:root {
  --bg: #f7f8fb;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --brand: #2563eb;
  --brand-soft: #eff6ff;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; color: var(--text); background: var(--bg); }
.topbar { padding: 1.2rem 1.25rem; background: linear-gradient(120deg, #0f172a, #1d4ed8); color: #fff; }
.topbar h1 { margin: 0; font-size: 1.4rem; }
.topbar p { margin: 0.25rem 0 0; opacity: 0.9; }
.layout { display: grid; grid-template-columns: 290px 1fr; gap: 1rem; padding: 1rem; }
.sidebar { position: sticky; top: 0.8rem; align-self: start; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 1rem; max-height: calc(100vh - 1.6rem); overflow: auto; }
.sidebar h2 { margin: 0 0 0.75rem; font-size: 1rem; }
#menu { display: flex; flex-direction: column; gap: 0.35rem; }
.menu-link { display: block; text-decoration: none; color: var(--text); padding: 0.5rem 0.65rem; border-radius: 10px; border: 1px solid transparent; font-size: 0.92rem; line-height: 1.25; }
.menu-link:hover { background: #f3f4f6; }
.menu-link.active { background: var(--brand-soft); border-color: #bfdbfe; color: #1d4ed8; font-weight: 600; }
.content { display: grid; gap: 0.9rem; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 1rem; scroll-margin-top: 1rem; }
.card h2 { margin: 0 0 0.75rem; font-size: 1.15rem; }
.media { display: block; margin-bottom: 0.85rem; }
.cover-link { position: relative; display: block; width: min(100%, 420px); border-radius: 12px; overflow: hidden; border: 1px solid var(--line); background: #f3f4f6; }
.cover { display: block; width: 100%; height: auto; object-fit: cover; background: #f3f4f6; }
.section-title { margin: 0.95rem 0 0.45rem; font-size: 0.95rem; color: #0f172a; }
.summary { margin: 0; color: #111827; }
.points { margin: 0.3rem 0 0; padding-left: 1.15rem; }
.points li { margin: 0.28rem 0; }
.pdf-list { margin: 0.85rem 0 0; padding: 0; list-style: none; display: grid; gap: 0.75rem; }
.pdf-item { border: 1px solid var(--line); border-radius: 12px; padding: 0.75rem; background: #fafafa; }
.pdf-title { margin: 0 0 0.55rem; font-weight: 600; }
.pdf-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.pdf-link { text-decoration: none; background: var(--brand); color: #fff; padding: 0.45rem 0.72rem; border-radius: 8px; font-size: 0.88rem; font-weight: 600; }
.pdf-link.secondary { background: #374151; }
details { margin-top: 0.9rem; border-top: 1px dashed var(--line); padding-top: 0.75rem; }
summary { cursor: pointer; font-weight: 600; color: var(--brand); }
.transcript { margin-top: 0.65rem; white-space: pre-wrap; line-height: 1.45; color: #111827; }
.loading, .error { margin: 0; padding: 1rem; background: var(--panel); border-radius: 10px; border: 1px solid var(--line); }
@media (max-width: 980px) { .layout { grid-template-columns: 1fr; } .sidebar { position: static; max-height: unset; } #menu { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); } }