:root{--bg-color:#050505;--text-color:#fff;--primary-neon:#00f2ff;--secondary-neon:#7000ff;--glass-bg:#ffffff0d;--glass-border:#ffffff1a;--font-main:"Inter", system-ui, -apple-system, sans-serif}[data-theme=minimal]{--primary-neon:#fff;--secondary-neon:#888}[data-theme=space]{--primary-neon:#ff00ea;--secondary-neon:#0037ff}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-color);font-family:var(--font-main);height:100vh;overflow:hidden}#app{width:100%;height:100%;position:relative}#game-canvas{z-index:1;width:100%;height:100%;position:absolute;top:0;left:0}#ui-container{z-index:2;pointer-events:none;justify-content:center;align-items:center;width:100%;height:100%;display:flex;position:absolute;top:0;left:0}#ui-container>section{pointer-events:auto}.hidden{display:none!important}.glass-panel{background:var(--glass-bg);-webkit-backdrop-filter:blur(10px);border:1px solid var(--glass-border);text-align:center;border-radius:20px;padding:40px;transition:opacity .5s,transform .5s;box-shadow:0 8px 32px #0000005e}.title{letter-spacing:4px;text-shadow:0 0 10px var(--primary-neon);margin-bottom:40px;font-size:3rem;font-weight:900}.badge-3d{color:var(--primary-neon);vertical-align:super;font-size:1.2rem}.menu-actions{flex-direction:column;gap:15px;display:flex}button{cursor:pointer;text-transform:uppercase;letter-spacing:1px;font-family:inherit;font-weight:600;transition:all .3s}.btn-primary{background:linear-gradient(45deg, var(--primary-neon), var(--secondary-neon));color:#fff;border:none;border-radius:12px;padding:15px 30px;font-size:1rem}.btn-primary:hover{box-shadow:0 0 20px var(--primary-neon);transform:translateY(-2px)}.btn-secondary{border:1px solid var(--glass-border);color:#fff;background:0 0;border-radius:10px;padding:12px 25px}.btn-secondary:hover{background:var(--glass-border)}.btn-secondary.active{border-color:var(--primary-neon);color:var(--primary-neon)}.difficulty-selector{flex-direction:column;gap:10px;margin:10px 0;display:flex}.difficulty-selector label{opacity:.7;font-size:.8rem}.diff-options{grid-template-columns:1fr 1fr 1fr;gap:5px;display:grid}#game-hud{flex-direction:column;justify-content:space-between;width:100%;height:100%;padding:30px;display:flex;position:absolute;top:0;left:0}.hud-top{justify-content:center;align-items:center;gap:60px;width:100%;display:flex}.player-info{opacity:.4;flex-direction:column;align-items:center;min-width:150px;transition:opacity .5s;display:flex}.turn-indicator{letter-spacing:4px;opacity:.6;font-size:1.2rem;font-weight:900}.player-info.active{opacity:1}.player-info .label{font-size:.9rem;font-weight:800}.player-info.player-x .label{color:var(--primary-neon)}.player-info.player-o .label{color:var(--secondary-neon)}.player-info .score{font-size:2.5rem;font-weight:900}.hud-bottom{justify-content:center;gap:20px;display:flex}.btn-icon{background:var(--glass-bg);border:1px solid var(--glass-border);color:#fff;border-radius:25px;justify-content:center;align-items:center;width:50px;height:50px;font-size:1.2rem;display:flex}.btn-icon:hover{background:var(--glass-border)}#end-screen h2{margin-bottom:30px;font-size:3rem}.end-actions{gap:15px;display:flex}@media (width<=600px){.glass-panel{width:90%;padding:25px}.title{font-size:2rem}.hud-top{gap:20px}.player-info .score{font-size:1.8rem}}