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solid var(--rule)}.panel-top .wordmark{font-size:15px}.panel-top .brand-mark{width:13px;height:13px}.panel-local{margin-left:auto}.dialog-close{display:grid;width:38px;height:38px;place-items:center;border:1px solid var(--rule);background:none;font-size:20px}.dialog-close:hover{border-color:var(--signal);color:var(--signal-ink)}.panel-retained{padding:14px 28px;border-bottom:1px solid var(--rule);background:var(--paper-2)}.panel-retained ul{display:flex;flex-wrap:wrap;gap:8px 26px;margin-top:8px}.panel-retained li{display:inline-flex;flex-direction:column;gap:2px}.panel-retained li b{font-size:14px;font-weight:600;color:var(--signal-ink)}.panel-retained p{margin-top:6px;color:var(--muted);font-size:14px}.panel-progress{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 28px;border-bottom:1px solid var(--rule)}.panel-progress>div{display:flex;gap:5px}.panel-progress i{display:block;width:26px;height:2px;background:var(--rule-strong)}.panel-progress i.is-active{background:var(--signal)}.panel-content{flex:1 1 auto;padding:30px 28px 34px;animation:soft-reveal .26s ease both}.panel-content h2{max-width:560px;margin-top:12px;font-size:clamp(1.7rem,3vw,2.4rem);font-weight:500;line-height:1.05;letter-spacing:-.035em;outline:none}.choice-list{margin-top:24px;border-top:1px solid var(--rule)}.choice-list button{display:grid;width:100%;grid-template-columns:22px 1fr 18px;align-items:center;gap:14px;min-height:56px;padding:14px 2px;border:0;border-bottom:1px solid var(--rule);background:transparent;color:var(--ink-2);text-align:left;font-size:16px}.choice-mark{width:10px;height:10px;border:1px solid var(--rule-strong);border-radius:50%}.choice-list button .icon-arrow{color:transparent}.choice-list button:hover,.choice-list button.is-active{color:var(--ink)}.choice-list button.is-active .choice-mark{border-color:var(--signal);background:var(--signal)}.choice-list button.is-active .icon-arrow{color:var(--signal)}.selectable-options{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}.selectable-options button{display:inline-flex;align-items:center;gap:8px;min-height:42px;padding:8px 14px;border:1px solid var(--rule-strong);background:transparent;color:var(--ink-2);font-size:14px;transition:border-color .18s ease,color .18s ease,background .18s ease}.selectable-options button:before{content:"+";color:var(--quiet);font-family:var(--font-mono)}.selectable-options button:hover{border-color:var(--ink);color:var(--ink)}.selectable-options button.is-active{border-color:var(--signal);color:var(--signal-ink);background:var(--signal-tint)}.selectable-options button.is-active:before{content:"✓";color:var(--signal-ink)}.dialog-input,.dialog-textarea{display:block;width:100%;margin-top:16px;padding:14px;border:1px solid var(--rule-strong);border-radius:0;background:#fbfaf6;color:var(--ink);font-size:15px}.dialog-textarea{min-height:200px;margin-top:22px;resize:vertical;line-height:1.6}.dialog-input::placeholder,.dialog-textarea::placeholder{color:var(--quiet)}.synthesis{margin-top:24px;border-top:1px solid var(--rule)}.synthesis-row{display:grid;grid-template-columns:170px 1fr;gap:16px;padding-block:14px;border-bottom:1px solid var(--rule)}.synthesis-row p{color:var(--ink);font-size:15px;line-height:1.6}.layer-chip{display:inline-block;margin:0 8px 6px 0;padding:4px 9px;border:1px solid var(--signal);color:var(--signal-ink);font-size:13px}.synthesis-disclaimer{display:flex;align-items:center;gap:12px;margin-top:18px;color:var(--ink-2);font-size:14px;line-height:1.5}.synthesis-disclaimer .trace-mark{flex:0 0 auto;color:var(--signal)}.panel-bottom{display:flex;flex:0 0 auto;align-items:center;justify-content:space-between;gap:16px;padding:16px 28px;border-top:1px solid var(--rule);background:var(--paper)}.dialog-next{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:44px;padding:10px 16px;border:1px solid var(--signal);background:var(--signal);color:#fff;font-size:14px;font-weight:500}.dialog-next:hover:not(:disabled){background:var(--signal-ink)}.dialog-next:disabled{opacity:.45;cursor:not-allowed}.dialog-next .icon-arrow{width:15px;height:15px}.panel-final-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px 20px}@media(max-width:900px){.route-problem-grid{grid-template-columns:1fr;gap:24px}.route-fields{grid-template-columns:1fr 1fr}}@media(max-width:680px){.route-hero{padding-block:56px 48px}.route-hero h1{font-size:clamp(2.1rem,10vw,2.9rem)}.route-hero>p{font-size:15px}.route-stage-list li{grid-template-columns:30px minmax(0,1fr) 20px;gap:8px 12px;align-items:start}.route-stage-list p{grid-column:2}.route-stage-list li>i{grid-column:3;grid-row:1}.route-fields{grid-template-columns:1fr;gap:18px}.work-filter-head{flex-direction:column;align-items:flex-start;gap:10px}.work-filters{justify-content:flex-start}.work-record-proof{grid-template-columns:1fr}.lab-route-intro{padding-top:60px}.dialog-backdrop{justify-content:stretch}.problem-panel{width:100%;border-left:0}.panel-top,.panel-retained,.panel-progress,.panel-content,.panel-bottom{padding-inline:18px}.panel-content h2{font-size:1.7rem}.synthesis-row{grid-template-columns:1fr;gap:6px}.panel-bottom{flex-wrap:wrap}}.bt-seg{display:none}@supports selector(:has(> *)){:where(section,.gap-stage):has(>.bt-seg){position:relative}.bt-seg{--bt-active: var(--signal);--bt-potential: var(--quiet);--bt-at: calc(clamp(104px, 11vw, 176px) + 8px) ;--bt-mark: 36px;--bt-stub: 36px;display:block;position:absolute;top:0;bottom:0;width:0;left:calc((100% - min(var(--shell),100% - 2 * var(--gutter)))/4);pointer-events:none;user-select:none}.dark-section .bt-seg{--bt-potential: var(--light-muted)}.hero>.bt-seg{--bt-at: calc(100% - 32px) ;--bt-stub: 14px}.gap-stage>.bt-seg{--bt-at: calc(clamp(80px, 9vw, 120px) + 8px) }.gap-section--pinned .gap-stage>.bt-seg{--bt-at: 50%}.final-section>.bt-seg{--bt-at: calc(clamp(96px, 11vw, 160px) + 8px) }.bt-piece{position:absolute;left:-.5px;width:1px}.bt-piece--entry{top:0;height:max(0px,calc(var(--bt-at) - var(--bt-mark) / 2))}.bt-piece--mark{top:calc(var(--bt-at) - var(--bt-mark) / 2);left:0;width:0;height:var(--bt-mark)}.bt-piece--body{top:calc(var(--bt-at) + var(--bt-mark) / 2);bottom:var(--bt-stub)}.bt-piece--exit{bottom:0;height:var(--bt-stub)}.bt-piece[data-bt-line=potential]:not(.bt-piece--mark){background:repeating-linear-gradient(to bottom,var(--bt-potential) 0 3px,transparent 3px 9px)}.bt-piece[data-bt-line=active]:not(.bt-piece--mark){left:-1px;width:2px;background:var(--bt-active)}.bt-piece--mark .trace-mark{position:absolute;top:0;left:0;width:var(--bt-mark);height:calc(var(--bt-mark) / 3);color:var(--bt-potential);transform-origin:0 0;transform:rotate(90deg) translateY(-50%)}.bt-piece--mark[data-bt-line=active] .trace-mark{color:var(--bt-active);stroke-width:2}@media(max-width:680px){.bt-seg{--bt-at: 92px;--bt-mark: 30px;--bt-stub: 24px}.hero>.bt-seg{--bt-at: calc(100% - 68px) }}}@media(forced-colors:active){.bt-seg,.dark-section .bt-seg{forced-color-adjust:none;--bt-potential: GrayText;--bt-active: CanvasText}}@media print{.bt-seg{display:none!important}}