:root{--bg:#0f1226;--panel:#1a1f3d;--line:#2e3566;--x:#4 dd;--xc:#5ad1ff;--oc:#ff6b9d;--txt:#e8ecff;--muted:#9aa3d0;--accent:#7c8cff}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:radial-gradient(1200px 800px at 50% -10%,#1c2350,#0f1226);color:var(--txt);min-height:100vh}
.app{max-width:640px;margin:0 auto;padding:16px}
header h1{text-align:center;font-weight:800;letter-spacing:.5px;margin:10px 0 18px}
header h1 span{color:var(--accent)}
.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:20px;display:flex;flex-direction:column;gap:12px}
.lead{margin:0 0 4px;color:var(--muted)}
label{display:flex;flex-direction:column;gap:6px;font-size:14px;color:var(--muted)}
input{background:#0f1330;border:1px solid var(--line);border-radius:10px;padding:12px;color:var(--txt);font-size:16px}
input:focus{outline:2px solid var(--accent)}
button{background:var(--accent);color:#fff;border:0;border-radius:10px;padding:12px 14px;font-size:16px;font-weight:600;cursor:pointer}
button:hover{filter:brightness(1.1)}
button.ghost{background:transparent;border:1px solid var(--line);color:var(--txt)}
.msg{min-height:18px;color:var(--oc);margin:0;font-size:14px}
.hidden{display:none!important}
.statusbar{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-bottom:12px}
.chip{background:var(--panel);border:1px solid var(--line);border-radius:999px;padding:6px 14px;font-size:14px}
.banner{text-align:center;font-size:20px;font-weight:800;padding:14px;border-radius:12px;margin-bottom:12px;background:linear-gradient(90deg,#2a326b,#3a2b5e)}
.big-board{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;background:var(--line);padding:8px;border-radius:14px}
.mini{position:relative;background:#12173a;border-radius:10px;padding:5px;display:grid;grid-template-columns:repeat(3,1fr);gap:4px;aspect-ratio:1}
.mini.active{outline:3px solid var(--accent);box-shadow:0 0 20px rgba(124,140,255,.4)}
.mini.won{overflow:hidden}
.cell{background:#1b2149;border-radius:6px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:min(6vw,26px);cursor:pointer;user-select:none;transition:background .1s}
.cell:hover{background:#242c60}
.cell.x{color:var(--xc)}
.cell.o{color:var(--oc)}
.cell.last{background:#33407f}
.mini .overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:min(22vw,110px);font-weight:900;border-radius:10px;background:rgba(10,13,35,.72)}
.overlay.x{color:var(--xc)}
.overlay.o{color:var(--oc)}
.overlay.d{color:var(--muted);font-size:min(9vw,44px)}
.controls{display:flex;gap:10px;margin-top:14px}
.controls button{flex:1}
.rules{color:var(--muted);font-size:13px;line-height:1.5;margin-top:14px}