:root{--bg:#f5f6f8;--card:#fff;--text:#14171b;--muted:#6b7280;--line:#e5e7eb;--accent:#111827;--warn:#9a6700;--danger:#b42318}
*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text)}
header{padding:16px 22px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;gap:12px}header h1{font-size:20px;margin:0}header p{margin:5px 0 0;color:var(--muted);font-size:13px}.mvp{font-size:11px;font-weight:700;padding:5px 8px;border:1px solid var(--line);border-radius:999px}
.app{display:grid;grid-template-columns:390px 1fr;gap:16px;padding:16px;max-width:1540px;margin:auto}.panel,.viewer{background:var(--card);border:1px solid var(--line);border-radius:14px}.panel{padding:16px}.viewer{min-height:760px;overflow:hidden;position:relative}
.section{padding:0 0 16px;margin:0 0 16px;border-bottom:1px solid var(--line)}.section:last-of-type{border-bottom:0}.section h2{font-size:15px;margin:0 0 12px}.row{display:grid;grid-template-columns:1fr 1fr;gap:10px}.actions{display:grid;grid-template-columns:1fr 1fr;gap:8px}.field{margin-bottom:10px}.field label{display:block;font-size:12px;color:var(--muted);margin-bottom:5px}.field input,.field select,.vertex-editor input{width:100%;padding:9px 10px;border:1px solid #d5d9df;border-radius:9px;background:white;color:var(--text)}.topgap{margin-top:10px}
.btn{width:100%;padding:10px 12px;border:0;border-radius:9px;background:var(--accent);color:#fff;cursor:pointer;font-weight:650}.btn.secondary{background:#eef0f3;color:#1c2430}.btn:disabled{opacity:.42;cursor:not-allowed}.status{font-size:12px;color:var(--muted);margin-top:8px;line-height:1.55;padding:10px;background:#f7f8fa;border-radius:9px}.warn{color:var(--warn)}.error{color:var(--danger)}
.mode-group{display:grid;grid-template-columns:1fr 1fr;gap:8px}.mode{padding:9px;border:1px solid var(--line);border-radius:9px;background:#fff;cursor:pointer}.mode.active{border-color:#111827;box-shadow:0 0 0 1px #111827 inset}.stats{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:10px}.stat{padding:10px;background:#f7f8fa;border-radius:9px}.stat b{display:block;font-size:16px}.stat span{font-size:11px;color:var(--muted)}
.edge-cuts{font-size:12px;line-height:1.55;margin-top:9px;color:#374151}.edge-cuts strong{color:#111827}.small{font-size:11px;color:var(--muted);line-height:1.5}.vertex-editor{margin-top:10px;max-height:210px;overflow:auto}.vertex-row{display:grid;grid-template-columns:30px 1fr 1fr;gap:6px;align-items:center;margin-bottom:6px}.vertex-row span{font-size:11px;color:var(--muted)}
.range-line{display:grid;grid-template-columns:50px 1fr 72px;gap:8px;align-items:center;margin:7px 0}.range-line input[type=range]{width:100%}.range-line input[type=number]{width:72px;padding:5px;border:1px solid #d5d9df;border-radius:7px}.export-section{margin-bottom:8px}
.canvas-toolbar{display:flex;gap:8px;padding:12px;border-bottom:1px solid var(--line);align-items:center;flex-wrap:wrap}.badge{font-size:12px;padding:5px 8px;background:#f1f2f4;border-radius:999px}.canvas-wrap{height:690px;background:#eceff2;display:flex;align-items:center;justify-content:center;padding:20px}svg{width:100%;height:100%;background:white;border-radius:8px;box-shadow:0 4px 25px rgba(0,0,0,.06)}.vertex{fill:#111827;stroke:#fff;stroke-width:8;cursor:move}.room-outline{fill:none;stroke:#111827;stroke-width:12;vector-effect:non-scaling-stroke}.dim-label{font-size:45px;fill:#111827;paint-order:stroke;stroke:#fff;stroke-width:8px;stroke-linejoin:round}.tile-grid{stroke:rgba(0,0,0,.32);stroke-width:3;vector-effect:non-scaling-stroke}.grid-origin{stroke:#d92d20;stroke-width:8;vector-effect:non-scaling-stroke}.origin-dot{fill:#d92d20;stroke:#fff;stroke-width:6}.viewer-note{padding:10px 14px;border-top:1px solid var(--line);font-size:11px;color:var(--muted)}
@media(max-width:950px){header{position:static}.app{grid-template-columns:1fr;padding:10px}.viewer{min-height:570px}.canvas-wrap{height:520px;padding:10px}.panel{order:1}.viewer{order:2}}