@charset "UTF-8";
:root{color-scheme:dark;--bg:#080e16;--surface:#101923;--surface2:#14212c;--ink:#e9f0ed;--muted:#94a6ad;--line:#263540;--mint:#b6efcf;--mint-dark:#20483d;--amber:#eabd83;--coral:#efa79d;--mono:"SFMono-Regular",Consolas,"Liberation Mono",monospace;--sans:-apple-system,BlinkMacSystemFont,"Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif;--serif:"Noto Serif TC","Songti TC","PMingLiU",serif}
*{box-sizing:border-box}html{background:var(--bg);scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:19px/1.65 var(--sans);-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button{cursor:pointer;color:inherit;background:none;border:0}button:disabled{cursor:default;opacity:.38}button,a,input,select{outline-offset:5px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid 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@keyframes stage-in{from{opacity:0;transform:translateY(9px)}to{opacity:1;transform:translateY(0)}}
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@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
/* Keep the central learning action legible, including classroom projection. */
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@keyframes gap-arrive{from{transform:translateY(-4px);border-color:#ffe2ae}to{transform:translateY(0)}}
@media(min-width:1101px){.stage:not(.explorer) .playground:not(.local-mini) .cell{width:61px;height:57px}.stage{padding-top:28px}.chapter-heading{margin-bottom:24px}}
@media(max-width:480px){.chapter-heading .lead{font-size:18px}.scene-context>p,.feedback,.choice{font-size:18px}.candidate .candidate-name{font-size:16px}.candidate .candidate-name small{font-size:14px}.gap-playground .path-preview{height:110px}.gap-playground .sequence-pair{padding:10px 0}.journey{gap:12px}}
.scene-context .completion-title{font:clamp(30px,3vw,44px)/1.45 var(--serif);color:var(--mint)}.matrix-source{margin-bottom:12px;font-size:15px;overflow-wrap:anywhere}
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.chapter-heading h1{text-wrap:balance}.matrix-wrap{max-height:520px}.matrix thead{position:sticky;top:0;z-index:3;background:var(--surface)}.matrix th:first-child{position:sticky;left:0;background:var(--surface);z-index:2}.matrix thead th:first-child{z-index:4}
@media(max-width:780px){.matrix-wrap{max-height:390px}}
.cell[data-action=cell-read]{cursor:default}
@media(max-width:780px){.local-mini .cell{font-size:16px}.local-mini .matrix th{font-size:15px}}
/* Classroom reading scale: body copy stays large on phones as well as projectors. */
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