body{font-family:system-ui;margin:0;background:#f6f7fb;color:#172033}.wrap{max-width:900px;margin:auto;padding:20px}.card{background:white;border-radius:14px;padding:18px;margin:14px 0;box-shadow:0 2px 12px #0001}textarea{width:100%;height:300px;font:15px ui-monospace,SFMono-Regular,Menlo,monospace;line-height:1.45;padding:14px;box-sizing:border-box;tab-size:4;border:0;outline:0;resize:vertical;background:#101827;color:#eee;border-radius:0 0 10px 10px}button,select{padding:10px 15px;margin:6px 6px 6px 0}pre{white-space:pre-wrap;background:#101827;color:#eee;padding:14px;border-radius:10px}.muted{color:#687386}.status{font-size:13px;color:#687386}.passed{color:#16803a;font-weight:700}.review{display:none;background:#eef8f0;color:#172033;border:1px solid #b9dfc3}.afterPass{display:none;background:#f3f8ff;border:1px solid #c8d9ee;border-radius:10px;padding:12px;margin-top:10px}.afterPass.show{display:block}.interviewRow{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:8px 0}.interviewRow select{margin:0}.altCode{height:150px;margin-top:6px}.checkResult{font-size:13px;margin:6px 0}.reflectQ{font-weight:700;margin:7px 0}.reflectHint{font-size:13px;color:#687386}.history{font-size:14px;line-height:1.5}.topline{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.topline h1{margin:0}.authline{margin-left:auto}.tag{display:inline-block;padding:3px 8px;border-radius:999px;background:#eef1f6;font-size:12px;margin-right:6px}.locked{opacity:.55}.sample{display:none}.hidden{display:none!important}.navMenu{position:relative;margin-left:auto}.navToggle{width:38px;height:36px;padding:0;margin:0;font-size:21px;line-height:1}.navPanel{display:none;position:absolute;right:0;top:40px;background:#fff;border:1px solid #d8dde3;border-radius:10px;box-shadow:0 5px 18px #0002;min-width:210px;padding:6px;z-index:20}.navPanel.show{display:block}.navItem,.navSub summary{display:block;width:100%;box-sizing:border-box;padding:9px 10px;border:0;background:transparent;text-align:left;font:inherit;cursor:pointer;border-radius:7px}.navItem:hover,.navSub summary:hover{background:#f1f4f8}.navSub summary{list-style:none}.navSub summary::-webkit-details-marker{display:none}.navSub summary:after{content:"›";float:right}.navSub[open] summary:after{content:"⌄"}.navSubItems{padding-left:12px}.navCheck:before{content:"✓";display:inline-block;width:20px;visibility:hidden}.navCheck.selected:before{visibility:visible}.topline{min-height:38px}.topline h1{font-size:22px}.authline{display:none}.difficulty{font-size:12px;font-weight:700}.mastery{font-size:12px}.compactDash{display:none}.dashboard{display:grid;grid-template-columns:repeat(auto-fit,minmax(145px,1fr));gap:8px}.skill{background:#f6f7fb;border-radius:10px;padding:9px}.bar{height:6px;background:#dde2ea;border-radius:5px;overflow:hidden;margin-top:5px}.fill{height:100%;background:#172033}.next{font-weight:700}.learnbox{display:none;background:#fff8e8;border:1px solid #ead7a4;border-radius:10px;padding:12px;margin-top:10px}.learnbox.show{display:block}.learnVisual{background:#fff;border:1px solid #e1e5ea;border-radius:12px;padding:14px;margin:8px 0 14px;overflow:auto}.learnVisual svg{display:block;max-width:100%;height:auto;margin:auto}.learnVisual .mermaid{min-width:280px;text-align:center}.vizRow{display:flex;align-items:flex-end;justify-content:center;gap:7px;min-width:300px;padding:14px 4px}.vizCell{min-width:42px;height:42px;border:2px solid #8ea2bd;border-radius:8px;display:flex;align-items:center;justify-content:center;background:#f8fbff;font-weight:700;position:relative}.vizCell.active{border-color:#335f9e;background:#e8f1ff}.vizCell.good{border-color:#4b9b68;background:#e9f8ee}.vizMark{position:absolute;top:48px;font-size:11px;font-weight:800;white-space:nowrap}.vizArrow{font-size:22px;color:#687386}.vizStack{display:flex;flex-direction:column-reverse;align-items:center;gap:5px;padding:8px}.vizStack .vizCell{width:100px}.vizKV{display:grid;grid-template-columns:auto auto;gap:6px;justify-content:center}.vizKV span{border:1px solid #aab6c5;padding:7px 12px;border-radius:7px;background:#f8fbff}.vizCaption{text-align:center;font-size:12px;color:#687386;margin-top:8px}.statusline{display:flex;gap:7px;flex-wrap:wrap;align-items:center;margin:7px 0}.pill{font-size:12px;padding:3px 8px;border-radius:999px;background:#eef1f6}.mapWrap{overflow:auto;padding:14px 0}.mermaidGraph{min-width:720px;text-align:center}.mermaidGraph svg{max-width:100%;height:auto}.mermaidGraph .node{cursor:pointer}.mermaidGraph .node:hover{filter:brightness(.97)}.concept.done{font-weight:700}.mastered{background:#dcfce7!important;border-color:#86d49b!important}.learning{background:#fff4cc!important;border-color:#e4c765!important}.available{background:#e8f1ff!important;border-color:#9ab9e8!important}.lockedConcept{background:#f1f3f5!important;border-color:#d8dde3!important;color:#7a8491!important}.questionList{margin-top:12px}.questionList button{padding:7px 10px}.guideCard{display:none}.guideCard.show{display:block}.guideSteps{margin:8px 0 0;padding-left:22px;line-height:1.55}.guideSteps li{margin:7px 0}.editorShell{background:#101827;border-radius:10px;overflow:hidden;border:1px solid #243044}.editorTop{height:42px;display:flex;align-items:center;justify-content:space-between;padding:0 8px 0 14px;color:#aeb8c8;font-size:12px;border-bottom:1px solid #263246}.runPrimary{margin:0;padding:7px 16px;border:0;border-radius:7px;background:#22c55e;color:#07140b;font-weight:800;cursor:pointer}.runPrimary:hover{filter:brightness(.95)}.editorHelp{margin:7px 2px 2px}.toolRow{display:flex;gap:2px;flex-wrap:wrap}.sectionHead{display:flex;align-items:center;justify-content:space-between;gap:12px}.collapseBtn{font-size:12px;padding:5px 9px;margin:0;background:#f6f7fb;border:1px solid #d8dde3;border-radius:7px;cursor:pointer}.collapsed .collapsibleBody{display:none}.collapsed .collapseBtn:after{content:"d"}.collapsed .collapseBtn{font-size:0}.collapsed .collapseBtn:after{content:"Expand";font-size:12px}@media(max-width:600px){.wrap{padding:12px}.card{padding:14px}.editorTop{height:40px}textarea{height:270px}.toolRow button{padding:9px 11px}}