:root{--bg-primary: #0a0a0a;--bg-secondary: #1a1a1a;--bg-card: #2a2a2a;--border-primary: #3a3a3a;--border-accent: #4a4a4a;--text-primary: #ffffff;--text-secondary: #b0b0b0;--text-muted: #808080;--accent-blue: #3b82f6;--accent-purple: #8b5cf6;--accent-green: #10b981;--accent-orange: #f59e0b;--accent-red: #ef4444;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px rgba(0, 0, 0, .2);--shadow-xl: 0 20px 25px rgba(0, 0, 0, .3);--radius-sm: 6px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px}*{margin:0;padding:0;box-sizing:border-box}body{background:var(--bg-primary);color:var(--text-primary);font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;line-height:1.6;min-height:100vh;overflow-x:hidden}.game-container{max-width:1400px;margin:0 auto;padding:24px}.header{margin-bottom:32px}.header-content{display:flex;justify-content:space-between;align-items:center;padding:24px 32px;background:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg)}.game-title{font-size:3.5rem;font-weight:800;letter-spacing:-.02em;background:linear-gradient(135deg,var(--text-primary) 0%,var(--text-secondary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.user-info{text-align:right}.user-welcome{font-size:1.1rem;font-weight:500;margin-bottom:4px}.username{color:var(--accent-blue);font-weight:600}.timestamp{font-size:.875rem;color:var(--text-muted);font-weight:400}.game-controls{display:flex;justify-content:space-between;align-items:center;margin-bottom:32px;padding:20px 32px;background:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:var(--radius-lg);flex-wrap:wrap;gap:20px}.control-group{display:flex;flex-direction:column;gap:8px}.control-group label{font-size:.875rem;font-weight:500;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em}.control-group select{background:var(--bg-card);color:var(--text-primary);border:1px solid var(--border-primary);border-radius:var(--radius-md);padding:12px 16px;font-family:inherit;font-size:.95rem;font-weight:500;cursor:pointer;transition:all .2s ease}.control-group select:hover{border-color:var(--accent-blue)}.control-group select:focus{outline:none;border-color:var(--accent-blue);box-shadow:0 0 0 3px #3b82f61a}.action-buttons{display:flex;gap:12px}.btn{padding:12px 24px;border:none;border-radius:var(--radius-md);font-family:inherit;font-size:.95rem;font-weight:500;cursor:pointer;transition:all .2s ease;display:flex;align-items:center;gap:8px}.btn-primary{background:var(--accent-blue);color:#fff}.btn-secondary{background:var(--accent-orange);color:#fff}.btn-outline{background:transparent;color:var(--text-secondary);border:1px solid var(--border-primary)}.btn:hover:not(:disabled){transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.score-dashboard{display:grid;grid-template-columns:1fr auto 1fr;gap:32px;margin-bottom:32px;align-items:center}.score-card{background:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:var(--radius-lg);padding:24px;text-align:center}.score-header{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:16px}.player-avatar{font-size:2rem}.player-name{font-size:1.1rem;font-weight:600;color:var(--text-secondary)}.score-value{font-size:4rem;font-weight:800;line-height:1;margin-bottom:8px}.player-card .score-value{color:var(--accent-blue)}.ai-card .score-value{color:var(--accent-purple)}.score-meta{font-size:.9rem;color:var(--text-muted);font-weight:500}.game-status-panel{background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-lg);padding:24px;text-align:center;min-width:200px}.status-text{font-size:1.25rem;font-weight:600;margin-bottom:12px;color:var(--accent-green)}.game-timer{font-size:2rem;font-weight:700;font-family:SF Mono,Monaco,Cascadia Code,monospace;color:var(--text-primary);margin-bottom:16px}.quick-stats{display:flex;justify-content:center;gap:16px;font-size:.875rem}.stat{color:var(--text-muted)}.stat strong{color:var(--text-primary);font-weight:600}.canvas-container{position:relative;display:flex;justify-content:center;margin-bottom:32px}#pongCanvas{background:var(--bg-secondary);border:2px solid var(--border-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);cursor:none}.game-overlay-controls{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);display:flex;flex-direction:column;gap:16px;z-index:10;width:280px}.game-btn{background:var(--bg-card);border:2px solid var(--border-primary);border-radius:var(--radius-lg);padding:20px 24px;font-family:inherit;font-weight:600;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;justify-content:center;gap:12px;position:relative;overflow:hidden}.game-btn:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.1),transparent);transition:left .6s}.game-btn:hover:before{left:100%}.primary-btn{border-color:var(--accent-blue);color:var(--accent-blue)}.primary-btn:hover{background:var(--accent-blue);color:#fff;transform:translateY(-2px);box-shadow:var(--shadow-lg)}.secondary-btn{border-color:var(--accent-purple);color:var(--accent-purple)}.secondary-btn:hover{background:var(--accent-purple);color:#fff;transform:translateY(-2px);box-shadow:var(--shadow-lg)}.restart-btn{border-color:var(--accent-green);color:var(--accent-green)}.restart-btn:hover{background:var(--accent-green);color:#fff;transform:translateY(-2px);box-shadow:var(--shadow-lg)}.btn-icon{font-size:1.5rem}.btn-label{font-size:1rem;text-transform:uppercase;letter-spacing:.05em}.game-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:#000000e6;display:none;justify-content:center;align-items:center;border-radius:var(--radius-lg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);z-index:20}.overlay-content{background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-xl);padding:40px;text-align:center;max-width:400px;width:90%}.overlay-content h2{font-size:2.5rem;font-weight:700;margin-bottom:16px;color:var(--text-primary)}.overlay-content p{font-size:1.125rem;color:var(--text-secondary);margin-bottom:24px}.overlay-stats{background:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:var(--radius-md);padding:20px;margin-bottom:24px;text-align:left;font-size:.95rem;line-height:1.6}.overlay-actions{display:flex;justify-content:center}.countdown-display{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:8rem;font-weight:900;color:var(--accent-blue);text-shadow:0 0 30px rgba(59,130,246,.5);display:none;z-index:25;animation:countdownPulse 1s ease-in-out}@keyframes countdownPulse{0%{transform:translate(-50%,-50%) scale(.5);opacity:0}50%{transform:translate(-50%,-50%) scale(1.2);opacity:1}to{transform:translate(-50%,-50%) scale(1);opacity:0}}.powerups-panel{position:absolute;top:16px;left:16px;z-index:15}.powerups-list{display:flex;flex-direction:column;gap:8px}.active-powerup{background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-md);padding:8px 12px;font-size:.875rem;font-weight:500;display:flex;align-items:center;gap:8px;min-width:150px}.powerup-multi-ball{border-color:var(--accent-red);color:var(--accent-red)}.powerup-speed-boost{border-color:var(--accent-orange);color:var(--accent-orange)}.powerup-paddle-extend{border-color:#eab308;color:#eab308}.powerup-life-up{border-color:var(--accent-green);color:var(--accent-green)}.powerup-freeze-ai{border-color:var(--accent-blue);color:var(--accent-blue)}.powerup-score-bonus{border-color:var(--accent-purple);color:var(--accent-purple)}.info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(350px,1fr));gap:24px;margin-bottom:32px}.info-card{background:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:var(--radius-lg);padding:24px}.card-title{font-size:1.25rem;font-weight:600;margin-bottom:20px;color:var(--text-primary);display:flex;align-items:center;gap:8px}.card-content{color:var(--text-secondary)}.control-item{display:flex;justify-content:space-between;align-items:center;padding:8px 0;border-bottom:1px solid var(--border-primary)}.control-item:last-child{border-bottom:none}.control-key{background:var(--bg-card);padding:4px 8px;border-radius:var(--radius-sm);font-size:.875rem;font-weight:600;font-family:SF Mono,monospace}.control-desc{font-size:.9rem}.mode-info{margin-top:16px;padding-top:16px;border-top:1px solid var(--border-primary)}.mode-info p{margin-bottom:8px;font-size:.9rem;line-height:1.5}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:16px}.stat-item{display:flex;flex-direction:column;gap:4px}.stat-label{font-size:.875rem;color:var(--text-muted);font-weight:500}.stat-value{font-size:1.5rem;font-weight:700;color:var(--accent-blue)}.powerup-list{display:flex;flex-direction:column;gap:12px}.powerup-item{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;padding:8px;background:var(--bg-card);border-radius:var(--radius-sm)}.powerup-icon{font-size:1.25rem}.powerup-name{font-weight:500;color:var(--text-primary)}.powerup-desc{font-size:.875rem;color:var(--text-muted)}.achievement-container{position:fixed;top:24px;right:24px;z-index:1000;max-width:300px}.achievement{background:var(--bg-card);border:1px solid var(--accent-green);border-radius:var(--radius-lg);padding:16px 20px;margin-bottom:12px;box-shadow:var(--shadow-lg);animation:achievementSlide .5s ease-out forwards;transform:translate(320px)}@keyframes achievementSlide{to{transform:translate(0)}}.achievement.fade-out{animation:achievementFadeOut .5s ease-out forwards}@keyframes achievementFadeOut{to{transform:translate(320px);opacity:0}}.game-running .game-overlay-controls{display:none}@media (max-width: 768px){.game-container{padding:16px}.header-content{flex-direction:column;gap:16px;text-align:center}.game-title{font-size:2.5rem}.user-info{text-align:center}.game-controls{flex-direction:column;align-items:stretch}.action-buttons{justify-content:center}.score-dashboard{grid-template-columns:1fr;gap:16px}#pongCanvas{width:100%;max-width:400px;height:auto}.game-overlay-controls{width:90%;max-width:250px}.info-grid{grid-template-columns:1fr}.stats-grid{grid-template-columns:repeat(2,1fr)}.countdown-display{font-size:4rem}}@media (max-width: 480px){.game-title{font-size:2rem}.score-value{font-size:3rem}.game-timer{font-size:1.5rem}.countdown-display{font-size:3rem}}