:root{--bg:#0b1020;--panel:#111933cc;--ink:#e5e7eb;--muted:#9ca3af;--accent:#7dd3fc;--bad:#f87171;--good:#34d399}
*{box-sizing:border-box} html,body{height:100%}
body{margin:0;color:var(--ink);font:16px/1.4 system-ui,-apple-system,Segoe UI,Roboto; background: radial-gradient(1200px 800px at 20% 10%, #101735 0%, #0b1020 55%, #070a16 100%), radial-gradient(800px 600px at 80% 80%, #0c1228 0%, #0b1020 60%, #070a16 100%)}
.screen{display:none; padding:18px; max-width:1200px; margin:0 auto} .screen.visible{display:block}
.hero h1{margin:0 0 6px} .hero p{color:#c7d2fe}
.actions{display:flex;gap:8px;margin:10px 0 14px}
.btn{appearance:none;border:1px solid #ffffff22;background:var(--panel);color:var(--ink);padding:.6rem .9rem;border-radius:.7rem;cursor:pointer}
.btn.primary{background:linear-gradient(180deg,#0e2741cc,#0d1f36cc);box-shadow:0 0 0 1px #6ee7b7aa inset}
.btn.warn{background:linear-gradient(180deg,#3b0d0dcc,#2a0b0bcc);border-color:#fca5a5aa}
.rooms h2{margin:.2rem 0 .5rem} .rooms-list{display:grid;gap:8px}
.room-card{display:flex;align-items:center;gap:10px;background:var(--panel);border:1px solid #ffffff22;border-radius:.7rem;padding:.6rem .8rem}
.badge{padding:.2rem .5rem;border:1px solid #ffffff22;border-radius:.5rem;background:#0b345533}
.footnote{margin-top:8px;color:#9fb4ff}
.room-header{display:flex;align-items:center;gap:8px;justify-content:space-between}
.share{display:flex;gap:8px;margin:10px 0}
.chat{margin-top:10px} .chat-log{background:var(--panel);border:1px solid #ffffff22;border-radius:.7rem;min-height:120px;max-height:220px;overflow:auto;padding:8px}
.chat-log.small{min-height:80px;max-height:160px}
.chat-input{display:flex;gap:6px;margin-top:6px} .chat-input input{flex:1;padding:.55rem .6rem;border-radius:.6rem;border:1px solid #ffffff22;background:#0b1224;color:var(--ink)}
.waiting-card{margin-top:12px;background:var(--panel);border:1px solid #ffffff22;padding:12px;border-radius:.7rem}

.game-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.game-wrap{display:grid;grid-template-columns:2fr 1fr;gap:12px}
.panel{background:var(--panel);border:1px solid #ffffff22;border-radius:.8rem;padding:10px}
.log{max-height:240px;overflow:auto;background:#0a1224;border-radius:.5rem;border:1px solid #ffffff22;padding:6px}

.cube-scene{display:grid;place-items:center;perspective:1600px;height:70vh}
.cube{position:relative;width:min(78vmin,720px);height:min(78vmin,720px);transform-style:preserve-3d;transition:transform .5s}
.face{position:absolute;inset:0;display:grid;place-items:center;background:linear-gradient(180deg,#0f1933,#0c1428);border:1px solid #ffffff10;box-shadow:0 0 0 1px #0008 inset,0 20px 60px #000c inset;border-radius:16px;overflow:hidden}
.face .label{position:absolute;top:10px;left:12px;font-size:.8rem;color:#9fb4ff;background:#0005;padding:.2rem .5rem;border-radius:.4rem}
.grid{width:92%;height:92%;display:grid;grid-template-columns:repeat(10,1fr);grid-template-rows:repeat(10,1fr);gap:2px;padding:10px;border-radius:12px;background:linear-gradient(180deg,#0a1224,#0b1328);box-shadow:inset 0 0 0 1px #ffffff10, inset 0 0 40px #00d4ff10}
.cell{background:linear-gradient(180deg,#0f2244,#0e1b36);border-radius:6px;display:flex;align-items:center;justify-content:center;cursor:crosshair}
.cell.miss::after{content:"";width:44%;height:44%;border-radius:50%;background:radial-gradient(circle,#a5b4fc 0,#94a3b8 50%,transparent 60%);opacity:.7}
.cell.hit{background:linear-gradient(180deg,#163537,#0f2526);box-shadow:inset 0 0 0 1px #34d39966, inset 0 0 30px #34d39955}
.cell.hit::after{content:"✕";font-weight:900;font-size:1.1rem;color:#9ef3d0}

.front{transform:rotateY(0deg) translateZ(calc(min(78vmin,720px)/2))}
.right{transform:rotateY(90deg) translateZ(calc(min(78vmin,720px)/2))}
.top{transform:rotateX(90deg) translateZ(calc(min(78vmin,720px)/2))}
.back{transform:rotateY(180deg) translateZ(calc(min(78vmin,720px)/2))}
.left{transform:rotateY(-90deg) translateZ(calc(min(78vmin,720px)/2))}
.bottom{transform:rotateX(-90deg) translateZ(calc(min(78vmin,720px)/2))}

@media (max-width:1000px){.game-wrap{grid-template-columns:1fr}}