:root{--primary-color: #6200EA;--secondary-color: #B388FF;--background-gradient: linear-gradient(135deg, #1A1A1A 0%, #2D1F3D 100%);--text-color: #FFFFFF;--text-secondary: #B0B0B0;--border-color: #444;--success-color: #4CAF50;--warning-color: #FF9800;--error-color: #F44336;--shadow: 0 8px 32px rgba(0, 0, 0, .3);--border-radius: 12px;--transition: all .3s cubic-bezier(.4, 0, .2, 1)}:root{--tetris-i: #00f0f0;--tetris-j: #0000f0;--tetris-l: #f0a000;--tetris-o: #f0f000;--tetris-s: #00f000;--tetris-t: #a000f0;--tetris-z: #f00000}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Didact 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#6200ea66}.welcome-features{display:flex;justify-content:center;gap:2rem;flex-wrap:wrap}.feature-item{display:flex;align-items:center;gap:.5rem;color:var(--text-secondary);font-size:.9rem}.feature-icon{color:var(--primary-color)}.modal{position:fixed;top:0;left:0;width:100vw;height:100vh;background:#000000e6;display:flex;align-items:center;justify-content:center;z-index:1000;opacity:0;visibility:hidden;transition:var(--transition)}.modal.active{opacity:1;visibility:visible}.modal-content{background:linear-gradient(135deg,#2d1f3d,#1a1a1a);padding:2rem;border-radius:var(--border-radius);box-shadow:var(--shadow);border:1px solid var(--border-color);max-width:400px;width:90%;text-align:center;transform:translateY(20px);transition:var(--transition);display:flex;flex-direction:column}.modal.active 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button{flex:1;padding:.75rem;margin:0}@keyframes pieceMove{0%{transform:translateY(-2px)}to{transform:translateY(0)}}@keyframes lineClear{0%{opacity:1;transform:scaleY(1)}50%{opacity:.5;transform:scaleY(.8)}to{opacity:0;transform:scaleY(0)}}.piece-move{animation:pieceMove .1s ease-out}.line-clear{animation:lineClear .2s ease-in-out}@media (hover: none) and (pointer: coarse){.control-btn:active{background:#6200ea80;transform:scale(.9)}}@media (max-width: 768px){.welcome-title{font-size:2.5rem}.welcome-btn{width:180px}.welcome-features{gap:1rem}.feature-item{font-size:.8rem}.onboarding-content{width:90%;padding:1.5rem}.form-actions{flex-direction:column}.form-actions .back-btn,.form-actions .submit-btn{flex:1}.welcome-footer{position:relative;margin-top:auto}}@media (min-width: 1200px){.game-main{max-width:1200px;margin:0 auto}.left-panel,.right-panel{min-width:240px}#game-canvas{width:360px;height:720px}#next-canvas{width:140px;height:140px}}@media (min-width: 992px) and (max-width: 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