/* Keep the collection's CNN worksheet as the shared visual baseline. */
@import url('../cnn/styles.css');
:root{--pale:#e9f1e8}
html{scroll-behavior:auto;scroll-padding-top:110px}
.lecture-label{margin-left:auto;font:11px var(--mono);color:var(--muted);letter-spacing:.06em}
.topbar .text-btn{white-space:nowrap}.intro>p{position:static;max-width:42em}.intro{padding-bottom:30px}
.lesson-explanation p+p{margin-top:14px}
.architecture-experiment{display:block;padding:24px;margin-top:18px}
.architecture-experiment .controls{display:flex;gap:20px;flex-wrap:wrap;padding:18px;background:#f3f4eb;border-radius:10px;margin:18px 0}
.architecture-experiment .controls label{flex:1 1 160px;margin:0}
.architecture-experiment output{float:none;font:13px var(--mono)}
.architecture-experiment .task{font-size:15px;line-height:1.8}
.caption,.notation-note{font-size:13px;line-height:1.7;color:var(--muted)}
.readout{font-size:14px;line-height:1.85;padding:16px 18px;background:#edf2e6;border:1px solid #ccdcca;border-radius:10px;margin:20px 0;font-variant-numeric:tabular-nums}
.readout strong{color:var(--deep);font-size:20px}.readout .error{color:var(--orange)}
.question label{margin:0 0 12px;font-size:16px;line-height:1.8;font-weight:400}.question label>b{color:var(--orange);font:12px var(--mono);margin-right:6px}
textarea{display:block;width:100%;resize:vertical;font:15px/1.7 var(--sans);color:var(--ink);border:1px solid #cfcebc;border-radius:8px;background:var(--white);padding:12px;margin:12px 0}
textarea:focus-visible{outline:3px solid #b27715;outline-offset:3px}
.answer-fold{border:0;background:transparent;margin:10px 0 16px;border-radius:0}.answer-fold summary{display:inline-block;font:600 13px var(--sans);border:1px solid var(--line);border-radius:999px;background:var(--white);color:var(--muted);padding:6px 14px}.answer-fold p{background:var(--white);border-left:3px solid var(--orange);padding:12px 16px;font-size:15px;line-height:1.8;margin:12px 0}
.reference-diagram{overflow:auto}.reference-diagram figure{margin:16px 0}.reference-diagram img{display:block;width:100%;min-width:660px}.reference-diagram figcaption{font-size:12px;line-height:1.7;margin:10px 0}.reference-diagram figcaption a{display:inline-block;margin-left:8px}
.problem-visual .pixel-table td{min-width:38px;height:38px;font-size:16px}.problem-visual .pixel-table caption{font-size:13px;line-height:1.5}.problem-visual .shape-problem strong{display:block;font:22px/1.6 var(--mono);margin:14px 0;color:var(--deep)}.problem-visual .shape-problem b,.problem-visual .scale-problem b{font-size:14px}.problem-visual p{font-size:14px;line-height:1.8}.problem-visual .architecture-choices{gap:22px}.problem-visual .architecture-choices p{margin-bottom:0}
.table-wrap{overflow:auto}.table-wrap table{min-width:560px}.mobile-hint{display:none}
.comparison{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin:25px 0}.comparison>div{border-left:3px solid var(--teal);padding-left:18px}.comparison b{font-size:14px}.comparison p{margin:8px 0}.comparison strong{font:30px Georgia,serif}.matrices{display:flex;align-items:flex-start;flex-wrap:wrap;gap:22px;margin:20px 0}.matrix-group{max-width:100%;text-align:center}.matrix-group>p{font-size:14px;margin:8px 0;font-weight:600}.matrix{display:grid;grid-template-columns:repeat(var(--n),44px);gap:3px}.cell{height:44px;display:grid;place-items:center;background:#f0f1e9;border:1px solid var(--line);font:500 18px ui-monospace,monospace;font-variant-numeric:tabular-nums;color:var(--ink)}.cell.selected{background:var(--gold);border-color:#a87836}.flow{display:flex;flex-wrap:wrap;gap:12px}.flow span{padding:10px 14px;background:var(--pale);font-size:15px}.plot svg{display:block;width:100%;overflow:visible}.plot text{font:12px system-ui;fill:var(--ink)}.bar-row{margin:18px 0}.bar-label{font-size:14px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:4px}.track{height:17px;background:#ecefe8;margin-top:6px}.bar{height:100%;background:var(--teal)}.bar.secondary{background:var(--orange)}/* Guided concept storyboards retain readable HTML labels at every width. */
.walkthrough{margin:32px 0;padding:26px;background:#fffefa;border:1px solid var(--line);border-radius:10px}.walkthrough h3{margin:8px 0 22px}.story-toolbar{display:flex;flex-wrap:wrap;gap:9px}.story-toolbar button{font-size:14px;min-height:44px}.story-toolbar button[aria-pressed=true]{background:var(--teal);color:#fffefa}.story-toolbar button:disabled{opacity:.45;cursor:default}.story-counter{font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums}.story-scene{padding:20px 0;min-width:0}.story-scene svg{width:100%;display:block}.story-scene svg text{font:12px system-ui;fill:var(--ink)}.story-route{display:grid;gap:12px}.story-node{border:1px solid var(--line);padding:15px;border-radius:6px;background:var(--paper);min-width:0;transition:background-color .4s,border-color .4s}.story-node span{display:block;font-size:13px;color:var(--muted)}.story-node strong{display:block;font-size:20px;font-weight:600;overflow-wrap:anywhere}.story-node.is-active{background:var(--pale);border-color:var(--teal);box-shadow:inset 4px 0 var(--teal)}.story-lanes,.story-branches{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.route-arrow{text-align:center;font-size:14px;color:var(--teal);margin:8px 0}.story-narration{border-top:1px solid var(--line);padding-top:18px;min-height:140px}.story-narration h4{margin:0 0 10px}.story-narration p{margin:0}.story-metrics{display:flex;flex-wrap:wrap;gap:14px;font-size:14px}.story-metrics b{font-size:20px;display:block}.channel-stack{display:flex;min-height:44px;opacity:.25;transition:opacity .5s}.channel-stack.complete{opacity:1}.channel-stack span{display:grid;place-items:center;min-width:32px;background:#c8ddd0;color:var(--ink);font-size:16px}.channel-stack span:nth-child(2){background:#e7d7b5}.channel-stack span:nth-child(3){background:#b9d4de}.channel-stack span:nth-child(4){background:#d7cce0}.story-matrix-row{display:flex;flex-wrap:wrap;justify-content:center;gap:22px}.story-grid-group b{display:block;text-align:center;font-size:14px;margin-bottom:10px}.story-grid{display:grid;grid-template-columns:repeat(var(--columns),40px);gap:4px}.story-grid span{display:grid;place-items:center;height:40px;background:var(--paper);border:1px solid var(--line);font:18px ui-monospace,monospace}.story-grid span.is-active{background:var(--gold);border-color:#a87836}.story-grid-group{margin:5px 0}@media(max-width:600px){.walkthrough{padding:18px}.story-lanes,.story-branches{grid-template-columns:1fr}.story-node strong{font-size:18px}.story-matrix-row{gap:14px}.story-narration{min-height:0}}@media(prefers-reduced-motion:reduce){.story-node,.channel-stack{transition:none}}@media print{.story-toolbar{display:none}.walkthrough{break-inside:avoid}.story-narration{min-height:0}.channel-stack{opacity:1}}

/* Match the reference's lab surfaces and compact playback tools. */
.walkthrough{border-radius:var(--radius);padding:24px;margin:0;background:var(--white)}
.walkthrough h3{font:600 21px/1.3 var(--display);letter-spacing:-.035em}
.walkthrough .eyebrow{font-size:10px}.story-toolbar button{font:500 12px var(--sans)}
.story-narration h4,.architecture-experiment h4{font:600 18px/1.4 var(--display);letter-spacing:-.025em}.story-narration p{font-size:15px;line-height:1.85}
.story-grid span.is-active,.cell.selected{background:#f4e5cd;border-color:var(--orange);box-shadow:inset 0 0 0 1px var(--orange)}
.story-grid span,.cell{font-family:var(--mono)}.comparison strong{font:600 25px var(--mono)}
@media(max-width:900px){.sidebar nav a{font-size:12px}.lecture-label{font-size:10px}}
@media(max-width:640px){.topbar{height:74px;flex-wrap:nowrap}.topbar .brand{order:0}.lecture-label{order:1;font-size:9px}.topbar .text-btn{order:2;max-width:none}.sidebar{top:74px}.lab{scroll-margin-top:145px}html{scroll-padding-top:145px}.architecture-experiment,.walkthrough{padding:16px}.architecture-experiment .controls{padding:14px;gap:18px}.question label{font-size:15px}.reference-diagram img{min-width:660px}.story-grid{grid-template-columns:repeat(var(--columns),38px)}.story-grid span{height:38px;font-size:17px}.matrix{grid-template-columns:repeat(var(--n),36px)}.cell{height:36px;font-size:17px}}
@media print{.topbar,.sidebar,.story-toolbar,.architecture-experiment .controls{display:none!important}.layout{display:block}main{padding:0}.lab{break-before:page}.reference-diagram img{min-width:0}.walkthrough,.architecture-experiment,.problem-visual{break-inside:avoid}.answer-fold:not([open]),.formula-fold:not([open]){display:none}.answer-fold[open] p{display:block}.table-wrap table{min-width:0}textarea{min-height:60px}}
/* Use a single anchor offset; keep matrix captions readable without stretching cells. */
html{scroll-padding-top:0}.lab{scroll-margin-top:110px}
.problem-panel .pixel-table caption{min-width:190px;text-align:left}
@media(max-width:640px){.lab{scroll-margin-top:145px}}