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var(--line)}.explainer-num{font-family:var(--mono);color:var(--green);padding-top:3px;font-size:11px}.explainer-point h3{letter-spacing:-.02em;font-size:1.02rem;font-weight:680}.explainer-point p{color:var(--muted);font-size:var(--text-sm);margin-top:4px}.format-banner{border:1px solid var(--green-deep);background:var(--green-deep);color:var(--white);border-radius:var(--radius);grid-template-columns:1fr auto;align-items:center;gap:26px;margin-top:clamp(42px,6vw,70px);padding:30px;display:grid}.format-banner h2{font-size:var(--text-2xl);max-width:18ch;font-weight:700}.format-banner p{color:#bcd0c1;font-size:var(--text-sm);max-width:58ch;margin-top:8px}.bench-page{padding-top:34px}.breadcrumb{font-family:var(--mono);color:var(--muted);align-items:center;gap:9px;margin-bottom:22px;font-size:11px;display:flex}.breadcrumb a{color:var(--green);text-decoration:none}.breadcrumb a:hover{text-decoration:underline}.bench-head{border-bottom:1px solid var(--line-strong);grid-template-columns:minmax(0,1fr) 300px;align-items:end;gap:34px;padding-bottom:28px;display:grid}.bench-head h1{font-size:var(--text-4xl);letter-spacing:-.05em;max-width:15ch;font-weight:760}.bench-head p{color:var(--muted);max-width:56ch;margin-top:14px}.bench-head-side{text-align:right;justify-items:end;gap:14px;display:grid}.bench-head-side .chip{background:var(--green-soft);color:var(--green-deep);border-color:#bfd9c8}.bench-id{font-family:var(--mono);color:var(--muted);font-size:10px}.bench-nav{top:var(--header-h);z-index:30;background:color-mix(in srgb, var(--paper) 94%, transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);scrollbar-width:none;align-items:center;gap:2px;margin:0 -10px;padding:10px;display:flex;position:sticky;overflow-x:auto}.bench-nav::-webkit-scrollbar{display:none}.bench-nav button,.bench-nav a{font-size:var(--text-sm);color:var(--muted);white-space:nowrap;background:0 0;border:0;border-radius:7px;flex-shrink:0;padding:8px 12px;font-weight:620;text-decoration:none}.bench-nav button[aria-selected=true],.bench-nav a[aria-current=page]{background:var(--green-deep);color:var(--lime)}.bench-nav button:hover,.bench-nav a:hover{color:var(--ink)}.bench-body{padding-top:26px}.bench-layout{grid-template-columns:minmax(0,1fr);gap:26px;display:grid}.bench-toolbar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;margin-bottom:18px;display:flex}.bench-toolbar h2{font-size:var(--text-2xl)}.bench-toolbar p{color:var(--muted);font-size:var(--text-sm)}.unit-tabs{flex-wrap:wrap;gap:8px;margin-bottom:20px;display:flex}.unit-tabs button{border:1px solid var(--line);background:var(--surface);font-size:var(--text-sm);color:var(--muted);border-radius:9px;align-items:center;gap:9px;padding:10px 14px;font-weight:650;display:flex}.unit-tabs button[aria-selected=true]{border-color:var(--green-deep);background:var(--green-deep);color:var(--lime)}.unit-tabs button span{font-family:var(--mono);opacity:.65;font-size:10px}.unit-intro{grid-template-columns:minmax(0,1fr) 290px;align-items:start;gap:28px;margin-bottom:26px;display:grid}.unit-intro h2{font-size:var(--text-3xl);max-width:20ch;font-weight:720}.unit-intro p{color:var(--muted);margin-top:12px}.unit-side{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);padding:18px}.unit-side h3{font-family:var(--mono);color:var(--muted);margin-bottom:10px;font-size:11px;font-weight:500}.unit-side .skill{font-size:var(--text-sm);color:var(--ink-2);line-height:1.45}.unit-side .progress-track{margin-top:16px}.unit-side .progress-label{font-family:var(--mono);color:var(--muted);justify-content:space-between;gap:8px;margin-top:8px;font-size:10px;display:flex}.lesson-controls{flex-wrap:wrap;align-items:center;gap:9px;display:flex}.story{border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--surface);grid-template-columns:minmax(0,1.15fr) minmax(300px,.85fr);gap:0;display:grid;overflow:hidden}.story-visual{background:linear-gradient(#14231c0c 1px,#0000 1px) 0 0/28px 28px,linear-gradient(90deg,#14231c0c 1px,#0000 1px) 0 0/28px 28px,linear-gradient(145deg,#f4f6ec,#e7ebdc);place-items:center;min-height:390px;padding:20px;display:grid;position:relative;overflow:hidden}.story-visual-inner{aspect-ratio:1;place-items:center;width:min(100%,440px);display:grid;position:relative}.story-caption{border-left:1px solid var(--line);background:var(--surface);align-content:space-between;gap:18px;padding:22px;display:grid}.story-caption-top{gap:10px;display:grid}.scene-index{font-family:var(--mono);color:var(--green);align-items:center;gap:8px;font-size:10px;display:flex}.scene-index:before{content:"";background:var(--green);width:22px;height:1px}.story-dialogue{color:var(--ink-2);min-height:88px;font-size:1.02rem;line-height:1.45}.story-dialogue strong{color:var(--green-deep)}.story-screen-text{background:var(--lime-soft);font-family:var(--mono);color:#3e4d18;border:1px solid #dbeaa2;border-radius:6px;margin-top:4px;padding:6px 9px;font-size:11px;display:inline-block}.story-caption-bottom{gap:10px;display:grid}.story-timeline{gap:4px;display:flex}.story-tick{background:var(--paper-deep);border-radius:999px;flex:1;height:4px;overflow:hidden}.story-tick span{background:var(--green);border-radius:inherit;height:100%;display:block}.story-controls{align-items:center;gap:8px;display:flex}.story-time{font-family:var(--mono);color:var(--muted);margin-left:auto;font-size:10px}.key-idea{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);grid-template-columns:repeat(auto-fit,minmax(220px,1fr));display:grid;overflow:hidden}.key-idea-item{background:var(--surface);border-right:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px}.key-idea-item h3{font-family:var(--mono);color:var(--green);margin-bottom:7px;font-size:10px;font-weight:500}.key-idea-item p{font-size:var(--text-sm);color:var(--ink-2);line-height:1.45}.formula-box{border:1px dashed var(--line-strong);background:var(--surface-2);font-family:var(--mono);color:var(--ink-2);border-radius:10px;padding:16px 18px;font-size:12px;overflow-x:auto}.rotation-workbench{border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--surface);grid-template-columns:minmax(0,1.2fr) minmax(310px,.8fr);gap:0;display:grid;overflow:hidden}.rotation-stage{background:linear-gradient(#14231c0d 1px, transparent 1px), linear-gradient(90deg, #14231c0d 1px, transparent 1px), var(--paper);background-size:24px 24px;place-items:center;min-height:540px;padding:24px;display:grid;position:relative;overflow:hidden}.rotation-stage:before{content:"";border:1px solid var(--line);pointer-events:none;border-radius:10px;position:absolute;inset:16px}.stage-topline{z-index:10;justify-content:space-between;align-items:flex-start;gap:12px;display:flex;position:absolute;top:24px;left:28px;right:28px}.stage-chip{background:var(--surface);border:1px solid var(--line);font-family:var(--mono);color:var(--muted);border-radius:6px;align-items:center;gap:7px;padding:6px 8px;font-size:10px;display:inline-flex}.rotation-canvas-wrap{aspect-ratio:1;width:min(100%,440px);position:relative}.rotation-svg{touch-action:none;-webkit-user-select:none;user-select:none;width:100%;height:100%}.rotation-panel{border-left:1px solid var(--line);background:var(--surface);align-content:start;gap:18px;padding:22px;display:grid}.readout-grid{border:1px solid var(--line);background:var(--line);border-radius:9px;grid-template-columns:repeat(3,1fr);gap:1px;display:grid;overflow:hidden}.readout-cell{background:var(--surface);padding:12px}.readout-cell span{font-family:var(--mono);color:var(--muted);margin-bottom:4px;font-size:9px;display:block}.readout-cell strong{font-family:var(--mono);font-variant-numeric:tabular-nums;font-size:1.25rem;font-weight:500;line-height:1}.fit-list{gap:6px;max-height:150px;display:grid;overflow-y:auto}.fit-pill{border:1px solid var(--line);background:var(--surface-2);font-family:var(--mono);border-radius:6px;justify-content:space-between;align-items:center;gap:10px;padding:8px 10px;font-size:11px;display:flex}.fit-pill.good{background:var(--green-soft);color:var(--green-deep);border-color:#bcd9c6}.sleep-note{color:var(--muted);font-size:12px;line-height:1.5}.shapes-tray{flex-wrap:wrap;gap:8px;display:flex}.shape-tab{border:1px solid var(--line);background:var(--surface);color:var(--muted);border-radius:8px;align-items:center;gap:8px;padding:6px 9px;font-size:12px;font-weight:600;display:flex}.shape-tab[aria-pressed=true]{border-color:var(--green);background:var(--green-soft);color:var(--green-deep)}.shape-mini{place-items:center;width:22px;height:22px;display:grid}.observation-grid{grid-template-columns:minmax(0,1.15fr) minmax(280px,.85fr);gap:20px;display:grid}.observation-table-wrap{overflow-x:auto}.observation-table input{width:74px}.observation-table input.wide{width:100%;min-width:120px}.guiding-list{gap:10px;display:grid}.guiding-item{border:1px solid var(--line);background:var(--surface);border-radius:9px;overflow:hidden}.guiding-item button{text-align:left;width:100%;font-size:var(--text-sm);background:0 0;border:0;justify-content:space-between;align-items:center;gap:12px;padding:12px 14px;font-weight:600;display:flex}.guiding-item button>span:first-child{min-width:0}.guiding-item button span:last-child{font-family:var(--mono);color:var(--muted);flex-shrink:0;font-size:10px}.guiding-item .answer{color:var(--muted);padding:0 14px 14px;font-size:12px}.worked-example{grid-template-columns:minmax(0,1.1fr) minmax(280px,.9fr);gap:22px;display:grid}.example-steps{border:1px solid var(--line);background:var(--line);border-radius:10px;gap:1px;display:grid;overflow:hidden}.example-step{background:var(--surface);grid-template-columns:30px 1fr;gap:12px;padding:14px;display:grid}.example-step .num{font-family:var(--mono);color:var(--green);font-size:11px}.example-step h3{font-size:.95rem;font-weight:680}.example-step p{color:var(--muted);margin-top:4px;font-size:12px}.checkpoint{background:var(--green-soft);border:1px solid #b9d8c5;border-radius:10px;padding:16px}.checkpoint h3{color:var(--green-deep);font-size:.95rem}.checkpoint p{color:#315a48;margin-top:5px;font-size:12px}.checkpoint-actions{flex-wrap:wrap;gap:8px;margin-top:12px;display:flex}.checkpoint-actions .btn{min-height:34px;box-shadow:none;padding:7px 11px;font-size:12px}.exercise{gap:18px;display:grid}.exercise-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:14px;display:flex}.exercise-head h2{font-size:var(--text-2xl)}.exercise-score{align-items:center;gap:12px;display:flex}.question-card{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);overflow:hidden}.question-card[data-locked=true]{border-color:var(--line-strong)}.question-head{justify-content:space-between;align-items:flex-start;gap:16px;padding:18px 20px 0;display:flex}.question-head h3{max-width:65ch;font-size:1.02rem;font-weight:680;line-height:1.35}.question-meta{flex-wrap:wrap;align-items:center;gap:7px;margin-top:8px;display:flex}.q-mark{font-family:var(--mono);color:var(--muted);font-size:10px}.question-body{gap:14px;padding:16px 20px 20px;display:grid}.mcq-options{gap:8px;display:grid}.mcq-option{border:1px solid var(--line);background:var(--surface);text-align:left;font-size:var(--text-sm);color:var(--ink-2);border-radius:8px;align-items:flex-start;gap:11px;padding:11px 12px;transition:border .12s,background .12s;display:flex}.mcq-option:hover{border-color:var(--green)}.mcq-option[aria-pressed=true]{border-color:var(--green);background:var(--green-soft)}.mcq-option[data-state=correct]{background:var(--green-soft);border-color:#78b28e}.mcq-option[data-state=wrong]{background:var(--red-soft);border-color:#d99a8d}.option-key{border:1px solid var(--line-strong);width:22px;height:22px;font-family:var(--mono);color:var(--muted);background:var(--surface);border-radius:50%;flex-shrink:0;place-items:center;font-size:10px;display:grid}.mcq-option[aria-pressed=true] .option-key{background:var(--green-deep);color:var(--lime);border-color:var(--green-deep)}.num-fields{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;display:grid}.num-field label{color:var(--muted);margin-bottom:5px;font-size:12px;display:block}.num-field .input{max-width:220px}.tf-rows{gap:10px;display:grid}.tf-row{border:1px solid var(--line);background:var(--surface);border-radius:8px;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:14px;padding:12px;display:grid}.tf-row p{font-size:var(--text-sm)}.tf-toggle{border:1px solid var(--line-strong);border-radius:7px;flex-shrink:0;display:inline-flex;overflow:hidden}.tf-toggle button{color:var(--muted);background:0 0;border:0;padding:7px 11px;font-size:12px;font-weight:600}.tf-toggle button[aria-pressed=true]{background:var(--green-deep);color:var(--lime)}.group-board{grid-template-columns:230px minmax(0,1fr);align-items:start;gap:16px;display:grid}.card-pool{border:1px dashed var(--line-strong);background:var(--surface-2);border-radius:9px;flex-wrap:wrap;gap:8px;min-height:70px;padding:12px;display:flex}.drag-card{border:1px solid var(--line-strong);background:var(--surface);cursor:grab;touch-action:none;border-radius:7px;padding:8px 10px;font-size:12px;font-weight:620}.drag-card[data-dragging=true]{opacity:.55}.group-columns{grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;display:grid}.group-box{border:1px solid var(--line);background:var(--surface);border-radius:9px;min-height:96px;padding:10px}.group-box h4{font-family:var(--mono);color:var(--muted);margin-bottom:8px;font-size:10px;font-weight:500}.group-box[data-over=true]{border-color:var(--green);background:var(--green-soft)}.group-box .cards{flex-wrap:wrap;gap:6px;display:flex}.match-board{grid-template-columns:1fr 1fr;gap:80px;min-height:220px;display:grid;position:relative}.match-column{align-content:start;gap:8px;display:grid}.match-item{border:1px solid var(--line);background:var(--surface);text-align:left;border-radius:7px;min-height:40px;padding:10px 12px;font-size:12px;font-weight:600}.match-item[aria-pressed=true],.match-item[data-connected=true]{border-color:var(--green);background:var(--green-soft)}.match-lines{pointer-events:none;width:100%;height:100%;position:absolute;inset:0}.match-line{stroke:var(--green);stroke-width:2px;stroke-dasharray:4 3}.rotate-question{grid-template-columns:280px minmax(0,1fr);align-items:start;gap:18px;display:grid}.rotate-question .rotation-stage{min-height:300px;padding:12px}.rotate-question .rotation-stage:before{inset:8px}.rotate-question .rotation-canvas-wrap{width:260px}.rotate-question .stage-topline{display:none}.fan-demo{width:140px;height:140px;margin:0 auto;position:relative}.fan-blade{background:var(--green);transform-origin:50% 0;opacity:.8;border-radius:6px 6px 2px 2px;width:8px;height:56px;margin-left:-4px;position:absolute;top:50%;left:50%}.fan-demo.spinning .fan-blade{animation:3s linear infinite fan-spin}@keyframes fan-spin{to{transform:rotate(360deg)}}.scenario{border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--surface);grid-template-columns:minmax(0,1.15fr) minmax(320px,.85fr);gap:0;display:grid;overflow:hidden}.scenario-copy{align-content:start;gap:14px;padding:clamp(22px,4vw,34px);display:grid}.scenario-copy h2{font-size:var(--text-3xl);max-width:16ch}.scenario-copy p{color:var(--muted)}.scenario-facts{border:1px solid var(--line);background:var(--line);border-radius:9px;gap:1px;margin-top:4px;display:grid;overflow:hidden}.scenario-fact{background:var(--surface);font-size:var(--text-sm);grid-template-columns:110px 1fr;gap:10px;padding:10px 12px;display:grid}.scenario-fact span{font-family:var(--mono);color:var(--muted);padding-top:2px;font-size:10px}.scenario-art{background:linear-gradient(#14231c0b 1px,#0000 1px) 0 0/24px 24px,linear-gradient(90deg,#14231c0b 1px,#0000 1px) 0 0/24px 24px,linear-gradient(145deg,#eef3dc,#dce7bd);place-items:center;min-height:380px;padding:18px;display:grid;position:relative;overflow:hidden}.specimen-grid{grid-template-columns:repeat(4,1fr);gap:12px;display:grid}.specimen-card{border:1px solid var(--line);background:var(--surface);text-align:left;border-radius:12px;transition:border .15s,transform .15s;overflow:hidden}.specimen-card:hover{border-color:var(--green);transform:translateY(-2px)}.specimen-card[aria-pressed=true]{border-color:var(--green-deep);box-shadow:inset 0 0 0 1px var(--green-deep)}.specimen-figure{aspect-ratio:1;background:var(--paper-deep);place-items:center;display:grid;position:relative;overflow:hidden}.specimen-figure:after{content:"";background-image:linear-gradient(#14231c0b 1px,#0000 1px),linear-gradient(90deg,#14231c0b 1px,#0000 1px);background-size:16px 16px;position:absolute;inset:0}.specimen-card-body{padding:12px 13px 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