/* Shared "Bloort" dark style for the algorithms course: dots and blocks,
   dark sandbox, amber for the active element, cyan for comparisons. */
:root {
  color-scheme: dark;
  --bg: #0b0b0c;
  --ink: rgba(237, 237, 230, 1);
  --ink-dim: rgba(237, 237, 230, 0.6);
  --ink-faint: rgba(237, 237, 230, 0.35);
  --panel: rgba(255, 255, 255, 0.04);
  --line: rgba(237, 237, 230, 0.12);
  --amber: #E8B84B;
  --cyan: #7CD5E8;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.55 ui-sans-serif, -apple-system, "Segoe UI", sans-serif;
}
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 980px; margin: 0 auto; padding: 28px 20px 80px; }
header.page-head { margin-bottom: 20px; }
header.page-head h1 { font-size: 22px; margin: 0 0 4px; }
header.page-head p { color: var(--ink-dim); margin: 0; }
.back-link { display: inline-block; margin-bottom: 14px; color: var(--ink-dim); font-size: 13px; }
.btn {
  background: var(--panel);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 12px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}
.btn:hover { background: rgba(255,255,255,.09); }
.btn.on { background: var(--amber); border-color: var(--amber); color: #1a1406; font-weight: 600; }
.toggle-row { display: flex; gap: 8px; margin-bottom: 18px; }
.prev-next { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 20px; }
.prev-next .btn { max-width: 42%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.prev-next-pos { color: var(--ink-faint); font-size: 12px; flex: none; }
.year-group { margin-bottom: 34px; }
.year-title { font-size: 18px; margin: 0 0 14px; padding-bottom: 6px; border-bottom: 1px solid var(--line); color: var(--amber); }
.module-group { margin-bottom: 26px; }
.module-group h2 { font-size: 15px; margin: 0 0 2px; }
.module-group .module-meta { color: var(--ink-dim); font-size: 12.5px; margin: 0 0 10px; }
.topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px; }
.topic-card {
  display: block;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  background: var(--panel);
}
.topic-card.built {
  cursor: pointer;
  border-color: rgba(232, 184, 75, 0.35);
}
.topic-card.built:hover { background: rgba(232, 184, 75, 0.08); }
.topic-card.todo {
  opacity: 0.55;
}
.topic-card .t-title { font-size: 13.5px; font-weight: 600; margin: 0 0 4px; }
.topic-card .t-tag {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--ink-faint);
}
.topic-card.built .t-tag { color: var(--amber); }

/* Topic page */
.topic-layout { display: grid; grid-template-columns: 1fr; gap: 20px; }
@media (min-width: 860px) {
  .topic-layout { grid-template-columns: 1.3fr 1fr; }
}
.panel-box {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  padding: 14px 16px;
}
.canvas-wrap { position: relative; width: 100%; height: 280px; border-radius: 8px; overflow: hidden; border: 1px solid var(--line); }
canvas.algo-canvas { display: block; width: 100%; height: 100%; }
.player-controls { display: flex; align-items: center; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.player-controls input[type="range"].scrub { flex: 1; min-width: 120px; }
.counters { font-size: 12px; color: var(--ink-dim); margin-top: 6px; font-variant-numeric: tabular-nums; }
.caption { min-height: 2.6em; font-size: 13.5px; color: var(--ink); margin-top: 10px; }
.sandbox-controls { display: flex; flex-direction: column; gap: 10px; margin-top: 12px; }
.sandbox-row { display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--ink-dim); }
.sandbox-row label { min-width: 110px; }
.sandbox-array-input, .sandbox-target-input {
  flex: 1;
  background: rgba(255,255,255,.04);
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  padding: 5px 8px;
  font: 12.5px ui-monospace, Menlo, monospace;
}
pre.code-block {
  background: rgba(0,0,0,.35);
  border-radius: 8px;
  padding: 12px 14px;
  font: 12.5px/1.6 ui-monospace, Menlo, monospace;
  overflow-x: auto;
  margin: 0;
}
pre.code-block .line { display: block; padding: 1px 6px; border-radius: 4px; white-space: pre; }
pre.code-block .line.active { background: rgba(232, 184, 75, 0.18); color: var(--amber); }
.explain p { font-size: 13.5px; color: var(--ink); }
.meta-table { font-size: 13px; }
.meta-table dt { color: var(--ink-dim); font-size: 11.5px; text-transform: uppercase; letter-spacing: .04em; margin-top: 10px; }
.meta-table dd { margin: 2px 0 0; }