:root{--bg:#f7f6f2;--panel:#fff;--ink:#1a1d24;--muted:#6b7280;--rule:#e7e5df;--accent:#c65d21;--accent-soft:#f2d9c8;--link-path:#c65d21;--node-success:#1d6fa4;--node-failure:#b45309;--cm-correct:#2f855a;--cm-error:#b03a2e;--shadow:0 1px 2px #1012170f, 0 6px 20px #1012170d;--mono:ui-monospace, "SF Mono", Menlo, Consolas, "Roboto Mono", monospace;--sans:Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif}*{box-sizing:border-box}html,body{background:var(--bg);height:100%;color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased;margin:0;font-size:14px;line-height:1.45}.app-header{border-bottom:1px solid var(--rule);background:var(--panel);justify-content:space-between;align-items:center;gap:24px;padding:14px 22px;display:flex}.brand{align-items:baseline;gap:10px;display:flex}.brand h1{letter-spacing:-.01em;margin:0;font-size:18px;font-weight:600}.brand-mark{color:var(--accent);font-size:18px;line-height:1}.tagline{color:var(--muted);font-size:12px}.tab-nav{align-items:center;gap:4px;display:flex}.tab-btn{font-family:var(--sans);color:var(--muted);cursor:pointer;background:0 0;border:1px solid #0000;border-radius:6px;padding:6px 14px;font-size:13px;font-weight:500;transition:background .12s,color .12s,border-color .12s}.tab-btn:hover{background:var(--bg);color:var(--ink)}.tab-btn.active{background:var(--accent-soft);color:var(--accent);border-color:var(--accent-soft)}.about-container{max-width:860px;margin:0 auto;padding:28px 22px 40px}.about-content{background:var(--panel);box-shadow:var(--shadow);color:var(--ink);border-radius:10px;padding:32px 40px;font-size:14px;line-height:1.7}.about-content h1{color:var(--ink);margin:0 0 20px;font-size:22px;font-weight:700}.about-content h2{color:var(--ink);text-transform:none;letter-spacing:normal;margin:28px 0 10px;font-size:16px;font-weight:600}.about-content h3{color:var(--ink);margin:20px 0 8px;font-size:14px;font-weight:600}.about-content p{margin:0 0 14px}.about-content ul,.about-content ol{margin:0 0 14px;padding-left:24px}.about-content li{margin-bottom:6px}.about-content code{font-family:var(--mono);background:var(--bg);color:var(--accent);border-radius:3px;padding:1px 5px;font-size:12.5px}.about-content pre{background:var(--bg);border-radius:6px;margin:0 0 14px;padding:14px 16px;overflow-x:auto}.about-content pre code{color:var(--ink);background:0 0;padding:0}.about-content table{border-collapse:collapse;width:100%;margin:0 0 18px;font-size:13px}.about-content th{text-align:left;border-bottom:2px solid var(--rule);color:var(--muted);text-transform:uppercase;letter-spacing:.06em;padding:8px 12px;font-size:11px;font-weight:600}.about-content td{border-bottom:1px solid var(--rule);vertical-align:top;padding:8px 12px}.about-content tr:last-child td{border-bottom:none}.about-content hr{border:none;border-top:1px solid var(--rule);margin:28px 0}.about-content strong{font-weight:600}.about-content em{color:var(--muted);font-style:italic}.controls{align-items:center;gap:14px;display:flex}.controls label{color:var(--muted);text-transform:uppercase;letter-spacing:.04em;align-items:center;gap:8px;font-size:12px;display:flex}.controls select{font-family:var(--sans);border:1px solid var(--rule);background:var(--bg);color:var(--ink);border-radius:6px;min-width:280px;padding:6px 10px;font-size:13px}.badge{letter-spacing:.06em;text-transform:uppercase;background:var(--accent-soft);color:var(--accent);border-radius:999px;padding:4px 8px;font-size:11px;font-weight:600}.layout{grid-template-columns:1fr 340px;gap:16px;height:calc(100vh - 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