.course-picker { margin: 20px 0 10px; border: 1px solid #48616f; border-radius: var(--radius-sm); }
.course-picker > summary { padding: 12px 14px; color: #eef5f6; font-weight: 600; cursor: pointer; font-size: 14px; }
.course-picker[open] > summary { border-bottom: 1px solid #48616f; }
.course-picker .course-lessons { display: flex; flex-direction: column; max-height: 330px; overflow-y: auto; padding: 6px; margin: 0; gap: 2px; }
.course-picker .course-lessons a { display: flex; gap: 9px; line-height: 1.5; padding: 10px 8px; }
.course-picker .course-lessons a span { flex-shrink: 0; }
.course-catalog { display: grid; grid-template-columns: 1fr 1fr; margin: 24px 0 32px; border-top: 1px solid var(--line); }
.course-catalog a { display: grid; grid-template-columns: 30px 1fr; column-gap: 12px; padding: 22px 18px 22px 0; border-bottom: 1px solid var(--line); text-decoration: none; color: var(--ink); }
.course-catalog a:hover strong { text-decoration: underline; text-underline-offset: 4px; }
.course-catalog .catalog-number { color: var(--accent); font-weight: 650; grid-row: span 2; }
.course-catalog strong { font-size: 17px; line-height: 1.5; }
.course-catalog a > span:last-child { color: var(--muted); font-size: 14px; line-height: 1.75; margin-top: 6px; }
.full-course .lesson-section > p, .foundation-depth > p { max-width: 78ch; line-height: 1.95; word-break: keep-all; overflow-wrap: anywhere; }
.course-bridge { color: var(--accent); border-left: 3px solid var(--accent); padding: 8px 0 8px 18px; margin: 24px 0; }
.course-deliverable { display: flex; flex-direction: column; gap: 8px; padding: 24px; margin-top: 28px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.course-deliverable strong { font-size: 19px; line-height: 1.6; }
.course-visual { margin: 30px 0; padding: 25px; background: var(--canvas); border: 1px solid var(--line); border-radius: var(--radius); }
.course-visual ol { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); list-style: none; padding: 0; margin: 0; gap: 20px; }
.course-visual li { position: relative; display: flex; flex-direction: column; gap: 9px; padding: 17px 14px; margin: 0; border: 1px solid var(--line); border-top: 3px solid var(--accent); background: var(--paper); border-radius: var(--radius-sm); min-width: 0; }
.course-visual li:not(:last-child)::after { content: '→'; position: absolute; right: -17px; top: 46%; color: var(--muted); font-size: 15px; }
.course-visual strong { font-size: 16px; line-height: 1.5; }
.course-visual li > span:not(.visual-index) { font-size: 14px; color: var(--muted); line-height: 1.65; overflow-wrap: anywhere; }
.visual-index { font-size: 12px; letter-spacing: .04em; color: var(--accent); font-weight: 700; font-variant-numeric: tabular-nums; }
.course-visual figcaption, .evaluation-bars figcaption { color: var(--muted); font-size: 14px; line-height: 1.75; margin-top: 18px; }
.course-visual .state-blocked { border-top-color: var(--error); background: var(--error-soft); }
.course-visual .state-review { border-top-color: var(--warning); background: var(--warning-soft); }
.course-visual .state-pending, .course-visual .state-neutral { border-top-color: var(--muted); }
.visual-state { font-size: 12px; font-weight: 600; color: var(--muted); }
.state-blocked .visual-state { color: var(--error); }
.state-review .visual-state { color: var(--warning); }
.state-pass .visual-state { color: var(--accent); }
.course-visual.lanes li::after { display: none; }
.course-visual.timeline li { border-top: 0; border-bottom: 3px solid var(--accent); border-radius: 0; }
.course-visual.versions li:first-child, .course-visual.retrieval li:first-child { background: var(--accent-soft); }
.result-visual ol { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
.foundation-depth { margin-top: 40px; padding-top: 28px; border-top: 1px solid var(--line); }
.foundation-depth h2, .reading-block h2 { font-size: 23px; line-height: 1.5; margin-bottom: 14px; }
.reading-block { margin: 26px 0 34px; max-width: 78ch; }
.reading-block p { line-height: 1.95; }
.prediction { border-left: 3px solid var(--warning); background: var(--warning-soft); padding: 18px 22px; margin: 24px 0; }
.prediction p { margin: 8px 0 0; line-height: 1.75; }
.experiment-instructions { padding-left: 24px; line-height: 1.8; }
.experiment-instructions li { padding: 5px 0 5px 4px; }
.course-controls { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 18px; }
.course-controls label { display: flex; flex-direction: column; gap: 8px; font-size: 15px; font-weight: 600; }
.course-controls select { width: 100%; min-width: 0; min-height: 46px; font: inherit; font-weight: 400; padding: 10px 30px 10px 12px; color: var(--ink); background: var(--paper); border: 1px solid #82968e; border-radius: var(--radius-sm); }
.course-lab > button { margin-top: 20px; }
.course-result { background: var(--paper); }
.course-result .result-heading { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 12px; }
.result-heading h3 { font-size: 22px; margin: 0; line-height: 1.5; }
.course-result .badge { white-space: normal; overflow-wrap: anywhere; }
.course-result .course-visual { margin: 24px 0; }
.course-table { width: 100%; }
.course-table td { overflow-wrap: anywhere; max-width: 360px; }
.course-table td:last-child { white-space: normal; }
.result-comparison { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.result-comparison section { min-width: 0; border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 18px; }
.result-comparison h4 { margin: 0 0 12px; font-size: 16px; }
.result-comparison pre, .result-artifact pre { white-space: pre-wrap; overflow-wrap: anywhere; font-size: 14px; line-height: 1.8; font-family: 'Pretendard Variable', sans-serif; }
.result-artifact { margin: 22px 0; border-top: 1px solid var(--line); padding-top: 16px; }
.result-artifact summary, .course-sources summary, .chapter-reflection summary { cursor: pointer; font-weight: 600; padding: 8px 0; }
.result-scope { color: var(--muted); font-size: 13px; line-height: 1.75; margin-top: 24px; }
.inline-return { display: inline-block; color: var(--accent); margin: 16px 0; font-weight: 600; text-underline-offset: 4px; }
.design-choice { margin: 22px 0 28px; }
.design-choice > div { display: grid; grid-template-columns: 95px 1fr; gap: 12px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.design-choice dt { color: var(--accent); font-weight: 650; }
.design-choice dd { margin: 0; line-height: 1.85; }
.course-sources { margin-top: 28px; color: var(--muted); font-size: 14px; line-height: 1.8; overflow-wrap: anywhere; }
.evaluation-bars { margin: 24px 0; padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); }
.evaluation-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; margin: 0 0 24px; }
.evaluation-row svg { grid-column: 1 / -1; height: 16px; width: 100%; }
.bar-track { fill: var(--line); stroke: none; }
.bar-fill { fill: var(--accent); stroke: none; }
[hidden] .course-visual li::after { content: none !important; }
.version-tree, .time-figure, .retrieval-map { margin: 28px 0; }
.version-tree figcaption, .time-figure figcaption, .retrieval-map figcaption { color: var(--muted); font-size: 14px; line-height: 1.75; margin-top: 16px; }
.version-branch { display: grid; grid-template-columns: 150px 1fr; align-items: center; gap: 32px; margin: 18px 0; }
.document-node { position: relative; background: var(--nav); color: white; padding: 20px; border-radius: var(--radius-sm); text-align: center; }
.document-node::after { content: ''; position: absolute; width: 32px; border-top: 2px solid var(--accent); right: -32px; top: 50%; }
.version-branch ul { border-left: 2px solid var(--accent); padding: 0 0 0 24px; list-style: none; }
.version-branch li { position: relative; display: flex; gap: 18px; padding: 14px 18px; margin: 10px 0; border: 1px solid var(--line); border-radius: var(--radius-sm); }
.version-branch li::before { content: ''; width: 24px; border-top: 2px solid var(--accent); position: absolute; left: -26px; top: 50%; }
.time-figure { border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 20px; }
.time-figure h4 { margin: 0 0 20px; font-size: 16px; line-height: 1.75; }
.time-row { display: grid; grid-template-columns: 110px repeat(5, minmax(0, 1fr)); border-bottom: 1px solid var(--line); font-size: 13px; }
.time-row > * { padding: 14px 5px; text-align: center; display: flex; align-items: center; justify-content: center; line-height: 1.5; border-left: 1px solid var(--line); }
.time-row > :first-child { text-align: left; border-left: 0; justify-content: flex-start; }
.time-event { background: var(--warning-soft); color: var(--warning); }
.time-selected, .time-cutoff { background: var(--accent-soft); color: var(--accent); font-weight: 650; }
.time-mobile { display: none; }
.retrieval-map { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.retrieved-document { padding: 20px; border: 2px dashed var(--line); border-radius: var(--radius-sm); }
.retrieved-document.is-found { border: 2px solid var(--accent); background: var(--accent-soft); }
.retrieved-document p { font-size: 15px; margin: 12px 0; }
.retrieved-document span, .retrieved-document small { display: block; font-size: 13px; line-height: 1.75; color: var(--muted); }
.retrieval-map figcaption { grid-column: 1 / -1; }
@media (max-width: 1100px) {
  .course-visual ol { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .course-visual li:nth-child(2n)::after { display: none; }
  .course-visual { padding: 20px; }
}
@media (max-width: 700px) {
  .course-picker { margin: 8px 0 12px; }
  .course-picker .course-lessons { display: flex; max-height: 260px; }
  .course-catalog { grid-template-columns: 1fr; }
  .course-catalog a { padding-right: 0; }
  .course-visual { padding: 16px; margin: 24px 0; }
  .course-visual ol { grid-template-columns: 1fr; gap: 16px; }
  .course-visual li { padding: 14px; display: grid; grid-template-columns: 28px 1fr; gap: 6px 10px; }
  .course-visual li > .visual-index { grid-row: span 3; }
  .course-visual li > span:not(.visual-index), .course-visual .visual-state { grid-column: 2; }
  .course-visual li:not(:last-child)::after { content: '↓'; top: auto; right: auto; left: 25px; bottom: -20px; display: block; }
  .course-visual.lanes li::after { display: none; }
  .course-controls { grid-template-columns: minmax(0, 1fr); }
  .result-comparison { grid-template-columns: 1fr; }
  .design-choice > div { grid-template-columns: 1fr; gap: 6px; }
  .foundation-depth h2, .reading-block h2 { font-size: 21px; }
  .result-heading h3 { font-size: 20px; }
  .course-deliverable { padding: 20px 0; }
  .version-branch { grid-template-columns: 1fr; gap: 8px; }
  .document-node::after { display: none; }
  .version-branch li { flex-direction: column; gap: 4px; }
  .time-figure { padding: 14px; }
  .time-grid { display: none; }
  .time-mobile { display: grid; gap: 12px; padding: 0; margin: 0; list-style: none; }
  .time-mobile li { display: flex; flex-direction: column; gap: 8px; padding: 16px; border: 1px solid var(--line); border-left: 3px solid var(--muted); border-radius: var(--radius-sm); }
  .time-mobile .time-selected { border-left-color: var(--accent); }
  .time-mobile .time-conflict { border-left-color: var(--warning); background: var(--warning-soft); color: var(--warning); }
  .time-mobile span, .time-mobile small { font-size: 13px; line-height: 1.75; }
  .retrieval-map { grid-template-columns: 1fr; }
}