/* Course styles reuse DESIGN.md colors, type sizes, radii and spacing. */
.course-wrap { max-width: 1120px; margin: 0 auto; padding: 32px 24px 48px; color: var(--text); font-size: 14px; line-height: 1.6; }
.course-wrap [hidden] { display: none !important; }
.course-wrap *, .course-wrap *::before, .course-wrap *::after { box-sizing: border-box; }
.course-wrap a { color: var(--teal-dark); }
.course-wrap :is(button,a,input,summary):focus-visible { outline: 2px solid var(--teal-dark); outline-offset: 4px; }
.course-wrap .btn-primary { background: var(--teal-dark); color: var(--bg); }
.course-wrap .btn-primary:hover { background: var(--teal-hover); }
.course-wrap h1, .course-wrap h2, .course-wrap p, .course-wrap figure { margin: 0; }
.course-wrap h1, .course-wrap h2 { font-weight: 500; letter-spacing: -0.02em; line-height: 1.3; }
.course-wrap h2 { font-size: 24px; }
.course-crumb { display: flex; flex-wrap: wrap; gap: 8px; color: var(--text-sec); margin-bottom: 32px; }
.course-crumb a { color: var(--text-sec); text-decoration: none; }
.course-eyebrow, .course-progress-label, .course-drawing-label, .course-given-band-tag { font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-sec); }
.course-wrap .course-eyebrow { color: var(--teal-dark); margin-bottom: 12px; }
.course-hub-hero { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: center; padding: 24px 0 40px; }
.course-wrap .course-h1 { font-size: 32px; margin-bottom: 20px; }
.course-wrap .course-intro { color: var(--text-sec); margin: 12px 0 24px; max-width: 64ch; }
.course-wrap .course-hero-note { color: var(--text-sec); margin-top: 16px; }
.course-hub-drawing { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.course-hub-drawing figcaption { color: var(--text-sec); text-align: center; }
.course-outcomes { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 24px 0; margin-bottom: 40px; }
.course-outcomes ul { display: grid; grid-template-columns: repeat(2,1fr); gap: 12px 32px; padding-left: 20px; margin: 0; }
.course-outcomes li::marker { color: var(--teal-dark); }
.course-curriculum-heading { margin-bottom: 24px; }
.course-curriculum-heading p { color: var(--text-sec); margin-top: 8px; }
.course-lesson-list { list-style: none; display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; padding: 0; margin: 0 0 24px; }
.course-lesson-item { border: 1px solid var(--border); border-radius: 10px; background: var(--bg); transition: border-color 160ms, box-shadow 160ms; }
.course-lesson-item:hover { border-color: var(--teal); box-shadow: var(--shadow-md); }
.course-lesson-link { display: flex; height: 100%; gap: 16px; padding: 24px; text-decoration: none; }
.course-lesson-order { font: 24px monospace; color: var(--teal-dark); padding-top: 4px; }
.course-lesson-title { display: block; color: var(--text); font-weight: 600; }
.course-lesson-desc { display: block; color: var(--text-sec); margin-top: 8px; }
.course-lesson-done { display: block; margin-top: 12px; color: var(--teal-dark); font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; }
.course-card-arrow { margin-left: auto; flex-shrink: 0; }
.course-scope { color: var(--text-sec); padding: 16px 0; }
.course-progress { max-width: 240px; margin-bottom: 20px; }
.course-progress-track { height: 4px; background: var(--border); border-radius: 999px; margin-top: 8px; overflow: hidden; }
.course-progress-fill { height: 100%; background: var(--teal); }
.course-wrap .course-lesson-h1 { font-size: 32px; max-width: 28ch; }
.course-worked-summary { border-left: 2px solid var(--teal); padding: 4px 0 4px 16px; margin-bottom: 24px !important; }
.course-worked-summary .course-eyebrow { display: block; margin-bottom: 4px; }
.course-given-band, .course-prereq-note { border-radius: var(--radius); padding: 12px 16px; margin-bottom: 16px; background: var(--surface); color: var(--text-sec); }
.course-given-band-tag { margin-bottom: 4px !important; }
.course-beat-nav { display: flex; gap: 0; list-style: none; padding: 0; margin: 28px 0 24px; overflow-x: auto; }
.course-beat-nav li { position: relative; display: flex; align-items: center; gap: 8px; min-width: 120px; padding: 8px 20px 8px 0; color: var(--text-sec); }
.course-beat-nav li::after { content: ""; position: absolute; height: 1px; background: var(--border); left: 32px; right: 0; bottom: 0; }
.course-beat-nav li[aria-current] { color: var(--teal-dark); }
.course-beat-nav li[aria-current]::after, .course-beat-nav li.is-past::after { height: 3px; background: var(--teal); }
.course-beat-nav li span:first-child { display: grid; place-items: center; width: 24px; height: 24px; border: 1px solid var(--border); border-radius: 50%; font-family: monospace; flex-shrink: 0; }
.course-beat-nav li[aria-current] span:first-child, .course-beat-nav li.is-past span:first-child { border-color: var(--teal); background: var(--teal-light); }
.course-beat-nav li span:last-child { white-space: nowrap; }
.course-beat { scroll-margin-top: 24px; margin-bottom: 24px; }
.course-beat:focus { outline: none; }
.course-beat-heading { margin-bottom: 20px; }
.course-controls { padding: 24px; border: 1px solid var(--border); border-radius: 12px; }
.course-lesson-notes { border-top: 1px solid var(--border); padding-top: 24px; }
.course-lesson-notes > h2 { margin-bottom: 24px; }
.course-full-notes { margin-bottom: 24px; border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.course-full-notes summary { cursor: pointer; color: var(--teal-dark); }
.course-full-notes section { padding-top: 24px; max-width: 72ch; }
.course-full-notes h3, .course-full-notes h4 { font: inherit; font-weight: 600; margin: 0 0 8px; }
.course-note-example { margin-top: 16px; }
.course-cover-label { position: absolute; transform: translate(-50%, -100%); padding: 4px 8px; color: var(--teal-dark); background: var(--bg); border: 1px solid var(--teal); border-radius: var(--radius); font: 14px monospace; white-space: nowrap; pointer-events: none; }
.course-beat-heading p:last-child { color: var(--text-sec); margin-top: 8px; max-width: 80ch; }
.course-explorer { display: grid; grid-template-columns: minmax(0,1.2fr) minmax(0,1fr); gap: 32px; align-items: start; }
.course-explorer.course-explorer-text { grid-template-columns: 1fr; }
.course-explorer-text .course-controls { max-width: 72ch; width: 100%; margin: 0 auto; }
.course-concept-detail { border-top: 1px solid var(--border); margin: 20px 0; padding-top: 20px; }
.course-concept-detail p { margin-bottom: 12px; }
.course-concept-rule { color: var(--teal-dark); font-family: monospace; }
.course-concept-note { color: var(--text-sec); }
.course-concept-diagram { width: 100%; display: block; margin: 12px 0; }
.course-concept-diagram text { fill: var(--text-sec); font: 14px monospace; }
.concept-outside { fill: none; stroke: var(--text-sec); stroke-width: 3; stroke-dasharray: 8 6; }
.concept-centreline { fill: none; stroke: var(--teal-dark); stroke-width: 6; }
.course-concept-diagram .concept-accent-text { fill: var(--teal-dark); }
.concept-hook { stroke: var(--teal); stroke-linecap: butt; }
.concept-minimum { stroke: var(--amber); stroke-width: 3; stroke-dasharray: 4 4; }
.course-diagram[data-kind="hook"] path { stroke-width: var(--course-bar-width); }
.course-scene { position: relative; background: var(--surface); border-radius: 12px; padding: 20px; margin-bottom: 12px !important; user-select: none; -webkit-touch-callout: none; overflow: hidden; }
.course-drawing-label { display: flex; justify-content: space-between; gap: 12px; }
.course-diagram { display: block; width: 100%; height: auto; overflow: visible; }
.course-diagram text { font-family: monospace; font-size: 14px; fill: var(--text-sec); }
.diagram-concrete { fill: var(--border); stroke: var(--text-sec); stroke-width: 1; }
.diagram-steel { fill: none; stroke: var(--teal-dark); stroke-width: 4; }
.diagram-muted { fill: none; stroke: var(--text-sec); stroke-width: 4; }
.diagram-dimension { fill: none; stroke: var(--teal-dark); stroke-width: 2; }
.diagram-active { stroke: var(--teal); stroke-width: 6; stroke-linecap: round; }
.diagram-main-bar { fill: var(--text-sec); }
.course-diagram[data-highlight="cover"] .diagram-concrete { fill: var(--teal-light); stroke: var(--teal); stroke-width: 2; }
.course-diagram[data-highlight="diameter"] .diagram-steel { stroke-width: 8; }
.course-diagram[data-highlight="hook"] .diagram-steel { stroke-dasharray: 16 4; }
.course-scene figcaption { text-align: center; color: var(--text-sec); }
.course-3d-canvas { display: block; width: 100%; max-width: 100%; height: auto; touch-action: pan-y; cursor: grab; }
.course-3d-canvas.is-dragging { cursor: grabbing; }
.course-scene.has-3d .course-diagram { display: none; }
.course-3d-details { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 16px; font: 14px monospace; color: var(--teal-dark); margin: 12px 0; }
.course-3d-tools { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 8px; margin: 12px 0; color: var(--text-sec); font-size: 11px; }
.course-3d-tools button { min-width: 44px; min-height: 44px; padding: 8px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg); color: var(--teal-dark); cursor: pointer; font: inherit; }
.course-3d-tools button:hover { border-color: var(--teal-dark); }
.course-review-link { margin-left: 16px; }
.course-load-3d { display: block; margin: 0 0 16px auto; }
.course-lesson[data-scene-available="false"] [data-load-3d] { display: none; }
.course-option-buttons { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.course-option { border: 1px solid var(--border); border-radius: 8px; background: var(--bg); padding: 12px 16px; color: var(--text); cursor: pointer; font: inherit; }
.course-option[aria-pressed="true"] { background: var(--teal-light); border-color: var(--teal); color: var(--teal-dark); }
.course-option:hover { border-color: var(--teal-dark); }
.course-result-label { color: var(--text-sec); margin-bottom: 4px !important; }
.course-wrap .course-result { font: 32px monospace; color: var(--teal-dark); margin-bottom: 20px; overflow-wrap: anywhere; }
.course-result span { display: block; color: var(--text-sec); font: 14px Inter,system-ui,sans-serif; margin-top: 8px; }
.course-explanation { max-width: 54ch; }
.course-readout > div { margin-bottom: 24px; }
.course-metrics { display: flex; flex-wrap: wrap; gap: 16px 24px; border-top: 1px solid var(--border); margin: 20px 0 0; padding-top: 16px; }
.course-metrics dt { color: var(--text-sec); font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; }
.course-metrics dd { font-family: monospace; margin: 4px 0 0; }
.course-reset { border: 0; background: none; padding: 12px 0; font: inherit; color: var(--text-sec); text-decoration: underline; text-underline-offset: 4px; cursor: pointer; }
.course-step-actions { display: flex; justify-content: flex-end; gap: 12px; margin: 24px 0 32px; }
.course-step-actions button:disabled { opacity: 0.5; cursor: default; }
.course-practice { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; padding: 32px; border-radius: 12px; background: var(--teal-light); border: 1px solid var(--teal); margin: 32px 0; scroll-margin-top: 24px; }
.course-practice h2 { margin-bottom: 12px; }
.course-practice-form label { display: block; margin-bottom: 8px; }
.course-answer-row { display: flex; gap: 8px; }
.course-answer-row input { min-width: 0; width: 100%; border: 1px solid var(--border); border-radius: 8px; padding: 12px; font: 14px monospace; background: var(--bg); color: var(--text); }
.course-answer-row button { flex-shrink: 0; }
#practice-feedback { margin-top: 12px; min-height: 24px; }
#practice-feedback.is-correct { color: var(--teal-dark); font-weight: 600; }
.course-solution summary { cursor: pointer; color: var(--teal-dark); padding: 8px 0; }
.course-solution p { margin: 8px 0 0; }
.course-takeaway { padding: 0 0 24px 20px; border-left: 2px solid var(--teal); margin-bottom: 32px; }
.course-skeleton { margin: 32px 0; }
.course-skeleton-intro { color: var(--text-sec); margin: 8px 0 16px !important; }
.course-skeleton-scroll { overflow-x: auto; }
.course-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.course-table caption { text-align: left; color: var(--text-sec); padding-bottom: 12px; }
.course-table th, .course-table td { border-bottom: 1px solid var(--border); padding: 12px; text-align: left; }
.course-table th { font-weight: 500; background: var(--surface); }
.course-table td { font-family: monospace; }
.course-table td:first-child { color: var(--teal-dark); font-weight: 600; }
.course-skeleton-note { margin-top: 12px !important; color: var(--text-sec); }
.course-skeleton-unavailable { color: var(--text-sec); }
.course-lesson-navigation { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin: 32px 0; }
.course-lesson-navigation .btn { white-space: normal; text-align: left; }
.course-closing-question { color: var(--text-sec); margin: 24px 0 !important; }
.course-waitlist { border: 1px solid var(--border); border-radius: 12px; padding: 24px; background: var(--surface); }
.course-waitlist-copy { color: var(--text-sec); margin: 8px 0 16px !important; }
.course-waitlist-fields { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; margin-bottom: 16px; }
.course-waitlist-fields input { width: 100%; font: inherit; padding: 12px; border: 1px solid var(--border); border-radius: var(--radius); }
.course-waitlist-fields label { display: block; margin-bottom: 4px; color: var(--text-sec); }
.course-waitlist-error { margin-bottom: 12px !important; }
.course-waitlist-done { color: var(--teal-dark); }
@media (max-width: 760px) {
 .course-wrap { padding: 24px 16px 40px; }
 .course-hub-hero, .course-explorer, .course-practice { grid-template-columns: 1fr; gap: 24px; }
 .course-hub-hero { padding-top: 8px; }
 .course-lesson-list { grid-template-columns: 1fr; }
 .course-wrap .course-lesson-h1 { font-size: 24px; }
 .course-beat-nav { padding-bottom: 8px; }
 .course-beat-nav li { flex: 0 0 auto; min-width: 104px; }
 .course-beat-nav li span:last-child { display: none; }
 .course-beat-nav li:last-child span:last-child { display: inline; }
 .course-practice { padding: 24px; }
 .course-scene { padding: 16px; }
 .course-diagram { max-height: 320px; }
 .course-lesson-navigation { align-items: stretch; flex-direction: column; }
}
@media (max-width: 640px) {
 .course-outcomes ul, .course-waitlist-fields { grid-template-columns: 1fr; }
 .course-lesson-link { padding: 20px; }
 .course-skeleton-table, .course-skeleton-table tbody, .course-skeleton-table tr, .course-skeleton-table td { display: block; }
 .course-skeleton-table caption { display: block; width: 100%; }
 .course-skeleton-table thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
 .course-skeleton-table tr { border: 1px solid var(--border); border-radius: 8px; margin-bottom: 16px; padding: 8px; }
 .course-skeleton-table td { display: flex; justify-content: space-between; gap: 16px; padding: 8px; text-align: right; }
 .course-skeleton-table td::before { content: attr(data-label); color: var(--text-sec); font: 11px Inter,system-ui,sans-serif; text-transform: uppercase; letter-spacing: 0.5px; text-align: left; min-width: 100px; }
 .course-answer-row { flex-wrap: wrap; }
 .course-answer-row .btn { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
 .course-wrap *, .course-wrap *::before, .course-wrap *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}