:root{--blue:#2563eb;--green:#059669;--ink:#111827;--muted:#6b7280;--line:#e5e7eb;--bg:#f8fafc;--card:#fff}*{box-sizing:border-box}body{color:var(--ink);background:var(--bg);margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}header{color:#fff;z-index:20;background:#0f172a;align-items:center;gap:12px;padding:12px 16px;display:flex;position:sticky;top:0}header h1{margin:0;font-size:20px}header p{color:#cbd5e1;margin:0;font-size:13px}#hamburger{color:#fff;background:0 0;border:1px solid #334155;border-radius:8px;margin:0;padding:6px 12px;font-size:22px}main{padding:0}.app{min-height:calc(100vh - 60px);display:flex}.sidebar{border-right:1px solid var(--line);background:#fff;flex-shrink:0;width:300px;padding:14px;transition:margin-left .2s;overflow:auto}body.sidebar-closed .sidebar{margin-left:-300px}.backdrop{display:none}@media (width<=900px){.sidebar{z-index:30;position:fixed;top:60px;bottom:0;left:0;box-shadow:0 0 20px #0003}body.sidebar-closed .sidebar{margin-left:-320px}.backdrop{z-index:25;background:#0006;display:block;position:fixed;inset:60px 0 0}body.sidebar-closed .backdrop{display:none}}.chat-main{flex:1;justify-content:center;padding:16px;display:flex}.chat-wrap{width:100%;max-width:820px}.card{background:var(--card);border:1px solid var(--line);border-radius:12px;margin:0 0 14px;padding:14px}h2{margin:0 0 10px;font-size:17px}h3{margin:12px 0 6px;font-size:14px}label{margin-top:10px;font-size:13px;font-weight:600;display:block}input,textarea,select{width:100%;font:inherit;border:1px solid #d1d5db;border-radius:8px;margin-top:4px;padding:9px}textarea{resize:vertical}button{background:var(--blue);color:#fff;cursor:pointer;font:inherit;border:0;border-radius:8px;margin:6px 6px 0 0;padding:9px 14px}button.secondary{background:#475569}button.danger{background:#dc2626}button:disabled{opacity:.5;cursor:default}.small{color:var(--muted);font-size:13px}.mono{word-break:break-all;font-family:ui-monospace,monospace}.room{text-align:left;border:1px solid var(--line);width:100%;color:var(--ink);cursor:pointer;background:#fff;border-radius:10px;margin:0 0 10px;padding:12px}.room.active{border-color:var(--blue);background:#eff6ff}.room b{display:block}.room span{color:var(--muted);font-size:13px}.badge{background:#dbeafe;border-radius:999px;padding:2px 8px;font-size:12px;font-weight:600;display:inline-block}.badge.running{background:#dcfce7}.badge.closed,.badge.scored{background:#fee2e2}.participants{flex-wrap:wrap;gap:8px;margin:10px 0;display:flex}.chip{border:1px solid var(--line);background:#fff;border-radius:999px;align-items:center;gap:8px;padding:4px 10px 4px 4px;font-size:13px;display:flex}.chip.turn{border-color:var(--blue);background:#eff6ff;font-weight:600}.avatar{color:#fff;background:var(--blue);border-radius:50%;place-items:center;width:28px;height:28px;font-weight:700;display:grid}.avatar.c1{background:var(--green)}.avatar.c2{background:#7c3aed}.avatar.c3{background:#ea580c}.chat{border:1px solid var(--line);background:#fff;border-radius:12px;flex-direction:column;min-height:480px;display:flex;overflow:hidden}.chat-header{border-bottom:1px solid var(--line);background:#f8fafc;padding:14px}.chat-header h2{margin:0 0 4px}.messages{flex-direction:column;flex:1;gap:12px;max-height:520px;padding:14px;display:flex;overflow:auto}.bubble{border-radius:14px;max-width:82%;padding:10px 12px;line-height:1.5}.bubble.left{background:#eff6ff;border-bottom-left-radius:4px;align-self:flex-start}.bubble.right{background:#dcfce7;border-bottom-right-radius:4px;align-self:flex-end}.bubble b{font-size:13px}.bubble .meta{color:var(--muted);font-size:12px}.composer{border-top:1px solid var(--line);background:#f8fafc;padding:12px}.composer textarea{margin-top:0}#toast{color:#fff;z-index:10;background:#111827;border-radius:10px;padding:12px 14px;display:none;position:fixed;bottom:16px;left:16px;right:16px}#toast.show{display:block}details{border:1px solid var(--line);background:#fff;border-radius:10px;margin:0 0 12px;padding:10px 12px}details summary{cursor:pointer;font-weight:600}.token-box{background:#fff7ed;border:1px solid #fdba74;border-radius:8px;margin-top:10px;padding:12px}.bubble.mod{text-align:center;background:#fff7ed;border:1px solid #fdba74;align-self:center}