:root{color-scheme:light;--ink:#191627;--muted:#6b6780;--paper:#f6f4f0;--panel:#fffdfa;--line:#e0dcd4;--violet:#4a3aa8;--violet-soft:#e6e2f7;--cyan:#0d7d8c;--cyan-soft:#daeef0;--rust:#b8492c;--rust-soft:#f8e4dd;--amber:#a07100;--topbar:rgba(246,244,240,.94);--soft:#efedE8;--soft-strong:#e7e4dd;--shadow:0 12px 34px rgba(30,24,60,.09);--r-lg:12px;--r-md:9px;--r-sm:6px;--r-pill:99px;--ring:0 0 0 3px color-mix(in srgb, var(--violet) 22%, transparent);--nav-active:#191627;--nav-active-text:#fffdfa}[data-theme=dark]{color-scheme:dark;--ink:#eeeaf6;--muted:#9d97b0;--paper:#12111a;--panel:#1a1826;--line:#302c42;--violet:#a89bff;--violet-soft:#272247;--cyan:#5fd3df;--cyan-soft:#12333a;--rust:#ff9a78;--rust-soft:#3d2018;--amber:#e3b64a;--topbar:rgba(18,17,26,.96);--soft:#221f30;--soft-strong:#2a2639;--shadow:0 12px 34px rgba(0,0,0,.34);--nav-active:#e6e2f7;--nav-active-text:#12111a}*{box-sizing:border-box}html{background:var(--paper)}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;font-size:15px;line-height:1.55}code,.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}button{font:inherit}a{color:var(--violet)}.topbar{height:60px;padding:0 clamp(16px,3vw,40px);display:grid;grid-template-columns:auto 1fr auto;gap:24px;align-items:center;border-bottom:1px solid var(--line);background:var(--topbar);position:sticky;top:0;z-index:20;backdrop-filter:blur(12px)}.brand{display:flex;align-items:center;gap:10px;color:inherit;text-decoration:none}.brand-mark{width:32px;height:32px;border-radius:var(--r-md);display:block}.brand strong{display:block;font-size:14px}.brand small{display:block;font-size:9px;color:var(--muted);text-transform:uppercase;letter-spacing:.09em}.top-context{border-left:1px solid var(--line);padding-left:22px;min-width:0}.top-context strong{display:block;font-size:13px}.top-context span{display:block;font-size:11px;color:var(--muted)}nav{display:flex;gap:3px;align-items:center}.nav-button,.omni-button{border:0;background:transparent;padding:8px 11px;border-radius:var(--r-md);color:var(--muted);font-size:13px;cursor:pointer}.nav-button:hover,.omni-button:hover{background:var(--soft);color:var(--ink)}.nav-button.active{background:var(--nav-active);color:var(--nav-active-text)}.theme-toggle{border:1px solid var(--line);background:var(--panel);border-radius:var(--r-md);width:32px;height:32px;cursor:pointer;color:var(--muted);margin-left:6px}.ptable-panel{position:fixed;top:68px;right:clamp(10px,2vw,28px);z-index:30;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow);padding:14px;max-width:calc(100vw - 20px);overflow:auto}.ptable-head{display:flex;align-items:baseline;gap:10px;margin-bottom:10px}.ptable-head strong{font-size:13px}.ptable-head .small{flex:1;min-width:160px}.ptable-head .btn{padding:2px 8px}.ptable-grid{display:grid;grid-template-columns:repeat(18,minmax(30px,34px));gap:3px}.ptable-cell{aspect-ratio:1;border-radius:var(--r-sm);border:1px solid var(--line);display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:pointer;font-size:11px;font-weight:600;line-height:1.1;background:var(--soft);color:var(--ink)}.ptable-cell:hover{outline:2px solid var(--violet);outline-offset:-1px}.ptable-cell span{font-size:8px;font-weight:400;color:var(--muted)}.ptable-cell.empty{visibility:hidden}.ptable-detail{margin-top:10px;min-height:16px}main{max-width:none;margin:0;padding:26px clamp(16px,3vw,40px) 90px}.view{display:none}.view.active{display:block}h1{font-size:23px;margin:0 0 4px}h2{font-size:17px;margin:30px 0 10px}h3{font-size:14px;margin:0 0 6px}.lede{color:var(--muted);margin:0 0 20px;max-width:64ch}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r-lg);padding:16px 18px;margin-bottom:12px}.grid{display:grid;gap:12px}.grid.two{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}.grid.three{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}.pill{display:inline-block;font-size:10px;text-transform:uppercase;letter-spacing:.07em;padding:3px 8px;border-radius:var(--r-pill);background:var(--soft);color:var(--muted)}.pill.critical{background:var(--rust-soft);color:var(--rust)}.pill.high{background:var(--violet-soft);color:var(--violet)}.pill.medium{background:var(--cyan-soft);color:var(--cyan)}a.pill.drill-link{text-decoration:none;cursor:pointer}a.pill.drill-link:hover{filter:brightness(.92);text-decoration:underline}.muted{color:var(--muted)}.small{font-size:12.5px}.kv{display:grid;grid-template-columns:150px 1fr;gap:6px 14px;font-size:13.5px}.kv dt{color:var(--muted)}.kv dd{margin:0}.lab-nomenclature{margin:12px 0;padding:12px;border:1px solid var(--violet);border-radius:var(--r-md);background:var(--violet-soft)}.lab-nomenclature-title{display:flex;gap:12px;align-items:baseline;justify-content:space-between;flex-wrap:wrap}.lab-nomenclature-title span{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}.lab-nomenclature-title strong{font-size:17px;color:var(--violet)}.lab-nomenclature details{margin-top:7px}.lab-nomenclature summary{cursor:pointer;color:var(--violet);font-size:12px}.lab-draw-name{color:var(--violet);font-weight:650}ul.tight{margin:6px 0 0;padding-left:18px}ul.tight li{margin-bottom:3px}.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:16px}select,textarea,input[type=text],input[type=search],input[type=number],input[type=email],input[type=password]{background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:var(--r-md);padding:6px 9px;font:inherit;font-size:13px;appearance:none;-webkit-appearance:none}input[type=search]::-webkit-search-cancel-button{-webkit-appearance:none}select:focus-visible,textarea:focus-visible,input:focus-visible,.btn:focus-visible,.choice:focus-visible,.nav-button:focus-visible{outline:none;border-color:var(--violet);box-shadow:var(--ring)}.btn{border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:var(--r-md);padding:7px 14px;cursor:pointer;font:inherit;font-size:13px;line-height:1.35;transition:background .12s ease,border-color .12s ease}.btn:hover{background:var(--soft)}.btn.primary{background:var(--violet);border-color:var(--violet);color:#fff}.btn.primary:hover{filter:brightness(1.08)}.segmented,.session-mode,.seg{display:inline-flex;background:var(--soft);border-radius:var(--r-md);padding:3px;gap:2px;flex-wrap:wrap;border:1px solid var(--line)}.segmented button,.session-mode button,.seg .btn{border:0;background:transparent;padding:6px 11px;border-radius:var(--r-sm);cursor:pointer;font:inherit;font-size:12.5px;color:var(--muted);margin:0;box-shadow:none;transition:background .12s ease,color .12s ease}.segmented button:hover,.session-mode button:hover,.seg .btn:hover{background:transparent;color:var(--ink)}.segmented button.active,.session-mode button.active,.seg .btn.active{background:var(--panel);color:var(--ink);box-shadow:0 1px 3px #00000014}.q-prompt{font-size:17px;line-height:1.45;margin:2px 0 4px}.md-gap{display:block;height:.55em}.md-item{display:inline-block;min-width:1.9em;font-variant-numeric:tabular-nums;font-weight:600}.q-hint{font-size:12.5px;color:var(--muted);margin:10px 0 16px}.q-hint summary{cursor:pointer;width:max-content;color:var(--violet);font-weight:650;user-select:none}.q-hint p{border-left:2px solid var(--line);padding-left:10px;margin:8px 0 0}.q-hint-figure{margin:8px 0 0;padding-left:10px;border-left:2px solid var(--line);max-width:260px}.q-hint-figure svg{max-width:100%;height:auto}.q-hint-figure figcaption{font-size:12px;font-weight:600;color:var(--muted);margin-top:2px}.choices{display:grid;gap:8px}.choice{display:flex;gap:11px;align-items:flex-start;text-align:left;width:100%;cursor:pointer;border:1px solid var(--line);background:var(--panel);border-radius:var(--r-md);padding:11px 13px;color:inherit}.choice:hover:not(:disabled){border-color:var(--violet)}.choice:disabled{cursor:default}.choice .key{flex:0 0 20px;height:20px;border-radius:var(--r-sm);background:var(--soft);display:grid;place-items:center;font-size:11px;color:var(--muted)}.choice.correct{border-color:var(--cyan);background:var(--cyan-soft)}.choice.wrong{border-color:var(--rust);background:var(--rust-soft)}.choice-why{display:block;font-size:12.5px;color:var(--muted);margin-top:5px}.feedback{margin-top:14px;border-radius:var(--r-md);padding:13px 15px;background:var(--soft);border-left:3px solid var(--violet);white-space:pre-wrap;font-size:13.5px}.feedback.correct{border-left-color:var(--cyan)}.feedback.wrong{border-left-color:var(--rust)}.q-meta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}.kit-wrap{display:grid;grid-template-columns:minmax(300px,1fr) minmax(280px,1fr);gap:18px;align-items:start}@media(max-width:760px){.kit-wrap{grid-template-columns:1fr}}.kit-svg{width:100%;height:auto;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-lg);touch-action:none;cursor:grab}.kit-svg:active{cursor:grabbing}#kit-rotate-wrap{margin-top:10px}.energy-panel{margin-top:10px;padding:10px 12px;background:var(--soft);border:1px solid var(--line);border-radius:var(--r-md);font-size:12.5px}.energy-head{display:flex;justify-content:space-between;gap:10px;color:var(--muted);margin-bottom:4px}.energy-head strong{color:var(--ink)}.energy-panel svg{display:block;width:100%;height:auto}.energy-panel p{margin:5px 0 0;color:var(--muted);line-height:1.4}.energy-panel p strong{color:var(--ink)}.energy-axis{stroke:var(--line);stroke-width:1}.energy-curve{fill:none;stroke:var(--violet);stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round}.energy-now{stroke:var(--rust);stroke-width:1.5;stroke-dasharray:3 3}.energy-label{font-size:9px;fill:var(--muted)}.newman-projection{margin:12px 0 0;padding:12px;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-md)}.newman-projection figcaption{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;font-size:12px;color:var(--muted);margin-bottom:6px}.newman-projection figcaption strong{color:var(--ink)}.newman-projection svg{display:block;width:min(100%,300px);margin:auto;height:auto}.newman-line{stroke:var(--ink);stroke-width:3;stroke-linecap:round}.newman-ring{fill:var(--panel);stroke:var(--ink);stroke-width:3}.newman-dot{fill:var(--ink)}.newman-label{font-size:18px;font-weight:650;fill:var(--ink);stroke:var(--panel);stroke-width:5;paint-order:stroke}.focus-practice{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin-top:11px}.focus-label{font-size:11px;font-weight:650;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-right:2px}.focus-btn{font-size:11.5px;padding:4px 8px}.toolbar.small label{display:flex;align-items:center;gap:5px;font-size:12.5px;color:var(--muted)}input[type=range]{width:100%;accent-color:var(--violet)}.readout{font-size:13px;display:grid;grid-template-columns:auto 1fr;gap:4px 12px}.readout b{font-weight:600}.readout+.readout{margin-top:8px}.lab-chips{display:flex;flex-wrap:wrap;gap:6px}.btn.small{font-size:12px;padding:4px 9px}.lab-chips .btn.small{font-size:12px;padding:4px 9px}.set-row{padding:7px 0;border-top:1px solid var(--line)}.set-row:first-of-type{border-top:0}.set-row-title{font-size:12.5px;margin-bottom:5px}.set-row .toolbar{gap:6px;margin:0}.lab-chips .btn.small.current{background:var(--violet);color:#fff;border-color:var(--violet);cursor:default;font-weight:600}.lab-flip{margin:0 0 12px;padding:8px 10px;background:var(--soft);border-radius:var(--r-md)}.lab-flip-tag{display:block;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);margin-bottom:6px}.res-row{display:flex;align-items:center;flex-wrap:wrap;gap:6px;margin-top:8px}.res-contrib{margin:0;text-align:center}.res-contrib svg{width:130px;height:auto;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-md)}.res-contrib figcaption{margin-top:4px}.res-arrow{font-size:18px;color:var(--muted)}details.small ol.tight{margin:6px 0 0;padding-left:18px}details.small summary{cursor:pointer;color:var(--muted);margin-top:8px}.lab-search{position:relative;display:inline-block}.lab-search input{font-size:12.5px;padding:5px 9px;border:1px solid var(--line);border-radius:var(--r-md);background:var(--panel);color:var(--ink);min-width:230px}#lab-structure-results{position:absolute;z-index:20;left:0;min-width:100%;margin:4px 0 0;padding:4px;list-style:none;max-height:340px;overflow:auto;white-space:nowrap;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-md);box-shadow:0 8px 24px #0000001f}#lab-structure-results li{padding:5px 8px;border-radius:var(--r-sm);font-size:12.5px;cursor:pointer}#lab-structure-results li:hover{background:var(--soft)}#lab-structure-results li.current{background:var(--soft);font-weight:600}#lab-structure-results li.group{cursor:default;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);padding:8px 8px 3px}#lab-structure-results li.group:hover{background:transparent}#lab-structure-results li.muted{cursor:default}#lab-structure-results li.muted:hover{background:transparent}.badge{display:inline-block;padding:3px 9px;border-radius:var(--r-pill);font-size:11px;font-weight:600}.badge.staggered{background:var(--cyan-soft);color:var(--cyan)}.badge.eclipsed{background:var(--rust-soft);color:var(--rust)}.saw-bond{stroke:var(--muted);stroke-width:3;stroke-linecap:round}.saw-main{stroke:var(--violet);stroke-width:5;stroke-linecap:round}.saw-dot{fill:var(--violet)}.saw-label{font-size:13px;font-weight:650;fill:var(--ink)}.saw-note{font-size:10px;fill:var(--muted)}.atlas-fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:10px;margin-top:10px}.field{background:var(--soft);border-radius:var(--r-md);padding:9px 11px}.field b{display:block;font-size:10px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin-bottom:3px}.note{margin-top:10px;font-size:13px;border-left:3px solid var(--amber);padding-left:11px;color:var(--muted)}table{width:100%;border-collapse:collapse;font-size:13px}th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);vertical-align:top}th{font-size:10.5px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted)}.bar{height:7px;border-radius:var(--r-pill);background:var(--soft-strong);overflow:hidden;margin-top:6px}.bar>span{display:block;height:100%;background:var(--violet)}.stat{font-size:26px;font-weight:600}.stat small{font-size:12px;font-weight:400;color:var(--muted);display:block}.view-actions{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;gap:12px}.compact-stat{font-size:12px;color:var(--muted)}.compact-stat b{color:var(--ink);font-size:15px}.practice-layout{display:grid;grid-template-columns:264px 1fr;gap:16px;align-items:start}.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--r-lg);padding:16px 10px 16px 16px;position:sticky;top:76px;max-height:calc(100vh - 96px);overflow-y:auto;overscroll-behavior:contain}.panel h2{margin:0 0 12px;font-size:13px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted)}.panel label:not(.filter-row){display:block;font-size:12px;color:var(--muted);margin-bottom:4px}.panel>label:not(:first-of-type){margin-top:14px}.panel select:not(.visually-hidden),.panel input{width:100%;margin-top:4px}.filter-search{margin-bottom:4px}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.filter-list{margin:0 0 14px;max-height:172px;overflow-y:auto;overscroll-behavior:contain;background:var(--soft);border:1px solid var(--line);border-radius:var(--r-md);padding:4px}.panel .filter-row{display:flex;align-items:center;gap:9px;padding:6px 8px;border-radius:var(--r-sm);font-size:12.5px;line-height:1.3;color:var(--ink);cursor:pointer;margin:0;transition:background .1s ease}.panel .filter-row:hover{background:var(--panel)}.panel .filter-row input{width:14px;height:14px;flex:0 0 14px;margin:0;accent-color:var(--violet);cursor:pointer}.panel .filter-row span{flex:1 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.panel .filter-row:has(input:checked){background:var(--violet-soft);font-weight:600}.panel .filter-row.is-filtered{display:none}.filter-field .filter-search{margin:0 0 4px;width:100%}.filter-empty{margin:-10px 0 14px;padding:0 2px}.set-request{display:flex;gap:6px;align-items:center;margin-top:4px}.set-request input{flex:1 1 auto;min-width:0;margin-top:0}.set-request .btn{flex:0 0 auto;padding:6px 11px}.set-request .btn.icon{padding:6px 0;width:32px;text-align:center;font-size:15px;line-height:1}.set-request .btn.icon:hover{background:var(--soft);color:var(--violet)}#set-request-note{margin:6px 0 14px;min-height:1.2em}#set-request-note.thinking{opacity:.65}#set-request-note strong{color:var(--ink);font-weight:600}.panel-note{font-size:11px;line-height:1.45;color:var(--muted);margin:-8px 0 14px}.filter-availability{font-size:11.5px;line-height:1.45;color:var(--muted);background:var(--soft);border-radius:var(--r-md);padding:8px 10px;margin-bottom:14px;border:1px solid var(--line)}.session-mode{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));margin-bottom:16px;width:100%}.session-mode button{min-width:0;padding:7px 6px;font-size:11.5px;white-space:nowrap;text-align:center}.btn.full{width:100%}.exam-preset{width:100%;font-size:11.5px;margin-bottom:10px;text-align:left;line-height:1.4}.session-mini{display:flex;justify-content:space-between;font-size:11.5px;color:var(--muted);margin-top:12px}.session-mini b{color:var(--ink);font-size:14px}#panel-toggle{display:none}@media(max-width:820px){.topbar{height:auto;grid-template-columns:minmax(0,1fr);gap:8px;padding-block:10px}.top-context{display:none}.topbar nav{min-width:0;max-width:100%;overflow-x:auto}.topbar nav button{flex-shrink:0}.practice-layout{grid-template-columns:1fr}.panel{position:static;max-height:none;display:none}.panel.open{display:block}#panel-toggle{display:inline-block}}.prep12-details{position:relative;margin:0 0 14px;padding:10px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--soft);font-size:12px}.tip{display:inline-grid;place-items:center;width:18px;height:18px;margin-left:4px;border-radius:50%;background:var(--violet);color:#fff;font-weight:700;cursor:help}.tip-card{display:none;position:absolute;z-index:5;left:8px;right:8px;top:36px;padding:10px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--panel);box-shadow:var(--shadow);line-height:1.45}.tip:hover+.tip-card,.tip:focus+.tip-card{display:block}.q-figure{width:100%;max-width:300px;height:auto;display:block;margin:4px auto 14px;background:var(--soft);border:1px solid var(--line);border-radius:var(--r-lg)}.q-figure.q-diagram{max-width:560px}.q-figure-row{display:flex;gap:12px;flex-wrap:wrap;justify-content:center}.q-figure-pair{margin:0;flex:1 1 240px;max-width:300px}.q-figure-pair figcaption{text-align:center;font-size:12px;font-weight:600;color:var(--muted);margin-bottom:2px}.q-image-enlarge{display:block;cursor:zoom-in}.image-lightbox{position:fixed;inset:0;max-width:min(96vw,1400px);max-height:94vh;padding:42px 16px 16px;border:0;border-radius:var(--r-lg);background:var(--panel);overflow:auto}.image-lightbox::backdrop{background:#0a0e18d1}.image-lightbox img{display:block;max-width:100%;max-height:calc(94vh - 58px);width:auto;height:auto;margin:auto;object-fit:contain}.image-lightbox-close{position:absolute;top:8px;right:10px;width:32px;height:32px;border:0;border-radius:50%;background:var(--soft-strong);color:var(--ink);font-size:24px;line-height:1;cursor:pointer}.test-status{display:flex;justify-content:space-between;align-items:center;font-size:13px;margin-bottom:8px}.test-status b{font-size:13px}#test-timer{font-variant-numeric:tabular-nums;font-weight:600;color:var(--violet)}#test-timer.urgent{color:var(--rust)}.test-progress{height:5px;border-radius:var(--r-pill);background:var(--soft-strong);overflow:hidden;margin-bottom:14px}.test-progress i{display:block;height:100%;background:var(--violet)}.test-nav{display:flex;justify-content:space-between;gap:10px;margin-top:16px}.choice.selected{border-color:var(--violet);background:var(--violet-soft)}.test-grid{display:flex;flex-wrap:wrap;gap:5px;margin:12px 0}.test-grid button{width:30px;height:30px;border-radius:var(--r-sm);border:1px solid var(--line);background:var(--panel);cursor:pointer;font-size:11px;color:var(--muted)}.test-grid button.answered{background:var(--violet-soft);border-color:var(--violet);color:var(--ink)}.test-grid button.current{outline:2px solid var(--violet)}.test-grid button.right{background:var(--cyan-soft);border-color:var(--cyan)}.test-grid button.wrong{background:var(--rust-soft);border-color:var(--rust)}.score-hero{display:flex;gap:24px;align-items:baseline;flex-wrap:wrap;margin-bottom:6px}.score-hero .big{font-size:40px;font-weight:600;line-height:1}.review-item{border-top:1px solid var(--line);padding:14px 0}.review-item:first-of-type{border-top:0}.review-answers{margin:6px 0}.review-choices{margin:8px 0;list-style:none;padding-left:0}.review-choices li{padding:5px 0;border-top:1px dashed var(--line)}.review-choices li:first-child{border-top:0}.ans-right{color:var(--cyan)}.ans-wrong{color:var(--rust)}.recent-tests{list-style:none;padding:0;margin:6px 0 0}.recent-tests li{display:flex;flex-direction:column;gap:1px;padding:5px 0;border-top:1px solid var(--line)}.recent-tests li:first-child{border-top:0}.linkish{background:none;border:0;padding:0;text-align:left;color:var(--violet);cursor:pointer;font:inherit;font-size:12.5px}.linkish:hover{text-decoration:underline}.prep-row{display:flex;justify-content:space-between;align-items:center;gap:12px;border-top:1px solid var(--line);padding:9px 0}.prep-row:first-of-type{border-top:0}.prep-row label{display:flex;gap:9px;align-items:flex-start;font-size:13.5px;cursor:pointer;margin:0}.prep-row small{display:block;color:var(--muted);font-size:12px;margin-top:2px}.prep-row.done label>span{opacity:.55}.prep-row.done strong{text-decoration:line-through}.card.current-week{border-color:var(--violet);box-shadow:0 0 0 1px var(--violet)}.cal-filters{margin-bottom:6px}#cal-list{display:flex;flex-direction:column;gap:10px;margin-top:8px}.calendar-event{display:grid;grid-template-columns:96px 1fr;gap:14px;border:1px solid var(--line);border-radius:var(--r-md);padding:12px 14px;background:var(--panel)}.calendar-event>time{font-size:12px;font-weight:600;color:var(--muted);white-space:nowrap;padding-top:2px}.calendar-event.today{border-color:var(--violet);box-shadow:0 0 0 1px var(--violet)}.calendar-event.past{opacity:.6}.calendar-event .calendar-body>p{margin:.35em 0}.calendar-event .toolbar{margin-top:8px;align-items:center}@media(max-width:560px){.calendar-event{grid-template-columns:1fr}}.panel,.filter-list,.scroll-y{scrollbar-width:thin;scrollbar-color:transparent transparent}.panel:hover,.filter-list:hover,.scroll-y:hover,.panel:focus-within,.filter-list:focus-within{scrollbar-color:var(--soft-strong) transparent}.panel::-webkit-scrollbar,.filter-list::-webkit-scrollbar,.scroll-y::-webkit-scrollbar{width:11px;height:11px;background:transparent}.panel::-webkit-scrollbar-track,.filter-list::-webkit-scrollbar-track,.scroll-y::-webkit-scrollbar-track{background:transparent;border:0}.panel::-webkit-scrollbar-thumb,.filter-list::-webkit-scrollbar-thumb,.scroll-y::-webkit-scrollbar-thumb{background:transparent;border-radius:var(--r-pill);border:3px solid transparent;background-clip:padding-box;transition:background-color .15s ease}.panel:hover::-webkit-scrollbar-thumb,.filter-list:hover::-webkit-scrollbar-thumb,.scroll-y:hover::-webkit-scrollbar-thumb,.panel:focus-within::-webkit-scrollbar-thumb,.filter-list:focus-within::-webkit-scrollbar-thumb{background-color:var(--soft-strong);background-clip:padding-box}.panel::-webkit-scrollbar-thumb:hover,.filter-list::-webkit-scrollbar-thumb:hover,.scroll-y::-webkit-scrollbar-thumb:hover{background-color:var(--muted);background-clip:padding-box}.panel::-webkit-scrollbar-corner,.filter-list::-webkit-scrollbar-corner{background:transparent}.q-meta-actions{margin-left:auto;display:flex;gap:6px}.btn.ghost{background:transparent;border-color:transparent;color:var(--muted);padding:3px 9px;font-size:11.5px}.btn.ghost:hover{background:var(--soft);color:var(--ink)}.btn.ghost.ok{color:var(--cyan);border-color:var(--cyan)}.review-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:20px 0 10px}.review-head h3{margin:0}.org-head{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;flex-wrap:wrap;margin-bottom:14px}.org-actions{display:flex;gap:6px;align-items:center;flex-wrap:wrap}.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r-md)}.org-table{border-collapse:separate;border-spacing:0;width:100%;font-size:12.5px;min-width:640px}.org-table th,.org-table td{padding:9px 11px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line);line-height:1.4}.org-table thead th{background:var(--soft);font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);white-space:nowrap;position:sticky;top:0}.org-table tbody th{background:var(--soft);font-weight:600;white-space:nowrap;position:sticky;left:0;z-index:1}.org-table tbody tr:last-child th,.org-table tbody tr:last-child td{border-bottom:0}.org-table td[contenteditable]{cursor:text;border-radius:var(--r-sm)}.org-table td[contenteditable]:hover{background:var(--soft)}.org-table td[contenteditable]:focus{outline:none;background:var(--panel);box-shadow:inset 0 0 0 2px var(--violet)}.org-table td.edited{background:var(--violet-soft)}.org-table td.edited:after{content:"\b7 edited";font-size:9.5px;color:var(--violet);display:block;margin-top:2px;letter-spacing:.04em}.org-table .detail-col{font-size:11.5px;white-space:normal;min-width:190px}.contrast{padding:11px 0;border-bottom:1px solid var(--line)}.contrast:last-child{border-bottom:0}.contrast-title{margin:0 0 5px;font-size:14px}.contrast p{margin:3px 0}.badge.wrong-badge{background:var(--rust-soft);color:var(--rust)}.badge{background:var(--cyan-soft);color:var(--cyan)}.flow{margin:0;padding-left:20px}.flow li{margin-bottom:12px}.flow-ask{margin:0 0 4px;font-weight:600;font-size:13.5px}.organizer-layout{display:grid;grid-template-columns:262px minmax(0,1fr);gap:20px;align-items:start}.organizer-rail{position:sticky;top:84px;max-height:calc(100vh - 104px);display:flex;flex-direction:column;gap:8px;overflow:hidden}.organizer-main{min-width:0}.organizer-search{display:flex;align-items:center;gap:7px;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-md);padding:7px 11px}.organizer-search span{color:var(--muted)}.organizer-search input{flex:1;min-width:0;border:0;background:none;color:var(--ink);font:inherit;font-size:13px;outline:none}.organizer-picker{overflow-y:auto;display:flex;flex-direction:column;gap:11px;padding-right:4px}.org-group-name{margin:0 0 5px;font-size:10px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}.org-tiles{display:flex;flex-direction:column;gap:3px}.org-tile{display:flex;flex-direction:column;gap:1px;align-items:flex-start;text-align:left;width:100%;padding:6px 9px;border:1px solid transparent;border-radius:var(--r-sm);background:none;color:var(--ink);font:inherit;font-size:12.5px;cursor:pointer;transition:background .12s}.org-tile:hover{background:var(--soft)}.org-tile-kind{font-size:9.5px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}.org-tile-name{font-weight:600;line-height:1.3}.org-tile-hits{font-size:10px;color:var(--cyan)}.org-tile.active{background:var(--violet-soft);box-shadow:inset 3px 0 0 var(--violet)}.org-tile.active .org-tile-kind{color:var(--violet)}.org-tile.dim{opacity:.38}@media(max-width:860px){.organizer-layout{grid-template-columns:1fr}.organizer-rail{position:static;max-height:none}.organizer-picker{max-height:230px}}.org-hit{background:var(--cyan-soft);color:inherit;border-radius:3px;padding:0 1px}.org-table td.org-cell-hit{box-shadow:inset 0 0 0 1px var(--cyan)}.org-hit-group{padding:9px 0;border-bottom:1px solid var(--line)}.org-hit-group:last-child{border-bottom:0}.org-row-open{display:flex;align-items:center;gap:6px;background:none;border:0;padding:0;color:var(--ink);font:inherit;font-weight:600;cursor:pointer;text-align:left}.org-row-open:hover{color:var(--violet)}.org-expand-row td{background:var(--soft)}.org-expand{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:10px;white-space:normal}.org-expand strong{display:block;font-size:10.5px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}.org-expand p{margin:2px 0 0}.org-see{margin:6px 0 0;color:var(--muted)}.link-btn{background:none;border:0;padding:0;font:inherit;color:var(--violet);cursor:pointer}.link-btn:hover{text-decoration:underline}.org-lab-link{display:inline-block;margin-left:5px;color:var(--violet);text-decoration:none;font-size:11px;white-space:nowrap}.org-lab-link:hover{text-decoration:underline}.scope-banner{display:flex;flex-direction:column;gap:5px;align-items:flex-start;background:var(--violet-soft);border-radius:var(--r-sm);padding:8px 10px;font-size:12px;margin-bottom:8px}.filter-field{margin-bottom:8px;border:1px solid var(--line);border-radius:var(--r-md);background:var(--panel);overflow:hidden}.filter-summary{display:flex;align-items:center;gap:8px;width:100%;padding:8px 10px;background:transparent;border:0;cursor:pointer;font:inherit;font-size:12.5px;color:var(--ink);text-align:left}.filter-summary:hover{background:var(--soft)}.filter-name{color:var(--muted);flex:0 0 auto}.filter-value{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-align:right;color:var(--muted)}.filter-summary.narrowed .filter-value{color:var(--violet);font-weight:600}.filter-caret{flex:0 0 auto;color:var(--muted);font-size:10px;transition:transform .15s ease}.filter-field.open .filter-caret{transform:rotate(180deg)}.filter-field .filter-list{display:none;margin:0;border:0;border-top:1px solid var(--line);border-radius:0;background:var(--soft)}.filter-field.open .filter-list{display:block}.subtabs{display:flex;gap:2px;background:var(--soft);border:1px solid var(--line);border-radius:var(--r-md);padding:3px;margin:0 0 18px;width:fit-content;max-width:100%;flex-wrap:wrap}.subtabs button{border:0;background:transparent;padding:7px 14px;border-radius:var(--r-sm);cursor:pointer;font:inherit;font-size:12.5px;color:var(--muted)}.subtabs button:hover{color:var(--ink)}.subtabs button.active{background:var(--panel);color:var(--ink);box-shadow:0 1px 3px #00000014}.subview{display:none}.subview.active{display:block}.free-panel{margin-top:8px}.q-parts{margin:6px 0 12px;padding-left:22px}.q-parts li{margin:4px 0}.q-figure-pair img{max-width:100%;height:auto;border:1px solid var(--line);border-radius:var(--r-sm);background:#fff}.q-figure-pair.q-figure-wide{flex:1 1 100%;max-width:100%;text-align:center;margin:12px 0}#solution-body{margin-top:12px}.grade-chips{display:flex;gap:8px;margin:6px 0 2px}.grade-chips .chip{border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:999px;padding:6px 14px;cursor:pointer;font-size:13px;font-weight:600}.grade-chips .chip:hover:not(:disabled){border-color:var(--violet)}.grade-chips .chip:disabled{opacity:.6;cursor:default}.grade-chips .chip.correct{border-color:var(--cyan);background:var(--soft)}.grade-chips .chip.wrong{border-color:var(--rust);background:var(--soft)}.choices-multi{display:grid;gap:8px;margin-bottom:12px}.choice.picked{border-color:var(--violet);background:var(--violet-soft)}.choice.picked.wrong{border-color:var(--rust);background:var(--rust-soft)}.choice.picked.correct{border-color:var(--cyan);background:var(--cyan-soft)}.grid-cells{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:14px}.energy-profile-inputs{display:flex;flex-wrap:wrap;gap:12px;margin:10px 0 14px}.energy-profile-inputs .grid-cell{min-width:125px;flex:1}.energy-profile-plot{max-width:680px;margin:12px 0 16px;overflow-x:auto;border:1px solid var(--line);border-radius:10px;padding:8px;background:var(--panel)}.energy-profile-plot svg{display:block;width:100%;min-width:420px;color:var(--muted);font:12px var(--sans)}.bond-select-figure{max-width:720px;margin:10px 0;border:1px solid var(--line);border-radius:10px;padding:8px;background:var(--panel);overflow-x:auto}.bond-select-svg{display:block;width:100%;min-width:500px;height:auto}.bond-select-svg [data-bond-pair]{cursor:pointer;outline:none}.bond-select-svg [data-bond-pair]:focus{stroke:var(--violet);stroke-width:5;stroke-opacity:.35}.bond-select-status{min-height:1.5em;font-size:12px;color:var(--muted)}.hybrid-mark-svg [data-hybrid-atom],.hybrid-mark-svg [data-hybrid-bond]{cursor:pointer;outline:none}.hybrid-mark-svg [data-hybrid-atom]:focus,.hybrid-mark-svg [data-hybrid-bond]:focus{stroke:var(--violet);stroke-width:4;stroke-opacity:.45}.hybrid-delta{font:600 15px var(--sans);fill:var(--violet)}.grid-cell{display:flex;flex-direction:column;gap:5px;font-size:12.5px;color:var(--muted)}.grid-cell input{width:88px;padding:7px 9px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--panel);color:var(--ink);font-size:15px}.grid-cell input.correct{border-color:var(--cyan);background:var(--cyan-soft)}.grid-cell input.wrong{border-color:var(--rust);background:var(--rust-soft)}.draw-toolbar{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:10px}.draw-toolbar .tool.active{background:var(--violet-soft);color:var(--ink);border-color:var(--violet)}.draw-surface{display:inline-grid;place-items:center;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--panel);padding:6px;margin-bottom:12px;max-width:100%}.kit-edit-svg{cursor:pointer;width:100%;max-width:360px;height:auto;touch-action:manipulation}.draw-actions{margin-bottom:0}.canvas-surface{max-width:820px;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;background:var(--panel);box-shadow:var(--shadow);margin-top:8px;touch-action:none}.canvas-surface svg{display:block;width:100%;height:auto;cursor:crosshair;touch-action:none;-webkit-tap-highlight-color:transparent;user-select:none;-webkit-user-select:none}#lab-draw .canvas-surface{max-width:none}#lab-draw-status:empty{display:none}.lab-ok{color:var(--cyan)}.lab-bad{color:var(--rust)}.canvas-tools{display:flex;gap:6px;flex-wrap:wrap;margin-top:6px}.canvas-tool-options{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin-top:6px;padding:8px 10px;border:1px solid var(--line);border-radius:var(--r-md);background:var(--soft)}.canvas-tool-options[hidden]{display:none}.tool-options-label{font-size:12px;font-weight:650;color:var(--muted);margin-right:2px}.tool-options-hint{font-size:11px;color:var(--muted);margin-left:4px}.canvas-tool-options .bond-order-option{min-width:78px;font-weight:650}.canvas-tool-options .charge-option{min-width:36px;font-weight:650}.chain-toggle{display:inline-flex;align-items:center;gap:9px;padding:7px 10px;border:1px solid var(--line);border-radius:var(--r-md);background:var(--panel);color:var(--ink);font:inherit;font-size:12px;font-weight:650;cursor:pointer}.chain-toggle .chain-state{min-width:34px;padding:2px 7px;border-radius:var(--r-pill);background:var(--soft-strong);color:var(--muted);text-align:center;font-size:10px;text-transform:uppercase;letter-spacing:.04em}.chain-toggle.is-on{border-color:var(--violet);background:var(--soft)}.chain-toggle.is-on .chain-state{background:var(--violet);color:#fff}.canvas-elements{display:flex;gap:4px;flex-wrap:wrap;margin-top:6px}.canvas-elements .elem{min-width:34px;padding:5px 8px;font-size:13px;font-weight:600;font-variant-numeric:tabular-nums}.canvas-elements .elem.active,.canvas-tools .tool.active,.chain-toggle.active{background:var(--soft);border-color:var(--violet);color:var(--ink)}.canvas-actions{display:flex;align-items:center;gap:8px;margin-top:10px;flex-wrap:wrap}.build-spacer{flex:1 1 auto}.build-formula{font-variant-numeric:tabular-nums;font-size:13px;letter-spacing:.02em;padding:5px 10px;border-radius:var(--r-md);background:var(--soft);border:1px solid var(--line);color:var(--ink)}.build-formula.muted{color:var(--muted)}.canvas-parts{list-style:none;padding:0;margin:10px 0 0;font-size:13px}.canvas-parts li{padding:4px 0 4px 20px;position:relative}.canvas-parts li:before{position:absolute;left:2px;font-weight:700}.canvas-parts li.ok:before{content:"\2713";color:var(--cyan)}.canvas-parts li.no:before{content:"\2717";color:var(--rust)}.build-answer{margin-top:12px}.build-answer figure{margin:0}.grid-cells-wide{display:grid;grid-template-columns:1fr;gap:8px}.grid-cells-wide .grid-cell{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);align-items:center;gap:10px}.grid-cells-wide select{width:100%;padding:8px 10px;border-radius:var(--r-md);border:1px solid var(--line);background:var(--panel);color:var(--ink);font-size:14px}.grid-cells-wide select.correct{border-color:var(--cyan)}.grid-cells-wide select.wrong{border-color:var(--rust)}@media(max-width:560px){.grid-cells-wide .grid-cell{grid-template-columns:1fr}}.rank-response{display:grid;gap:8px;padding-left:2rem;margin:12px 0 16px;max-width:620px}.rank-response li{padding:8px 10px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--panel);display:flex;align-items:center;justify-content:space-between;gap:12px}.rank-controls{display:flex;gap:5px}.rank-controls .btn{min-width:34px;padding:4px 8px}.rank-controls .btn:disabled{opacity:.4;cursor:default}.formula-response input{width:min(100%,360px)}.arrow-pad{max-width:560px;margin:8px auto 0;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;background:var(--panel);box-shadow:var(--shadow);touch-action:manipulation}.arrow-pad svg{display:block;width:100%;height:auto;cursor:crosshair;user-select:none;-webkit-user-select:none;-webkit-tap-highlight-color:transparent}#arrow-status:empty{display:none}#arrow-status{margin:8px 0 0;min-height:1.2em}@media(max-width:560px){.canvas-actions .btn{flex:1 1 auto}.canvas-elements .elem{min-width:30px;padding:6px}}.source-shot{margin:.5em 0 1em}.source-shot img{display:block;max-width:100%;height:auto;border:1px solid var(--line, rgba(128,128,128,.35));border-radius:6px;background:#fff}.source-shot figcaption{margin-top:.25em}.newman-projection{display:block;width:100%;max-width:500px;margin:0 auto}.newman-preview{overflow:hidden}.exam1-item{border-top:1px solid var(--line);padding:18px 0;break-inside:avoid}.exam1-options{display:grid;gap:10px}.exam1-options label{display:flex;align-items:baseline;gap:10px}.exam1-paper textarea{width:100%;box-sizing:border-box}.exam1-rubric{padding:12px;margin-top:12px;background:var(--panel);border:1px solid var(--line)}.exam1-item svg{max-width:100%;max-height:360px}.exam1-item .q-figure{display:inline-block;width:220px;max-width:48%;height:180px;vertical-align:middle}.problem-search-form{display:flex;gap:8px;margin-top:8px}.problem-search-form input{flex:1;min-width:0}.problem-search-results details{margin:12px 0}.problem-search-list{list-style:none;padding:0}.problem-search-list li{padding:10px 0;border-bottom:1px solid var(--line)}.problem-search-list li>span{display:block}.problem-search-list p{margin:4px 0}.test-rubric{padding:12px;border:1px solid var(--line);margin:12px 0}#test-work-notes{width:100%;box-sizing:border-box}.test-arrow-work{margin:12px 0}.dipole-panel{margin:14px 0 22px}.dipole-panel h4{margin:0 0 8px}.dipole-stage{position:relative;width:100%;max-width:540px;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--panel)}.dipole-diagram,.dipole-overlay{position:absolute;inset:0;width:100%;height:100%}.dipole-diagram>svg{display:block;width:100%;height:100%;max-width:none}.dipole-overlay{touch-action:none;cursor:crosshair}.dipole-overlay:focus-visible{outline:3px solid var(--violet);outline-offset:-3px}.dipole-panel [aria-pressed=true]{border-color:var(--violet)}.dipole-review{margin:12px 0}.dipole-review figcaption{margin-bottom:5px;font-weight:600}.stereo-panel{margin-top:14px}.stereo-panel>summary{cursor:pointer;list-style:none}.stereo-panel>summary h3{display:inline;margin:0}.stereo-block{margin-top:12px;padding-top:10px;border-top:1px solid var(--line, rgba(128,128,128,.25))}.stereo-block h4{margin:0 0 6px;font-size:13px}.stereo-mirror{display:flex;align-items:center;justify-content:space-around;gap:6px}.stereo-mirror figure{margin:0;text-align:center;flex:1;min-width:0}.stereo-mirror figcaption{font-size:11px;color:var(--muted)}.stereo-mirror svg{max-width:100%;height:auto}.stereo-mirror .mline{align-self:stretch;border-left:2px dashed var(--violet);min-height:120px}.stereo-steps{padding-left:18px}.stereo-steps li{margin-bottom:4px}.stereo-swap{margin-top:8px}.stereo-swapnote{color:var(--violet);margin:6px 0 0}.chip-group{font-variant-numeric:tabular-nums}.stereo-family{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:8px}.stereo-iso{display:flex;gap:8px;align-items:center;padding:6px;border:1px solid var(--line, rgba(128,128,128,.25));border-radius:var(--r-md)}.stereo-iso.current{border-color:var(--violet);background:var(--violet-soft)}.stereo-iso svg{width:130px;height:auto}.stereo-result{display:flex;gap:10px;align-items:center;margin-top:8px}.stereo-result-fig svg{width:150px;height:auto}.stereo-smiles{font-size:11px;word-break:break-all}.stereo-block .toolbar input{min-width:0;max-width:100%}.coming-up{border-left:4px solid var(--violet)}.coming-up-list{list-style:none;margin:10px 0 4px;padding:0;display:grid;gap:8px}.coming-up-item{display:grid;grid-template-columns:minmax(150px,200px) 1fr auto;gap:10px 14px;align-items:center;padding:8px 10px;border:1px solid var(--line);border-radius:var(--r-sm)}.coming-up-item.is-today{border-color:var(--violet);background:var(--soft)}.coming-up-item.no-quiz{opacity:.85}.coming-up-when{display:flex;flex-direction:column;gap:2px;align-items:flex-start}@media(max-width:700px){.coming-up-item{grid-template-columns:1fr}}.lab-formula-bar{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin:6px 0 2px}.lab-formula-bar input{flex:1 1 360px;min-width:0;font-size:20px;padding:10px 14px;border:2px solid var(--line);border-radius:var(--r-md);background:var(--panel);color:var(--ink);font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.lab-formula-bar input:focus{outline:none;border-color:var(--accent, #4f6bed)}.lab-text-info{margin:2px 0 8px;min-height:1.4em}.chair-panel{border:1px solid var(--line);border-radius:var(--r-lg);background:var(--panel);padding:12px 14px;margin-bottom:14px}.chair-panel h3{margin:0 0 8px}.chair-table{width:100%;border-collapse:collapse;margin:4px 0 10px}.chair-table th{font-weight:600;text-align:left;color:var(--muted);padding:3px 6px;border-bottom:1px solid var(--line)}.chair-table td{padding:3px 6px;border-bottom:1px solid var(--line)}.chair-table td.ax{color:var(--rust);font-weight:600}.chair-table td.eq{color:var(--cyan);font-weight:600}.chair-warn{color:var(--amber)}#cd-msg.ok{color:var(--cyan);font-weight:600}#lab-chair-draw svg .chair-slot:hover{fill:var(--violet-soft)}.chair-steps{margin-top:10px}.chair-steps-row{display:flex;gap:10px;flex-wrap:wrap;margin:8px 0}.chair-steps-row figure{margin:0;text-align:center}.kit-svg:focus-visible{outline:2px solid var(--violet);outline-offset:2px}.lab-deg{margin-left:6px;font-weight:650;color:var(--ink);font-variant-numeric:tabular-nums}#lab-rotate{width:100%}.lab-steps,.lab-views{display:flex;flex-wrap:wrap;gap:5px;align-items:center;margin-top:7px}.lab-steps .btn.small,.lab-views .btn.small,.pucker-presets .btn.small{font-size:12px;padding:4px 9px}.lab-steps-sep{flex:0 0 8px}.lab-views .btn.active{background:var(--violet);color:#fff;border-color:var(--violet)}.lab-help summary{cursor:pointer;margin-top:6px}.lab-help ul{margin:6px 0 0}.pucker-panel{margin-top:12px;padding:12px;background:var(--soft);border:1px solid var(--line);border-radius:var(--r-md)}.pucker-head{display:flex;flex-wrap:wrap;gap:8px;align-items:baseline;margin-bottom:8px}.pucker-head h3{margin:0}.pucker-presets{display:flex;flex-wrap:wrap;gap:5px;margin-bottom:10px}.pucker-presets .btn:disabled{opacity:.45;cursor:not-allowed}.pucker-body{display:grid;grid-template-columns:minmax(220px,1.3fr) minmax(150px,1fr);gap:14px;align-items:start}@media(max-width:760px){.pucker-body{grid-template-columns:1fr}}.pucker-map svg{display:block;width:100%;height:auto;touch-action:none;cursor:crosshair;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-md)}.pucker-sliders{display:flex;flex-direction:column;gap:5px}.pucker-sliders input[type=range]{width:100%}.pucker-sliders output{margin-left:6px;font-weight:650;color:var(--ink);font-variant-numeric:tabular-nums}.pucker-sliders .btn{align-self:flex-start;margin-top:6px}.pk-field{fill:none;stroke:var(--line)}.pk-pole{stroke:var(--cyan);stroke-width:2.5}.pk-axis{font-size:8.5px;fill:var(--muted)}.pk-label{font-size:9px;fill:var(--cyan);font-weight:600}.pk-boat{fill:var(--rust);opacity:.85}.pk-twist{fill:var(--violet);opacity:.85}.pk-half{fill:#c9a227;opacity:.9}.pk-sofa{fill:var(--muted);opacity:.7}.pk-dot{fill:var(--ink);stroke:var(--panel);stroke-width:2;pointer-events:none}.pk-legend{margin:4px 0 0;line-height:1.7}.pk-key{display:inline-block;width:9px;height:9px;margin:0 3px 0 8px;vertical-align:-1px}.pk-key:first-child{margin-left:0}.pk-key-boat{background:var(--rust)}.pk-key-twist{background:var(--violet);border-radius:50%}.pk-key-half{background:#c9a227;clip-path:polygon(50% 0,100% 100%,0 100%)}.pk-key-sofa{background:var(--muted);transform:rotate(45deg) scale(.8)}.pucker-warn{color:var(--rust)}main:has(#lab.active.ws-on){max-width:none;padding:8px clamp(10px,1.5vw,20px) 0}#lab.active.ws-on{display:flex;flex-direction:column;height:calc(100dvh - 76px);min-height:480px}#lab.ws-on>h1,#lab.ws-on .lab-text-info,#lab.ws-on #lab-error:empty,#lab.ws-on .kit-wrap{display:none}#lab.ws-on #lab-error{margin:0 0 4px}#lab.ws-on .lab-formula-bar{margin:0 0 6px}#lab.ws-on .lab-formula-bar input{font-size:15px;padding:6px 11px;border-width:1px}#lab.ws-on>.toolbar{margin:0 0 8px}.ws{flex:1;min-height:0;display:grid;grid-template-columns:minmax(0,1fr) 410px;gap:10px}.ws.side-collapsed{grid-template-columns:minmax(0,1fr) 62px}.ws.side-collapsed .ws-panes{display:none}.ws-view{min-width:0;min-height:0;display:flex}.ws-viewport{position:relative;flex:1;min-height:0;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}.ws-viewport>#lab-svg{position:absolute;inset:0;width:100%;height:100%;border:0;border-radius:0;background:transparent}.ws-top{position:absolute;top:8px;left:8px;right:48px;z-index:3;pointer-events:none}.ws-top>*{pointer-events:auto}.ws-top .lab-views{margin:0;width:fit-content;max-width:100%;padding:5px 8px;background:color-mix(in srgb,var(--panel) 88%,transparent);border:1px solid var(--line);border-radius:var(--r-md);backdrop-filter:blur(6px)}.ws-collapse{position:absolute;top:8px;right:8px;z-index:3;width:30px;height:30px;border:1px solid var(--line);border-radius:var(--r-md);background:color-mix(in srgb,var(--panel) 88%,transparent);color:var(--muted);cursor:pointer}.ws-collapse:hover{color:var(--ink);border-color:var(--violet)}.ws-inset{position:absolute;right:10px;bottom:38px;width:min(210px,32%);z-index:3;padding:6px;background:color-mix(in srgb,var(--panel) 92%,transparent);border:1px solid var(--line);border-radius:var(--r-md)}.ws-inset svg{display:block;width:100%;height:auto}.ws-toast{position:absolute;left:10px;bottom:38px;max-width:min(520px,60%);z-index:3;padding:8px 11px;background:var(--soft-strong);border:1px solid var(--line);border-left:3px solid var(--violet);border-radius:var(--r-md);font-size:12.5px}.ws-status{position:absolute;left:0;right:0;bottom:0;z-index:2;padding:6px 12px;font-size:12px;color:var(--muted);background:linear-gradient(to top,color-mix(in srgb,var(--panel) 92%,transparent),transparent);pointer-events:none}.ws-status #lab-hint{margin:0}.ws-side{display:flex;gap:6px;min-width:0;min-height:0}.ws-tabs{display:flex;flex-direction:column;gap:4px;flex:0 0 56px}.ws-tab{display:flex;flex-direction:column;align-items:center;gap:1px;padding:8px 2px;border:1px solid transparent;border-radius:var(--r-md);background:transparent;color:var(--muted);font-size:11px;cursor:pointer}.ws-tab .ws-ic{font-size:17px;line-height:1.1}.ws-tab:hover:not(:disabled){background:var(--soft);color:var(--ink)}.ws-tab.active{background:var(--nav-active);color:var(--nav-active-text);border-color:var(--line)}.ws-tab:disabled{opacity:.32;cursor:not-allowed}.ws-tab:focus-visible{outline:2px solid var(--violet);outline-offset:1px}.ws-panes{flex:1;min-width:0;min-height:0;overflow:auto;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-lg);padding:12px;container-type:inline-size}.ws-panes .card,.ws-panes .pucker-panel{margin:0;padding:0;border:0;background:transparent}.ws-panes .toolbar{margin:0 0 8px}#lab-3d-controls{display:flex;flex-wrap:wrap;gap:6px 10px}#lab-3d-controls label{flex:1 1 44%;font-size:12.5px}.ws-empty{margin:0 0 10px}.ws-bondtools,.ws-ringtools{gap:6px}@container (max-width:470px){.pucker-body{grid-template-columns:1fr}.pucker-sliders{display:grid;grid-template-columns:1fr 1fr;gap:2px 12px}.pucker-sliders .btn{grid-column:1/-1}}@media(max-width:900px){#lab.ws-on{height:auto}.ws{grid-template-columns:1fr}.ws-viewport{height:62dvh;flex:none}.ws-view{display:block}.ws-side{flex-direction:column}.ws-tabs{flex-direction:row;flex:none}.ws-tab{flex:1;flex-direction:row;justify-content:center;gap:5px}.ws-panes{max-height:55dvh}.ws.side-collapsed{grid-template-columns:1fr}.ws-collapse{display:none}}.ws-inset{width:min(170px,26%);padding:4px}.ws-inset figcaption{margin:0 0 2px;font-size:10.5px;line-height:1.25}.ws-inset figcaption strong{display:block;font-size:11px}.ws-inset figcaption span{display:none}.ws-inset figure{margin:0}.pucker-notes summary{cursor:pointer}.pucker-notes p{margin:4px 0 0}.ws-panes .pucker-panel{display:flex;flex-direction:column}.ws-panes .pucker-presets{margin-bottom:6px}.ws-panes .pucker-sliders .btn{margin-top:2px}.ws-viewport>#lab-draw{position:absolute;inset:0;overflow:auto;padding:12px 12px 34px}.ws-viewport>#lab-draw .canvas-surface{margin-top:0}.ws[data-mode=draw] .ws-status,.ws[data-mode=chair] .ws-status{background:none}.ws-pane .canvas-actions{flex-wrap:wrap}.ws-pane .build-spacer{flex:1 0 100%}.ws-viewport>#lab-svg{object-fit:contain}#ws-pane-ring{position:relative}.ws-ringtools{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 10px!important}.ws-ringtools .btn,#lab-3d-controls .btn,#lab-live-controls .btn{font-size:12px;padding:4px 9px;white-space:nowrap}.ws-panes .pucker-head{margin-bottom:4px}.ws-panes #lab-3d-controls,.ws-panes #lab-live-controls{display:flex;flex-wrap:wrap;gap:6px 10px;align-items:center;margin:0 0 10px}.ws-panes #lab-live-controls #lab-live-stage{flex:1 0 100%;margin:0;min-height:1.3em}.ws-panes .pucker-sliders{display:grid;grid-template-columns:1fr 1fr;gap:2px 12px}.ws-panes .pucker-sliders .btn{grid-column:1/-1}.ws-panes .pk-legend{margin:2px 0 0;font-size:11.5px}.ws-panes .pucker-body{gap:8px}.ro-fold{margin-top:10px;border-top:1px solid var(--line);padding-top:6px}.ro-fold>summary{cursor:pointer;list-style-position:inside}.ro-fold>summary h3{display:inline;margin:0;font-size:13.5px}#lab-react select{display:block;width:100%;margin:2px 0 8px}#lab-react-player h3{margin:2px 0 4px}#lab-react-text{font-size:13.5px;line-height:1.5;margin:0 0 10px}.react-count{text-transform:uppercase;letter-spacing:.04em;font-size:11px}.ws-top{display:flex;flex-direction:column;align-items:flex-start;gap:6px}.ws-modeswitch{width:fit-content;background:color-mix(in srgb,var(--panel) 88%,transparent);backdrop-filter:blur(6px)}.ws-modeswitch[hidden]{display:none}.lab-box{position:relative;flex:1 1 360px;min-width:0}.lab-box input{width:100%;box-sizing:border-box;padding-right:38px}.lab-browse{position:absolute;top:50%;right:6px;transform:translateY(-50%);width:28px;height:28px;border:0;border-radius:var(--r-sm);background:transparent;color:var(--muted);cursor:pointer;font-size:14px}.lab-browse:hover{background:var(--soft);color:var(--ink)}.lab-box #lab-structure-results{top:100%;left:0;right:0;max-height:60vh;overflow:auto;font-family:inherit}#lab-structure-results li.active{background:var(--soft-strong, var(--soft));outline:1px solid var(--violet)}.lab-modes .btn{font-size:13px}#lab.ws-on .lab-modes .btn{padding:5px 11px}.browse-bar{display:flex;flex-wrap:wrap;gap:10px 14px;align-items:flex-end}.browse-bar label{display:flex;flex-direction:column;gap:3px;font-size:12px;color:var(--muted)}.browse-bar label.check{flex-direction:row;align-items:center;gap:6px}.browse-bar select,.browse-bar input[type=search],.browse-bar input[type=text]{font:inherit;padding:5px 8px;border:1px solid var(--line);border-radius:8px;background:var(--panel,transparent);color:var(--ink)}.browse-bar input.bad{border-color:var(--rust)}.browse-bulk{margin-left:auto}.browse-index summary{cursor:pointer;font-weight:600}.browse-chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}.browse-chip{font-size:12px;padding:2px 8px;border:1px solid var(--line);border-radius:999px;text-decoration:none;color:var(--ink)}.browse-chip.g{border-color:var(--cyan)}.browse-chip.f:after{content:" \25c7";color:var(--violet)}.browse-chip.here{background:var(--violet-soft);border-color:var(--violet)}.browse-pager{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin:10px 0}.browse-count{margin-left:8px}.browse-card{border:1px solid var(--line);border-radius:12px;padding:12px 16px;margin:12px 0;background:var(--panel,transparent)}.browse-card.flash{box-shadow:0 0 0 3px var(--violet)}.browse-card header{display:flex;justify-content:space-between;align-items:baseline;gap:10px}.browse-card h3{margin:0}.browse-card h3 small{font-weight:400;color:var(--muted);font-size:.65em}.browse-badges .badge{margin-left:6px}.badge.warn{background:var(--rust-soft);color:var(--rust)}.browse-q p{margin:6px 0}.browse-ref{margin:8px 0;padding:6px 12px;border-left:3px solid var(--violet);background:var(--violet-soft);border-radius:0 8px 8px 0;font-size:.95em}.browse-figs{display:flex;flex-wrap:wrap;gap:12px;margin:8px 0}.browse-figs figure{margin:0;max-width:260px}.browse-figs svg{width:100%;height:auto}.browse-figs figcaption{font-size:11px;color:var(--muted)}.browse-actions{display:flex;gap:8px;margin:8px 0}.browse-sol{background:var(--cyan-soft);border-left:4px solid var(--cyan);border-radius:8px;padding:2px 14px 10px;margin:8px 0}.browse-sol h4{margin:8px 0 4px}.browse-src{margin:6px 0 0}.omni-button{margin-left:6px;cursor:pointer;font:inherit;border:1px solid var(--line)!important}.omni{position:fixed;inset:0;z-index:1000;display:flex;align-items:flex-start;justify-content:center;padding:10vh 12px 0}.omni[hidden]{display:none}.omni-backdrop{position:absolute;inset:0;background:#0a0a148c;backdrop-filter:blur(2px)}.omni-panel{position:relative;width:min(720px,100%);max-height:78vh;display:flex;flex-direction:column;background:var(--panel,#1b1a24);color:var(--ink);border:1px solid var(--line);border-radius:14px;box-shadow:0 18px 60px #00000073;overflow:hidden}.omni-input{font:inherit;font-size:17px;padding:14px 18px;border:0;border-bottom:1px solid var(--line);background:transparent;color:var(--ink);outline:none;width:100%;box-sizing:border-box}.omni-results{overflow:auto;padding:6px 8px 10px;flex:1}.omni-section h4{margin:10px 10px 4px;font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}.omni-item{display:flex;flex-direction:column;gap:2px;padding:8px 12px;border-radius:8px;text-decoration:none;color:var(--ink)}.omni-item.active,.omni-item:hover{background:var(--violet-soft)}.omni-label{font-weight:600}.omni-detail{font-size:12.5px;color:var(--muted)}.omni-empty{padding:16px}.omni-hint{margin:0;padding:8px 14px;border-top:1px solid var(--line)}.omni-hint kbd{font-size:11px;border:1px solid var(--line);border-radius:4px;padding:0 5px;margin:0 2px}body.omni-open{overflow:hidden}.lab-seg{margin:0 0 8px}.lab-seg .seg{display:inline-flex}.browse-cap{margin:8px 0 2px}.browse-actions{flex-wrap:wrap}.browse-scans summary{cursor:pointer;color:var(--muted);font-size:13px;margin-top:6px}.scan-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;margin-top:8px}.scan-grid a{display:flex;flex-direction:column;gap:3px;text-decoration:none;color:var(--muted);font-size:11px}.scan-grid img{width:100%;height:120px;object-fit:cover;object-position:top;border:1px solid var(--line);border-radius:6px;background:#fff}.cd-row{display:flex;flex-wrap:wrap;gap:10px;align-items:flex-start}.cd-row svg{flex:1 1 220px;min-width:200px;max-width:420px}#cd-planar{max-width:260px}.pucker-auto{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:6px 0}.pucker-auto select{font:inherit;padding:3px 6px;border:1px solid var(--line);border-radius:6px;background:transparent;color:var(--ink)}#lab-ring-tour{margin-left:8px}#lab-ws[data-mode=live] #lab-pucker-spin{display:none}.ws-panes #lab-2d-controls,.ws-panes #lab-3d-controls{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:6px;align-items:stretch;margin:0 0 14px}.ctl-head{grid-column:1/-1;margin:8px 0 0;font-size:10.5px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--muted)}.ctl-head:first-child{margin-top:0}.ws-panes .toolbar.small label,.ws-panes #lab-live-controls label:has(input[type=checkbox]){display:flex;align-items:center;gap:8px;min-height:32px;padding:5px 9px;border:1px solid var(--line);border-radius:8px;background:var(--soft);color:var(--ink);font-size:12.5px;line-height:1.25;cursor:pointer}.ws-panes .toolbar.small label:has(input:checked),.ws-panes #lab-live-controls label:has(input:checked){border-color:color-mix(in srgb,var(--ink) 45%,var(--line));background:var(--soft-strong)}.ws-panes .toolbar.small label input[type=checkbox]{flex:none;margin:0}.ws-panes #lab-2d-controls .btn,.ws-panes #lab-3d-controls .btn{width:100%;justify-content:center;text-align:center}.ws-panes .pucker-head{flex-wrap:nowrap;align-items:center;gap:8px}.pucker-head .badge{min-width:0;max-width:62%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.pucker-energy{margin:0 0 8px;height:1.5em;line-height:1.5em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.pucker-source{margin:10px 0 0;font-size:11.5px;line-height:1.45}.tour-head{display:flex;justify-content:space-between;align-items:baseline;gap:8px;margin-bottom:8px}.tour-head h3{margin:0}.tour-card{display:flex;flex-direction:column;gap:12px;min-height:200px;padding:18px;border:1px solid var(--line);border-radius:var(--r-lg);background:var(--soft);cursor:pointer;user-select:none;transition:background .15s,border-color .15s}.tour-card.flipped{background:var(--panel);border-color:color-mix(in srgb,var(--ink) 40%,var(--line))}.tour-card:focus-visible{outline:2px solid var(--ink);outline-offset:2px}.tour-q{font-size:16px;font-weight:650;line-height:1.35;color:var(--ink)}.tour-a{border-top:1px dashed var(--line);padding-top:12px;font-size:14px;line-height:1.5;color:var(--ink)}.tour-ans{display:block;font-weight:600}.tour-why{display:block;margin-top:8px}.tour-nav{display:grid;grid-template-columns:1fr 1.5fr 1fr;gap:6px;margin:10px 0 18px}.ws-panes .ws-ringtools{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:6px;margin:0 0 14px!important}.ws-panes .ws-ringtools .btn{width:100%;white-space:normal;text-align:center}.ws-panes #lab-live-controls{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:6px;align-items:stretch;margin:14px 0}.ws-panes #lab-live-controls .seg{grid-column:span 2;display:flex}.ws-panes #lab-live-controls .seg .btn{flex:1}.ws-panes #lab-live-controls>label,.ws-panes #lab-live-controls #lab-live-stage{grid-column:1/-1}.ws-panes #lab-live-controls .btn{width:100%;justify-content:center}.ws-panes #lab-live-controls label:has(select){display:flex;align-items:center;gap:8px;justify-content:space-between}