@font-face{font-family:Geist;font-style:normal;font-weight:400 500;font-display:swap;src:url(/static/fonts/Geist-Regular.woff2)}
@font-face{font-family:Geist;font-style:normal;font-weight:600 700;font-display:swap;src:url(/static/fonts/Geist-SemiBold.woff2)}
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html[data-theme=dark]{--paper:#181818;--card:#1f1f1f;--wash:#272727;--ink:#f2f3f8;--muted:#acb3c4;--line:#383b42;--line2:#606a7d;--accent:#a8bcff;--accent-ink:#151b31;--tint:#272b39;--gold:#e3b66e;--error:#efa28f;--shadow:0 16px 48px #0002;color-scheme:dark}
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.reveal-pending{opacity:0;transform:translateY(32px);transition:opacity .8s var(--ease),transform .8s var(--ease)}.reveal-pending.is-revealed{opacity:1;transform:none}
@media(max-width:1000px){.brand-sub{display:none}.layout{grid-template-columns:192px minmax(0,1fr);gap:32px}.top .wrap{gap:16px;padding-inline:16px}.main-nav{gap:4px}.main-nav a{padding-inline:8px}.section-head h2{font-size:20px;line-height:28px}.exp-body{padding:24px}}
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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.reveal-pending{opacity:1;transform:none}*,*::before,*::after{transition:none!important;animation:none!important}}
@media print{body{padding:0;background:white;color:#111}.top,.sidebar,.mobile-nav,.readline,.toast,.button-row,.side-actions,dialog,.top-tools{display:none!important}.wrap{width:100%;max-width:none}.layout{display:block}.section{break-inside:avoid;margin-bottom:24px}.panel,.experiment,.task-box{background:white;border-color:#bbb}.reveal-pending{opacity:1;transform:none}.footer{margin-top:24px}.source-list a{color:#111}textarea{min-height:80px}.button-link{display:none!important}}

#info-content p+p{margin-top:16px}.toc a.active{font-weight:600}.toc a:hover:not(.active){background:var(--wash)}

/* Chengshi: library, course path and learning layout. */
.page{padding:64px 0 32px;min-height:70vh}.home-intro{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:center;padding:16px 0 64px}.home-intro h1{font-size:60px;line-height:1.15;letter-spacing:-.055em;margin-top:24px;max-width:680px;color:var(--ink);background:linear-gradient(110deg,#111827,#626b80);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}.home-intro .lede{font-size:18px;line-height:28px;color:var(--muted);max-width:480px;margin-top:24px}.hero-pill{display:inline-flex;align-items:center;gap:8px;font-size:12px;line-height:16px;padding:8px 12px;border:1px solid var(--line);border-radius:9999px;background:var(--card);color:var(--muted)}.hero-pill i{width:8px;height:8px;background:var(--accent);border-radius:50%}.hero-actions{display:flex;align-items:center;gap:16px;margin-top:32px}.hero-actions .button-link{padding-inline:24px;min-height:48px}.hero-proof{display:flex;gap:24px;flex-wrap:wrap;font-size:12px;line-height:20px;color:var(--muted);margin-top:24px}.hero-proof span{display:flex;gap:8px;align-items:center}.hero-proof .icon{width:16px;height:16px;color:var(--accent)}.hero-resume{margin-top:24px;font-size:12px;line-height:20px;color:var(--muted)}.hero-resume a{text-decoration:none;color:var(--accent);font-weight:600}.hero-feature{min-width:0}.hero-feature .knowledge-figure{box-shadow:0 24px 64px #3158c910}.hero-feature .diagram-caption{padding:24px 24px 0}.hero-feature .diagram-caption h3{font-size:18px;line-height:28px}.hero-feature .diagram-canvas{padding:8px}.hero-feature .diagram-focus,.hero-feature .diagram-footnote,.hero-feature .diagram-zoom,.hero-feature .motion-replay{display:none}.hero-feature .diagram-insight{font-size:12px;line-height:20px;padding:16px 24px;min-height:72px}.hero-feature .diagram-kicker{font-size:12px}.hero-feature 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1.05fr;overflow:hidden;box-shadow:var(--shadow)}.subject-card+.subject-card{margin-top:24px}.subject-copy{padding:40px;position:relative}.subject-copy .section-label{display:block}.subject-copy h3{font-size:36px;line-height:40px;margin-block:24px 16px}.subject-copy>p{font-size:16px;line-height:24px;color:var(--muted);max-width:400px}.subject-meta{display:flex;gap:16px;flex-wrap:wrap;color:var(--muted);font-size:12px;line-height:20px;margin-top:24px}.subject-actions{display:flex;align-items:center;gap:16px;margin-top:32px}.subject-actions .button-link{padding-inline:16px}.subject-actions>a:last-child:not(.button-link){font-size:14px;line-height:20px;text-decoration:none;color:var(--muted)}.big-glyph{display:none}.subject-outline{background:var(--tint);padding:32px;display:grid;grid-template-columns:1fr 1fr;gap:16px}.outline-item{display:flex;gap:12px;align-items:flex-start;padding:16px;border:1px solid color-mix(in srgb,var(--accent) 14%,transparent);background:color-mix(in 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.contract-editor{display:grid;grid-template-columns:1fr;gap:24px;margin-top:32px}
.contract-controls{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.contract-controls fieldset{min-width:0;border:0;padding:0;margin:0}
.contract-controls legend{font-size:14px;line-height:20px;font-weight:600;margin-bottom:12px}
.contract-controls legend span{font-size:12px;color:var(--accent);margin-right:8px}
.contract-controls select{width:100%;font-size:14px;line-height:20px;padding:12px;border:1px solid var(--line);border-radius:8px;background:var(--card);min-height:48px;text-overflow:ellipsis}
.contract-fields{display:grid;grid-template-columns:1fr 1fr;gap:12px 8px;padding-top:4px}
.contract-fields label{font-size:14px;line-height:20px;display:flex;align-items:center;gap:8px;min-height:32px;cursor:pointer}
.contract-fields input{accent-color:var(--accent);width:16px;height:16px;flex:none}
.contract-preview{padding:24px;background:var(--tint);border:1px solid var(--line);border-radius:16px;min-width:0}
.contract-preview>h4{font-size:20px;line-height:28px;margin-bottom:8px}
.contract-preview>p{font-size:14px;line-height:20px;color:var(--muted);margin-bottom:16px}
.lab-empty{padding:24px;background:var(--card);border:1px dashed var(--line2);border-radius:12px}
.lab-empty b{font-size:16px;line-height:24px;font-weight:600}
.lab-empty p,.lab-effect{font-size:14px;line-height:24px;color:var(--muted);margin-top:8px}
.lab-effect{font-variant-numeric:tabular-nums;margin-top:12px}
.contract-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:24px}
.contract-actions button{font-size:14px;line-height:20px;min-height:40px}
.contract-report{margin-top:24px;border:1px solid var(--line);padding:24px;border-radius:16px;background:var(--card)}
.contract-report h4{font-size:18px;line-height:28px;margin-bottom:16px}
.contract-report ul{padding:0;list-style:none;display:grid;gap:16px}
.contract-report li>span{font-size:14px;line-height:20px;font-weight:600}
.contract-report .check-pass>span{color:var(--accent)}
.contract-report .check-fail>span{color:var(--error)}
.contract-report .check-empty>span{color:var(--muted)}
.contract-report li p,.contract-report>p{font-size:14px;line-height:24px;color:var(--muted);margin-top:4px}
.contract-report>p{margin-top:16px}
.misuse-block{margin-bottom:32px}
.misuse-list{margin-top:16px;display:grid;gap:16px}
.misuse-item{display:flex;gap:24px;align-items:flex-start;padding:24px;border:1px solid var(--line);border-radius:16px;background:var(--card)}
.misuse-number{font-size:12px;line-height:28px;color:var(--gold);font-variant-numeric:tabular-nums;flex:none}
.misuse-item h3{font-size:18px;line-height:28px;margin-bottom:12px}
.misuse-item p{font-size:14px;line-height:24px;color:var(--muted);margin-top:8px}
.misuse-item p>b{font-weight:500;color:var(--ink);margin-right:12px;white-space:nowrap}
.misuse-item .misuse-instead>b{color:var(--accent)}
.quiz-transition{margin-bottom:24px}
.learning-links{display:grid;gap:16px}
.learning-links a{display:block;border:1px solid var(--line);border-radius:16px;padding:24px;background:var(--card);text-decoration:none;transition:background .3s var(--ease),border-color .3s var(--ease)}
.learning-links a:hover{background:var(--tint);border-color:var(--line2)}
.relation-label{font-size:12px;line-height:16px;color:var(--accent)}
.learning-links h3{font-size:20px;line-height:28px;display:flex;justify-content:space-between;gap:16px;margin-top:8px}
.learning-links h3 span{font-weight:400;color:var(--accent)}
.learning-links p{font-size:14px;line-height:24px;color:var(--muted);margin-top:12px;max-width:680px}
@media(max-width:1100px){.top .wrap{gap:16px}}
@media(max-width:900px){.top .wrap{width:calc(100% - 32px);height:64px;gap:12px}.top{top:0;border-radius:0}.worked-example{padding:24px}.method-steps li{padding:24px;gap:16px}}
@media(max-width:600px){.worked-example{padding:24px 16px;border-radius:16px}.method-steps li{padding:24px 16px}.contract-controls{grid-template-columns:1fr;gap:24px}.worked-tabs{grid-template-columns:1fr}.worked-tabs button{min-height:48px}.contract-preview,.contract-report{padding:16px}.lab-table th,.lab-table td{padding:12px;font-size:12px;line-height:20px;min-width:64px}.lab-table{min-width:320px}.worked-example #worked-panel{min-height:384px}.misuse-item{padding:24px 16px;gap:12px}.ai-application{padding:24px 16px}.learning-links a{padding:24px 16px}.lab-protocol{font-size:14px}}
@media print{.worked-tabs,.contract-actions,.contract-controls{display:none}.worked-example,.method-steps,.misuse-item,.learning-links a{break-inside:avoid}.lab-table-shell{overflow:visible}.contract-preview{background:white}#worked-panel{min-height:0}}

.lab-table .lab-date{white-space:nowrap;overflow-wrap:normal}.lab-scroll-hint{display:none}
@media(max-width:600px){.contract-preview .lab-table{min-width:480px}.lab-scroll-hint{display:block;font-size:12px;line-height:20px;color:var(--muted);margin-top:12px}}

.plain-talk{margin-bottom:24px;border:1px solid var(--line);border-radius:16px;background:var(--tint);padding:24px}.plain-talk>span{display:block;font-size:12px;line-height:16px;color:var(--accent);margin-bottom:12px}.plain-talk h3{font-size:20px;line-height:28px;margin-bottom:12px}.plain-talk p{font-size:16px;line-height:28px;color:var(--ink)}.worked-recap{padding-left:24px;margin-top:16px}.worked-recap li{margin-bottom:16px;font-size:14px;line-height:24px}.worked-recap p{color:var(--muted);margin-top:4px}.workbench-reference{margin-top:24px;border:1px solid var(--line);border-radius:16px;padding:24px;background:var(--card)}.workbench-reference h4{font-size:18px;line-height:28px;margin-bottom:12px}.workbench-reference>p,.workbench-reference li{font-size:14px;line-height:24px}.workbench-reference ul{padding-left:24px;margin-block:16px;color:var(--muted)}.workbench-empty{margin-top:16px;color:var(--gold);font-size:14px;line-height:24px}@media(max-width:600px){.plain-talk,.workbench-reference{padding:24px 16px}.plain-talk h3{font-size:18px;line-height:28px}}

.practice-update{font-size:14px;line-height:24px;padding:16px;border:1px solid var(--line);border-radius:12px;background:var(--tint);margin-top:16px;color:var(--muted)}

.knowledge-figure{margin:0;border:1px solid var(--line);border-radius:24px;background:var(--card);overflow:hidden;isolation:isolate;--kd-warm:#ad7828;--kd-warm-bg:#fcf1dd;--kd-danger-bg:#fbedeb;--kd-muted-bg:#f3f5f8;box-shadow:var(--shadow)}html[data-theme=dark] .knowledge-figure{--kd-warm:#e3b66e;--kd-warm-bg:#313028;--kd-danger-bg:#312727;--kd-muted-bg:#272727}.diagram-caption{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;padding:32px 32px 16px}.diagram-kicker{font-size:12px;line-height:16px;color:var(--accent);display:block;margin-bottom:12px}.diagram-kicker span{color:var(--muted)}.diagram-caption h3{font-size:20px;line-height:28px;letter-spacing:-.02em}.diagram-zoom{font-size:12px;line-height:16px;padding:8px 12px;min-height:40px;white-space:nowrap;background:var(--paper);border-radius:8px;font-weight:500}.diagram-zoom .icon{width:16px;height:16px}.diagram-canvas{margin:0 16px;padding:8px 0 16px;overflow:hidden;border-radius:16px;position:relative}.knowledge-svg{width:100%;height:auto;display:block;overflow:hidden}.diagram-canvas .knowledge-svg{max-height:400px}.knowledge-svg text{font-family:var(--sans);stroke:none!important;fill:var(--ink);letter-spacing:0}.kd-element{transition:opacity .3s var(--ease),stroke-width .3s var(--ease);vector-effect:non-scaling-stroke;stroke-width:1.5;stroke:var(--accent);fill:none;stroke-linejoin:round;stroke-linecap:round;transform-box:fill-box;transform-origin:center}.kd-dashed{stroke-dasharray:5 6}.kd-element.kd-fill{fill:var(--tint)}.kd-accent{stroke:var(--accent)}.kd-warm{stroke:var(--kd-warm)}.kd-danger{stroke:var(--error)}.kd-muted{stroke:var(--line2)}.kd-ink{stroke:var(--ink)}.kd-warm.kd-fill{fill:var(--kd-warm-bg)}.kd-danger.kd-fill{fill:var(--kd-danger-bg)}.kd-muted.kd-fill{fill:var(--kd-muted-bg)}.kd-ink.kd-fill{fill:var(--wash)}.knowledge-svg text.kd-accent{fill:var(--accent)}.knowledge-svg text.kd-warm{fill:var(--kd-warm)}.knowledge-svg text.kd-danger{fill:var(--error)}.knowledge-svg text.kd-muted{fill:var(--muted)}.knowledge-svg text.kd-ink{fill:var(--ink)}.kd-marker{stroke:none;fill:var(--accent)}.kd-marker.kd-warm{fill:var(--kd-warm)}.kd-marker.kd-danger{fill:var(--error)}.kd-marker.kd-muted{fill:var(--muted)}.kd-marker.kd-ink{fill:var(--ink)}.kd-element.kd-dim{opacity:.22}.kd-element.kd-selected:not(text){stroke-width:2.2}.kd-motion-overlay{pointer-events:none}.kd-moving-line,.kd-outline-trace{stroke-width:2.8;fill:none;stroke-linecap:round;stroke-linejoin:round;vector-effect:non-scaling-stroke;opacity:0}.kd-flow-token{fill:var(--accent);stroke:var(--card);stroke-width:2;opacity:0;vector-effect:non-scaling-stroke}.kd-flow-token.kd-warm{fill:var(--kd-warm)}.kd-flow-token.kd-danger{fill:var(--error)}.kd-flow-token.kd-muted{fill:var(--muted)}.kd-scan-probe{stroke:var(--accent);stroke-width:2;fill:none;opacity:0;vector-effect:non-scaling-stroke}.diagram-motion-bar{display:flex;align-items:center;gap:16px;padding:16px 24px;background:var(--paper);font-size:12px;line-height:16px;min-height:64px}.motion-badge{display:flex;gap:8px;align-items:center;white-space:nowrap;color:var(--muted)}.motion-badge i{width:6px;height:6px;border-radius:50%;background:var(--accent)}.motion-phase{flex:1;min-width:0;font-size:14px;line-height:20px;color:var(--accent);font-weight:500;font-variant-numeric:tabular-nums}.motion-actions{display:flex;gap:8px;align-items:center}.motion-actions button{min-height:32px;padding:4px 8px;border-radius:8px;font-size:12px;line-height:16px;font-weight:500;white-space:nowrap}.motion-actions .icon{width:16px;height:16px}.motion-steps{display:flex;height:2px;gap:4px;background:var(--paper)}.motion-steps i{flex:1;background:var(--line);transition:background .3s var(--ease)}.motion-steps i.active{background:var(--accent)}.diagram-focus{display:flex;flex-wrap:wrap;gap:8px;padding:24px 24px 16px}.diagram-focus-button{font-size:12px;line-height:16px;padding:8px 12px;min-height:32px;border-radius:9999px;font-weight:500;background:transparent}.diagram-focus-button.active{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}.diagram-insight{display:flex;align-items:baseline;gap:16px;padding:16px 24px 24px;min-height:96px;font-size:14px;line-height:24px;color:var(--muted)}.diagram-insight-label{white-space:nowrap;color:var(--accent);font-size:12px;line-height:20px;font-weight:600;flex:none}.diagram-footnote{margin:0;padding:16px 24px;font-size:12px;line-height:20px;color:var(--muted);background:var(--paper)}.diagram-dialog{width:min(1184px,calc(100% - 32px));max-height:92vh;padding:24px;background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:24px}.diagram-dialog-head{display:flex;justify-content:space-between;gap:24px;align-items:flex-start;margin-bottom:16px}.diagram-dialog-head h3{font-size:24px;line-height:32px}.diagram-close{width:40px;min-height:40px;padding:8px;flex:none}.diagram-pan-hint{font-size:12px;line-height:20px;color:var(--muted);margin-bottom:16px}.diagram-full-canvas{overflow:auto;overscroll-behavior:contain;border:1px solid var(--line);border-radius:16px;background:var(--card)}.diagram-full-canvas .knowledge-svg{min-width:720px}.diagram-dialog-summary{font-size:14px;line-height:24px;margin-top:16px;color:var(--muted)}.diagram-dialog .kd-motion-overlay{display:none}.diagram-dialog .kd-element{opacity:1!important;transform:none!important;filter:none!important}.diagram-dialog::backdrop{background:#17213a80;backdrop-filter:blur(8px)}
@media(max-width:900px){.diagram-caption{padding:24px 24px 16px}.diagram-motion-bar{flex-wrap:wrap;gap:12px}.motion-badge{display:none}.motion-phase{font-size:12px;line-height:20px}.diagram-caption h3{font-size:18px;line-height:28px}}
@media(max-width:720px){.knowledge-figure{border-radius:16px}.diagram-caption{padding:24px 16px 16px;gap:12px}.diagram-caption h3{font-size:18px;line-height:28px}.diagram-kicker{font-size:12px;line-height:16px;margin-bottom:8px}.diagram-kicker span{display:none}.diagram-zoom{padding:8px;min-height:40px}.diagram-zoom span{display:none}.diagram-canvas{margin:0 8px;padding:0 0 16px;border-radius:8px}.diagram-motion-bar{padding:12px 16px;gap:8px;flex-wrap:nowrap;align-items:center;min-height:64px}.motion-phase{font-size:12px;line-height:20px}.motion-actions{gap:4px}.motion-actions button{padding:8px;min-height:32px}.motion-replay span{display:none}.diagram-focus{padding:16px 16px 12px;gap:8px}.diagram-focus-button{font-size:12px;padding:8px 12px}.diagram-insight{display:block;padding:12px 16px 24px;font-size:14px;line-height:24px;min-height:144px}.diagram-insight-label{display:block;margin-bottom:8px}.diagram-footnote{padding:16px;font-size:12px;line-height:20px}.diagram-dialog{padding:16px;border-radius:16px}.diagram-dialog-head h3{font-size:20px;line-height:28px}.diagram-dialog-summary{font-size:14px;line-height:24px}}
@media(prefers-reduced-motion:reduce){.kd-element{transition:none!important}.kd-motion-overlay{display:none}.motion-badge i{background:var(--muted)}}
@media print{.diagram-motion-bar,.motion-steps,.diagram-focus,.diagram-zoom,.diagram-dialog{display:none!important}.knowledge-figure{break-inside:avoid;background:white;box-shadow:none}.knowledge-svg{max-height:96mm}.kd-element{opacity:1!important;transform:none!important;filter:none!important}.kd-motion-overlay{display:none!important}.diagram-insight{min-height:0}.diagram-footnote{font-size:12px}}