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.sum-cell.mixed{border-color:var(--secondary);background:repeating-linear-gradient(135deg,var(--secondary-soft),var(--secondary-soft) 5px,transparent 5px,transparent 10px),var(--bg)}.prob-v2-lesson .sum-cell.mixed .fiber i:first-child{background:var(--event)}.prob-v2-lesson .sum-status{color:var(--text-muted);font-size:9px}.prob-v2-lesson .sum-cell.yes .sum-status{color:var(--event)}.prob-v2-lesson .sum-cell.mixed .sum-status{color:var(--secondary)}.prob-v2-lesson .model-verdict{margin:14px 0 0;padding:13px 15px;border-radius:11px;background:var(--accent-10);color:var(--text-secondary);font-size:13px;line-height:1.7}.prob-v2-lesson .model-verdict strong{color:var(--text)}.prob-v2-lesson .compression-visual{display:flex;align-items:center;justify-content:center;gap:14px}.prob-v2-lesson .compression-visual .grid-icon{display:grid;grid-template-columns:repeat(3,13px);gap:3px}.prob-v2-lesson .compression-visual .grid-icon i{width:13px;height:13px;border:1px solid var(--world);border-radius:3px;background:var(--world-soft)}.prob-v2-lesson .compression-visual .sum-icon{display:flex;gap:3px}.prob-v2-lesson .compression-visual .sum-icon i{width:9px;height:25px;border-radius:3px;background:var(--world-soft)}.prob-v2-lesson .compression-visual b{color:var(--accent);font-size:20px}@media(prefers-reduced-motion:reduce){.prob-v2-lesson button,.prob-v2-lesson .outcome-tile,.prob-v2-lesson .tree-lines line{transition:none!important}}.prob-v2-ch3{--mass: #b77d69;--mass-soft: color-mix(in srgb, var(--mass) 16%, transparent);--blue-mass: #6f92ad;--blue-soft: color-mix(in srgb, var(--blue-mass) 16%, transparent);--valid: #758f69;--valid-soft: color-mix(in srgb, var(--valid) 16%, transparent);--invalid: #a85f5f;--invalid-soft: color-mix(in srgb, var(--invalid) 14%, transparent)}.prob-v2-ch3 .weight-question{display:grid;grid-template-columns:minmax(430px,1.1fr) minmax(320px,.9fr);gap:24px;align-items:center}.prob-v2-ch3 .bag-visual{display:grid;grid-template-columns:1fr 220px;gap:18px;align-items:center}.prob-v2-ch3 .bag{position:relative;display:grid;grid-template-columns:repeat(5,1fr);gap:8px;min-height:190px;padding:26px 28px 38px;border:2px solid var(--border-strong);border-top:0;border-radius:16px 16px 48px 48px;background:var(--bg)}.prob-v2-ch3 .bag:before{content:"";position:absolute;top:-7px;left:8%;right:8%;height:13px;border:2px solid var(--border-strong);border-radius:50%;background:var(--bg-surface)}.prob-v2-ch3 .ball{display:grid;place-items:center;aspect-ratio:1;min-width:0;border:1px solid color-mix(in srgb,var(--mass) 65%,var(--bg));border-radius:50%;background:var(--mass);color:var(--bg);font-size:9px;font-weight:800}.prob-v2-ch3 .ball.blue{border-color:color-mix(in srgb,var(--blue-mass) 65%,var(--bg));background:var(--blue-mass)}.prob-v2-ch3 .bag-controls{display:grid;gap:14px}.prob-v2-ch3 .count-control{display:grid;grid-template-columns:54px 1fr 30px;gap:9px;align-items:center}.prob-v2-ch3 .count-control label{color:var(--text-secondary);font-size:12px;font-weight:700}.prob-v2-ch3 .count-control input{width:100%;accent-color:var(--accent)}.prob-v2-ch3 .count-control strong{color:var(--text);font-family:JetBrains Mono,monospace;text-align:right}.prob-v2-ch3 .category-compression{display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:center}.prob-v2-ch3 .category-card{padding:18px;border:1px solid var(--border);border-radius:14px;background:var(--bg-surface)}.prob-v2-ch3 .category-card>span{display:block;margin-bottom:8px;color:var(--text-muted);font-size:9px;font-weight:750;letter-spacing:.08em;text-transform:uppercase}.prob-v2-ch3 .category-card strong{color:var(--text);font-size:21px}.prob-v2-ch3 .category-card p{margin:8px 0 0;color:var(--text-secondary);font-size:12px;line-height:1.65}.prob-v2-ch3 .compression-arrow{color:var(--accent);font-size:24px}.prob-v2-ch3 .mass-bar{display:flex;height:54px;overflow:hidden;border:1px solid var(--border-strong);border-radius:12px;background:var(--bg)}.prob-v2-ch3 .mass-segment{display:grid;place-items:center;min-width:0;background:var(--mass);color:var(--bg);font-size:11px;font-weight:800;transition:width .2s ease}.prob-v2-ch3 .mass-segment.blue{background:var(--blue-mass)}.prob-v2-ch3 .normalization-board{display:grid;grid-template-columns:minmax(600px,1.25fr) minmax(280px,.75fr);gap:22px;align-items:stretch}.prob-v2-ch3 .weight-editor{padding:18px;border:1px solid var(--border);border-radius:17px;background:var(--bg-surface)}.prob-v2-ch3 .weight-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:9px;align-items:end;height:280px;margin-top:16px}.prob-v2-ch3 .weight-column{display:grid;grid-template-rows:1fr auto auto auto;gap:7px;align-items:end;height:100%;text-align:center}.prob-v2-ch3 .bar-track{display:flex;align-items:end;justify-content:center;height:100%;padding:0 8px;border-bottom:1px solid var(--border-strong)}.prob-v2-ch3 .weight-fill{width:100%;min-height:4px;border-radius:8px 8px 0 0;background:var(--mass);transition:height .2s ease}.prob-v2-ch3 .weight-column input{width:100%;accent-color:var(--mass)}.prob-v2-ch3 .weight-column strong{color:var(--text);font-size:12px}.prob-v2-ch3 .weight-column span{color:var(--text-muted);font-family:JetBrains Mono,monospace;font-size:9px}.prob-v2-ch3 .normalization-side{display:grid;gap:12px}.prob-v2-ch3 .total-card{padding:18px;border:1px solid var(--border);border-radius:15px;background:var(--bg-surface)}.prob-v2-ch3 .total-card span{display:block;color:var(--text-muted);font-size:9px;font-weight:750;letter-spacing:.08em;text-transform:uppercase}.prob-v2-ch3 .total-card strong{display:block;margin-top:5px;color:var(--text);font-size:28px}.prob-v2-ch3 .total-card p{margin:7px 0 0;color:var(--text-secondary);font-size:11px;line-height:1.6}.prob-v2-ch3 .normalization-flow{display:grid;grid-template-columns:1fr auto 1fr;gap:10px;align-items:center;padding:14px;border:1px solid var(--accent-30);border-radius:14px;background:var(--accent-10)}.prob-v2-ch3 .normalization-flow div{text-align:center}.prob-v2-ch3 .normalization-flow span{display:block;color:var(--text-muted);font-size:9px}.prob-v2-ch3 .normalization-flow strong{color:var(--text);font-family:JetBrains Mono,monospace;font-size:16px}.prob-v2-ch3 .normalization-flow i{color:var(--accent);font-style:normal}.prob-v2-ch3 .distribution-strip{display:flex;height:78px;overflow:hidden;border:1px solid var(--border-strong);border-radius:14px;background:var(--bg)}.prob-v2-ch3 .distribution-strip div{display:grid;place-items:center;min-width:0;border-right:1px solid color-mix(in srgb,var(--bg) 45%,transparent);background:var(--mass);color:var(--bg);font-size:10px;font-weight:750;transition:width .2s ease}.prob-v2-ch3 .shortcut-demo{display:grid;grid-template-columns:1fr 1fr;gap:18px}.prob-v2-ch3 .die-model{padding:19px;border:1px solid var(--border);border-radius:17px;background:var(--bg-surface)}.prob-v2-ch3 .die-model h3{font-size:16px}.prob-v2-ch3 .die-model>p{color:var(--text-muted);font-size:11px}.prob-v2-ch3 .weighted-outcomes{display:grid;grid-template-columns:repeat(6,1fr);gap:7px;align-items:end;height:210px;margin-top:14px}.prob-v2-ch3 .weighted-outcome{display:grid;grid-template-rows:1fr auto auto;gap:7px;align-items:end;height:100%;text-align:center}.prob-v2-ch3 .weight-pillar-wrap{display:flex;align-items:end;justify-content:center;height:100%}.prob-v2-ch3 .weight-pillar{width:72%;min-height:3px;border-radius:7px 7px 0 0;background:var(--blue-mass)}.prob-v2-ch3 .weighted-outcome.in-event .weight-pillar{background:var(--mass)}.prob-v2-ch3 .weighted-outcome strong{display:grid;place-items:center;width:32px;height:32px;margin:auto;border:1px solid var(--border-strong);border-radius:9px;color:var(--text);font-size:12px}.prob-v2-ch3 .weighted-outcome.in-event strong{border-color:var(--mass);background:var(--mass-soft);color:var(--mass)}.prob-v2-ch3 .weighted-outcome span{color:var(--text-muted);font-family:JetBrains Mono,monospace;font-size:9px}.prob-v2-ch3 .model-result{display:grid;grid-template-columns:1fr auto 1fr;gap:10px;align-items:center;margin-top:15px;padding:13px;border-radius:11px;background:var(--bg)}.prob-v2-ch3 .model-result div{text-align:center}.prob-v2-ch3 .model-result span{display:block;color:var(--text-muted);font-size:9px}.prob-v2-ch3 .model-result strong{color:var(--text);font-size:16px}.prob-v2-ch3 .model-result i{color:var(--accent);font-style:normal}.prob-v2-ch3 .shortcut-verdict{margin-top:14px;padding:14px;border-left:3px solid;border-radius:0 10px 10px 0;font-size:12px;line-height:1.65}.prob-v2-ch3 .shortcut-verdict.valid{border-color:var(--valid);background:var(--valid-soft);color:var(--text-secondary)}.prob-v2-ch3 .shortcut-verdict.invalid{border-color:var(--invalid);background:var(--invalid-soft);color:var(--text-secondary)}.prob-v2-ch3 .foundation-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.prob-v2-ch3 .foundation-card{padding:18px;border:1px solid var(--border);border-radius:15px;background:var(--bg-surface)}.prob-v2-ch3 .foundation-card .foundation-number{display:grid;place-items:center;width:28px;height:28px;margin-bottom:12px;border-radius:50%;background:var(--accent-18);color:var(--accent);font-size:11px;font-weight:800}.prob-v2-ch3 .foundation-card strong{color:var(--text);font-size:14px}.prob-v2-ch3 .foundation-card p{margin:7px 0 0;color:var(--text-secondary);font-size:12px;line-height:1.65}.prob-v2-ch3 .model-tester{display:grid;grid-template-columns:minmax(520px,1.15fr) minmax(300px,.85fr);gap:22px;align-items:center}.prob-v2-ch3 .test-model{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.prob-v2-ch3 .test-weight{padding:14px 8px;border:1px solid var(--border);border-radius:12px;background:var(--bg);text-align:center}.prob-v2-ch3 .test-weight span{display:block;color:var(--text-muted);font-size:9px}.prob-v2-ch3 .test-weight strong{color:var(--text);font-family:JetBrains Mono,monospace;font-size:17px}.prob-v2-ch3 .test-weight.negative{border-color:var(--invalid);background:var(--invalid-soft)}.prob-v2-ch3 .validity-panel{padding:18px;border:1px solid;border-radius:15px}.prob-v2-ch3 .validity-panel.valid{border-color:var(--valid);background:var(--valid-soft)}.prob-v2-ch3 .validity-panel.invalid{border-color:var(--invalid);background:var(--invalid-soft)}.prob-v2-ch3 .validity-panel span{display:block;color:var(--text-muted);font-size:9px;font-weight:750;letter-spacing:.08em}.prob-v2-ch3 .validity-panel strong{display:block;margin:5px 0;color:var(--text);font-size:20px}.prob-v2-ch3 .validity-panel p{margin:0;color:var(--text-secondary);font-size:12px;line-height:1.65}.prob-v2-ch3 .additivity-demo{display:grid;grid-template-columns:minmax(560px,1.2fr) minmax(300px,.8fr);gap:22px;align-items:center}.prob-v2-ch3 .weight-tiles{display:grid;grid-template-columns:repeat(6,1fr);gap:8px}.prob-v2-ch3 .weight-tiles button{display:grid;gap:7px;place-items:center;min-height:90px;border:1px solid var(--border);border-radius:13px;background:var(--bg);color:var(--text-secondary);cursor:pointer}.prob-v2-ch3 .weight-tiles button.selected{border-color:var(--mass);background:var(--mass-soft);color:var(--mass)}.prob-v2-ch3 .weight-tiles button strong{font-size:18px}.prob-v2-ch3 .weight-tiles button span{font-family:JetBrains Mono,monospace;font-size:9px}.prob-v2-ch3 .event-scale{padding:18px;border:1px solid var(--border);border-radius:15px;background:var(--bg-surface)}.prob-v2-ch3 .event-scale span{display:block;color:var(--text-muted);font-size:9px}.prob-v2-ch3 .event-scale strong{display:block;margin:7px 0 12px;color:var(--mass);font-size:28px}.prob-v2-ch3 .scale-track{height:14px;overflow:hidden;border-radius:999px;background:var(--bg-elevated)}.prob-v2-ch3 .scale-fill{height:100%;border-radius:inherit;background:var(--mass);transition:width .2s ease}@media(prefers-reduced-motion:reduce){.prob-v2-ch3 .mass-segment,.prob-v2-ch3 .weight-fill,.prob-v2-ch3 .distribution-strip div,.prob-v2-ch3 .scale-fill{transition:none!important}}.prob-v2-ch4{--set-a: #b77d69;--set-a-soft: color-mix(in srgb, var(--set-a) 17%, transparent);--set-b: #6f92ad;--set-b-soft: color-mix(in srgb, var(--set-b) 17%, transparent);--overlap: #8b7aa6;--overlap-soft: color-mix(in srgb, var(--overlap) 19%, transparent);--outside: #8a847c;--success: #758f69;--success-soft: color-mix(in srgb, var(--success) 16%, transparent);--danger: #a85f5f;--danger-soft: color-mix(in srgb, var(--danger) 14%, transparent)}.prob-v2-ch4 .set-legend{display:flex;gap:16px;align-items:center;color:var(--text-secondary);font-size:11px}.prob-v2-ch4 .set-legend span{display:flex;gap:6px;align-items:center}.prob-v2-ch4 .set-legend i{width:11px;height:11px;border-radius:3px;background:var(--set-a)}.prob-v2-ch4 .set-legend .b{background:var(--set-b)}.prob-v2-ch4 .set-legend .both{background:var(--overlap)}.prob-v2-ch4 .universe-board{padding:18px;border:1px solid var(--border);border-radius:18px;background:var(--bg-surface)}.prob-v2-ch4 .universe-label{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;color:var(--text-muted);font-size:10px;font-weight:750;letter-spacing:.08em;text-transform:uppercase}.prob-v2-ch4 .outcome-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:7px}.prob-v2-ch4 .outcome-cell{position:relative;display:grid;place-items:center;min-height:76px;overflow:hidden;border:1px solid var(--border);border-radius:12px;background:var(--bg);color:var(--text-muted);transition:border-color .18s ease,background .18s ease,opacity .18s ease,transform .18s ease}.prob-v2-ch4 .outcome-cell strong{position:relative;z-index:2;font-size:17px}.prob-v2-ch4 .outcome-cell .membership{position:absolute;right:5px;bottom:5px;left:5px;display:flex;justify-content:center;gap:3px}.prob-v2-ch4 .membership i{width:16px;height:4px;border-radius:99px;background:var(--set-a)}.prob-v2-ch4 .membership i.b{background:var(--set-b)}.prob-v2-ch4 .outcome-cell.in-a{border-color:color-mix(in srgb,var(--set-a) 60%,var(--border))}.prob-v2-ch4 .outcome-cell.in-b{border-color:color-mix(in srgb,var(--set-b) 60%,var(--border))}.prob-v2-ch4 .outcome-cell.in-a.in-b{border-color:var(--overlap)}.prob-v2-ch4 .outcome-cell.selected{border-color:var(--overlap);background:var(--overlap-soft);color:var(--text);transform:translateY(-3px)}.prob-v2-ch4 .outcome-cell.dimmed{opacity:.32}.prob-v2-ch4 .selection-readout{display:grid;grid-template-columns:minmax(280px,.75fr) minmax(460px,1.25fr);gap:14px;align-items:center;margin-top:14px}.prob-v2-ch4 .logic-token{padding:15px 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.prediction-board{display:grid;grid-template-columns:minmax(500px,1fr) auto;gap:24px;align-items:center}.prob-v2-ch4 .receipt{display:grid;grid-template-columns:1fr 70px 1fr;gap:12px;align-items:stretch}.prob-v2-ch4 .receipt-column{padding:17px;border:1px solid var(--border);border-radius:16px;background:var(--bg-surface)}.prob-v2-ch4 .receipt-column>span{display:block;margin-bottom:10px;color:var(--text-muted);font-size:9px;font-weight:750;letter-spacing:.08em;text-transform:uppercase}.prob-v2-ch4 .receipt-items{display:grid;grid-template-columns:repeat(6,1fr);gap:5px}.prob-v2-ch4 .receipt-item{position:relative;display:grid;place-items:center;min-height:66px;border:1px solid var(--border);border-radius:10px;background:var(--bg);color:var(--text);font-size:13px;font-weight:750}.prob-v2-ch4 .receipt-item.duplicate{border-color:var(--danger);background:var(--danger-soft)}.prob-v2-ch4 .receipt-item small{position:absolute;right:3px;bottom:3px;left:3px;color:var(--danger);font-size:7px;text-align:center;text-transform:uppercase}.prob-v2-ch4 .receipt-plus{display:grid;place-items:center;color:var(--accent);font-size:25px}.prob-v2-ch4 .counting-summary{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:10px;align-items:center;padding:18px;border:1px solid var(--border);border-radius:16px;background:var(--bg-surface)}.prob-v2-ch4 .counting-summary>div{text-align:center}.prob-v2-ch4 .counting-summary span{display:block;color:var(--text-muted);font-size:9px}.prob-v2-ch4 .counting-summary strong{display:block;margin-top:4px;color:var(--text);font-size:20px}.prob-v2-ch4 .counting-summary i{color:var(--accent);font-size:20px;font-style:normal}.prob-v2-ch4 .counting-summary .subtract strong{color:var(--danger)}.prob-v2-ch4 .union-strip{display:flex;height:64px;overflow:hidden;border:1px solid var(--border-strong);border-radius:13px}.prob-v2-ch4 .union-strip 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var(--border);border-radius:16px;background:var(--bg-surface)}.prob-v2-ch4 .mirror-panel h3{font-size:15px}.prob-v2-ch4 .mini-world{display:grid;grid-template-columns:repeat(6,1fr);gap:6px;margin-top:13px}.prob-v2-ch4 .mini-world div{display:grid;place-items:center;min-height:46px;border:1px solid var(--border);border-radius:9px;background:var(--bg);color:var(--text-muted);font-size:11px;font-weight:750}.prob-v2-ch4 .mini-world div.selected{border-color:var(--overlap);background:var(--overlap-soft);color:var(--text)}.prob-v2-ch4 .mirror-equals{display:grid;place-items:center;width:44px;height:44px;border-radius:50%;background:var(--success-soft);color:var(--success);font-size:22px;font-weight:800}.prob-v2-ch4 .logic-translation{display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:center;padding:18px;border:1px solid var(--accent-30);border-radius:16px;background:var(--accent-10)}.prob-v2-ch4 .logic-translation div{text-align:center}.prob-v2-ch4 .logic-translation 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.event-tray{display:grid;align-content:center;padding:20px;border:1px solid var(--path);border-radius:17px;background:var(--path-soft)}.prob-v2-ch5 .event-tray>span{color:var(--text-muted);font-size:9px;font-weight:750;letter-spacing:.08em;text-transform:uppercase}.prob-v2-ch5 .event-tray>strong{margin:6px 0 15px;color:var(--text);font-size:26px}.prob-v2-ch5 .tray-pieces{display:flex;height:64px;overflow:hidden;border-radius:12px;background:var(--bg)}.prob-v2-ch5 .tray-pieces div{display:grid;place-items:center;min-width:0;background:var(--path);color:var(--bg);font-size:10px;font-weight:750}.prob-v2-ch5 .tray-pieces div.tray-rest{flex:1;background:var(--bg);color:var(--text-muted)}.prob-v2-ch5 .event-tray p{margin:13px 0 0;color:var(--text-secondary);font-size:12px;line-height:1.65}.prob-v2-ch5 .operation-map{display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:center;padding:18px;border:1px solid var(--accent-30);border-radius:16px;background:var(--accent-10)}.prob-v2-ch5 .operation-map div{text-align:center}.prob-v2-ch5 .operation-map span{display:block;color:var(--text-muted);font-size:9px}.prob-v2-ch5 .operation-map strong{display:block;margin-top:4px;color:var(--text);font-size:16px}.prob-v2-ch5 .operation-map i{color:var(--accent);font-style:normal}@media(prefers-reduced-motion:reduce){.prob-v2-ch5 .tree-edge,.prob-v2-ch5 .tree-node,.prob-v2-ch5 .tree-label,.prob-v2-ch5 .first-world,.prob-v2-ch5 .second-world,.prob-v2-ch5 .leaf-bar-fill{transition:none!important}}.prob-v2-ch6{--count-a: #b77d69;--count-a-soft: color-mix(in srgb, var(--count-a) 17%, transparent);--count-b: #6f92ad;--count-b-soft: color-mix(in srgb, var(--count-b) 17%, transparent);--count-c: #8b9c72;--count-c-soft: color-mix(in srgb, var(--count-c) 17%, transparent);--cluster: #8b7aa6;--cluster-soft: color-mix(in srgb, var(--cluster) 18%, transparent);--success: #758f69;--success-soft: color-mix(in srgb, 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.tree-layer{display:grid;place-items:center;min-height:116px;padding:14px;border:1px solid var(--border);border-radius:14px;background:var(--bg);text-align:center}.prob-v2-ch6 .tree-layer.a{border-color:var(--count-a);background:var(--count-a-soft)}.prob-v2-ch6 .tree-layer.b{border-color:var(--count-b);background:var(--count-b-soft)}.prob-v2-ch6 .tree-layer.c{border-color:var(--count-c);background:var(--count-c-soft)}.prob-v2-ch6 .tree-layer span{color:var(--text-muted);font-size:9px}.prob-v2-ch6 .tree-layer strong{display:block;margin:5px 0;color:var(--text);font-size:25px}.prob-v2-ch6 .tree-layer small{color:var(--text-secondary);font-size:9px}.prob-v2-ch6 .layer-times{color:var(--accent);font-size:22px}.prob-v2-ch6 .leaf-total{display:grid;place-items:center;min-height:116px;padding:14px;border:1px solid var(--cluster);border-radius:14px;background:var(--cluster-soft);text-align:center}.prob-v2-ch6 .leaf-total span{color:var(--text-muted);font-size:9px}.prob-v2-ch6 .leaf-total 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input{width:100%;accent-color:var(--accent)}.prob-v2-ch6 .range-control strong{color:var(--text);font-family:JetBrains Mono,monospace;text-align:right}.prob-v2-ch6 .slot-board{display:grid;grid-template-columns:minmax(620px,1.25fr) minmax(300px,.75fr);gap:20px;align-items:stretch}.prob-v2-ch6 .ordered-slots{display:grid;align-content:center;padding:18px;border:1px solid var(--border);border-radius:17px;background:var(--bg-surface)}.prob-v2-ch6 .slot-row{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;min-height:176px}.prob-v2-ch6 .role-slot{display:grid;align-content:center;min-width:0;padding:14px;border:1px solid var(--border);border-radius:14px;background:var(--bg);text-align:center}.prob-v2-ch6 .role-slot.inactive{opacity:.2}.prob-v2-ch6 .role-slot span{color:var(--text-muted);font-size:9px}.prob-v2-ch6 .role-slot strong{display:block;margin:6px 0;color:var(--text);font-size:26px}.prob-v2-ch6 .role-slot small{color:var(--text-secondary);font-size:10px}.prob-v2-ch6 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.arrangement-samples{display:flex;flex-wrap:wrap;gap:6px}.prob-v2-ch6 .arrangement-samples span{padding:7px 10px;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--text-secondary);font-family:JetBrains Mono,monospace;font-size:9px}.prob-v2-ch6 .committee-layout{display:grid;grid-template-columns:minmax(520px,1fr) minmax(410px,.9fr);gap:20px;align-items:stretch}.prob-v2-ch6 .committee-list{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}.prob-v2-ch6 .committee-list button{min-height:72px;border:1px solid var(--border);border-radius:12px;background:var(--bg);color:var(--text-secondary);cursor:pointer;font-family:JetBrains Mono,monospace;font-size:12px}.prob-v2-ch6 .committee-list button.active{border-color:var(--cluster);background:var(--cluster-soft);color:var(--text)}.prob-v2-ch6 .order-cluster{padding:18px;border:1px solid var(--cluster);border-radius:17px;background:var(--cluster-soft)}.prob-v2-ch6 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.chart-area{fill:var(--cluster-soft)}.prob-v2-ch6 .chart-marker{fill:var(--bg);stroke:var(--cluster);stroke-width:4}.prob-v2-ch6 .chart-text{fill:var(--text-muted);font-size:10px}.prob-v2-ch6 .birthday-stats{display:grid;gap:10px}.prob-v2-ch6 .birthday-stat{padding:17px;border:1px solid var(--border);border-radius:14px;background:var(--bg-surface)}.prob-v2-ch6 .birthday-stat span{display:block;color:var(--text-muted);font-size:9px;letter-spacing:.07em;text-transform:uppercase}.prob-v2-ch6 .birthday-stat strong{display:block;margin:5px 0;color:var(--text);font-size:25px}.prob-v2-ch6 .birthday-stat p{margin:0;color:var(--text-secondary);font-size:11px;line-height:1.6}.prob-v2-ch6 .birthday-stat.highlight{border-color:var(--cluster);background:var(--cluster-soft)}.prob-v2-ch6 .people-control{display:grid;grid-template-columns:auto 1fr 80px;gap:14px;align-items:center;padding:15px 18px;border:1px solid var(--border);border-radius:14px;background:var(--bg-surface)}.prob-v2-ch6 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transparent)}.prob-v2-ch7 .range-lab{display:grid;grid-template-columns:minmax(500px,1fr) minmax(400px,.85fr);gap:18px;align-items:stretch}.prob-v2-ch7 .threshold-controls{display:grid;gap:10px;padding:18px;border:1px solid var(--border);border-radius:17px;background:var(--bg-surface)}.prob-v2-ch7 .threshold-control{display:grid;grid-template-columns:130px 1fr 42px;gap:12px;align-items:center}.prob-v2-ch7 .threshold-control label{color:var(--text-secondary);font-size:12px;font-weight:700}.prob-v2-ch7 .threshold-control input{width:100%;accent-color:var(--count)}.prob-v2-ch7 .threshold-control strong{color:var(--text);font-family:JetBrains Mono,monospace;text-align:right}.prob-v2-ch7 .language-card{display:grid;align-content:center;padding:20px;border:1px solid var(--count);border-radius:17px;background:var(--count-soft)}.prob-v2-ch7 .language-card span{color:var(--text-muted);font-size:9px;letter-spacing:.07em;text-transform:uppercase}.prob-v2-ch7 .language-card 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.strategy-option h3{margin-top:7px}.prob-v2-ch7 .category-row{display:flex;gap:6px;min-height:50px;margin:13px 0}.prob-v2-ch7 .category-row i{display:grid;place-items:center;min-width:44px;padding:8px;border:1px solid var(--border);border-radius:9px;background:var(--bg);color:var(--text-secondary);font-style:normal;font-size:10px}.prob-v2-ch7 .cost-meter{height:9px;overflow:hidden;border-radius:99px;background:var(--bg)}.prob-v2-ch7 .cost-meter div{height:100%;border-radius:inherit;background:var(--count)}.prob-v2-ch7 .strategy-option p{margin:11px 0 0;color:var(--text-secondary);font-size:12px;line-height:1.65}.prob-v2-ch7 .strategy-feedback{padding:18px;border-left:3px solid var(--accent);border-radius:0 13px 13px 0;background:var(--accent-10);color:var(--text-secondary);font-size:13px;line-height:1.7}@media(prefers-reduced-motion:reduce){.prob-v2-ch7 .count-tile,.prob-v2-ch7 .success-mass,.prob-v2-ch7 .failure-mass,.prob-v2-ch7 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.person-tile.in-intersection{border-color:var(--overlap);background:var(--overlap-soft);color:var(--text)}.prob-v2-ch8 .person-tile.outside-condition{opacity:.2}.prob-v2-ch8 .population-legend{display:flex;gap:16px;margin-top:13px;color:var(--text-secondary);font-size:10px}.prob-v2-ch8 .population-legend i{display:inline-block;width:11px;height:11px;margin-right:5px;border:1px solid var(--condition);border-radius:3px;vertical-align:-1px}.prob-v2-ch8 .population-legend i.overlap{border-color:var(--overlap);background:var(--overlap-soft)}.prob-v2-ch8 .zoom-panel{display:grid;align-content:center;border-color:var(--condition);background:var(--condition-soft)}.prob-v2-ch8 .given-expression{display:grid;grid-template-columns:1fr auto 1fr;gap:10px;align-items:center;margin:14px 0}.prob-v2-ch8 .given-expression div{padding:15px 10px;border:1px solid var(--border);border-radius:11px;background:var(--bg);text-align:center}.prob-v2-ch8 .given-expression span{display:block;color:var(--text-muted);font-size:8px}.prob-v2-ch8 .given-expression strong{display:block;margin-top:5px;color:var(--text);font-size:19px}.prob-v2-ch8 .given-expression i{color:var(--condition);font-style:normal}.prob-v2-ch8 .direction-result{color:var(--text);font-size:32px;font-weight:780}.prob-v2-ch8 .nested-controls{display:grid;grid-template-columns:1fr 1fr;gap:12px}.prob-v2-ch8 .nested-control{display:grid;grid-template-columns:160px 1fr 62px;gap:12px;align-items:center;padding:15px;border:1px solid var(--border);border-radius:13px;background:var(--bg)}.prob-v2-ch8 .nested-control label{color:var(--text-secondary);font-size:11px;font-weight:700}.prob-v2-ch8 .nested-control input{width:100%;accent-color:var(--condition)}.prob-v2-ch8 .nested-control strong{color:var(--text);font-family:JetBrains Mono,monospace;text-align:right}.prob-v2-ch8 .nested-board{display:grid;grid-template-columns:minmax(650px,1.25fr) minmax(310px,.75fr);gap:18px;align-items:stretch}.prob-v2-ch8 .nested-canvas{position:relative;min-height:350px;overflow:hidden;border:1px solid var(--border-strong);border-radius:18px;background:linear-gradient(var(--border) 1px,transparent 1px),linear-gradient(90deg,var(--border) 1px,transparent 1px),var(--bg-surface);background-size:10% 10%}.prob-v2-ch8 .whole-label{position:absolute;top:15px;right:17px;color:var(--text-muted);font-size:9px}.prob-v2-ch8 .condition-area{position:absolute;inset:0 auto 0 0;overflow:hidden;border-right:3px solid var(--condition);background:var(--condition-soft);transition:width .2s ease}.prob-v2-ch8 .condition-area>span{position:absolute;top:15px;left:17px;color:var(--condition);font-size:10px;font-weight:750;white-space:nowrap}.prob-v2-ch8 .intersection-area{position:absolute;inset:auto 0 0;display:grid;place-items:center;border-top:3px solid var(--overlap);background:var(--overlap);color:var(--bg);transition:height .2s ease}.prob-v2-ch8 .intersection-area strong{font-size:24px}.prob-v2-ch8 .intersection-area span{font-size:9px}.prob-v2-ch8 .nested-readout{display:grid;gap:10px}.prob-v2-ch8 .nested-stat{padding:17px;border:1px solid var(--border);border-radius:14px;background:var(--bg-surface)}.prob-v2-ch8 .nested-stat span{display:block;color:var(--text-muted);font-size:9px}.prob-v2-ch8 .nested-stat strong{display:block;margin:6px 0;color:var(--text);font-size:26px}.prob-v2-ch8 .nested-stat p{margin:0;color:var(--text-secondary);font-size:11px;line-height:1.55}.prob-v2-ch8 .nested-stat.highlight{border-color:var(--overlap);background:var(--overlap-soft)}.prob-v2-ch8 .information-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.prob-v2-ch8 .information-tabs button{padding:15px;border:1px solid var(--border);border-radius:13px;background:var(--bg);color:var(--text-secondary);cursor:pointer;text-align:left}.prob-v2-ch8 .information-tabs button strong,.prob-v2-ch8 .information-tabs button span{display:block}.prob-v2-ch8 .information-tabs button strong{color:var(--text);font-size:13px}.prob-v2-ch8 .information-tabs button span{margin-top:4px;font-size:9px}.prob-v2-ch8 .information-tabs button.active{border-color:var(--condition);background:var(--condition-soft)}.prob-v2-ch8 .bag-condition-board{display:grid;grid-template-columns:minmax(580px,1.15fr) minmax(350px,.85fr);gap:18px;align-items:stretch}.prob-v2-ch8 .bag-history,.prob-v2-ch8 .bag-result{padding:20px;border:1px solid var(--border);border-radius:17px;background:var(--bg-surface)}.prob-v2-ch8 .bag-stage{display:flex;gap:14px;align-items:center;min-height:150px;margin-top:14px;padding:18px;border:1px dashed var(--border-strong);border-radius:50% 50% 18px 18px;background:var(--bg)}.prob-v2-ch8 .condition-ball{display:grid;place-items:center;width:58px;height:58px;border:2px solid color-mix(in srgb,var(--target) 72%,var(--text));border-radius:50%;background:var(--target-soft);color:var(--text);font-weight:800}.prob-v2-ch8 .condition-ball.blue{border-color:var(--condition);background:var(--condition-soft)}.prob-v2-ch8 .drawn-ball{margin-right:12px;outline:3px solid var(--accent);outline-offset:4px}.prob-v2-ch8 .mixture-history{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:14px}.prob-v2-ch8 .mixture-history div{padding:14px;border:1px solid var(--border);border-radius:11px;background:var(--bg);color:var(--text-secondary);font-size:11px;line-height:1.55}.prob-v2-ch8 .mixture-history strong{display:block;margin-bottom:5px;color:var(--text)}.prob-v2-ch8 .bag-result{display:grid;align-content:center;border-color:var(--target);background:var(--target-soft)}.prob-v2-ch8 .bag-result>strong{display:block;margin:8px 0;color:var(--text);font-size:37px}.prob-v2-ch8 .bag-result p{color:var(--text-secondary);font-size:12px;line-height:1.65}.prob-v2-ch8 .transfer-check{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center;padding:19px;border:1px solid var(--border);border-radius:16px;background:var(--bg-surface)}@media(prefers-reduced-motion:reduce){.prob-v2-ch8 .condition-area,.prob-v2-ch8 .intersection-area{transition:none!important}}.prob-v2-ch9{--event-a: #b77d69;--event-a-soft: color-mix(in srgb, var(--event-a) 17%, transparent);--condition: #6f92ad;--condition-soft: color-mix(in srgb, var(--condition) 17%, transparent);--stable: #788f69;--stable-soft: color-mix(in srgb, var(--stable) 18%, transparent);--changed: #a85f5f;--changed-soft: color-mix(in srgb, var(--changed) 16%, transparent)}.prob-v2-ch9 .independence-prediction{display:grid;grid-template-columns:minmax(520px,1fr) auto;gap:22px;align-items:center}.prob-v2-ch9 .ratio-worlds{display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:stretch}.prob-v2-ch9 .ratio-panel{padding:19px;border:1px solid var(--border);border-radius:17px;background:var(--bg-surface)}.prob-v2-ch9 .ratio-panel.conditioned{border-color:var(--condition);background:var(--condition-soft)}.prob-v2-ch9 .ratio-arrow{display:grid;place-items:center;width:74px;color:var(--condition);font-size:11px;font-weight:750;text-align:center}.prob-v2-ch9 .path-world{display:grid;grid-template-columns:repeat(var(--path-count),1fr);gap:9px;margin-top:14px}.prob-v2-ch9 .path-tile{display:grid;place-items:center;min-height:112px;border:1px solid var(--border);border-radius:12px;background:var(--bg);color:var(--text-muted);text-align:center}.prob-v2-ch9 .path-tile strong{color:var(--text);font-family:JetBrains Mono,monospace;font-size:18px}.prob-v2-ch9 .path-tile span{font-size:9px}.prob-v2-ch9 .path-tile.in-a{border-color:var(--event-a);background:var(--event-a-soft)}.prob-v2-ch9 .path-tile.discarded{border-style:dashed;opacity:.2}.prob-v2-ch9 .ratio-readout{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center;margin-top:14px;padding-top:13px;border-top:1px solid var(--border)}.prob-v2-ch9 .ratio-readout span{color:var(--text-secondary);font-size:11px}.prob-v2-ch9 .ratio-readout strong{color:var(--text);font-size:23px}.prob-v2-ch9 .invariant-badge{display:grid;place-items:center;padding:17px;border:1px solid var(--stable);border-radius:15px;background:var(--stable-soft);color:var(--text);text-align:center}.prob-v2-ch9 .invariant-badge span{color:var(--text-secondary);font-size:10px}.prob-v2-ch9 .invariant-badge strong{display:block;margin-top:5px;font-size:19px}.prob-v2-ch9 .scenario-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.prob-v2-ch9 .scenario-tabs button{padding:15px;border:1px solid var(--border);border-radius:13px;background:var(--bg);color:var(--text-secondary);cursor:pointer;text-align:left}.prob-v2-ch9 .scenario-tabs button strong,.prob-v2-ch9 .scenario-tabs button span{display:block}.prob-v2-ch9 .scenario-tabs button strong{color:var(--text);font-size:13px}.prob-v2-ch9 .scenario-tabs button span{margin-top:4px;font-size:9px}.prob-v2-ch9 .scenario-tabs button.active{border-color:var(--condition);background:var(--condition-soft)}.prob-v2-ch9 .concept-check-board{display:grid;grid-template-columns:minmax(590px,1.15fr) minmax(340px,.85fr);gap:18px}.prob-v2-ch9 .outcome-checker,.prob-v2-ch9 .concept-verdict{padding:19px;border:1px solid var(--border);border-radius:17px;background:var(--bg-surface)}.prob-v2-ch9 .checker-row{display:grid;grid-template-columns:repeat(var(--outcome-count),1fr);gap:8px;margin-top:14px}.prob-v2-ch9 .checker-cell{display:grid;place-items:center;min-height:78px;border:1px solid var(--border);border-radius:10px;background:var(--bg);color:var(--text-muted);text-align:center}.prob-v2-ch9 .checker-cell.in-a{border-color:var(--event-a);background:var(--event-a-soft)}.prob-v2-ch9 .checker-cell.in-b{box-shadow:inset 0 -4px 0 var(--condition)}.prob-v2-ch9 .checker-cell.in-b:after{content:"B";color:var(--condition);font-size:8px}.prob-v2-ch9 .checker-cell.in-both{outline:2px solid var(--stable);outline-offset:-4px}.prob-v2-ch9 .condition-ratios{display:grid;grid-template-columns:1fr auto 1fr;gap:9px;align-items:center;margin-top:15px}.prob-v2-ch9 .condition-ratios div{padding:13px;border:1px solid var(--border);border-radius:10px;background:var(--bg);text-align:center}.prob-v2-ch9 .condition-ratios span{display:block;color:var(--text-muted);font-size:8px}.prob-v2-ch9 .condition-ratios strong{display:block;margin-top:5px;color:var(--text);font-size:18px}.prob-v2-ch9 .condition-ratios i{color:var(--condition);font-style:normal}.prob-v2-ch9 .concept-verdict{display:grid;align-content:center}.prob-v2-ch9 .concept-verdict.independent{border-color:var(--stable);background:var(--stable-soft)}.prob-v2-ch9 .concept-verdict.dependent{border-color:var(--changed);background:var(--changed-soft)}.prob-v2-ch9 .verdict-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin:13px 0}.prob-v2-ch9 .verdict-grid div{padding:13px;border:1px solid var(--border);border-radius:10px;background:var(--bg)}.prob-v2-ch9 .verdict-grid span{display:block;color:var(--text-muted);font-size:8px}.prob-v2-ch9 .verdict-grid strong{display:block;margin-top:5px;color:var(--text);font-size:14px}.prob-v2-ch9 .population-buttons{display:flex;gap:8px}.prob-v2-ch9 .population-buttons button{min-width:68px;padding:10px 12px;border:1px solid var(--border);border-radius:10px;background:var(--bg);color:var(--text-secondary);cursor:pointer}.prob-v2-ch9 .population-buttons button.active{border-color:var(--condition);background:var(--condition-soft);color:var(--text)}.prob-v2-ch9 .replacement-board{display:grid;grid-template-columns:minmax(620px,1.2fr) minmax(330px,.8fr);gap:18px}.prob-v2-ch9 .shift-visual,.prob-v2-ch9 .shift-summary{padding:20px;border:1px solid var(--border);border-radius:17px;background:var(--bg-surface)}.prob-v2-ch9 .probability-bar{display:grid;grid-template-columns:150px 1fr 80px;gap:13px;align-items:center;margin-top:18px}.prob-v2-ch9 .probability-bar span{color:var(--text-secondary);font-size:11px}.prob-v2-ch9 .probability-track{height:38px;overflow:hidden;border:1px solid var(--border);border-radius:9px;background:var(--bg)}.prob-v2-ch9 .probability-fill{height:100%;background:repeating-linear-gradient(135deg,transparent 0 7px,color-mix(in srgb,var(--event-a) 24%,transparent) 7px 11px),var(--event-a-soft);border-right:3px solid var(--event-a);transition:width .2s ease}.prob-v2-ch9 .probability-bar strong{color:var(--text);font-family:JetBrains Mono,monospace;text-align:right}.prob-v2-ch9 .shift-summary{display:grid;align-content:center}.prob-v2-ch9 .shift-summary>strong{display:block;margin:7px 0;color:var(--text);font-size:33px}.prob-v2-ch9 .shift-summary.exact{border-color:var(--stable);background:var(--stable-soft)}.prob-v2-ch9 .shift-summary.approximate{border-color:var(--condition);background:var(--condition-soft)}.prob-v2-ch9 .shift-summary.changed{border-color:var(--changed);background:var(--changed-soft)}.prob-v2-ch9 .bag-scale{display:flex;gap:5px;align-items:center;margin-top:16px}.prob-v2-ch9 .bag-scale i{display:block;width:10px;height:10px;border-radius:50%;background:var(--event-a)}.prob-v2-ch9 .bag-scale i.blue{background:var(--condition)}.prob-v2-ch9 .bag-scale span{margin-left:8px;color:var(--text-muted);font-size:9px}.prob-v2-ch9 .joint-board{display:grid;grid-template-columns:minmax(610px,1.15fr) minmax(340px,.85fr);gap:18px}.prob-v2-ch9 .joint-grid-panel,.prob-v2-ch9 .joint-stats{padding:19px;border:1px solid var(--border);border-radius:17px;background:var(--bg-surface)}.prob-v2-ch9 .joint-grid{display:grid;grid-template-columns:repeat(10,1fr);gap:4px;margin-top:14px}.prob-v2-ch9 .joint-tile{display:grid;place-items:center;min-height:27px;border:1px solid var(--border);border-radius:6px;background:var(--bg);color:var(--text-muted);font-size:7px}.prob-v2-ch9 .joint-tile.ss{border-color:var(--stable);background:var(--stable-soft);color:var(--text)}.prob-v2-ch9 .joint-tile.sf,.prob-v2-ch9 .joint-tile.fs{border-color:var(--condition);background:repeating-linear-gradient(135deg,var(--condition-soft) 0 5px,transparent 5px 9px),var(--bg)}.prob-v2-ch9 .joint-tile.ff{border-color:var(--changed);background:var(--changed-soft);color:var(--text)}.prob-v2-ch9 .joint-legend{display:flex;gap:14px;margin-top:12px;color:var(--text-secondary);font-size:9px}.prob-v2-ch9 .joint-stats{display:grid;gap:9px}.prob-v2-ch9 .joint-stat{padding:14px;border:1px solid var(--border);border-radius:11px;background:var(--bg)}.prob-v2-ch9 .joint-stat span{display:block;color:var(--text-muted);font-size:8px}.prob-v2-ch9 .joint-stat strong{display:block;margin-top:5px;color:var(--text);font-size:23px}.prob-v2-ch9 .joint-stat.highlight{border-color:var(--stable);background:var(--stable-soft)}.prob-v2-ch9 .marginal-lock{display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:center;padding:17px;border:1px solid var(--accent-30);border-radius:15px;background:var(--accent-10)}.prob-v2-ch9 .marginal-lock div{text-align:center}.prob-v2-ch9 .marginal-lock span{display:block;color:var(--text-muted);font-size:8px}.prob-v2-ch9 .marginal-lock strong{display:block;margin-top:5px;color:var(--text);font-size:16px}.prob-v2-ch9 .marginal-lock i{color:var(--accent);font-style:normal}@media(prefers-reduced-motion:reduce){.prob-v2-ch9 .probability-fill{transition:none!important}}.prob-v2-ch10{--hypothesis: #788f69;--hypothesis-soft: color-mix(in srgb, var(--hypothesis) 18%, transparent);--alternative: #6f92ad;--alternative-soft: color-mix(in srgb, var(--alternative) 17%, transparent);--evidence: #b77d69;--evidence-soft: color-mix(in srgb, var(--evidence) 17%, transparent);--false-positive: #a85f5f;--false-positive-soft: color-mix(in srgb, var(--false-positive) 16%, transparent)}.prob-v2-ch10 .bayes-prediction{display:grid;grid-template-columns:minmax(520px,1fr) auto;gap:22px;align-items:center}.prob-v2-ch10 .frequency-board{display:grid;grid-template-columns:minmax(620px,1.2fr) minmax(330px,.8fr);gap:18px}.prob-v2-ch10 .frequency-panel,.prob-v2-ch10 .evidence-pool{padding:19px;border:1px solid var(--border);border-radius:17px;background:var(--bg-surface)}.prob-v2-ch10 .morning-grid{display:grid;grid-template-columns:repeat(10,1fr);gap:6px;margin-top:14px}.prob-v2-ch10 .morning-tile{display:grid;place-items:center;min-height:39px;border:1px solid var(--border);border-radius:7px;background:var(--bg);color:var(--text-muted);font-size:7px}.prob-v2-ch10 .morning-tile.rain{border-color:var(--hypothesis);background:var(--hypothesis-soft)}.prob-v2-ch10 .morning-tile.wet{box-shadow:inset 0 -4px 0 var(--evidence)}.prob-v2-ch10 .morning-tile.in-frame{outline:2px solid var(--text);outline-offset:-3px;color:var(--text)}.prob-v2-ch10 .morning-tile.outside-frame{opacity:.16}.prob-v2-ch10 .frequency-legend{display:flex;flex-wrap:wrap;gap:14px;margin-top:12px;color:var(--text-secondary);font-size:9px}.prob-v2-ch10 .frequency-legend i{display:inline-block;width:11px;height:11px;margin-right:5px;border:1px solid var(--hypothesis);border-radius:3px;background:var(--hypothesis-soft);vertical-align:-1px}.prob-v2-ch10 .frequency-legend i.wet{border-color:var(--evidence);background:var(--evidence-soft)}.prob-v2-ch10 .frequency-legend i.false-positive{border-color:var(--false-positive);background:var(--false-positive)}.prob-v2-ch10 .evidence-pool{display:grid;align-content:center;border-color:var(--evidence);background:var(--evidence-soft)}.prob-v2-ch10 .direction-fraction{display:grid;grid-template-columns:1fr auto 1fr;gap:9px;align-items:center;margin:13px 0}.prob-v2-ch10 .direction-fraction 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.mini-checks{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;max-width:820px;margin:15px auto 0}app-algebra-v2-lesson .mini-checks>div{display:grid;grid-template-columns:auto 1fr;gap:10px;align-items:start;padding:11px;border:1px solid var(--border);border-radius:11px;background:var(--bg)}app-algebra-v2-lesson .mini-checks>div.pass{border-color:color-mix(in srgb,var(--success) 45%,var(--border))}app-algebra-v2-lesson .mini-checks>div.fail{border-color:color-mix(in srgb,var(--failure) 45%,var(--border))}app-algebra-v2-lesson .mini-checks>div>span{color:var(--success);font-weight:800}app-algebra-v2-lesson .mini-checks>div.fail>span{color:var(--failure)}app-algebra-v2-lesson .mini-checks p{margin:0;color:var(--text-secondary);font-size:11px;line-height:1.55}app-algebra-v2-lesson .mini-checks strong{display:block;color:var(--text)}app-algebra-v2-lesson .cayley-wrap{display:grid;grid-template-columns:minmax(420px,1fr) minmax(230px,.65fr);gap:24px;align-items:center;max-width:820px;margin:0 auto}app-algebra-v2-lesson .cayley-table{width:100%;overflow:hidden;border-collapse:separate;border-spacing:5px;color:var(--text-secondary);text-align:center}app-algebra-v2-lesson .cayley-table th,app-algebra-v2-lesson .cayley-table td{height:54px;border:1px solid var(--border);border-radius:9px;background:var(--bg);font-family:JetBrains Mono,monospace;font-size:13px}app-algebra-v2-lesson .cayley-table td{padding:0;border:0;background:transparent}app-algebra-v2-lesson .cayley-table td button{width:100%;height:54px;padding:0;border-color:var(--border);font-family:JetBrains Mono,monospace;font-size:13px}app-algebra-v2-lesson .cayley-table th{color:var(--text);background:var(--bg-elevated)}app-algebra-v2-lesson .cayley-table td button.highlight{border:2px solid var(--action);background:var(--action-soft);color:var(--action);font-size:18px;font-weight:800}app-algebra-v2-lesson .cayley-table td button.selected{outline:3px solid var(--accent-30);outline-offset:1px;border-color:var(--accent);background:var(--accent-18);color:var(--text)}app-algebra-v2-lesson .table-readout{padding:18px;border:1px solid var(--accent-30);border-radius:14px;background:var(--accent-10)}app-algebra-v2-lesson .table-readout span{color:var(--text-muted);font-size:9px;font-weight:800;letter-spacing:.08em}app-algebra-v2-lesson .table-readout strong{display:block;margin:6px 0 8px;color:var(--text);font-family:JetBrains Mono,monospace;font-size:20px}app-algebra-v2-lesson .table-readout p{margin:0;color:var(--text-secondary);font-size:11px;line-height:1.6}app-algebra-v2-lesson .diagnostic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;max-width:860px;margin:12px auto}app-algebra-v2-lesson .diagnostic-item{display:grid;grid-template-columns:auto 1fr;gap:13px;align-items:start;min-height:94px;padding:15px;border:1px solid var(--border);border-radius:14px;background:var(--bg)}app-algebra-v2-lesson .diagnostic-item.pass{border-color:color-mix(in srgb,var(--success) 45%,var(--border))}app-algebra-v2-lesson .diagnostic-item.fail{border-color:color-mix(in srgb,var(--failure) 45%,var(--border))}app-algebra-v2-lesson .diagnostic-item.focused{outline:3px solid var(--accent-30);outline-offset:2px;transform:translateY(-2px)}app-algebra-v2-lesson .status-mark{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--success-soft);color:var(--success);font-weight:900}app-algebra-v2-lesson .fail .status-mark{background:var(--failure-soft);color:var(--failure)}app-algebra-v2-lesson .diagnostic-item strong{color:var(--text);font-size:13px}app-algebra-v2-lesson .diagnostic-item p{margin:5px 0 0;color:var(--text-secondary);font-size:11px;line-height:1.55}app-algebra-v2-lesson .closure-machine{display:grid;grid-template-columns:minmax(260px,1fr) minmax(150px,.6fr) minmax(190px,.75fr);gap:16px;align-items:stretch;max-width:870px;margin:14px auto}app-algebra-v2-lesson .set-boundary,app-algebra-v2-lesson .machine-core,app-algebra-v2-lesson .machine-output{display:grid;gap:8px;place-content:center;min-height:170px;padding:17px;border:1px solid var(--border);border-radius:16px;background:var(--bg);text-align:center}app-algebra-v2-lesson .set-boundary{border:2px dashed var(--state);background:var(--state-soft)}app-algebra-v2-lesson .set-boundary>span,app-algebra-v2-lesson .machine-core>span,app-algebra-v2-lesson .machine-output>span{color:var(--text-muted);font-size:9px;font-weight:800;letter-spacing:.08em}app-algebra-v2-lesson .set-boundary strong,app-algebra-v2-lesson .machine-core strong,app-algebra-v2-lesson .machine-output strong{color:var(--text);font-size:15px;line-height:1.4}app-algebra-v2-lesson .input-pair{padding:8px;border:1px solid var(--border);border-radius:9px;background:var(--bg-surface);color:var(--state);font-family:JetBrains Mono,monospace;font-weight:800}app-algebra-v2-lesson .machine-core{border-color:color-mix(in srgb,var(--action) 55%,var(--border));background:var(--action-soft)}app-algebra-v2-lesson .machine-core i{color:var(--action);font-size:24px;font-style:normal}app-algebra-v2-lesson .machine-output.inside{border-color:var(--success);background:var(--success-soft)}app-algebra-v2-lesson .machine-output.outside{border:2px solid var(--failure);background:var(--failure-soft)}app-algebra-v2-lesson .machine-output strong{font-family:JetBrains Mono,monospace;font-size:28px}app-algebra-v2-lesson .machine-output small{color:var(--text-secondary)}app-algebra-v2-lesson .symbol-translator{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;max-width:820px;margin:30px auto}app-algebra-v2-lesson .symbol-translator>button{display:grid;grid-template-columns:1fr auto 70px;gap:14px;align-items:center;min-height:88px;padding:14px 17px;border:1px solid var(--border);border-radius:14px;background:var(--bg);text-align:left}app-algebra-v2-lesson .symbol-translator>button.focused{border-color:var(--action);background:var(--action-soft)}app-algebra-v2-lesson .cube-lab{display:grid;grid-template-columns:minmax(360px,1.15fr) minmax(250px,.85fr);gap:36px;align-items:center;max-width:880px;min-height:280px;margin:0 auto}app-algebra-v2-lesson .cube-scene{display:grid;min-height:260px;place-items:center;perspective:760px}app-algebra-v2-lesson .cube{position:relative;width:150px;height:150px;transform-style:preserve-3d;transition:transform .65s cubic-bezier(.2,.75,.25,1)}app-algebra-v2-lesson .cube-face{position:absolute;display:grid;width:150px;height:150px;place-items:center;border:2px solid color-mix(in srgb,var(--state) 70%,var(--border));background:color-mix(in srgb,var(--state) 19%,var(--bg));color:var(--text-muted);font-family:JetBrains Mono,monospace;font-size:9px;font-weight:800;letter-spacing:.08em;backface-visibility:visible}app-algebra-v2-lesson .cube-face.front{transform:translateZ(75px)}app-algebra-v2-lesson .cube-face.back{transform:rotateY(180deg) translateZ(75px)}app-algebra-v2-lesson .cube-face.right{transform:rotateY(90deg) translateZ(75px)}app-algebra-v2-lesson .cube-face.left{transform:rotateY(-90deg) translateZ(75px)}app-algebra-v2-lesson .cube-face.top{transform:rotateX(90deg) translateZ(75px)}app-algebra-v2-lesson .cube-face.bottom{transform:rotateX(-90deg) translateZ(75px)}app-algebra-v2-lesson .cube-vertex{position:absolute;top:-12px;right:-12px;display:grid;width:30px;height:30px;place-items:center;transform:translateZ(78px);border:3px solid var(--bg);border-radius:50%;background:var(--action);color:#fff;font-weight:900}app-algebra-v2-lesson .cube-console{display:grid;gap:12px;padding:22px;border-left:3px solid var(--action);background:var(--action-soft)}app-algebra-v2-lesson .cube-console>span,app-algebra-v2-lesson .cube-counter span{color:var(--text-muted);font-size:9px;font-weight:850;letter-spacing:.1em}app-algebra-v2-lesson .cube-console>strong{color:var(--text);font-size:19px}app-algebra-v2-lesson .cube-console p{margin:0;color:var(--text-secondary);font-size:12px;line-height:1.65}app-algebra-v2-lesson .cube-counter{display:flex;align-items:baseline;justify-content:space-between;padding:10px 0;border-block:1px solid var(--border)}app-algebra-v2-lesson .cube-counter b{color:var(--action);font-family:JetBrains Mono,monospace;font-size:22px}app-algebra-v2-lesson .cube-checks{grid-template-columns:repeat(3,minmax(0,1fr))}app-algebra-v2-lesson .symbol-translator span{color:var(--text-secondary);font-size:13px}app-algebra-v2-lesson .symbol-translator i{color:var(--action);font-style:normal}app-algebra-v2-lesson .symbol-translator strong{color:var(--action);font-family:JetBrains Mono,monospace;font-size:22px;text-align:center}app-algebra-v2-lesson .insight-card{display:grid;grid-template-columns:minmax(190px,.65fr) minmax(360px,1.35fr);gap:24px;align-items:center;padding:24px;border:1px solid var(--accent-30);border-radius:19px;background:linear-gradient(135deg,var(--accent-10),transparent)}app-algebra-v2-lesson .insight-icon{display:flex;align-items:center;justify-content:center;gap:9px}app-algebra-v2-lesson .insight-icon span{display:grid;place-items:center;min-width:70px;min-height:50px;padding:8px;border:1px solid var(--border-strong);border-radius:12px;background:var(--bg);color:var(--text);font-family:JetBrains Mono,monospace;font-size:11px}app-algebra-v2-lesson .insight-icon span:last-child{border-color:color-mix(in srgb,var(--action) 55%,var(--border));background:var(--action-soft);color:var(--action)}app-algebra-v2-lesson .insight-icon i{color:var(--accent);font-style:normal}app-algebra-v2-lesson .insight-card p{margin:5px 0 0;color:var(--text);font-size:18px;font-weight:680;line-height:1.6}app-algebra-v2-lesson .transfer-card{background:radial-gradient(circle at 0 100%,var(--state-soft),transparent 35%),var(--bg-surface)}app-algebra-v2-lesson .formal-zone{display:grid;gap:9px;margin-top:4px;padding-top:25px;border-top:1px solid var(--border)}app-algebra-v2-lesson .formal-zone-heading{display:grid;grid-template-columns:1fr minmax(250px,.8fr);gap:24px;align-items:end;margin-bottom:7px}app-algebra-v2-lesson .formal-zone-heading span{display:block;margin-bottom:4px;color:var(--text-muted)}app-algebra-v2-lesson .formal-zone-heading h3{margin:0;font-size:18px}app-algebra-v2-lesson .formal-zone-heading p{margin:0 0 2px;color:var(--text-muted);font-size:12px;line-height:1.55}app-algebra-v2-lesson .formal-panel{overflow:clip;border:1px solid var(--border);border-radius:13px;background:var(--bg-surface)}app-algebra-v2-lesson .formal-panel[open]{border-color:var(--border-strong)}app-algebra-v2-lesson .formal-panel summary{display:grid;grid-template-columns:34px 1fr;gap:11px;align-items:center;padding:13px 15px;cursor:pointer;list-style:none}app-algebra-v2-lesson .formal-panel summary::-webkit-details-marker{display:none}app-algebra-v2-lesson .formal-panel summary>span{display:grid;place-items:center;width:30px;height:30px;border-radius:9px;background:var(--bg-elevated);color:var(--text-muted);font-family:JetBrains Mono,monospace;font-size:9px;font-weight:800}app-algebra-v2-lesson .formal-panel summary strong,app-algebra-v2-lesson .formal-panel summary small{display:block}app-algebra-v2-lesson .formal-panel summary strong{color:var(--text);font-size:13px}app-algebra-v2-lesson .formal-panel summary small{margin-top:2px;color:var(--text-muted);font-size:11px}app-algebra-v2-lesson .formal-content{padding:3px 20px 18px 60px;color:var(--text-secondary);font-size:13px;line-height:1.75}app-algebra-v2-lesson .formal-content p{margin-bottom:10px}app-algebra-v2-lesson .math-line{overflow-x:auto;padding:13px;border-radius:10px;background:var(--bg);color:var(--text);text-align:center}app-algebra-v2-lesson .boundary-content{border-left:3px solid var(--warning);margin:0 20px 18px 60px;padding:12px 15px;border-radius:0 10px 10px 0;background:var(--warning-soft)}app-algebra-v2-lesson .boundary-content p{margin:0}app-algebra-v2-lesson .proof-layout{display:grid;grid-template-columns:minmax(260px,.8fr) minmax(420px,1.2fr);gap:18px;padding:5px 18px 20px}app-algebra-v2-lesson .proof-anchor{align-self:start;padding:17px;border:1px solid var(--accent-30);border-radius:13px;background:var(--accent-10)}app-algebra-v2-lesson .proof-anchor>span{color:var(--accent);font-size:9px;font-weight:800;letter-spacing:.1em}app-algebra-v2-lesson .proof-anchor strong{display:block;margin:7px 0 10px;color:var(--text);font-size:14px;line-height:1.55}app-algebra-v2-lesson .proof-anchor p{margin:0;color:var(--text-secondary);font-size:12px;line-height:1.65}app-algebra-v2-lesson .proof-steps{display:grid;gap:8px}app-algebra-v2-lesson .proof-steps>div:not(.proof-controls){display:grid;grid-template-columns:26px 1fr;gap:10px;align-items:start;min-height:48px;padding:10px;border:1px dashed var(--border);border-radius:10px;opacity:.65}app-algebra-v2-lesson .proof-steps>div.visible{border-style:solid;border-color:var(--border-strong);background:var(--bg);opacity:1}app-algebra-v2-lesson .proof-steps>div>span{display:grid;place-items:center;width:24px;height:24px;border-radius:50%;background:var(--bg-elevated);color:var(--text-muted);font-size:9px;font-weight:800}app-algebra-v2-lesson .proof-steps>div.visible>span{background:var(--action-soft);color:var(--action)}app-algebra-v2-lesson .proof-steps p{margin:2px 0 0;color:var(--text-secondary);font-size:12px;line-height:1.55}app-algebra-v2-lesson .proof-controls{display:flex;gap:8px;margin-top:3px}app-algebra-v2-lesson .proof-controls button{min-height:35px;padding:6px 11px;font-size:11px}app-algebra-v2-lesson .proof-controls button.quiet{border-color:transparent;background:transparent;color:var(--text-muted)}@media(max-width:900px){app-algebra-v2-lesson .transform-stage,app-algebra-v2-lesson .timeline-stage,app-algebra-v2-lesson .closure-machine,app-algebra-v2-lesson .cayley-wrap,app-algebra-v2-lesson .cube-lab,app-algebra-v2-lesson .proof-layout{grid-template-columns:1fr}app-algebra-v2-lesson .network-stage{grid-template-columns:1fr}app-algebra-v2-lesson .transform-arrow{grid-template-columns:auto auto}app-algebra-v2-lesson .timeline-stage{gap:10px}app-algebra-v2-lesson .timeline-controls{grid-template-columns:1fr}app-algebra-v2-lesson .action-track{flex-wrap:wrap}}@media(prefers-reduced-motion:reduce){app-algebra-v2-lesson button,app-algebra-v2-lesson .shape-panel g,app-algebra-v2-lesson .action-chip,app-algebra-v2-lesson .cube{transition:none!important}}.alg-ch1-lesson{display:grid;gap:30px;--action: #b76f52;--action-soft: color-mix(in srgb, var(--action) 15%, transparent);--state: 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0,var(--action-soft),transparent 35%),var(--bg-surface)}.alg-ch1-lesson .prediction h3,.alg-ch1-lesson .transfer h3{max-width:820px;margin-bottom:13px}.alg-ch1-lesson .choice-row,.alg-ch1-lesson .action-row,.alg-ch1-lesson .direct-controls{display:flex;flex-wrap:wrap;gap:8px}.alg-ch1-lesson button{min-height:40px;padding:8px 13px;border:1px solid var(--border-strong);border-radius:10px;background:var(--bg);color:var(--text-secondary);cursor:pointer;font:inherit;font-size:12px;font-weight:730;transition:border-color .16s ease,background .16s ease,color .16s ease,transform .16s ease,opacity .16s ease}.alg-ch1-lesson button:hover:not(:disabled){border-color:var(--accent);color:var(--text)}.alg-ch1-lesson button:focus-visible,.alg-ch1-lesson summary:focus-visible,.alg-ch1-lesson input:focus-visible{outline:3px solid var(--accent-30);outline-offset:3px}.alg-ch1-lesson button:active:not(:disabled){transform:translateY(1px)}.alg-ch1-lesson button.selected,.alg-ch1-lesson button.active{border-color:var(--accent);background:var(--accent-18);color:var(--text)}.alg-ch1-lesson button:disabled{cursor:default;opacity:.58}.alg-ch1-lesson .feedback{margin:14px 0 0;padding:12px 14px;border-left:3px solid var(--ok);border-radius:0 10px 10px 0;background:var(--ok-soft);color:var(--text-secondary);font-size:13px;line-height:1.65}.alg-ch1-lesson .feedback.warning{border-color:var(--no);background:var(--no-soft)}.alg-ch1-lesson .feedback strong{color:var(--text)}.alg-ch1-lesson .lab{display:grid;gap:14px}.alg-ch1-lesson .lab-heading{display:flex;gap:22px;align-items:end;justify-content:space-between}.alg-ch1-lesson .lab-heading h3,.alg-ch1-lesson .lab-heading p{margin-bottom:0}.alg-ch1-lesson .lab-heading>p{max-width:480px;color:var(--text-secondary);font-size:12px;line-height:1.6}.alg-ch1-lesson .stage{min-height:310px;padding:22px;border:1px solid var(--border);border-radius:20px;background:linear-gradient(135deg,var(--state-soft),transparent 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.endpoint.mismatch{border-style:dashed;border-color:#e66b6b}.rings-lesson .same-stamp{text-align:center;font-weight:850;letter-spacing:.08em;color:var(--whole)}.rings-lesson .same-stamp.fail{color:#e66b6b}.rings-lesson .tile-lab{min-height:390px;display:grid;align-content:center;gap:18px}.rings-lesson .tile-board{display:grid;gap:3px;width:min(100%,720px);margin:0 auto}.rings-lesson .tile-cell{aspect-ratio:1.45;min-height:24px;border:1px solid color-mix(in srgb,var(--text) 18%,transparent);border-radius:3px;display:grid;place-items:center;font-size:10px;color:var(--text-muted)}.rings-lesson .tile-cell.left{background:repeating-linear-gradient(135deg,color-mix(in srgb,var(--whole) 24%,transparent) 0 5px,color-mix(in srgb,var(--whole) 9%,transparent) 5px 10px)}.rings-lesson .tile-cell.right{background:repeating-linear-gradient(45deg,color-mix(in srgb,var(--split) 22%,transparent) 0 4px,color-mix(in srgb,var(--split) 7%,transparent) 4px 9px)}.rings-lesson .tile-cell.seam{border-left:3px solid var(--text)}.rings-lesson .tile-legend{display:flex;justify-content:center;gap:18px;color:var(--text-secondary)}.rings-lesson .tile-legend i{display:inline-block;width:18px;height:12px;margin-right:5px;border-radius:2px}.rings-lesson .tile-legend .left{background:var(--whole)}.rings-lesson .tile-legend .right{background:var(--split)}.rings-lesson label.compact-control{display:flex;align-items:center;gap:7px}.rings-lesson label.compact-control input{width:115px;accent-color:var(--whole)}.rings-lesson .fault-layout{display:grid;grid-template-columns:minmax(260px,.72fr) minmax(0,1.28fr);gap:18px;align-items:center}.rings-lesson .operation-table{display:grid;grid-template-columns:repeat(4,52px);gap:5px;justify-content:center}.rings-lesson .table-cell{min-height:48px;display:grid;place-items:center;border:1px solid var(--border);border-radius:8px;background:var(--bg);font-weight:750}.rings-lesson .table-cell.header{color:var(--text-muted);background:transparent;border-color:transparent}.rings-lesson .table-cell.changed{border:3px dashed #e66b6b;position:relative}.rings-lesson .table-cell.changed:after{content:"was 0";position:absolute;top:-15px;right:-10px;padding:1px 4px;background:var(--bg-surface);color:#e66b6b;font-size:9px}.rings-lesson .test-badges{display:flex;gap:9px;justify-content:center;margin-top:12px;flex-wrap:wrap}.rings-lesson .test-badges span{padding:6px 9px;border:1px solid var(--border);border-radius:999px;font-size:12px}.rings-lesson .test-badges .pass{border-color:var(--whole)}.rings-lesson .test-badges .fail{border-color:#e66b6b}.rings-lesson .function-routes{min-height:390px;display:grid;align-content:center;gap:16px}.rings-lesson .function-route{display:grid;grid-template-columns:88px 1fr 1fr 1fr;gap:8px;align-items:center;border:2px solid var(--border);border-radius:15px;padding:12px}.rings-lesson .function-route.whole{border-color:var(--whole)}.rings-lesson .function-route.split{border-color:var(--split);border-style:dashed}.rings-lesson .function-route .cell{min-height:62px;display:grid;place-items:center;text-align:center;border-radius:10px;background:var(--bg)}.rings-lesson .function-route .cell strong{font-size:19px}.rings-lesson .function-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.rings-lesson .function-summary span{padding:9px;border:1px solid var(--border);border-radius:9px;text-align:center}.rings-lesson .function-summary span.focus{border-color:var(--ring-violet);background:color-mix(in srgb,var(--ring-violet) 10%,transparent)}.rings-lesson{--add-layer: var(--ring-add);--multiply-layer: var(--ring-multiply);--gear-layer: var(--ring-violet)}.rings-lesson .difference-stage{min-height:390px;display:grid;align-content:center;gap:24px;overflow:hidden}.rings-lesson .difference-rail{display:grid;grid-template-columns:repeat(13,minmax(38px,1fr));gap:4px;position:relative;padding:52px 0 22px}.rings-lesson .difference-rail:before{content:"";position:absolute;left:0;right:0;top:72px;border-top:3px solid var(--border-strong)}.rings-lesson .difference-node{position:relative;z-index:1;display:grid;justify-items:center;gap:5px}.rings-lesson .difference-node span{width:40px;height:40px;display:grid;place-items:center;border:2px solid var(--border-strong);border-radius:50%;background:var(--bg-surface);font-weight:750}.rings-lesson .difference-node.start span{border-color:var(--add-layer)}.rings-lesson .difference-node.target span{border-color:var(--gear-layer);border-width:4px}.rings-lesson .difference-node.missing span{opacity:.35;border-style:dashed}.rings-lesson .shift-arrow{min-height:66px;display:flex;align-items:center;justify-content:center;gap:12px}.rings-lesson .shift-line{width:min(420px,65%);border-top:5px solid var(--add-layer);position:relative}.rings-lesson .shift-line:after{content:"\203a";position:absolute;right:-5px;top:-19px;font-size:34px;color:var(--add-layer)}.rings-lesson .shift-line.reverse:after{right:auto;left:-5px;transform:rotate(180deg)}.rings-lesson .missing-card{padding:10px 14px;border:2px dashed #e66b6b;border-radius:10px;color:#e66b6b;font-weight:800}.rings-lesson .multiply-tape{min-height:380px;display:grid;align-content:center;gap:22px}.rings-lesson .tape-row{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap}.rings-lesson .factor-block{min-width:74px;min-height:66px;display:grid;place-items:center;border:4px double var(--multiply-layer);border-radius:12px;background:var(--bg);font-size:22px;font-weight:850}.rings-lesson .factor-block.identity{border-color:var(--text-muted);opacity:.65}.rings-lesson .compiler-frame{display:flex;align-items:center;gap:8px;padding:12px;border:2px solid var(--gear-layer);border-radius:16px}.rings-lesson .optional-socket{width:min(620px,100%);margin:0 auto;padding:14px 18px;border:2px dashed var(--multiply-layer);border-radius:14px;display:flex;justify-content:space-between;align-items:center;gap:15px}.rings-lesson .optional-socket.outside{border-color:#e66b6b}.rings-lesson .contract-lights{display:flex;justify-content:center;gap:9px;flex-wrap:wrap}.rings-lesson .contract-lights span{padding:7px 11px;border:1px solid var(--border);border-radius:999px}.rings-lesson .contract-lights .on{border-color:var(--multiply-layer)}.rings-lesson .contract-lights .optional{border-style:dashed}.rings-lesson .blueprint{min-height:410px;display:grid;grid-template-rows:1fr 88px 1fr;gap:10px;position:relative}.rings-lesson .blueprint-layer{border:3px solid var(--border);border-radius:18px;padding:18px;display:grid;grid-template-columns:140px 1fr;gap:16px;align-items:center;opacity:.36}.rings-lesson .blueprint-layer.connected{opacity:1}.rings-lesson .blueprint-layer.add{border-color:var(--add-layer)}.rings-lesson .blueprint-layer.multiply{border-color:var(--multiply-layer);border-style:double;border-width:6px}.rings-lesson .blueprint-layer h3{margin:0 0 4px}.rings-lesson .capability-flow{display:flex;gap:9px;flex-wrap:wrap}.rings-lesson .capability-flow span{min-width:100px;padding:10px;border:1px solid var(--border);border-radius:10px;text-align:center;background:var(--bg)}.rings-lesson .gearbox{width:88px;height:88px;margin:auto;display:grid;place-items:center;border:4px dashed var(--gear-layer);border-radius:50%;font-size:28px;font-weight:900;opacity:.35}.rings-lesson .gearbox.connected{opacity:1;background:color-mix(in srgb,var(--gear-layer) 10%,var(--bg))}.rings-lesson .scope-badge{display:inline-flex;align-items:center;gap:7px;padding:7px 10px;border:1px solid var(--border);border-radius:999px;font-size:12px}.rings-lesson .scope-badge.out{border-style:dashed;color:var(--text-muted)}.rings-lesson .zero-stage{min-height:400px;display:grid;align-content:center;gap:16px}.rings-lesson .zero-route{display:grid;grid-template-columns:130px 90px 1fr;gap:10px;align-items:center;padding:15px;border:2px solid var(--border);border-radius:15px}.rings-lesson .zero-route.whole{border-color:var(--add-layer)}.rings-lesson .zero-route.split{border-color:var(--multiply-layer);border-style:dashed}.rings-lesson .token-bin{min-height:72px;display:flex;align-items:center;justify-content:center;gap:9px;border-radius:11px;background:var(--bg)}.rings-lesson .z-token{width:52px;height:52px;display:grid;place-items:center;border:3px solid var(--gear-layer);border-radius:50%;font-weight:850}.rings-lesson .z-token.cancelled{opacity:.18;text-decoration:line-through}.rings-lesson .equation-lock{text-align:center;font-size:22px;font-weight:850}.rings-lesson .detector-board{min-height:420px;display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:18px}.rings-lesson .mini-blueprint{display:grid;grid-template-rows:1fr 74px 1fr;gap:8px}.rings-lesson .mini-module{border:3px solid var(--border);border-radius:16px;padding:16px;display:grid;grid-template-columns:120px 1fr;gap:12px;align-items:center}.rings-lesson .mini-module.add{border-color:var(--add-layer)}.rings-lesson .mini-module.multiply{border-color:var(--multiply-layer);border-style:double;border-width:5px}.rings-lesson .mini-gear{width:70px;height:70px;margin:auto;display:grid;place-items:center;border:3px dashed var(--gear-layer);border-radius:50%}.rings-lesson .witness-panel{display:grid;align-content:center;gap:11px;padding-left:18px;border-left:1px solid var(--border)}.rings-lesson .verdict-line{display:flex;justify-content:space-between;gap:12px;padding:10px;border:1px solid var(--border);border-radius:10px}.rings-lesson .verdict-line.pass{border-color:var(--add-layer)}.rings-lesson .verdict-line.fail{border-color:#e66b6b}.rings-lesson .verdict-line.out{border-style:dashed;border-color:var(--multiply-layer)}.rings-lesson .matrix-pair{display:grid;grid-template-columns:1fr auto 1fr;gap:8px;align-items:center;font-family:monospace;font-size:12px}.rings-lesson .general-banner{display:flex;justify-content:space-between;gap:16px;align-items:center;padding:11px 14px;border:1px dashed var(--gear-layer);border-radius:12px;background:color-mix(in srgb,var(--gear-layer) 7%,transparent);margin-bottom:14px}.rings-lesson .general-banner code{font-size:18px;font-weight:850}.rings-lesson .case-badge{display:inline-flex;padding:6px 9px;border:1px solid var(--multiply-layer);border-radius:999px;font-size:11px;font-weight:850;letter-spacing:.08em}.rings-lesson .dock-board{min-height:390px;display:grid;align-content:center;gap:16px}.rings-lesson .card-decks{display:grid;grid-template-columns:1fr 120px 1fr;gap:14px;align-items:center}.rings-lesson .residue-deck{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.rings-lesson .residue-card{min-height:52px!important;padding:5px!important;font-weight:800}.rings-lesson .product-machine{min-height:100px;display:grid;place-items:center;border:5px double var(--multiply-layer);border-radius:18px;text-align:center}.rings-lesson .identity-dock{width:min(520px,100%);margin:auto;padding:15px;border:3px dashed var(--gear-layer);border-radius:16px;text-align:center}.rings-lesson .identity-dock.docked{border-style:solid;background:color-mix(in srgb,var(--add-layer) 10%,transparent)}.rings-lesson .nested-world{min-height:410px;display:grid;place-items:center}.rings-lesson .q-world{width:min(720px,95%);min-height:310px;border:3px solid var(--gear-layer);border-radius:28px;padding:32px;position:relative;background:color-mix(in srgb,var(--gear-layer) 5%,transparent)}.rings-lesson .z-world{width:68%;min-height:190px;border:3px solid var(--add-layer);border-radius:20px;padding:25px;display:grid;place-items:center;background:var(--bg-surface)}.rings-lesson .world-label{position:absolute;top:9px;left:16px;font-weight:850}.rings-lesson .partner-card{padding:14px 18px;border:3px solid var(--multiply-layer);border-radius:12px;font-size:22px;font-weight:850}.rings-lesson .partner-card.outside{position:absolute;right:42px;bottom:42px}.rings-lesson .partner-card.none{border-style:dashed;border-color:#e66b6b}.rings-lesson .wiring-board{min-height:410px;display:grid;align-content:center;gap:12px}.rings-lesson .socket-row{display:grid;grid-template-columns:repeat(10,1fr);gap:6px}.rings-lesson .socket{min-height:42px;display:grid;place-items:center;border:2px solid var(--border);border-radius:9px;background:var(--bg);font-weight:750}.rings-lesson .socket.selected{border-color:var(--gear-layer);border-width:4px}.rings-lesson .socket.middle{border-color:var(--multiply-layer)}.rings-lesson .wire-history{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:9px;align-items:center;text-align:center;padding:14px;border:1px solid var(--border);border-radius:13px}.rings-lesson .wire-arrow{font-weight:850;color:var(--multiply-layer)}.rings-lesson .coverage-board{min-height:420px;display:grid;grid-template-columns:.75fr 1.25fr;gap:20px;align-items:center}.rings-lesson .input-ruler{display:grid;gap:5px}.rings-lesson .input-step{display:grid;grid-template-columns:50px 1fr;gap:8px;padding:7px;border:1px solid var(--border);border-radius:8px}.rings-lesson .input-step.visited{border-color:var(--add-layer)}.rings-lesson .coverage-wheel{position:relative;width:360px;height:360px;margin:auto;border:2px solid var(--border-strong);border-radius:50%}.rings-lesson .wheel-node{position:absolute;width:42px;height:42px;margin:-21px;display:grid;place-items:center;border:2px dashed var(--border-strong);border-radius:50%;background:var(--bg-surface);font-weight:800}.rings-lesson .wheel-node.visited{border-style:solid;border-color:var(--multiply-layer)}.rings-lesson .wheel-node.inverse{border-color:var(--add-layer);border-width:4px}.rings-lesson .wheel-node small{position:absolute;top:34px;font-size:9px;white-space:nowrap}.rings-lesson .unit-tape{min-height:400px;display:grid;align-content:center;gap:18px}.rings-lesson .abstract-tape,.rings-lesson .concrete-tape{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap}.rings-lesson .unit-card{min-width:100px;min-height:74px;display:grid;place-items:center;border:5px double var(--multiply-layer);border-radius:14px;background:var(--bg);font-size:20px;font-weight:850}.rings-lesson .unit-card.composite{border-color:var(--gear-layer)}.rings-lesson .unit-card.inverse{border-style:dashed;border-color:var(--add-layer)}.rings-lesson .unit-deck{display:flex;justify-content:center;gap:8px}.rings-lesson .unit-deck span{padding:9px 13px;border:2px solid var(--multiply-layer);border-radius:9px}.rings-lesson .unit-deck .outside{border-style:dashed;opacity:.45}.rings-lesson .inverse-functions{min-height:410px;display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:12px;align-items:center}.rings-lesson .inverse-function{border:2px solid var(--border);border-radius:15px;padding:14px;background:var(--bg)}.rings-lesson .inverse-function.complete{border-color:var(--add-layer)}.rings-lesson .inverse-function.incomplete{border-style:dashed;border-color:#e66b6b}.rings-lesson .inverse-lane{display:grid;grid-template-columns:30px 1fr 70px;gap:7px;align-items:center;padding:8px;margin:6px 0;border:1px solid var(--border);border-radius:9px}.rings-lesson .inverse-lane.blocked{border-style:dashed;border-color:#e66b6b}.rings-lesson .inverse-lane.focus{background:color-mix(in srgb,var(--gear-layer) 10%,transparent)}.rings-lesson .evidence-badge{display:inline-flex;align-items:center;padding:6px 9px;border:1px solid var(--gear-layer);border-radius:999px;font-size:10px;font-weight:850;letter-spacing:.08em}.rings-lesson .collision-stage{min-height:410px;display:grid;align-content:center;gap:18px}.rings-lesson .mapping-pair{display:grid;grid-template-columns:110px 1fr 140px;gap:14px;align-items:center}.rings-lesson .source-stack,.rings-lesson .output-stack{display:grid;gap:10px}.rings-lesson .source-card,.rings-lesson .output-socket{min-height:62px;display:grid;place-items:center;border:3px solid var(--gear-layer);border-radius:13px;background:var(--bg);font-weight:850;position:relative}.rings-lesson .output-socket{border-color:var(--multiply-layer)}.rings-lesson .output-socket.collision{border-width:5px;border-style:double;min-height:108px}.rings-lesson .output-socket small{display:block;color:var(--text-muted);font-weight:650}.rings-lesson .fiber-lines{display:grid;gap:30px}.rings-lesson .fiber-line{height:5px;background:var(--multiply-layer);position:relative}.rings-lesson .fiber-line:after{content:"\203a";position:absolute;right:-4px;top:-18px;font-size:30px;color:var(--multiply-layer)}.rings-lesson .fiber-line.merge:first-child{transform:rotate(7deg);transform-origin:right}.rings-lesson .fiber-line.merge:last-child{transform:rotate(-7deg);transform-origin:right}.rings-lesson .cancel-gate{width:min(620px,100%);margin:auto;padding:14px;border:2px dashed var(--border-strong);border-radius:14px;text-align:center}.rings-lesson .cancel-gate.blocked{border-color:#e66b6b}.rings-lesson .cancel-gate.open{border-style:solid;border-color:var(--add-layer)}.rings-lesson .difference-lab{min-height:420px;display:grid;align-content:center;gap:14px}.rings-lesson .difference-rebuild{display:flex;align-items:center;justify-content:center;gap:10px;min-height:84px}.rings-lesson .packet{min-width:84px;min-height:64px;display:grid;place-items:center;border:3px solid var(--add-layer);border-radius:12px;background:var(--bg);font-size:18px;font-weight:850}.rings-lesson .packet.difference{border-color:var(--gear-layer);border-style:dashed}.rings-lesson .packet.zero{border-color:var(--multiply-layer);border-width:5px}.rings-lesson .route-compare{display:grid;grid-template-columns:1fr 1fr;gap:14px}.rings-lesson .difference-route{min-height:120px;padding:14px;border:2px solid var(--border);border-radius:14px;display:grid;align-content:center;gap:8px;text-align:center;opacity:.3}.rings-lesson .difference-route.visible{opacity:1}.rings-lesson .difference-route.whole{border-color:var(--add-layer)}.rings-lesson .difference-route.split{border-color:var(--multiply-layer);border-style:dashed}.rings-lesson .contribution-row{display:flex;justify-content:center;align-items:center;gap:8px}.rings-lesson .world-comparison{min-height:430px;display:grid;grid-template-columns:1fr 1fr;gap:16px}.rings-lesson .map-world{border:2px solid var(--border);border-radius:16px;padding:14px;background:var(--bg);display:grid;grid-template-rows:auto 1fr auto;gap:10px}.rings-lesson .map-world.infinite{border-color:var(--add-layer)}.rings-lesson .map-world.finite{border-color:var(--multiply-layer)}.rings-lesson .world-heading{display:flex;justify-content:space-between;gap:10px;align-items:center}.rings-lesson .map-rows{display:grid;gap:6px;align-content:center}.rings-lesson .map-row{display:grid;grid-template-columns:48px 1fr 58px;gap:8px;align-items:center;padding:5px 8px;border:1px solid var(--border);border-radius:8px}.rings-lesson .map-row .map-arrow{height:3px;background:var(--multiply-layer)}.rings-lesson .map-row.collision{border-color:#e66b6b;border-width:2px}.rings-lesson .map-row.dim{opacity:.28}.rings-lesson .status-pair{display:grid;grid-template-columns:1fr 1fr;gap:8px}.rings-lesson .status-chip{padding:8px;border:1px solid var(--border);border-radius:9px;font-size:11px;font-weight:800}.rings-lesson .status-chip.pass{border-color:var(--add-layer)}.rings-lesson .status-chip.fail{border-color:#e66b6b;border-style:dashed}.rings-lesson .support-lab{min-height:420px;display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:10px;align-items:center}.rings-lesson .function-card{border:3px solid var(--border);border-radius:16px;padding:14px;background:var(--bg)}.rings-lesson .function-card.nonzero{border-color:var(--gear-layer)}.rings-lesson .function-card.zero{border-color:var(--multiply-layer);border-style:double;border-width:5px}.rings-lesson .support-lane{display:grid;grid-template-columns:30px 1fr 44px;gap:8px;align-items:center;padding:8px;margin:6px 0;border:1px solid var(--border);border-radius:9px}.rings-lesson button.support-lane{width:100%;color:inherit;background:var(--bg);font:inherit;text-align:left}.rings-lesson .support-lane.on{border-color:var(--add-layer);background:color-mix(in srgb,var(--add-layer) 9%,transparent)}.rings-lesson .support-lane.overlap{border-color:#e66b6b;border-width:3px}.rings-lesson .support-token{width:18px;height:18px;border:2px solid var(--border-strong);border-radius:50%}.rings-lesson .support-token.on{background:var(--add-layer);border-color:var(--add-layer)}.rings-lesson .translator{min-height:430px;display:grid;align-content:center;gap:15px}.rings-lesson .shared-witness{width:min(520px,100%);margin:auto;padding:12px 18px;border:3px solid var(--gear-layer);border-radius:14px;text-align:center;background:var(--bg)}.rings-lesson .translation-columns{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.rings-lesson .translation-panel{min-height:210px;padding:16px;border:2px dashed var(--border);border-radius:15px;opacity:.28;display:grid;align-content:center;gap:12px}.rings-lesson .translation-panel.revealed{opacity:1;border-style:solid}.rings-lesson .translation-panel.zero-product{border-color:var(--multiply-layer)}.rings-lesson .translation-panel.map-fiber{border-color:var(--gear-layer)}.rings-lesson .translation-panel.cancel-test{border-color:var(--add-layer)}.rings-lesson .translation-expression{padding:14px 8px;border:1px solid var(--border);border-radius:10px;text-align:center;font-family:monospace;font-size:17px;font-weight:800}.rings-lesson .promise-card{border-style:solid;background:color-mix(in srgb,var(--add-layer) 8%,transparent)}.rings-lesson .function-world{min-height:430px;display:grid;align-content:center;gap:14px}.rings-lesson .function-board{display:grid;grid-template-columns:repeat(var(--board-size, 4),minmax(74px,1fr));gap:8px;padding:18px;border:2px solid var(--border);border-radius:18px;background:var(--bg);position:relative}.rings-lesson .function-slot{min-height:66px;padding:7px;display:grid;place-items:center;border:2px solid var(--border);border-radius:11px;background:var(--bg-surface);font-weight:850;position:relative}.rings-lesson button.function-slot{color:inherit;font:inherit}.rings-lesson .function-slot.member{border-color:var(--gear-layer);border-width:4px}.rings-lesson .function-slot.selected{outline:3px solid var(--add-layer);outline-offset:2px}.rings-lesson .function-slot.output{border-color:var(--multiply-layer);border-style:double;border-width:5px}.rings-lesson .function-slot.escape{border-color:#e66b6b;border-style:dashed}.rings-lesson .function-slot.frontier{border-color:var(--add-layer);box-shadow:0 0 0 4px color-mix(in srgb,var(--add-layer) 16%,transparent)}.rings-lesson .lane-mini{display:grid;grid-template-columns:auto auto;gap:4px 8px;font-size:10px;color:var(--text-muted);font-weight:700}.rings-lesson .candidate-label{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:9px 12px;border:2px solid var(--gear-layer);border-radius:12px}.rings-lesson .operation-route{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:9px;align-items:center;text-align:center}.rings-lesson .operation-route .op{width:58px;height:58px;display:grid;place-items:center;border:5px double var(--multiply-layer);border-radius:50%;font-size:21px;font-weight:900}.rings-lesson .membership-gate{padding:12px;border:2px dashed var(--border-strong);border-radius:12px;text-align:center}.rings-lesson .membership-gate.inside{border-color:var(--add-layer);border-style:solid}.rings-lesson .membership-gate.outside{border-color:#e66b6b}.rings-lesson .audit-lab{min-height:430px;display:grid;grid-template-columns:1fr 1fr;gap:16px}.rings-lesson .audit-matrix{display:grid;align-content:center;gap:6px}.rings-lesson .audit-grid{display:grid;grid-template-columns:repeat(var(--audit-size, 5),1fr);gap:5px}.rings-lesson .audit-cell{min-height:42px;display:grid;place-items:center;border:1px dashed var(--border-strong);border-radius:7px;font-size:10px;text-align:center}.rings-lesson .audit-cell.pass{border-style:solid;border-color:var(--add-layer)}.rings-lesson .audit-cell.fail{border-style:solid;border-color:#e66b6b;background:color-mix(in srgb,#e66b6b 8%,transparent)}.rings-lesson .audit-cell.untested{opacity:.35}.rings-lesson .contract-lab{min-height:420px;display:grid;grid-template-columns:1fr 1fr;gap:18px}.rings-lesson .law-module,.rings-lesson .port-module{border:2px solid var(--border);border-radius:17px;padding:16px;display:grid;align-content:center;gap:10px}.rings-lesson .law-module{border-color:var(--add-layer);background:color-mix(in srgb,var(--add-layer) 5%,transparent)}.rings-lesson .law-seal{padding:11px;border:1px solid var(--add-layer);border-radius:9px;display:flex;justify-content:space-between;gap:8px}.rings-lesson .autonomy-port{width:100%;padding:13px;border:2px dashed var(--gear-layer);border-radius:11px;background:var(--bg);color:inherit;text-align:left}.rings-lesson .autonomy-port.checked{border-style:solid;background:color-mix(in srgb,var(--gear-layer) 8%,transparent)}.rings-lesson .port-result{display:block;margin-top:4px;color:var(--text-muted)}.rings-lesson .identity-lab{min-height:420px;display:grid;grid-template-columns:1fr 220px;gap:18px}.rings-lesson .identity-docks{display:grid;align-content:center;gap:16px}.rings-lesson .identity-card{padding:15px;border:3px solid var(--border);border-radius:13px;text-align:center;background:var(--bg)}.rings-lesson .identity-card.ambient{border-color:var(--multiply-layer);border-width:5px}.rings-lesson .identity-card.internal{border-color:var(--gear-layer);border-style:dashed}.rings-lesson .identity-card.outside{opacity:.42}.rings-lesson .generation-lab{min-height:440px;display:grid;grid-template-columns:1fr 300px;gap:16px}.rings-lesson .generation-history{border-left:1px solid var(--border);padding-left:14px;display:grid;align-content:start;gap:7px;max-height:430px;overflow:auto}.rings-lesson .reason-tag{padding:9px;border:1px solid var(--border);border-radius:9px;font-size:11px}.rings-lesson .reason-tag.latest{border-color:var(--add-layer)}.rings-lesson .fixed-point{padding:12px;border:3px double var(--add-layer);border-radius:12px;text-align:center;font-weight:850}.rings-lesson .map-convention{display:inline-flex;align-items:center;gap:7px;padding:6px 10px;border:1px solid var(--gear-layer);border-radius:999px;font-size:10px;font-weight:850;letter-spacing:.06em}.rings-lesson .map-bridge-lab{min-height:430px;display:grid;grid-template-columns:minmax(0,1.15fr) 150px minmax(0,.85fr);gap:16px;align-items:stretch}.rings-lesson .map-world-panel{border:2px solid var(--border);border-radius:17px;padding:15px;background:var(--bg);display:grid;align-content:center;gap:12px}.rings-lesson .map-world-panel.source{border-color:var(--add-layer)}.rings-lesson .map-world-panel.target{border-color:var(--multiply-layer)}.rings-lesson .world-cap{display:flex;justify-content:space-between;gap:12px;align-items:center;font-size:11px;color:var(--text-muted);font-weight:800}.rings-lesson .map-inputs{display:grid;grid-template-columns:1fr 1fr;gap:9px}.rings-lesson .map-function-card{padding:11px;border:2px solid var(--border);border-radius:12px;background:var(--bg-surface);display:grid;gap:7px}.rings-lesson .map-function-card.result{border-color:var(--gear-layer)}.rings-lesson .map-function-card .mini-lane{display:grid;grid-template-columns:22px 1fr auto auto;gap:5px;align-items:center;padding:5px;border:1px solid var(--border);border-radius:8px}.rings-lesson .map-function-card .mini-lane.observed{border-color:var(--add-layer);background:color-mix(in srgb,var(--add-layer) 8%,transparent)}.rings-lesson .map-function-card button{min-width:36px;min-height:36px;padding:1px 7px}.rings-lesson .bridge-column{display:grid;align-content:center;gap:12px;text-align:center}.rings-lesson .phi-bridge{min-height:72px;padding:12px 7px;border:3px solid var(--gear-layer);border-radius:16px;background:color-mix(in srgb,var(--gear-layer) 8%,var(--bg));display:grid;place-items:center;font-weight:900}.rings-lesson .route-step{padding:9px;border:1px dashed var(--border-strong);border-radius:10px;font-size:11px;color:var(--text-muted)}.rings-lesson .route-step.active{border-style:solid;border-color:var(--add-layer);color:var(--text)}.rings-lesson .route-step.multiply.active{border-color:var(--multiply-layer);border-style:double;border-width:4px}.rings-lesson .endpoint-dock{min-height:86px;padding:12px;border:3px solid var(--border);border-radius:13px;display:grid;place-items:center;text-align:center}.rings-lesson .endpoint-dock.matched{border-color:var(--add-layer)}.rings-lesson .endpoint-dock.mismatch{border-color:#e66b6b;border-style:dashed}.rings-lesson .endpoint-dock strong{display:block;font-size:24px}.rings-lesson .route-equations{display:grid;gap:9px}.rings-lesson .route-equation{padding:10px;border:1px solid var(--border);border-radius:9px;font-family:monospace;font-weight:750}.rings-lesson .route-equation.upper{border-left:5px solid var(--add-layer)}.rings-lesson .route-equation.lower{border-left:5px double var(--multiply-layer)}.rings-lesson .dual-contract-lab{min-height:430px;display:grid;grid-template-columns:230px minmax(0,1fr);gap:16px}.rings-lesson .candidate-map-list{display:grid;align-content:center;gap:10px}.rings-lesson .candidate-map-list button{text-align:left;min-height:76px}.rings-lesson .candidate-map-list small{display:block;margin-top:5px;color:var(--text-muted)}.rings-lesson .contract-auditor{display:grid;grid-template-columns:1fr 1fr;gap:13px;align-content:center}.rings-lesson .contract-rail{min-height:270px;padding:16px;border:3px solid var(--border);border-radius:16px;display:grid;align-content:center;gap:12px}.rings-lesson .contract-rail.add{border-color:var(--add-layer)}.rings-lesson .contract-rail.multiply{border-color:var(--multiply-layer);border-style:double;border-width:6px}.rings-lesson .contract-status{padding:8px;border:1px solid var(--border);border-radius:9px;font-size:11px;font-weight:850}.rings-lesson .contract-status.pass{border-color:var(--add-layer)}.rings-lesson .contract-status.fail{border-color:#e66b6b;border-style:dashed}.rings-lesson .contract-status.unknown{opacity:.45}.rings-lesson .witness-endpoints{display:grid;grid-template-columns:1fr auto 1fr;gap:7px;align-items:center;text-align:center}.rings-lesson .witness-endpoints span{padding:9px;border:1px solid var(--border);border-radius:9px;font-weight:800}.rings-lesson .witness-endpoints.fail span{border-color:#e66b6b}.rings-lesson .identity-gate-lab{min-height:420px;display:grid;grid-template-columns:1fr 260px;gap:18px}.rings-lesson .sealed-contracts{display:grid;grid-template-columns:1fr 1fr;gap:12px;align-content:center}.rings-lesson .contract-seal{min-height:130px;padding:16px;border:3px solid var(--border);border-radius:16px;display:grid;place-items:center;text-align:center;opacity:.35}.rings-lesson .contract-seal.passed{opacity:1;border-color:var(--add-layer)}.rings-lesson .contract-seal.multiply.passed{border-color:var(--multiply-layer);border-style:double;border-width:6px}.rings-lesson .identity-flight{grid-column:1/-1;display:grid;grid-template-columns:110px 1fr 110px;gap:12px;align-items:center;padding:16px;border:2px dashed var(--gear-layer);border-radius:15px}.rings-lesson .identity-beacon,.rings-lesson .identity-target{min-height:72px;display:grid;place-items:center;border:3px solid var(--gear-layer);border-radius:50%;font-size:22px;font-weight:900}.rings-lesson .identity-target.fail{border-color:#e66b6b;border-style:dashed}.rings-lesson .identity-flight-line{height:5px;background:var(--gear-layer);position:relative}.rings-lesson .identity-flight-line:after{content:"\203a";position:absolute;right:-3px;top:-18px;font-size:30px}.rings-lesson .zero-fiber-lab{min-height:440px;display:grid;grid-template-columns:minmax(0,1fr) 180px minmax(0,.7fr);gap:15px;align-items:center}.rings-lesson .collision-cards{display:grid;gap:11px}.rings-lesson .collision-card{padding:13px;border:3px solid var(--add-layer);border-radius:13px;background:var(--bg)}.rings-lesson .collision-card.dim{opacity:.35}.rings-lesson .difference-packet-map{padding:14px;border:3px dashed var(--gear-layer);border-radius:13px;text-align:center;font-weight:850}.rings-lesson .difference-packet-map.active{background:color-mix(in srgb,var(--gear-layer) 10%,var(--bg))}.rings-lesson .fiber-bridge{display:grid;gap:10px;text-align:center}.rings-lesson .fiber-arrow{height:5px;background:var(--multiply-layer);position:relative}.rings-lesson .fiber-arrow:after{content:"\203a";position:absolute;right:-3px;top:-18px;font-size:30px;color:var(--multiply-layer)}.rings-lesson .target-fiber{display:grid;gap:12px}.rings-lesson .target-fiber .target-node{min-height:72px;padding:12px;border:3px solid var(--border);border-radius:14px;display:grid;place-items:center;text-align:center}.rings-lesson .target-fiber .target-node.active{border-color:var(--multiply-layer)}.rings-lesson .target-fiber .target-node.zero{border-style:double;border-width:6px}.rings-lesson .next-question{margin-top:14px;padding:13px;border:2px dashed var(--multiply-layer);border-radius:12px;text-align:center}.rings-lesson .kernel-shell{border:3px solid var(--gear-layer);border-radius:18px;padding:14px;position:relative;background:color-mix(in srgb,var(--gear-layer) 5%,var(--bg))}.rings-lesson .kernel-shell:before{content:"KER \3c6  \b7  ZERO-OUTPUT FIBER";position:absolute;top:-12px;left:16px;padding:3px 9px;background:var(--bg-surface);color:var(--gear-layer);font-size:10px;font-weight:900;letter-spacing:.08em}.rings-lesson .fiber-scanner{min-height:440px;display:grid;grid-template-columns:minmax(0,1fr) 150px 250px;gap:16px;align-items:center}.rings-lesson .fiber-source{display:grid;grid-template-columns:repeat(4,minmax(65px,1fr));gap:8px;padding:14px;border:2px solid var(--border);border-radius:17px;background:var(--bg)}.rings-lesson .fiber-source.integer{grid-template-columns:repeat(5,minmax(52px,1fr))}.rings-lesson .fiber-card{min-height:62px;padding:7px;border:2px solid var(--border);border-radius:10px;background:var(--bg-surface);display:grid;place-items:center;text-align:center;opacity:.34}.rings-lesson button.fiber-card{color:inherit;font:inherit}.rings-lesson .fiber-card.lit{opacity:1;border-color:var(--add-layer)}.rings-lesson .fiber-card.kernel{border-color:var(--gear-layer);border-width:4px}.rings-lesson .fiber-card strong{font-size:16px}.rings-lesson .fiber-card small{color:var(--text-muted)}.rings-lesson .target-docks{display:grid;gap:8px}.rings-lesson .target-dock{min-height:64px;padding:9px;border:2px solid var(--border);border-radius:11px;text-align:center;display:grid;place-items:center}.rings-lesson button.target-dock{color:inherit;font:inherit}.rings-lesson .target-dock.active{border-color:var(--multiply-layer);border-width:4px}.rings-lesson .target-dock.zero{border-style:double;border-width:5px}.rings-lesson .fiber-summary{padding:14px;border:2px solid var(--border);border-radius:14px;display:grid;gap:10px}.rings-lesson .fiber-arrow-stack{display:grid;align-content:center;gap:12px;text-align:center}.rings-lesson .fiber-trace{height:5px;background:var(--gear-layer);position:relative}.rings-lesson .fiber-trace:after{content:"\203a";position:absolute;right:-3px;top:-18px;font-size:30px}.rings-lesson .callback-strip{margin-top:12px;padding:10px 13px;border:1px dashed var(--border-strong);border-radius:11px;display:flex;justify-content:center;gap:12px;align-items:center;color:var(--text-muted);font-size:12px}.rings-lesson .kernel-difference-lab{min-height:430px;display:grid;grid-template-columns:minmax(0,1fr) 170px 250px;gap:16px;align-items:center}.rings-lesson .kernel-members{display:grid;grid-template-columns:1fr 1fr;gap:12px}.rings-lesson .kernel-member{padding:14px;border:3px solid var(--gear-layer);border-radius:14px;background:var(--bg);display:grid;gap:9px;text-align:center}.rings-lesson .kernel-member.output{grid-column:1/-1;border-color:var(--add-layer)}.rings-lesson .value-selector{display:flex;justify-content:center;gap:6px;flex-wrap:wrap}.rings-lesson .value-selector button{min-height:30px;padding:2px 9px}.rings-lesson .difference-port-large{min-height:100px;padding:13px;border:4px solid var(--add-layer);border-radius:50%;display:grid;place-items:center;text-align:center;font-weight:900}.rings-lesson .target-proof{display:grid;gap:10px}.rings-lesson .proof-stage{padding:11px;border:2px dashed var(--border);border-radius:10px;opacity:.35}.rings-lesson .proof-stage.active{opacity:1;border-style:solid;border-color:var(--add-layer)}.rings-lesson .assumption-card{margin-top:13px;padding:12px;border:2px dashed var(--border-strong);border-radius:12px}.rings-lesson .absorption-lab{min-height:440px;display:grid;grid-template-columns:220px 150px minmax(0,1fr);gap:16px;align-items:center}.rings-lesson .ambient-zone{min-height:350px;padding:18px;border:2px solid var(--border);border-radius:18px;background:var(--bg);display:grid;align-content:center;gap:16px;position:relative}.rings-lesson .ambient-zone:before{content:"AMBIENT R";position:absolute;top:10px;left:12px;color:var(--text-muted);font-size:10px;font-weight:900}.rings-lesson .role-card{padding:13px;border:3px solid var(--border);border-radius:13px;background:var(--bg-surface);display:grid;gap:5px;text-align:center}.rings-lesson .role-card.ambient{border-color:var(--multiply-layer)}.rings-lesson .role-card.inside{border-color:var(--gear-layer)}.rings-lesson .role-card.product{border-color:var(--add-layer)}.rings-lesson .ambient-action-port{min-height:112px;padding:12px;border:6px double var(--multiply-layer);border-radius:50%;display:grid;place-items:center;text-align:center;font-weight:900}.rings-lesson .product-zone{display:grid;gap:13px}.rings-lesson .dual-status{display:grid;grid-template-columns:1fr 1fr;gap:9px}.rings-lesson .semantic-status{min-height:64px;padding:10px;border:2px solid var(--border);border-radius:11px;display:grid;place-items:center;text-align:center;font-size:11px;font-weight:850}.rings-lesson .semantic-status.true{border-color:var(--add-layer)}.rings-lesson .semantic-status.false{border-color:#e6b35d;border-style:dashed}.rings-lesson .target-zero-reason{padding:12px;border:2px solid var(--gear-layer);border-radius:11px;font-family:monospace;font-weight:800;text-align:center}.rings-lesson .ideal-contract-lab{min-height:430px;display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:18px}.rings-lesson .ideal-boundary{border:4px solid var(--gear-layer);border-radius:20px;padding:20px;display:grid;grid-template-columns:1fr 1fr;gap:15px;align-content:center;position:relative;background:color-mix(in srgb,var(--gear-layer) 5%,var(--bg))}.rings-lesson .ideal-boundary:before{content:"CANDIDATE BOUNDARY I";position:absolute;top:10px;left:16px;font-size:10px;font-weight:900;color:var(--gear-layer)}.rings-lesson .ideal-port{min-height:190px;padding:17px;border:4px solid var(--border);border-radius:17px;display:grid;align-content:center;gap:10px;opacity:.38}.rings-lesson button.ideal-port{color:inherit;text-align:left;font:inherit}.rings-lesson .ideal-port.active,.rings-lesson .ideal-port.checked{opacity:1;border-color:var(--add-layer)}.rings-lesson .ideal-port.ambient{border-style:double;border-width:7px}.rings-lesson .ideal-port.ambient.active,.rings-lesson .ideal-port.ambient.checked{border-color:var(--multiply-layer)}.rings-lesson .identity-outside{grid-column:1/-1;padding:10px;border:2px dashed var(--border-strong);border-radius:11px;text-align:center;color:var(--text-muted)}.rings-lesson .contract-ledger{display:grid;align-content:center;gap:11px}.rings-lesson .contract-line{padding:12px;border:2px solid var(--border);border-radius:11px}.rings-lesson .contract-line.checked{border-color:var(--add-layer)}.rings-lesson .ideal-nameplate{padding:15px;border:5px double var(--gear-layer);border-radius:14px;text-align:center;font-weight:900;font-size:20px}.rings-lesson .contract-scope-lab{min-height:430px;display:grid;grid-template-columns:1fr 1fr;gap:18px}.rings-lesson .scope-panel{border:3px solid var(--border);border-radius:18px;padding:18px;display:grid;align-content:center;gap:14px;opacity:.55}.rings-lesson .scope-panel.active{opacity:1;border-color:var(--add-layer)}.rings-lesson .scope-panel.ideal.active{border-color:var(--multiply-layer);border-style:double;border-width:7px}.rings-lesson .scope-boundary{min-height:210px;border:3px solid var(--gear-layer);border-radius:17px;padding:18px;display:grid;align-content:center;gap:13px;position:relative;background:color-mix(in srgb,var(--gear-layer) 5%,var(--bg))}.rings-lesson 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button.distractor{border-style:dashed}.rings-ch16-lesson .reason-tile-bank button:disabled{opacity:.35}.rings-ch16-lesson .assembly-feedback{margin:0 0 14px;padding:10px 14px;border:4px double var(--ch16-growth);border-radius:10px;background:var(--bg-surface)}.rings-ch16-lesson .assembly-feedback.warning{border-style:dashed;border-color:var(--ch16-blocked)}.rings-ch16-lesson .quantifier-bridge-lab{grid-template-columns:minmax(230px,.72fr) minmax(430px,1.25fr) minmax(230px,.72fr);align-items:center}.rings-ch16-lesson .bridge-endpoint{min-height:300px;padding:16px;border:6px double var(--ch16-growth);border-radius:16px;background:var(--bg);display:grid;place-items:center;gap:8px;text-align:center}.rings-ch16-lesson .field-endpoint{border-color:var(--ch16-inverse)}.rings-ch16-lesson .bridge-endpoint strong{font-size:25px}.rings-ch16-lesson .bridge-endpoint span{color:var(--text-secondary);font-size:12px}.rings-ch16-lesson .bridge-endpoint b{font-size:10px}.rings-ch16-lesson .bridge-reasons{display:grid;gap:11px}.rings-ch16-lesson .bridge-reasons>div{min-height:86px;padding:10px 14px;border:4px dashed var(--border-strong);border-radius:12px;background:var(--bg-surface);display:grid;grid-template-columns:42px 1fr;gap:4px 12px;align-items:center;opacity:.42}.rings-ch16-lesson .bridge-reasons>div.connected{border:6px double var(--ch16-identity);opacity:1}.rings-ch16-lesson .bridge-reasons>div>span{grid-row:1/3;font-size:25px;font-weight:900;text-align:center}.rings-ch16-lesson .general-theorem-seal{grid-column:1/-1;padding:15px;border:8px double var(--ch16-inverse);border-radius:15px;background:var(--bg-surface);display:grid;place-items:center;gap:5px;text-align:center}.rings-ch16-lesson .general-theorem-seal strong{font-size:22px}.rings-ch16-lesson .general-theorem-seal span{color:var(--text-secondary);font-size:9px}@media(max-width:1350px){.rings-ch16-lesson .dock-workbench{grid-template-columns:155px 180px minmax(220px,1fr) 190px}.rings-ch16-lesson .growth-main-row{grid-template-columns:minmax(500px,1.25fr) minmax(270px,.75fr)}.rings-ch16-lesson .reason-tile-bank{grid-template-columns:repeat(4,1fr) 76px}}@media(prefers-reduced-motion:reduce){.rings-ch16-lesson .dock-column button,.rings-ch16-lesson .product-route,.rings-ch16-lesson .identity-dock,.rings-ch16-lesson .aligned-token,.rings-ch16-lesson .wrap-axis,.rings-ch16-lesson .growth-board span,.rings-ch16-lesson .fork-node,.rings-ch16-lesson .fork-middle div,.rings-ch16-lesson .fiber-card-grid span,.rings-ch16-lesson .fiber-sleeve,.rings-ch16-lesson .handle-comparison>div,.rings-ch16-lesson .bridge-reasons>div{transition:none!important;animation:none!important}}.rings-ch17-lesson{--ch17-inside: var(--multiply-layer);--ch17-outside: var(--gear-layer);--ch17-safe: var(--add-layer);--ch17-breach: #a34f45}.rings-ch17-lesson button:focus-visible{outline:4px solid var(--accent);outline-offset:3px}.rings-ch17-lesson .product-trace-lab,.rings-ch17-lesson .prime-sensor-lab,.rings-ch17-lesson .witness-transporter-lab,.rings-ch17-lesson .inverse-rescue-lab,.rings-ch17-lesson .strictness-lab{min-height:560px;display:grid;gap:16px;align-content:center}.rings-ch17-lesson .trace-worlds{display:grid;grid-template-columns:1fr 64px 1fr;gap:14px;align-items:stretch}.rings-ch17-lesson .trace-world{min-height:330px;padding:18px;border:3px solid var(--border);border-radius:16px;background:var(--bg);display:grid;grid-template-rows:auto 1fr auto;gap:16px}.rings-ch17-lesson .trace-world.active{border:6px double var(--ch17-outside)}.rings-ch17-lesson .trace-heading{display:flex;justify-content:space-between;gap:12px;align-items:center}.rings-ch17-lesson .trace-heading small,.rings-ch17-lesson .sensor-card small,.rings-ch17-lesson .packet small,.rings-ch17-lesson .rescue-step small,.rings-ch17-lesson .contract-panel small,.rings-ch17-lesson .ideal-chain small{color:var(--text-muted);font-size:8px;font-weight:900;letter-spacing:.06em}.rings-ch17-lesson .trace-equation{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:10px;align-items:center;text-align:center}.rings-ch17-lesson .trace-card{min-height:92px;padding:10px;border:3px solid var(--ch17-outside);border-radius:12px;background:var(--bg-surface);display:grid;place-items:center;gap:3px}.rings-ch17-lesson .trace-card.product{border-color:var(--ch17-inside)}.rings-ch17-lesson .trace-card.zero{border:6px double var(--ch17-breach);background-image:repeating-linear-gradient(135deg,transparent 0 8px,color-mix(in srgb,var(--ch17-breach) 14%,transparent) 8px 12px)}.rings-ch17-lesson .trace-card span,.rings-ch17-lesson .trace-result span{color:var(--text-secondary);font-size:9px}.rings-ch17-lesson .trace-arrow{font-size:24px;font-weight:900}.rings-ch17-lesson .trace-result{padding:12px;border:3px dashed var(--border-strong);border-radius:12px;display:grid;gap:4px;text-align:center}.rings-ch17-lesson .trace-result.crash{border:6px double var(--ch17-breach)}.rings-ch17-lesson .boundary-switch{display:grid;place-items:center;font-size:28px;font-weight:900;color:var(--text-muted)}.rings-ch17-lesson .sensor-rig{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.rings-ch17-lesson .sensor-card{min-height:150px;padding:14px;border:3px dashed var(--border);border-radius:14px;background:var(--bg-surface);display:grid;place-items:center;gap:7px;text-align:center}.rings-ch17-lesson .sensor-card.on{border:6px double var(--ch17-outside)}.rings-ch17-lesson .sensor-card.inside.on{border-color:var(--ch17-inside)}.rings-ch17-lesson .sensor-card strong{font-size:20px}.rings-ch17-lesson .breach-gate{min-height:100px;padding:15px;border:4px dashed var(--border-strong);border-radius:14px;display:grid;place-items:center;gap:4px;text-align:center}.rings-ch17-lesson .breach-gate.breach{border:7px double var(--ch17-breach);background:color-mix(in srgb,var(--ch17-breach) 8%,var(--bg))}.rings-ch17-lesson .breach-gate.safe{border:5px double var(--ch17-safe)}.rings-ch17-lesson .pair-purpose-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.rings-ch17-lesson .pair-purpose-grid>div{padding:10px;border:2px solid var(--border);border-radius:10px;background:var(--bg-surface);display:grid;gap:3px;text-align:center}.rings-ch17-lesson .transport-track{display:grid;grid-template-columns:1fr 100px 1fr;gap:14px;align-items:center}.rings-ch17-lesson .witness-packet{min-height:330px;padding:18px;border:5px double var(--ch17-breach);border-radius:16px;background:var(--bg);display:grid;align-content:center;gap:10px}.rings-ch17-lesson .witness-packet.downstairs{border-color:var(--ch17-inside)}.rings-ch17-lesson .packet{min-height:70px;padding:10px;border:3px solid var(--border);border-radius:10px;background:var(--bg-surface);display:grid;place-items:center;gap:3px;text-align:center;opacity:.28}.rings-ch17-lesson .packet.revealed{opacity:1;border-color:var(--ch17-outside)}.rings-ch17-lesson .packet.product.revealed{border-color:var(--ch17-breach);border-style:double;border-width:5px}.rings-ch17-lesson .projection-gate{display:grid;place-items:center;gap:8px;text-align:center}.rings-ch17-lesson .projection-gate strong{width:70px;height:70px;border:6px double var(--ch17-outside);border-radius:50%;display:grid;place-items:center;font-size:24px}.rings-ch17-lesson .projection-gate span{font-size:9px;color:var(--text-secondary)}.rings-ch17-lesson .theorem-seal{padding:15px;border:6px double var(--ch17-safe);border-radius:14px;background:var(--bg-surface);display:grid;place-items:center;gap:4px;text-align:center}.rings-ch17-lesson .rescue-equation{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;align-items:stretch}.rings-ch17-lesson .rescue-step{min-height:190px;padding:14px;border:3px dashed var(--border);border-radius:14px;background:var(--bg-surface);display:grid;place-items:center;gap:7px;text-align:center;opacity:.25}.rings-ch17-lesson .rescue-step.visible{opacity:1;border:5px double var(--ch17-outside)}.rings-ch17-lesson .rescue-step:last-child.visible{border-color:var(--ch17-safe)}.rings-ch17-lesson .rescue-step strong{font-size:20px}.rings-ch17-lesson .correspondence-chain{display:grid;grid-template-columns:1fr 70px 1fr;grid-template-rows:auto auto;gap:10px;align-items:center}.rings-ch17-lesson .correspondence-chain>div:not(.chain-arrow){min-height:86px;padding:11px;border:3px solid var(--border);border-radius:11px;background:var(--bg-surface);display:grid;place-items:center;gap:3px;text-align:center}.rings-ch17-lesson .chain-arrow{text-align:center;font-size:22px;font-weight:900}.rings-ch17-lesson .chain-result{grid-column:1/-1;border:6px double var(--ch17-safe)!important}.rings-ch17-lesson .contract-comparison{display:grid;grid-template-columns:1fr 70px 1fr;gap:14px;align-items:stretch}.rings-ch17-lesson .contract-panel{min-height:330px;padding:18px;border:5px double var(--ch17-safe);border-radius:16px;background:var(--bg);display:grid;align-content:center;gap:12px}.rings-ch17-lesson .contract-panel.field{border:4px dashed var(--ch17-breach)}.rings-ch17-lesson .contract-test{min-height:75px;padding:10px;border:3px solid var(--border);border-radius:11px;background:var(--bg-surface);display:grid;place-items:center;gap:3px;text-align:center}.rings-ch17-lesson .contract-test.pass{border-color:var(--ch17-safe);border-style:double;border-width:5px}.rings-ch17-lesson .contract-test.fail{border-color:var(--ch17-breach);border-style:dashed;border-width:4px}.rings-ch17-lesson .ideal-chain{display:grid;gap:8px;align-content:center;text-align:center}.rings-ch17-lesson .ideal-chain span{padding:11px;border:3px solid var(--border);border-radius:10px;background:var(--bg-surface);font-weight:850}.rings-ch17-lesson .ideal-chain b{font-size:22px}.rings-ch17-lesson .scope-correction{padding:12px;border:3px dashed var(--border-strong);border-radius:12px;background:var(--bg-surface);display:grid;gap:4px;text-align:center}@media(prefers-reduced-motion:reduce){.rings-ch17-lesson *{scroll-behavior:auto!important;transition:none!important;animation:none!important}}.rings-ch18-lesson{--ch18-route: var(--gear-layer);--ch18-keep: var(--add-layer);--ch18-test: var(--multiply-layer);--ch18-fail: #a34f45}.rings-ch18-lesson button:focus-visible{outline:4px solid var(--accent);outline-offset:3px}.rings-ch18-lesson .diagnosis-lab,.rings-ch18-lesson .relation-compiler-lab,.rings-ch18-lesson .fiber-containment-lab,.rings-ch18-lesson .image-target-lab,.rings-ch18-lesson .paired-gates-lab,.rings-ch18-lesson .behavior-router-lab{min-height:560px;display:grid;gap:15px;align-content:center}.rings-ch18-lesson .mini-label{color:var(--text-muted);font-size:8px;font-weight:900;letter-spacing:.06em}.rings-ch18-lesson .boundary-switch{display:flex;justify-content:center;gap:8px;flex-wrap:wrap}.rings-ch18-lesson .boundary-switch button{min-height:42px;padding:8px 13px;border:3px solid var(--border);border-radius:9px;background:var(--bg-surface);color:inherit;font:inherit;font-size:9px;font-weight:900}.rings-ch18-lesson .boundary-switch button.active{border:5px double var(--ch18-route);background:color-mix(in srgb,var(--ch18-route) 8%,var(--bg-surface))}.rings-ch18-lesson .prediction-note{padding:11px 14px;border:3px dashed var(--border-strong);border-radius:11px;background:var(--bg-surface);text-align:center;font-weight:800}.rings-ch18-lesson .diagnosis-card{min-height:120px;padding:18px;border:5px double var(--ch18-route);border-radius:16px;background:var(--bg);display:grid;place-items:center;gap:8px;text-align:center}.rings-ch18-lesson .diagnosis-card strong{font-size:22px;max-width:720px}.rings-ch18-lesson .diagnosis-interview{display:grid;grid-template-columns:1fr 80px 1fr;gap:12px;align-items:stretch}.rings-ch18-lesson .diagnosis-question,.rings-ch18-lesson .diagnosis-answer{min-height:230px;padding:18px;border:3px dashed var(--border-strong);border-radius:15px;background:var(--bg-surface);display:grid;align-content:center;gap:12px;text-align:center}.rings-ch18-lesson .diagnosis-answer.revealed{border:6px double var(--ch18-keep)}.rings-ch18-lesson .diagnosis-arrow{display:grid;place-items:center;font-size:28px;font-weight:900}.rings-ch18-lesson .route-map-strip{display:grid;grid-template-columns:repeat(6,1fr);gap:7px}.rings-ch18-lesson .route-map-strip>div{min-height:76px;padding:8px;border:2px solid var(--border);border-radius:9px;background:var(--bg-surface);display:grid;place-items:center;text-align:center;opacity:.24;font-size:8px;font-weight:850}.rings-ch18-lesson .route-map-strip>div.active{opacity:1;border:5px double var(--ch18-route)}.rings-ch18-lesson .compiler-track{display:grid;grid-template-columns:1fr 55px 1fr 55px 1fr 55px 1fr;gap:8px;align-items:center}.rings-ch18-lesson .compiler-stage{min-height:180px;padding:14px;border:3px dashed var(--border);border-radius:14px;background:var(--bg-surface);display:grid;place-items:center;gap:7px;text-align:center;opacity:.25}.rings-ch18-lesson .compiler-stage.visible{opacity:1;border:5px double var(--ch18-route)}.rings-ch18-lesson .compiler-stage:last-child.visible{border-color:var(--ch18-keep)}.rings-ch18-lesson .compiler-stage strong{font-size:20px}.rings-ch18-lesson .compiler-arrow{text-align:center;font-size:24px;font-weight:900}.rings-ch18-lesson .ideal-viewport{display:flex;justify-content:center;gap:7px;flex-wrap:wrap}.rings-ch18-lesson .ideal-viewport span{min-width:45px;padding:7px;border:2px solid var(--ch18-test);border-radius:8px}.rings-ch18-lesson .fiber-comparison{display:grid;grid-template-columns:1fr 70px 1fr;gap:14px;align-items:stretch}.rings-ch18-lesson .fiber-world{min-height:360px;padding:18px;border:4px solid var(--border);border-radius:16px;background:var(--bg);display:grid;align-content:center;gap:13px}.rings-ch18-lesson .fiber-world.active{border:6px double var(--ch18-route)}.rings-ch18-lesson .fiber-sleeve18{padding:12px;border:4px dashed var(--border-strong);border-radius:13px;display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.rings-ch18-lesson .fiber-handle18{min-height:76px;border:3px solid var(--ch18-test);border-radius:10px;background:var(--bg-surface);display:grid;place-items:center;gap:3px;text-align:center}.rings-ch18-lesson .fiber-output-row{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.rings-ch18-lesson .fiber-output-row span{padding:10px;border:3px solid var(--border);border-radius:9px;text-align:center;font-weight:850}.rings-ch18-lesson .fiber-world.safe .fiber-output-row span{border-color:var(--ch18-keep)}.rings-ch18-lesson .fiber-world.blocked .fiber-output-row span{border-color:var(--ch18-fail);border-style:dashed}.rings-ch18-lesson .descent-verdict{padding:12px;border:5px double var(--ch18-keep);border-radius:12px;text-align:center}.rings-ch18-lesson .descent-verdict.blocked{border-color:var(--ch18-fail);border-style:dashed}.rings-ch18-lesson .image-route{display:grid;grid-template-columns:260px 80px 1fr;gap:14px;align-items:center}.rings-ch18-lesson .image-inputs{display:grid;gap:8px}.rings-ch18-lesson .image-inputs button{min-height:58px;border:3px solid var(--border);border-radius:9px;background:var(--bg-surface);color:inherit;font:inherit;display:grid;place-items:center}.rings-ch18-lesson .image-inputs button.routed{border:5px double var(--ch18-route)}.rings-ch18-lesson .delta-machine{display:grid;place-items:center;gap:6px;text-align:center}.rings-ch18-lesson .delta-machine strong{width:62px;height:62px;border:5px double var(--ch18-route);border-radius:50%;display:grid;place-items:center;font-size:22px}.rings-ch18-lesson .target-grid18{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.rings-ch18-lesson .target-cell18{min-height:68px;border:3px dashed var(--border);border-radius:9px;background:var(--bg-surface);display:grid;place-items:center;gap:2px;opacity:.35}.rings-ch18-lesson .target-cell18.reachable{opacity:1;border:5px double var(--ch18-keep)}.rings-ch18-lesson .target-cell18.lit{background:color-mix(in srgb,var(--ch18-keep) 10%,var(--bg))}.rings-ch18-lesson .image-ledger{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.rings-ch18-lesson .image-ledger>div{padding:11px;border:3px solid var(--border);border-radius:10px;background:var(--bg-surface);display:grid;place-items:center;gap:3px;text-align:center}.rings-ch18-lesson .paired-layout{display:grid;grid-template-columns:260px 1fr;gap:14px;align-items:stretch}.rings-ch18-lesson .gate-stack{display:grid;gap:12px;align-content:center}.rings-ch18-lesson .logic-gate18{min-height:135px;padding:14px;border:4px dashed var(--border-strong);border-radius:14px;background:var(--bg-surface);display:grid;place-items:center;gap:5px;text-align:center;opacity:.3}.rings-ch18-lesson .logic-gate18.visible{opacity:1}.rings-ch18-lesson .logic-gate18.pass{border:6px double var(--ch18-keep)}.rings-ch18-lesson .logic-gate18.fail{border:5px dashed var(--ch18-fail)}.rings-ch18-lesson .address-grid18{display:grid;gap:7px;align-content:center}.rings-ch18-lesson .address-cell18{min-height:52px;border:3px dashed var(--border);border-radius:8px;background:var(--bg-surface);display:grid;place-items:center;opacity:.28}.rings-ch18-lesson .address-cell18.reachable{opacity:1;border:4px double var(--ch18-route)}.rings-ch18-lesson .address-cell18.missing{border-color:var(--ch18-fail)}.rings-ch18-lesson .requirement-card18{padding:16px;border:5px double var(--ch18-route);border-radius:15px;background:var(--bg);display:grid;place-items:center;gap:6px;text-align:center}.rings-ch18-lesson .detector-choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.rings-ch18-lesson .detector-card18{min-height:165px;padding:15px;border:3px dashed var(--border);border-radius:14px;background:var(--bg-surface);display:grid;place-items:center;gap:7px;text-align:center;opacity:.45}.rings-ch18-lesson .detector-card18.selected{opacity:1;border:6px double var(--ch18-route)}.rings-ch18-lesson .boundary-ledger18{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.rings-ch18-lesson .boundary-ledger18>div{padding:12px;border:3px solid var(--border);border-radius:11px;background:var(--bg-surface);display:grid;place-items:center;gap:4px;text-align:center}.rings-ch18-lesson .boundary-ledger18>div.active{border:6px double var(--ch18-keep)}.rings-ch18-lesson .final-route-map{display:grid;grid-template-columns:1fr 1fr;gap:10px}.rings-ch18-lesson .final-route-map>div{padding:12px;border:3px solid 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