:root{color-scheme:light;--bg:#f4f6fb;--bg-card:#ffffff;--bg-side:#ffffff;--bg-hover:#eef1f8;--text:#1c2333;--text-soft:#5b6478;--text-faint:#8d94a7;--border:#e3e7f0;--primary:#4f46e5;--primary-soft:#eef0ff;--primary-text:#4338ca;--danger:#dc2626;--danger-soft:#fdecec;--ok:#16a34a;--ok-soft:#e9f9ef;--star:#f59e0b;--code-bg:#eef1f7;--shadow:0 1px 3px rgba(28,35,51,.07),0 8px 24px rgba(28,35,51,.06);--shadow-lg:0 12px 40px rgba(28,35,51,.18);--radius:12px}[data-theme=dark]{color-scheme:dark;--bg:#0f131f;--bg-card:#171d2e;--bg-side:#131828;--bg-hover:#1f2639;--text:#e7eaf3;--text-soft:#a7aec2;--text-faint:#6e7689;--border:#262e44;--primary:#818cf8;--primary-soft:#232a4d;--primary-text:#b3bcff;--danger:#f87171;--danger-soft:#3a2027;--ok:#4ade80;--ok-soft:#142e21;--code-bg:#232b41;--shadow:0 1px 3px rgba(0,0,0,.4);--shadow-lg:0 12px 40px rgba(0,0,0,.55)}*{box-sizing:border-box}body,html{height:100%}body{margin:0;font-family:Sarabun,-apple-system,Segoe UI,Roboto,Noto Sans 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8px}.step-zone{position:relative;height:50px}.step-line{position:absolute;top:34px;border-top:2px dashed var(--primary)}.step-arrow{top:-7px;color:var(--primary);line-height:1}.step-arrow,.step-label{position:absolute;font-size:12px}.step-label{top:-36px;left:50%;transform:translateX(-50%);white-space:nowrap;font-weight:700;color:var(--primary-text);background:var(--primary-soft);border-radius:6px;padding:1px 8px}.step-pill{display:flex;justify-content:center;padding:2px 0 4px}.step-pill .step-label{position:static;transform:none}.step-note{margin-top:2px;font-size:12.5px;color:var(--text-soft);text-align:center;line-height:1.55}.answer .md-code,.md .md-code{margin:8px 0;padding:10px 12px;line-height:1.65;white-space:pre}.answer .md-code,.demo-log,.md .md-code{background:#0d1117;color:#c9d1d9;border-radius:8px;overflow-x:auto;font-family:Menlo,Consolas,monospace;font-size:12px}.demo-log{margin-top:12px;padding:8px 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12px;background:#0d1117;color:#c9d1d9;border-radius:8px;overflow-x:auto;font-family:Menlo,Consolas,monospace;font-size:12px;line-height:1.65;white-space:pre}.d3-wrap{position:relative;height:360px;border-radius:12px;overflow:hidden;border:1px solid var(--border);background:radial-gradient(1200px 500px at 70% -10%,rgba(99,102,241,.1),transparent 60%),linear-gradient(180deg,#eef2f7,#dde5ee);touch-action:none}[data-theme=dark] .d3-wrap{background:radial-gradient(1200px 500px at 70% -10%,rgba(99,102,241,.18),transparent 60%),linear-gradient(180deg,#10161f,#0a0e14)}.d3-wrap canvas{display:block;touch-action:none}.d3-label{position:absolute;left:0;top:0;pointer-events:none;font-size:11.5px;font-weight:700;white-space:nowrap;color:var(--text);background:color-mix(in srgb,var(--bg-card) 88%,transparent);border:1px solid var(--border);border-radius:6px;padding:1px 7px;transition:opacity .3s ease;will-change:transform}.d3-label.zone{font-size:12px;background:color-mix(in srgb,var(--bg-card) 92%,transparent);box-shadow:0 2px 8px rgba(0,0,0,.12)}.d3-label.gold{color:#b45309;border-color:#f0c24b}[data-theme=dark] .d3-label.gold{color:#fde68a}.d3-label.green{color:#047857;border-color:#6ee7b7}[data-theme=dark] .d3-label.green{color:#a7f3d0}.d3-step{margin-top:12px}.d3-step-label{font-size:13.5px;font-weight:700;color:var(--primary-text)}.d3-fallback{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;padding:20px;text-align:center;color:var(--text-soft);font-size:13px}@media (max-width:900px){.d3-wrap{height:280px}}.quiz-shell{max-width:860px;margin:0 auto;padding:24px 18px 60px}.quiz-topbar{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:18px;flex-wrap:wrap}.quiz-topbar h1{font-size:22px;margin:0}.quiz-topbar .theme-toggle{border:1px solid var(--border);background:var(--bg-card);color:var(--text);border-radius:8px;padding:6px 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button,.quiz-count-row select{border:1px solid var(--border);background:var(--bg-card);color:var(--text);border-radius:8px;padding:7px 12px;font:inherit;cursor:pointer}.quiz-progress{height:8px;border-radius:99px;background:var(--bg-hover);overflow:hidden;margin-bottom:16px}.quiz-progress>div{height:100%;background:var(--primary);border-radius:99px;transition:width .3s ease}.quiz-card{border:1px solid var(--border);border-radius:14px;background:var(--bg-card);padding:18px 20px}.quiz-q{font-size:16px;font-weight:700;line-height:1.6;margin-bottom:12px}.quiz-code{margin:0 0 12px;padding:12px 14px;background:#0d1117;color:#c9d1d9;border-radius:10px;overflow-x:auto;font-family:Menlo,Consolas,monospace;font-size:12.5px;line-height:1.7;white-space:pre}.choices{display:grid;grid-gap:8px;gap:8px}.choice{display:flex;gap:10px;align-items:flex-start;border:1.5px solid var(--border);border-radius:10px;background:var(--bg);color:var(--text);padding:10px 14px;font:inherit;font-size:14px;text-align:left;line-height:1.55;cursor:pointer;transition:border-color .15s ease,background .15s ease}.choice:hover:not(:disabled){border-color:var(--primary)}.choice:disabled{cursor:default}.choice .ch-letter{flex:none;font-weight:800;font-size:12px;border:1px solid var(--border);border-radius:6px;width:22px;height:22px;display:inline-flex;align-items:center;justify-content:center;margin-top:1px}.choice.correct{border-color:#22c55e;background:#f0fdf4}.choice.correct .ch-letter{background:#22c55e;border-color:#22c55e;color:#fff}.choice.wrong{border-color:#ef4444;background:#fef2f2}.choice.wrong .ch-letter{background:#ef4444;border-color:#ef4444;color:#fff}.choice.dimmed{opacity:.55}[data-theme=dark] .choice.correct{background:#0a2e1a}[data-theme=dark] .choice.wrong{background:#3b1214}.choice code,.quiz-explain code,.quiz-q code{font-family:Menlo,Consolas,monospace;font-size:.92em;background:rgba(125,125,152,.16);border-radius:4px;padding:1px 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.ok{color:#047857;font-weight:700}.review-item .bad{color:#dc2626;font-weight:700}[data-theme=dark] .review-item .ok{color:#6ee7b7}[data-theme=dark] .review-item .bad{color:#fca5a5}.btn-quiz{border:1px solid var(--primary);background:var(--primary);color:#fff;border-radius:10px;padding:8px 16px;font:inherit;font-weight:700;cursor:pointer}.btn-quiz.ghost{background:transparent;color:var(--primary-text)}.quiz-link{display:block;margin-top:8px;font-size:13px;font-weight:700;text-decoration:none;color:var(--primary-text);background:var(--primary-soft);border:1px solid var(--primary);border-radius:8px;padding:7px 10px;text-align:center;transition:transform .15s ease}.quiz-link:hover{transform:translateY(-1px)}@media (max-width:900px){.app{grid-template-columns:1fr;height:auto}.sidebar{border-right:none;border-bottom:1px solid var(--border)}.main{height:auto}.topbar{position:static;flex-wrap:wrap}.search{order:-1;flex-basis:100%}.list{padding:10px 14px 40px}.answer{padding-left:24px}.two-col{grid-template-columns:1fr}}