:root{--bg-0:#0a0a12;--bg-1:#12121c;--surface:#17172380;--surface-solid:#17172a;--border:#2a2a3d;--border-light:#35354d;--accent:#8b5cf6;--accent-2:#38bdf8;--accent-soft:#8b5cf61f;--text:#f2f2f7;--text-dim:#9797ad;--text-faint:#6b6b85;--success:#4ade80;--danger:#f87171;--warning:#facc15;--radius:16px;--radius-sm:10px}*{box-sizing:border-box}body,html{padding:0;margin:0}body{min-height:100vh;background:radial-gradient(circle at 15% 0,#8b5cf633,transparent 45%),radial-gradient(circle at 90% 20%,#38bdf826,transparent 40%),var(--bg-0);background-attachment:fixed;color:var(--text);font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased}a{color:var(--accent-2);text-decoration:none}a:hover{text-decoration:underline}.auth-shell{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}.auth-card{width:100%;max-width:380px;background:var(--surface);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--border);border-radius:var(--radius);padding:32px 28px;box-shadow:0 20px 60px rgba(0,0,0,.45)}.page-shell{min-height:100vh;padding:28px 16px 60px}.page-inner{max-width:480px;margin:0 auto}.brand{display:flex;align-items:center;gap:10px;margin-bottom:6px}.brand-icon{font-size:26px;line-height:1}.brand-title{font-size:20px;font-weight:700;letter-spacing:-.02em}.auth-subtitle{color:var(--text-dim);font-size:14px;margin:0 0 24px}h1{font-size:22px;letter-spacing:-.02em;margin:0}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}.field label{font-size:12px;font-weight:600;color:var(--text-dim);text-transform:uppercase;letter-spacing:.04em}.input{width:100%;padding:13px 14px;border-radius:var(--radius-sm);border:1px solid var(--border-light);background:#0e0e18;color:var(--text);font-size:15px;outline:none;transition:border-color .15s ease,box-shadow .15s ease}.input::placeholder{color:var(--text-faint)}.input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.btn{width:100%;padding:13px 16px;border-radius:var(--radius-sm);border:none;font-size:15px;font-weight:600;cursor:pointer;transition:transform .1s ease,opacity .15s ease,filter .15s ease}.btn:active{transform:scale(.98)}.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}.btn-primary{background:linear-gradient(135deg,var(--accent),#6d28d9);color:#fff;box-shadow:0 8px 24px -8px rgba(139,92,246,.6)}.btn-primary:hover:not(:disabled){filter:brightness(1.08)}.btn-ghost{background:transparent;border:1px solid var(--border-light);color:var(--text-dim)}.btn-ghost:hover:not(:disabled){color:var(--text);border-color:var(--accent)}.btn-danger{background:linear-gradient(135deg,#ef4444,#991b1b);color:#fff}.btn-link{background:none;border:none;color:var(--accent-2);cursor:pointer;font-size:14px;padding:4px 0;width:auto}.alert{font-size:13px;padding:10px 12px;border-radius:var(--radius-sm);margin-bottom:14px;line-height:1.4}.alert-error{background:#f8717120;color:#fca5a5;border:1px solid #f8717140}.alert-info{background:#38bdf820;color:#7dd3fc;border:1px solid #38bdf840}.alert-success{background:#4ade8020;color:#86efac;border:1px solid #4ade8040}.alert-warning{background:#facc1520;color:#fde047;border:1px solid #facc1540}.helper-text{color:var(--text-dim);font-size:13.5px;line-height:1.5;margin:0 0 14px}.footer-note{text-align:center;margin-top:18px;font-size:14px;color:var(--text-dim)}.card{background:var(--surface);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border:1px solid var(--border);border-radius:var(--radius);padding:20px}.card+.card{margin-top:14px}.topbar{display:flex;justify-content:space-between;margin-bottom:20px}.badge,.topbar{align-items:center}.badge{display:inline-flex;gap:6px;padding:5px 10px;border-radius:999px;font-size:12px;font-weight:600;background:var(--accent-soft);color:#c4b5fd;border:1px solid #8b5cf640}.badge-dot{width:7px;height:7px;border-radius:999px;background:currentColor}.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:10px;gap:10px;margin:18px 0}.stat-box{padding:16px 8px;text-align:center;border-radius:var(--radius-sm);background:#0e0e18;border:1px solid var(--border)}.stat-value{font-size:24px;font-weight:800;line-height:1.1}.stat-label{font-size:11.5px;color:var(--text-dim);text-transform:uppercase;letter-spacing:.04em;margin-top:4px}.history-row{display:flex;justify-content:space-between;align-items:center;padding:13px 14px;border-radius:var(--radius-sm);background:#0e0e18;border:1px solid var(--border);font-size:13.5px}.history-row+.history-row{margin-top:8px}.result-pill{font-weight:700;font-size:12.5px;padding:3px 9px;border-radius:999px}.result-win{background:#4ade8022;color:var(--success)}.result-lose{background:#f8717122;color:var(--danger)}.result-draw{background:#facc1522;color:var(--warning)}.player-row{display:flex;justify-content:space-between;gap:10px;margin-bottom:16px}.player-chip{flex:1 1;padding:12px;border-radius:var(--radius-sm);background:#0e0e18;border:1px solid var(--border);display:flex;flex-direction:column;gap:4px}.player-chip.is-turn{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.player-chip-label{font-size:11px;text-transform:uppercase;letter-spacing:.04em;color:var(--text-dim);display:flex;align-items:center;gap:6px}.player-chip-value{font-size:14px;font-weight:600}.piece-swatch{width:12px;height:12px;border-radius:3px;border:1.5px solid #00000055;display:inline-block}.piece-swatch.white{background:#eeeed2}.piece-swatch.black{background:#302e2c}.board-wrap{border-radius:14px;overflow:hidden;box-shadow:0 20px 50px -12px rgba(0,0,0,.6);border:1px solid var(--border)}.center-msg{min-height:100vh;display:flex;align-items:center;justify-content:center;color:var(--text-dim);padding:24px;text-align:center;font-size:15px}.spinner{width:22px;height:22px;border-radius:999px;border:3px solid var(--border-light);border-top-color:var(--accent);animation:spin .7s linear infinite;margin:0 auto 12px}@keyframes spin{to{transform:rotate(1turn)}}.step-dots{display:flex;gap:6px;margin-bottom:18px}.step-dot{height:4px;flex:1 1;border-radius:999px;background:var(--border-light);transition:background .2s ease}.step-dot.active{background:var(--accent)}