@import url("../../reinforcement_learning/lessons/style.css");

/* ───────────────────────────────────────────────────────────────
   人类与文明简史 / history track extras（sapiens ⊕ world_history 合并）
   Gold-standard components (kicker, source-note, trade-table,
   lesson-grid, mini-flow, position-grid) — same look as the ray track,
   plus a few cosmos-only touches. Builds on the shared RL base sheet.
   ─────────────────────────────────────────────────────────────── */

.kicker,
.part-label {
  display: block;
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-mute);
}

/* 《时间简史》/ book-source callouts get the amber accent */
.source-note { border-left-color: var(--accent-2); }

/* the punch line that closes each lesson */
.callout.takeaway {
  border-left-color: var(--ok);
  background: #f0fdf4;
}

/* three-up info cards: "linear position" / coverage */
.position-grid,
.coverage-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 18px 0;
}
.position-grid div,
.coverage-grid div {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elev);
  padding: 12px 14px;
}
.position-grid strong,
.coverage-grid strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
}
.position-grid span,
.coverage-grid span {
  display: block;
  color: var(--text-mute);
  font-size: 13px;
  line-height: 1.5;
}

/* labelled flow rows (label | description) */
.lesson-flow { display: grid; gap: 10px; margin: 18px 0; }
.lesson-flow div {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elev);
  padding: 12px 14px;
}
.lesson-flow strong { font-family: var(--mono); font-size: 12px; color: var(--accent); }
.lesson-flow span { color: var(--text-mute); font-size: 14px; }

/* trade-off / comparison tables */
.trade-table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 14px;
  table-layout: auto;
}
.trade-table th,
.trade-table td {
  border: 1px solid var(--border);
  padding: 9px 11px;
  text-align: left;
  vertical-align: top;
}
.trade-table th {
  background: var(--bg-elev);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text);
  text-transform: none;
  letter-spacing: 0;
}

/* two-up cards */
.lesson-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 18px 0;
}
.lesson-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elev);
  padding: 14px;
}
.lesson-card h3 { margin-top: 0; }

/* numbered mini-flow steps */
.mini-flow { display: grid; gap: 8px; margin: 18px 0; }
.mini-flow .step {
  border: 1px solid var(--border);
  background: var(--bg-elev);
  border-radius: 8px;
  padding: 10px 12px;
}
.mini-flow .n { font-family: var(--mono); color: var(--accent); font-size: 12px; margin-right: 6px; }

.toc-card .path {
  margin-top: 6px;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.4;
}

@media (max-width: 820px) {
  .position-grid,
  .coverage-grid { grid-template-columns: 1fr; }
  .lesson-flow div { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .lesson-grid { grid-template-columns: 1fr; }
}