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minmax(0,1fr);gap:20px}.fh:not(.fh-ready) .fh-discovery-grid{display:block}.fh-stage-list{display:grid;gap:6px}.fh-stage-button{display:flex;text-align:left;align-items:center;gap:12px;width:100%;background:var(--fh-paper);border:1px solid var(--fh-line);color:var(--fh-ink);padding:11px 14px;border-radius:9px;font-size:.87rem;font-weight:700}.fh-number,.fh-stage-button>span:first-child{display:inline-grid;place-items:center;border-radius:50%;width:29px;height:29px;background:var(--fh-soft);color:var(--fh-accent);flex:none;font-size:.8rem;font-weight:750}.fh-stage-button small{display:block;font-size:.72rem;font-weight:450;color:var(--fh-muted);line-height:1.4;margin-top:3px}.fh-stage-button[aria-pressed=true]{border-color:var(--fh-accent);box-shadow:inset 3px 0 var(--fh-accent)}.fh-stage-button[aria-pressed=true]>span:first-child{background:#086769;color:#fff}.fh-explanations{border-radius:12px;padding:28px 32px;background:var(--fh-paper);border:1px solid var(--fh-line)}.fh-stage-detail h2{font-size:1.7rem;letter-spacing:-.035em;margin:5px 0 14px}.fh-stage-detail>p:not(.fh-eyebrow){font-size:1.04rem;line-height:1.85}.fh-discuss{border-left:3px solid #cb842c;background:var(--fh-soft);border-radius:0 8px 8px 0;padding:18px 22px;margin-top:26px}.fh-discuss>span{color:var(--fh-muted);font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;font-weight:700}.fh-discuss h3{font-size:1.04rem;margin:7px 0 12px}.fh summary{cursor:pointer;color:var(--fh-accent);font-weight:650;min-height:44px;padding:9px 0}.fh details p{margin-top:10px}.fh-section-intro{display:flex;gap:20px;justify-content:space-between;align-items:center;margin-bottom:20px}.fh-section-intro h2{font-size:1.5rem;letter-spacing:-.025em;margin:4px 0}.fh-section-intro 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solid var(--fh-line);background:var(--fh-paper);border-radius:12px;margin-bottom:16px}.fh-question fieldset{padding:0;margin:0 0 14px;border:0;min-width:0}.fh-question legend{display:block;width:100%;margin-bottom:18px}.fh-question legend>span{display:block}.fh-question-title{font-size:1.13rem;font-weight:700;margin-top:8px}.fh-option{display:flex;align-items:flex-start;gap:12px;border:1px solid var(--fh-line);border-radius:8px;padding:12px 14px;margin-top:8px;cursor:pointer;font-size:.92rem}.fh-option:has(input:checked){border-color:var(--fh-accent);background:var(--fh-soft)}.fh-option input{margin-top:4px;width:18px;height:18px;accent-color:#086769;flex:none}.fh-teacher-note{border-top:1px solid var(--fh-line);margin-top:30px;padding-top:14px;font-size:.85rem;color:var(--fh-muted)}.fh-teacher-note a{color:var(--fh-accent);text-decoration:underline}.fh-tool-status{margin-top:10px!important;font-size:.85rem}.fh-note{padding:14px;background:var(--fh-paper)}.fh-print-only{display:none}.fh:fullscreen{max-width:none;width:100%;height:100%;overflow:auto;background:var(--fh-soft);padding:18px 30px}.fh:fullscreen .fh-heading{margin-bottom:12px}.fh:fullscreen .fh-back,.fh:fullscreen .fh-heading .fh-eyebrow,.fh:fullscreen .fh-lead{display:none}.fh:fullscreen .fh-heading h1{font-size:1.7rem;margin:0}.fh:fullscreen .fh-scene-scroll{max-width:1200px;margin:auto}[data-theme=dark] .fh{--fh-ink:#e0ecee;--fh-muted:#b2c5cd;--fh-paper:#172e38;--fh-soft:#10242d;--fh-line:#3b555e;--fh-accent:#7edbd0}@media screen and (max-width:1000px){.fh-heading{align-items:flex-start;flex-direction:column;gap:16px}.fh-heading-actions{justify-content:flex-start}.fh-discovery-grid{grid-template-columns:280px 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small{display:none}.fh-explanations{padding:22px}.fh-section-intro{align-items:flex-start;flex-direction:column}.fh-check-row{align-items:flex-start;flex-direction:column;gap:12px}.fh-question{padding:18px}.fh:fullscreen{padding:12px}}@media print{@page{size:A4 portrait;margin:12mm}#main-content,.fh,body,html{background:#fff!important;color:#111!important;margin:0!important;padding:0!important;width:auto!important;max-width:none!important}#main-content>:not(.fh),.fh>:not(.fh-print-only),body>:not(main):not(script):not(style):not(link){display:none!important}.fh .fh-print-only{display:block!important;font:11pt/1.4 sans-serif;color:#111}.fh-print-heading{display:flex;justify-content:space-between;align-items:baseline;gap:10mm;border-bottom:1pt solid #222;padding-bottom:3mm;margin-bottom:3mm}.fh-print-heading strong{font-size:19pt}.fh-print-heading span{font-size:9pt}.fh .fh-print-only p{color:#111!important;margin:2mm 0}.fh .fh-print-only h2{color:#111!important;font-size:13pt;margin:4mm 0 2mm}.fh .fh-print-only .fh-landscape{min-width:0;width:100%;height:auto;print-color-adjust:exact;-webkit-print-color-adjust:exact}.fh-print-labels{display:grid;grid-template-columns:1fr 1fr;gap:1mm 5mm}.fh-print-page-two{break-before:page}.fh-print-question{break-inside:avoid;margin-bottom:7mm}.fh-print-credit{font-size:8pt;margin-top:8mm!important}.fh[data-print-kind=answer] .fh-print-student{display:none!important}.fh:not([data-print-kind=answer]) .fh-print-answer{display:none!important}.fh:not([data-print-kind=answer]) .fh-print-only [data-history-label]{visibility:hidden}.fh[data-print-kind=answer] .fh-print-only [data-history-label]{visibility:visible}.fh .fh-print-only [hidden]{display:initial!important}}.fh .fh-landscape{min-width:0;padding:24px;background:#eef3f8;color:#213b53}.fh-timeline-title{display:flex;flex-direction:column;gap:5px;margin-bottom:20px}.fh-timeline-title span{font-size:.7rem;font-weight:750;letter-spacing:.12em}.fh-timeline-title strong{font-size:1.4rem}.fh .fh-track{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin:0;padding:0;list-style:none}.fh-time-card{background:#fff;border:1px solid #cbd8e3;border-top:5px solid #294f74;border-radius:12px;padding:14px;min-width:0}.fh-time-card:first-child{border-top-color:#966027}.fh-time-card:nth-child(2){border-top-color:#78518e}.fh-time-card:nth-child(3){border-top-color:#267665}.fh-card-top{display:flex;gap:8px;align-items:center;font-size:.67rem;min-height:38px}.fh .fh-card-date{font-size:1.8rem;line-height:1.2;margin:16px 0;letter-spacing:-.03em}.fh-time-card:first-child .fh-card-date{font-size:1.25rem}.fh-card-slot{font-size:.93rem;font-weight:650;line-height:1.45;min-height:70px}.fh-timeline-footer{font-size:.76rem;margin-top:20px!important}.fh[data-mode=build] .fh-scene-card [data-history-label]{display:none}.fh[data-mode=build] .fh-scene-card [data-history-placement]{display:flex;align-items:center;padding:8px;border:2px dashed #086769;border-radius:8px;background:#eff8f5}.fh-comparator{padding:22px;margin:20px 0;border:1px solid var(--fh-line);border-radius:14px;background:var(--fh-paper)}.fh-comparator h2{font-size:1.4rem;margin:6px 0 14px}.fh-comparator p{font-size:.87rem}.fh-compare-controls{display:grid;grid-template-columns:1fr 1fr;gap:12px}.fh-compare-controls label{display:flex;flex-direction:column;gap:6px;font-size:.83rem;font-weight:650;min-width:0}#fh-duration{margin:16px 0;font-size:1.05rem;font-weight:750}.fh-time-ruler{display:block;width:100%;margin:10px 0}.fh .fh-scene-scroll::after{display:none}@media screen and (max-width:900px){.fh .fh-track{grid-template-columns:1fr 1fr}}@media screen and (max-width:480px){.fh .fh-track,.fh-compare-controls{grid-template-columns:1fr}.fh .fh-landscape{padding:14px}.fh-card-slot{min-height:44px}}@media print{.fh .fh-print-only .fh-landscape{padding:3mm}.fh .fh-print-only .fh-track{grid-template-columns:repeat(4,minmax(0,1fr));gap:2mm}.fh-print-only .fh-time-card{padding:2mm;border-top-width:1mm;break-inside:avoid}.fh-print-only .fh-card-top{font-size:6.5pt;min-height:8mm;gap:1mm}.fh-print-only .fh-number{width:5mm;height:5mm;font-size:7pt}.fh .fh-print-only .fh-card-date{font-size:17pt;margin:2mm 0}.fh .fh-print-only .fh-time-card:first-child .fh-card-date{font-size:10pt}.fh-print-only .fh-card-slot{font-size:8pt;min-height:16mm}.fh-print-only .fh-timeline-title{display:none}.fh-print-only .fh-timeline-footer{font-size:7pt}}.fh-time-ruler{position:relative;height:110px;background:#f1f5fa;border-radius:12px;color:#365767}.fh-ruler-description{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}.fh-ruler-axis{position:absolute;left:3%;width:94%;top:54px;height:3px;background:#7f91a7}.fh-ruler-tick{position:absolute;top:35px;height:30px;border-left:1.5px solid #7f91a7}.fh-ruler-tick>span{position:absolute;top:-27px;transform:translateX(-50%);font-size:clamp(10px, 1.4vw, 17px)}.fh-ruler-interval{position:absolute;top:51px;height:9px;background:#086769}.fh-ruler-point{position:absolute;top:47px;width:16px;height:16px;transform:translateX(-50%);border-radius:50%;background:#086769}.fh-ruler-boundary{position:absolute;left:3%;bottom:10px;font-size:clamp(11px, 1.4vw, 17px)}.fh-ruler-boundary-end{left:auto;right:3%}