/* Landing and login pages. Same palette as the course player (assets/style.css). */
:root {
  --bg: #f7f7fb; --surface: #ffffff; --surface-2: #f0f1f8; --text: #1d2033; --muted: #636b86;
  --border: #dfe2ee; --accent: #3b5bdb; --accent-ink: #ffffff; --accent-soft: #e4e9ff; --ok: #1f9d55; --bad: #d64545;
  --shadow: 0 1px 2px rgba(20,24,60,.06), 0 6px 20px rgba(20,24,60,.06);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1120; --surface: #181b30; --surface-2: #20243d; --text: #e8eaf8; --muted: #9aa2c4;
    --border: #2b3052; --accent: #7c93ff; --accent-ink: #0f1120; --accent-soft: #232a55; --ok: #4cd08a; --bad: #ff7a7a;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.3);
  }
}
:root[data-theme="dark"] {
  --bg: #0f1120; --surface: #181b30; --surface-2: #20243d; --text: #e8eaf8; --muted: #9aa2c4;
  --border: #2b3052; --accent: #7c93ff; --accent-ink: #0f1120; --accent-soft: #232a55; --ok: #4cd08a; --bad: #ff7a7a;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.3);
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.55 var(--font); -webkit-font-smoothing: antialiased; }
a { color: var(--accent); }
.muted { color: var(--muted); }
.btn { display: inline-flex; align-items: center; gap: 6px; border: 0; border-radius: 10px; padding: 10px 16px; background: var(--accent); color: var(--accent-ink); font: inherit; font-weight: 600; cursor: pointer; text-decoration: none; }
.btn:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--muted); border: 1px solid var(--border); padding: 6px 12px; font-weight: 500; }

/* Landing */
.top { max-width: 1040px; margin: 0 auto; padding: 40px 16px 8px; display: flex; align-items: flex-end; gap: 16px; flex-wrap: wrap; }
.top h1 { margin: 0; font-size: clamp(1.8rem, 4vw, 2.4rem); letter-spacing: -.02em; }
.top .lead { margin: 4px 0 0; color: var(--muted); }
.top .who { margin-left: auto; display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: .9rem; }
.top .who form { margin: 0; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 16px 16px 64px; }
.summary { display: flex; gap: 24px; flex-wrap: wrap; margin: 8px 0 28px; color: var(--muted); font-size: .92rem; }
.summary b { color: var(--text); font-size: 1.15rem; margin-right: 4px; }
.section-title { font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 28px 0 12px; font-weight: 600; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.card { position: relative; display: flex; flex-direction: column; gap: 10px; padding: 20px; border: 1px solid var(--border); border-radius: 14px; background: var(--surface); box-shadow: var(--shadow); color: inherit; text-decoration: none; transition: border-color .15s, transform .15s; }
.card:hover { border-color: var(--accent); transform: translateY(-1px); }
.card h2 { margin: 0; font-size: 1.12rem; line-height: 1.3; }
.card .sub { margin: 0; color: var(--muted); font-size: .92rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card .src { margin: 0; color: var(--muted); font-size: .82rem; }
.card .meter { margin-top: auto; display: flex; align-items: center; gap: 10px; font-size: .85rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.bar { flex: 1; height: 8px; background: var(--surface-2); border-radius: 99px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), #8a6bff); border-radius: 99px; }
.card.done .bar > i { background: var(--ok); }
.card .next { font-size: .88rem; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.card .next span { color: var(--muted); }
.badge { position: absolute; top: 16px; right: 16px; font-size: .75rem; font-weight: 600; padding: 2px 8px; border-radius: 99px; background: var(--accent-soft); color: var(--accent); }
.card.done .badge { background: color-mix(in srgb, var(--ok) 15%, transparent); color: var(--ok); }
.card h2 { padding-right: 76px; }
.note { margin-top: 40px; color: var(--muted); font-size: .85rem; }

/* Login */
body.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-box { width: 100%; max-width: 360px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; box-shadow: var(--shadow); padding: 28px; }
.login-box h1 { margin: 0 0 4px; font-size: 1.5rem; }
.login-box p { margin: 0 0 20px; }
.login-box form { display: grid; gap: 14px; }
.login-box label { display: grid; gap: 6px; font-size: .9rem; color: var(--muted); }
.login-box input { font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; }
.login-box input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.login-box .btn { justify-content: center; margin-top: 4px; }
.error { margin: 0; color: var(--bad); font-size: .9rem; }