover { color: var(--text); }

.hero { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: center; padding: 56px 0 72px; }
.hero h1 { font-size: clamp(36px, 6vw, 56px); line-height: 1.08; margin: 0 0 18px; letter-spacing: -0.02em; }
.hero p { color: var(--muted); font-size: 19px; margin: 0 0 28px; max-width: 34em; }
.hero-art img { width: 100%; max-width: 380px; display: block; margin: 0 auto; border-radius: 28px; box-shadow: 0 1px 0 var(--border), 0 12px 40px rgb(0 0 0 / 0.08); }

.btn {
  display: inline-block; padding: 14px 22px; border-radius: 12px;
  background: var(--accent); color: var(--on-accent); text-decoration: none; font-weight: 600;
  margin: 0 10px 10px 0;
}
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn:focus-visible { outline: 3px solid var(--text); outline-offset: 2px; }

section { padding: 64px 0; border-top: 1px solid var(--border); }
section h2 { font-size: 30px; margin: 0 0 8px; letter-spacing: -0.01em; }
.lead { color: var(--muted); margin: 0 0 32px; }

.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature { background: var(--surface); border-radius: 16px; padding: 22px; }
.feature h3 { margin: 0 0 6px; font-size: 18px; }
.feature p { margin: 0; color: var(--muted); font-size: 15px; }

.courses { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px; }
.course { border-radius: 16px; overflow: hidden; background: var(--surface); }
.course img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; display: block; }
.course span { display: block; padding: 12px 14px; font-weight: 600; }
.more { color: var(--muted); margin-top: 18px; font-size: 15px; }

.doc { max-width: 720px; padding: 32px 20px 72px; }
.doc h1 { font-size: 36px; margin-bottom: 4px; }
.doc .date { color: var(--muted); margin-top: 0; }
.doc h2 { font-size: 22px; margin-top: 36px; }

footer { border-top: 1px solid var(--border); color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; padding-top: 24px; padding-bottom: 32px; }
footer a { color: var(--muted); margin-left: 16px; }

@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; padding-top: 24px; gap: 32px; }
  .hero-art { order: -1; }
  .hero-art img { max-width: 220px; }
  .features { grid-template-columns: 1fr; }
  .courses { grid-template-columns: 1fr 1fr; gap: 12px; }
  .course span { font-size: 15px; padding: 10px 12px; }
  nav a:not(:last-child) { display: none; }
}