:root {
  color-scheme: light dark;
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-2: #172033;
  --border: #334155;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --muted-2: #cbd5e1;
  --accent: #38bdf8;
  --accent-strong: #0ea5e9;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

/* Breadcrumb / top nav */
.crumbs {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}
.crumbs a { color: var(--muted-2); }
.crumbs span { color: var(--muted); }

/* Headings */
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  color: var(--accent);
  margin: 0 0 0.5rem;
  font-weight: 600;
}
h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); margin: 0 0 0.35rem; line-height: 1.15; }
h2 { font-size: 1.25rem; margin: 2.5rem 0 0.75rem; }
.lede { color: var(--muted); margin: 0.25rem 0 0; }

/* Landing hero */
.hero { text-align: center; padding: 3rem 0 2rem; }
.hero p { color: var(--muted); }

/* Card grid (classes / sessions) */
.list { list-style: none; padding: 0; margin: 1.5rem 0 0; display: grid; gap: 0.75rem; }
.card {
  display: block;
  padding: 1rem 1.15rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover { border-color: var(--accent-strong); text-decoration: none; transform: translateY(-1px); }
.card .num { color: var(--muted); font-variant-numeric: tabular-nums; margin-right: 0.6rem; }
.card .title { color: var(--text); font-weight: 500; }
.card .meta { display: block; color: var(--muted); font-size: 0.85rem; margin-top: 0.2rem; }

/* Session sections */
.section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.4rem;
  margin-top: 1rem;
}
.section h2 { margin-top: 0; display: flex; align-items: center; gap: 0.5rem; }
.section .placeholder { color: var(--muted); font-style: italic; }

/* Video block */
.video-link {
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.7rem 1.1rem;
  background: var(--accent-strong); color: #06283d;
  border-radius: 10px; font-weight: 600;
}
.video-link:hover { text-decoration: none; filter: brightness(1.08); }
.video-note { color: var(--muted); font-size: 0.85rem; margin: 0.75rem 0 0; }

/* Prose (AI summary / notes) */
.section h3 { font-size: 1.02rem; margin: 1.5rem 0 0.5rem; color: var(--text); }
.section p { margin: 0.75rem 0; color: var(--muted-2); }
.section p:first-of-type { margin-top: 0; }
.section ol.steps, .section ul.bullets { margin: 0.75rem 0; padding-left: 1.4rem; color: var(--muted-2); }
.section ol.steps li, .section ul.bullets li { margin: 0.4rem 0; }
.section .prose strong { color: var(--text); }

/* AI questions */
ol.questions { margin: 0; padding-left: 1.4rem; }
ol.questions li { margin: 0.5rem 0; color: var(--muted-2); }

/* Prev / next pager */
.pager { display: flex; justify-content: space-between; gap: 1rem; margin-top: 2.5rem; }
.pager a {
  flex: 1; padding: 0.85rem 1rem; background: var(--surface-2);
  border: 1px solid var(--border); border-radius: 10px; color: var(--muted-2);
}
.pager a:hover { border-color: var(--accent-strong); text-decoration: none; }
.pager a.next { text-align: right; }
.pager a .dir { display: block; font-size: 0.75rem; color: var(--muted); }
.pager .spacer { flex: 1; }

footer { margin-top: 3rem; color: var(--muted); font-size: 0.8rem; text-align: center; }