.welcome-page{min-height:100vh;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}.particles{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;overflow:hidden}.particle{position:absolute;width:4px;height:4px;background:var(--accent-cyan);border-radius:50%;opacity:.5;animation:particleFloat 10s infinite ease-in-out}.particle:nth-child(2n){background:var(--accent-magenta)}.particle:nth-child(3n){background:var(--accent-gold)}@keyframes particleFloat{0%,to{transform:translateY(100vh) scale(0);opacity:0}10%{opacity:.5}50%{transform:translateY(50vh) scale(1);opacity:.8}90%{opacity:.5}}.welcome-container{display:flex;flex-direction:column;align-items:center;gap:32px;padding:40px 20px;max-width:600px;text-align:center;z-index:1}.welcome-logo{opacity:0;transform:translateY(-30px);transition:all .8s ease-out}.welcome-logo.visible{opacity:1;transform:translateY(0)}.logo-icon{font-size:5rem;display:flex;justify-content:center;gap:20px;margin-bottom:16px;animation:float 3s ease-in-out infinite}.logo-x{color:var(--accent-cyan);text-shadow:var(--glow-cyan),0 0 60px rgba(0,245,255,.4);animation:glow 2s ease-in-out infinite}.logo-o{color:var(--accent-magenta);text-shadow:var(--glow-magenta),0 0 60px rgba(255,0,255,.4);animation:glow 2s ease-in-out infinite .5s}.logo-title{font-family:Orbitron,sans-serif;font-size:4rem;font-weight:900;display:flex;align-items:center;justify-content:center;gap:16px;letter-spacing:.1em}.title-x{color:var(--accent-cyan);text-shadow:var(--glow-cyan)}.title-vs{font-size:1.5rem;color:var(--text-secondary);font-weight:400}.title-o{color:var(--accent-magenta);text-shadow:var(--glow-magenta)}.logo-subtitle{font-family:Orbitron,sans-serif;font-size:1.2rem;letter-spacing:.5em;color:var(--accent-gold);text-shadow:var(--glow-gold);margin-top:8px}.welcome-text{opacity:0;transform:translateY(20px);transition:all .8s ease-out .3s}.welcome-text.visible{opacity:1;transform:translateY(0)}.typing-text{font-size:1.4rem;color:var(--text-secondary);font-weight:300}.cursor{animation:blink 1s infinite;color:var(--accent-cyan)}.welcome-tagline{opacity:0;transform:translateY(20px);transition:all .8s ease-out .5s}.welcome-tagline.visible{opacity:1;transform:translateY(0)}.welcome-tagline h2{font-family:Orbitron,sans-serif;font-size:2rem;color:var(--accent-gold);text-shadow:var(--glow-gold);margin:0;letter-spacing:.1em}.leaderboard-wrapper{opacity:0;transform:translateY(20px);transition:all .8s ease-out .7s;width:100%;max-width:500px}.leaderboard-wrapper.visible{opacity:1;transform:translateY(0)}.welcome-actions{opacity:0;transform:translateY(20px);transition:all .8s ease-out .7s}.welcome-actions.visible{opacity:1;transform:translateY(0)}.btn-large{padding:20px 60px;font-size:1.2rem;font-family:Orbitron,sans-serif}.welcome-footer{display:flex;align-items:center;gap:16px;margin-top:24px;opacity:0;transition:all .8s ease-out .9s}.welcome-footer.visible{opacity:1}.link-btn{background:none;border:none;color:var(--text-muted);font-size:.85rem;cursor:pointer;transition:color .3s ease}.divider{color:var(--text-muted)}@media (max-width: 600px){.welcome-page{min-height:100vh;min-height:100dvh;padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom)}.welcome-container{gap:24px;padding:24px 16px}.logo-icon{font-size:3rem;gap:16px}.logo-title{font-size:2.2rem;gap:10px}.title-vs{font-size:1.2rem}.logo-subtitle{font-size:.85rem;letter-spacing:.25em}.typing-text{font-size:1rem}.welcome-tagline h2{font-size:1.3rem}.leaderboard-wrapper{max-width:100%;width:100%}.btn-large{padding:16px 40px;font-size:1rem;width:100%;max-width:300px}.welcome-footer{flex-wrap:wrap;justify-content:center;gap:4px 8px;padding:8px}.welcome-footer .link-btn{font-size:.75rem;padding:6px 8px}.welcome-footer .divider{display:inline;margin:0 2px}}@media (max-width: 375px){.welcome-container{gap:20px;padding:20px 12px}.logo-icon{font-size:2.5rem}.logo-title{font-size:1.8rem}.logo-subtitle{font-size:.75rem;letter-spacing:.2em}.welcome-tagline h2{font-size:1.1rem}.typing-text{font-size:.9rem}.btn-large{padding:14px 32px;font-size:.9rem}}.leaderboard{width:100%;max-width:850px;background:#0006;border:1px solid rgba(255,255,255,.1);border-radius:20px;padding:24px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.leaderboard-header{text-align:center;margin-bottom:20px}.leaderboard-header h3{font-family:Orbitron,sans-serif;font-size:1.5rem;color:var(--accent-gold);text-shadow:var(--glow-gold);margin:0}.leaderboard-list{display:flex;flex-direction:column;gap:8px}.leaderboard-item{display:flex;align-items:center;gap:12px;padding:12px 16px;background:#ffffff08;border:1px solid rgba(255,255,255,.08);border-radius:12px;transition:all .3s ease;animation:slideInUp .5s ease-out 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infinite;display:inline-block}@keyframes growPulse{0%,to{transform:scale(1)}50%{transform:scale(1.2)}}@keyframes slideInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}@media (max-width: 600px){.leaderboard{padding:16px;max-width:100%}.leaderboard-header h3{font-size:1.2rem}.leaderboard-item{padding:10px 12px}.leaderboard-name{font-size:.85rem}.leaderboard-stats{font-size:.75rem;flex-wrap:wrap;gap:8px}}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;position:relative;overflow:hidden}.auth-page:before{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle at 30% 30%,rgba(0,245,255,.1) 0%,transparent 40%),radial-gradient(circle at 70% 70%,rgba(255,0,255,.1) 0%,transparent 40%);animation:rotateBg 20s linear infinite;pointer-events:none;z-index:0}@keyframes 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rgba(255,255,255,.08);display:flex;flex-direction:column;gap:20px}.checkbox-group{margin-top:4px}.checkbox-label{display:flex;align-items:flex-start;gap:12px;cursor:pointer;font-size:.85rem;color:var(--text-secondary)}.checkbox-label input{display:none}.checkmark{width:20px;height:20px;min-width:20px;border:2px solid rgba(255,255,255,.2);border-radius:4px;position:relative;transition:all .3s ease}.checkbox-label input:checked+.checkmark{background:var(--accent-cyan);border-color:var(--accent-cyan)}.checkbox-label input:checked+.checkmark:after{content:"✓";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);color:var(--bg-primary);font-size:12px;font-weight:700}.checkbox-text{line-height:1.4}.link-inline{background:none;border:none;color:var(--accent-cyan);cursor:pointer;font-size:inherit;padding:0;text-decoration:underline}.error-message{background:#ff44661a;border:1px solid rgba(255,68,102,.3);color:var(--accent-red);padding:12px 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ease}.cost-btn:hover{border-color:var(--accent-cyan);transform:scale(1.05)}.cost-btn.active{background:linear-gradient(135deg,#00f5ff33,#f0f3);border-color:var(--accent-cyan);box-shadow:var(--glow-cyan)}.custom-cost{margin-bottom:24px}.custom-cost label{display:block;color:var(--text-secondary);font-size:.9rem;margin-bottom:8px}.cost-input{width:150px;text-align:center;font-family:Orbitron,sans-serif;font-size:1.2rem}.attempt-info{display:flex;justify-content:center;gap:32px;margin-bottom:32px;padding:20px;background:#ffffff08;border-radius:16px}.attempt-info-item{display:flex;flex-direction:column;gap:4px}.attempt-info-item .label{font-size:.8rem;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.1em}.attempt-info-item .value{font-family:Orbitron,sans-serif;font-size:1.5rem;font-weight:700}.attempt-info-item 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infinite}.cell.x.winning{border-color:var(--accent-cyan);box-shadow:var(--glow-cyan)}.cell.o.winning{border-color:var(--accent-magenta);box-shadow:var(--glow-magenta)}.cell-content{font-size:4.5rem;font-weight:700;animation:scaleIn .25s ease-out}.cell.x .cell-content{color:var(--accent-cyan);text-shadow:var(--glow-cyan)}.cell.o .cell-content{color:var(--accent-magenta);text-shadow:var(--glow-magenta)}.strike-line{position:absolute;height:8px;border-radius:4px;animation:strikethrough .6s ease-out forwards;z-index:10;box-shadow:0 0 20px currentColor}.strike-line.x{background:var(--accent-cyan);box-shadow:var(--glow-cyan),0 0 30px #00f5ff99}.strike-line.o{background:var(--accent-magenta);box-shadow:var(--glow-magenta),0 0 30px #f0f9}.game-status{font-size:1.1rem;color:var(--text-secondary);padding:12px 24px;background:#ffffff08;border-radius:12px}.game-status .status.thinking{animation:pulse .8s ease-in-out infinite}.result-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0a0a1af2;display:flex;align-items:center;justify-content:center;z-index:100;animation:fadeIn .5s ease-out}.result-content{text-align:center;animation:scaleIn .5s ease-out}.result-emoji{font-size:5rem;display:block;margin-bottom:16px;animation:celebrate .8s ease-in-out}.result-title{font-family:Orbitron,sans-serif;font-size:3rem;margin-bottom:12px}.result-overlay.win .result-title{color:var(--accent-green);text-shadow:var(--glow-green);animation:celebrate .6s ease-in-out infinite}.result-overlay.loss .result-title{color:var(--accent-red);animation:shake .5s ease-in-out}.result-overlay.draw .result-title{color:var(--accent-gold);text-shadow:var(--glow-gold)}.result-subtext{font-size:1.3rem;color:var(--text-secondary);margin-bottom:32px}.result-actions{display:flex;gap:16px;justify-content:center}.game-footer{padding:16px 24px;background:var(--bg-secondary);border-top:1px solid 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6px}}.link-inline{background:none;border:none;color:var(--accent-cyan);cursor:pointer;font-family:inherit;font-size:inherit;padding:0;text-decoration:underline;text-underline-offset:2px}.link-inline:hover{color:var(--accent-magenta)}.loader{width:20px;height:20px;border:2px solid transparent;border-top-color:currentColor;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.error-message{background:#ff44661a;border:1px solid rgba(255,68,102,.3);color:var(--accent-red);padding:12px 16px;border-radius:10px;font-size:.9rem;text-align:center}.success-message{background:#00ff881a;border:1px solid rgba(0,255,136,.3);color:var(--accent-green);padding:12px 16px;border-radius:10px;font-size:.9rem;text-align:center}.divider{color:var(--text-muted);margin:0 8px;opacity:.5}@media (max-width: 480px){.divider{margin:0 4px}}.welcome-footer{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:4px;padding:16px}@media (max-width: 480px){.welcome-footer{gap:2px;padding:12px 8px}.welcome-footer .link-btn{font-size:.75rem}.welcome-footer .divider{margin:0 2px}}