:root{--bg: #0f1115;--panel: #171a21;--panel2: #1d212b;--border: #2a2f3a;--text: #e8eaf0;--dim: #8a92a6;--accent: #5b8cff;--green: #4ade80;--red: #f87171;--amber: #fbbf24}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,PingFang SC,Segoe UI,system-ui,sans-serif;background:var(--bg);color:var(--text);font-size:14px}a{color:var(--accent);text-decoration:none}h1,h2,h3{margin:0 0 12px}.layout{display:flex;min-height:100vh}.side{width:210px;background:var(--panel);border-right:1px solid var(--border);padding:18px 14px;display:flex;flex-direction:column;gap:4px;position:sticky;top:0;height:100vh}.brand{font-weight:700;font-size:16px;margin-bottom:14px;letter-spacing:.3px}.brand small{display:block;color:var(--dim);font-weight:400;font-size:11px}.nav-item{padding:9px 12px;border-radius:8px;color:var(--dim);cursor:pointer}.nav-item:hover,.nav-item.active{background:var(--panel2);color:var(--text)}.side .spacer{flex:1}.credits{padding:10px 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img{width:18px;height:18px;border-radius:4px;margin-right:7px}.demo-nav{padding:7px 10px;border-radius:7px;color:var(--dim);font-size:12px}.demo-nav.on{background:var(--panel2);color:var(--text)}.demo-main{flex:1;padding:16px}.demo-phases{display:flex;gap:5px;flex-wrap:wrap;margin-bottom:14px}.dp{padding:5px 10px;border:1px solid var(--border);border-radius:999px;font-size:11px;color:var(--dim)}.dp.done{color:var(--green);border-color:#1f4d33}.dp.cur{color:var(--text);border-color:var(--accent);background:#1a2340;animation:pulse 1.6s ease-in-out infinite}@keyframes pulse{0%,to{box-shadow:0 0 #5b8cff00}50%{box-shadow:0 0 0 4px #5b8cff26}}.demo-log{background:#080a0e;border:1px solid var(--border);border-radius:9px;padding:12px 14px;font-family:ui-monospace,Menlo,monospace;font-size:12px;line-height:2}.dl{opacity:0;animation:dlin .5s forwards}@keyframes dlin{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}.dl 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