/* 面试速记图与冲刺学习组件 */
.visual-card {
  margin: 18px 0 20px; overflow: hidden;
  border: 1px solid var(--line); border-radius: 13px; background: var(--surface); box-shadow: var(--shadow);
}
.visual-card > summary {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 14px 18px; cursor: pointer; list-style: none; background: var(--surface-2);
}
.visual-card > summary::-webkit-details-marker { display: none; }
.visual-card > summary > span:first-child { display: flex; align-items: center; gap: 12px; }
.visual-card > summary strong { font-size: 14px; }
.visual-kicker { color: var(--accent-strong); font: 750 10px var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.visual-toggle { color: var(--muted); font-size: 10.5px; white-space: nowrap; }
.visual-body { padding: 20px; }
.visual-caption { padding: 10px 18px; border-top: 1px solid var(--line); color: var(--muted); background: var(--surface-2); font-size: 11px; line-height: 1.65; }
.visual-formula { margin-top: 15px; padding: 11px 14px; border-left: 3px solid var(--accent); border-radius: 0 8px 8px 0; background: var(--accent-soft); color: var(--ink-2); font-size: 12px; line-height: 1.7; }
.visual-formula strong { color: var(--ink); }

.visual-flow { display: flex; align-items: stretch; gap: 7px; }
.visual-flow > i { align-self: center; color: var(--accent); font-style: normal; font-weight: 800; }
.visual-flow-step { flex: 1; min-width: 0; padding: 12px 9px; border: 1px solid var(--line); border-radius: 9px; background: var(--surface-2); text-align: center; }
.visual-flow-step > span { display: block; color: var(--accent-strong); font: 700 9px var(--mono); }
.visual-flow-step strong { display: block; margin: 3px 0; font-size: 12px; }
.visual-flow-step small { display: block; color: var(--muted); font-size: 9.5px; line-height: 1.5; }

.power-diagram { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 10px; align-items: center; }
.power-node { min-height: 105px; padding: 15px 12px; border: 1px solid var(--line-strong); border-radius: 10px; background: var(--accent-soft); text-align: center; }
.power-node > span { color: var(--accent-strong); font: 700 9px var(--mono); }
.power-node strong { display: block; margin: 7px 0 4px; font-size: 15px; }
.power-node small { color: var(--ink-2); font-size: 10px; }
.power-node.switched { background: var(--warning-soft); }
.power-node.safe { background: var(--good-soft); }
.power-arrow { color: var(--accent); text-align: center; font-size: 20px; font-weight: 750; }
.power-arrow small { display: block; max-width: 105px; color: var(--muted); font-size: 9px; font-weight: 500; line-height: 1.4; }

.congestion-layout { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(210px, .8fr); gap: 22px; align-items: center; }
.bar-chart { padding: 5px 0; }
.bar-row { display: grid; grid-template-columns: 65px minmax(100px, 1fr) 40px; gap: 10px; align-items: center; margin: 12px 0; font-size: 12px; }
.bar-row > span { color: var(--ink-2); }
.bar-row > strong { text-align: right; font-variant-numeric: tabular-nums; }
.bar-track { height: 16px; border-radius: 4px; background: #e5eef8; }
:root[data-theme="dark"] .bar-track { background: #263c50; }
.bar-fill { height: 16px; border-radius: 0 4px 4px 0; background: #2a78d6; }
:root[data-theme="dark"] .bar-fill { background: #3987e5; }
.bar-track:hover .bar-fill, .bar-track:focus .bar-fill { filter: brightness(1.12); }
.bar-formula { margin-top: 14px; color: var(--ink-2); font-size: 12.5px; text-align: center; }
.visual-mini-table { display: grid; grid-template-columns: repeat(3, 1fr); gap: 7px; }
.visual-mini-table > div { padding: 11px 8px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface-2); text-align: center; }
.visual-mini-table span { display: block; color: var(--accent-strong); font: 700 10px var(--mono); }
.visual-mini-table strong { display: block; margin-top: 3px; font-size: 10.5px; }

.timing-path { display: grid; grid-template-columns: auto 1fr auto; gap: 14px; align-items: center; }
.timing-path > span { padding: 10px 14px; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--surface-2); font-size: 12px; font-weight: 700; }
.timing-path > i { position: relative; height: 2px; background: var(--accent); text-align: center; font-style: normal; }
.timing-path > i::after { content: "→"; position: absolute; right: -3px; top: -14px; color: var(--accent); font-size: 18px; }
.timing-path > i { color: var(--muted); font-size: 10px; line-height: 0; }
.timing-adjust { display: flex; justify-content: space-between; gap: 10px; margin: 16px 0 10px; padding: 10px 13px; border-radius: 8px; background: var(--accent-soft); font-size: 12px; }
.timing-adjust > span { color: var(--accent-strong); font-weight: 750; }
.timing-effects { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.timing-effects > div { padding: 12px; border: 1px solid var(--line); border-radius: 9px; background: var(--surface-2); text-align: center; }
.timing-effects small, .timing-effects span { display: block; color: var(--muted); font-size: 10px; }
.timing-effects strong { display: block; margin: 2px 0; font-size: 24px; line-height: 1.3; }

.track-comparison { display: grid; grid-template-columns: 1fr auto 1fr; gap: 22px; align-items: center; }
.track-example { text-align: center; }
.track-example > strong { display: block; margin-top: 10px; font-size: 13px; }
.track-example > span { color: var(--muted); font-size: 10.5px; }
.track-cell { margin: 0 auto; width: 130px; padding: 10px 14px; display: flex; flex-direction: column; justify-content: space-between; border: 2px solid var(--line-strong); border-radius: 5px; background: var(--surface-2); }
.track-cell.tall { height: 160px; }
.track-cell.short { height: 118px; }
.track-cell i { display: block; height: 2px; border-radius: 1px; background: var(--accent); }
.track-tradeoff { color: var(--ink-2); font-size: 13px; font-weight: 750; text-align: center; }
.track-tradeoff span { color: var(--warning); font-size: 10px; font-weight: 650; }

.review-shortcut-hint { margin: 10px 0 0; color: var(--muted); font-size: 10.5px; text-align: center; }
.mastered-toolbar { display: grid; grid-template-columns: minmax(180px, 1fr) minmax(160px, .35fr); gap: 10px; margin: 18px 0; }
.mastered-list-note { margin-bottom: 12px; color: var(--muted); font-size: 12px; }
.sr-only { position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; margin: -1px !important; overflow: hidden !important; clip: rect(0, 0, 0, 0) !important; white-space: nowrap !important; border: 0 !important; }

@media (max-width: 860px) {
  .visual-flow { display: grid; grid-template-columns: repeat(3, 1fr); }
  .visual-flow > i { display: none; }
  .congestion-layout { grid-template-columns: 1fr; }
  .power-diagram { grid-template-columns: 1fr; }
  .power-node { min-height: 80px; }
  .power-arrow { transform: rotate(90deg); }
  .power-arrow small { display: none; }
}

@media (max-width: 600px) {
  .visual-card > summary { align-items: flex-start; padding: 12px 14px; }
  .visual-card > summary > span:first-child { display: grid; gap: 3px; }
  .visual-body { padding: 15px; }
  .visual-flow { grid-template-columns: repeat(2, 1fr); }
  .timing-effects { gap: 6px; }
  .timing-effects strong { font-size: 21px; }
  .timing-adjust { display: grid; }
  .track-comparison { gap: 10px; }
  .track-cell { width: 100px; }
  .track-cell.tall { height: 135px; }
  .track-cell.short { height: 100px; }
  .track-tradeoff { font-size: 11px; }
  .mastered-toolbar { grid-template-columns: 1fr; }
}

@media print {
  .visual-card { box-shadow: none; break-inside: avoid; }
  .visual-card > * { display: block !important; }
  .visual-card > summary { display: none !important; }
  .visual-toggle, .review-shortcut-hint { display: none !important; }
}