:root{--bg: #0f1115;--panel: #171a21;--panel2: #1f232d;--line: #2a2f3a;--ink: #e7e9ee;--muted: #9aa3b2;--brand: #6ea8fe;--brand2: #8b5cf6;--green: #4ade80;--red: #f87171;--amber: #fbbf24;--radius: 12px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 -apple-system,Segoe UI,Roboto,sans-serif}a{color:var(--brand);cursor:pointer;text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3{line-height:1.2}.muted{color:var(--muted)}.small{font-size:13px}.row{display:flex;gap:12px;align-items:center}.row.wrap{flex-wrap:wrap}.spread{justify-content:space-between}.grid{display:grid;gap:16px}.grid.cards{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;border-bottom:1px solid var(--line);background:var(--panel);position:sticky;top:0;z-index:5}.brand{font-weight:700;font-size:18px;letter-spacing:.3px}.brand span{color:var(--brand)}.container{max-width:1040px;margin:0 auto;padding:24px 20px 80px}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px}.card+.card{margin-top:16px}.card.auth{max-width:380px;margin:60px auto}label{display:block;margin:10px 0;font-size:13px;color:var(--muted)}input,select,textarea{width:100%;margin-top:4px;background:var(--panel2);border:1px solid var(--line);color:var(--ink);border-radius:8px;padding:9px 11px;font:inherit}textarea{min-height:90px;resize:vertical}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand)}button{background:var(--panel2);color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:9px 14px;font:inherit;cursor:pointer}button:hover{border-color:var(--brand)}button.primary{background:linear-gradient(135deg,var(--brand),var(--brand2));border:none;color:#fff;font-weight:600}button.ghost{background:transparent}button:disabled{opacity:.5;cursor:default}button.danger{color:var(--red)}.pill{display:inline-block;padding:2px 10px;border-radius:999px;font-size:12px;border:1px solid var(--line)}.pill.green{color:var(--green);border-color:#2c5}.pill.amber{color:var(--amber)}.pill.red{color:var(--red)}.pill.blue{color:var(--brand)}.notice{background:#1d2740;border:1px solid #2d3b5e;padding:10px 12px;border-radius:8px;color:#cdd7ef}.error{color:var(--red)}table.data{width:100%;border-collapse:collapse}table.data th,table.data td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);font-size:14px}table.data th{color:var(--muted);font-weight:600}.chips{display:flex;flex-wrap:wrap;gap:8px}.chip{padding:5px 10px;border:1px solid var(--line);border-radius:999px;cursor:pointer;font-size:13px}.chip.on{background:var(--brand);color:#04102a;border-color:var(--brand);font-weight:600}.board{background:#11131a;border:1px solid var(--line);border-radius:var(--radius);min-height:420px;padding:24px 28px}.board .step{opacity:0;transform:translateY(6px);animation:reveal .45s ease forwards;margin:10px 0}@keyframes reveal{to{opacity:1;transform:none}}.board h2.b-title{font-size:26px;margin:0 0 6px}.board h3.b-heading{font-size:18px;color:var(--brand);margin:18px 0 4px}.board .b-line.ink{color:var(--ink)}.board .b-line.blue{color:var(--brand)}.board .b-line.red{color:var(--red)}.board .b-line.green{color:var(--green)}.board .b-line.purple{color:var(--brand2)}.board .b-line.muted{color:var(--muted)}.board .b-line.sm{font-size:13px}.board .b-line.lg{font-size:20px;font-weight:600}.board .callout{border-left:3px solid var(--brand);background:#151a26;padding:10px 14px;border-radius:6px}.board .callout.warn{border-color:var(--amber)}.board .callout.key{border-color:var(--green)}.board .callout.example{border-color:var(--brand2)}.board .eqn{font-family:JetBrains Mono,ui-monospace,monospace;background:#0c0e14;border-radius:6px;padding:10px 14px}.board .eqn .why{color:var(--muted);font-size:12px;margin-left:10px}.board pre.code{background:#0c0e14;border:1px solid var(--line);border-radius:6px;padding:12px;overflow:auto;font-family:ui-monospace,monospace;font-size:13px}.board .result{border:2px solid var(--green);border-radius:8px;padding:10px 14px;font-weight:600}.board .annotate{color:var(--muted);font-style:italic;font-size:13px}.player{display:flex;gap:10px;align-items:center;margin-top:14px}.scene-wrap{background:#0c0e14;border:1px solid var(--line);border-radius:8px;padding:8px}.progress{height:6px;background:var(--panel2);border-radius:999px;overflow:hidden}.progress>div{height:100%;background:linear-gradient(90deg,var(--brand),var(--brand2))}.board .illus{margin:14px 0}.illus-frame{width:100%;max-width:640px;aspect-ratio:16 / 10;overflow:hidden;border-radius:10px;border:1px solid var(--line);background:#0c0e14;margin:0 auto}.illus-frame img{width:100%;height:100%;object-fit:cover;display:block;transform-origin:center}.illus figcaption{text-align:center;color:var(--muted);font-size:13px;margin-top:6px}.illus-ph{max-width:640px;aspect-ratio:16 / 10;display:flex;align-items:center;justify-content:center;color:var(--muted);border:1px dashed var(--line);border-radius:10px;margin:0 auto}.kb-zoom-in img{animation:kbZoomIn 14s ease-out forwards}.kb-zoom-out img{animation:kbZoomOut 14s ease-out forwards}.kb-pan-left img{animation:kbPanLeft 14s ease-in-out forwards}.kb-pan-right img{animation:kbPanRight 14s ease-in-out forwards}@keyframes kbZoomIn{0%{transform:scale(1)}to{transform:scale(1.14)}}@keyframes kbZoomOut{0%{transform:scale(1.14)}to{transform:scale(1)}}@keyframes kbPanLeft{0%{transform:scale(1.14) translate(4%)}to{transform:scale(1.14) translate(-4%)}}@keyframes kbPanRight{0%{transform:scale(1.14) translate(-4%)}to{transform:scale(1.14) translate(4%)}}.voicebar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:12px}.voicebar select{width:auto}.stage{margin:14px 0}.stage-box{position:relative;width:100%;max-width:720px;aspect-ratio:16 / 9;margin:0 auto;overflow:hidden;border-radius:12px;border:1px solid var(--line);background:#0c0e14}.stage-world{position:absolute;top:0;right:0;bottom:0;left:0;will-change:transform}.stage-backdrop{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;object-fit:cover}.stage-bd-fallback{background:radial-gradient(120% 120% at 50% 20%,#1b2740,#0c0e14)}.stage-sprite{position:absolute;width:24%;height:auto;will-change:transform,opacity,left,top;transition:none;filter:drop-shadow(0 8px 12px rgba(0,0,0,.35))}.stage-sprite-ph{width:56px;height:56px;display:flex;align-items:center;justify-content:center;font-size:30px;background:#1f232d;border-radius:10px}.stage-caption{position:absolute;left:0;right:0;bottom:0;padding:10px 14px;background:linear-gradient(transparent,#000000a6);color:#fff;font-size:15px;text-align:center;min-height:20px}.stage-replay{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:#101218bf;border:1px solid var(--line);color:#fff;padding:10px 16px;border-radius:999px}