:root{--snake-container-bg: transparent;--snake-border-color: #e5e7eb;--snake-glow-color: rgba(34, 197, 94, .3);--snake-btn-primary: rgba(59, 130, 246, .9);--snake-btn-primary-hover: rgba(37, 99, 235, .9);--snake-info-bg: rgba(255, 255, 255, .8);--snake-info-color: #374151;--snake-info-border: #e5e7eb;--snake-text-color: #374151;--snake-description-bg: rgba(255, 255, 255, .95);--snake-description-border: #e5e7eb;--snake-food-color: #ef4444;--snake-body-color: #22c55e}[data-theme=retro]{--snake-border-color: #22c55e;--snake-glow-color: rgba(34, 197, 94, .3);--snake-btn-primary: rgba(34, 197, 94, .9);--snake-btn-primary-hover: rgba(22, 163, 74, .9);--snake-info-bg: rgba(40, 44, 52, .8);--snake-info-color: #22c55e;--snake-info-border: #22c55e;--snake-text-color: #22c55e;--snake-description-bg: rgba(40, 44, 52, .95);--snake-description-border: #22c55e;--snake-food-color: #22c55e;--snake-body-color: #ffffff}.snake-container{position:relative;width:100%;min-height:80vh;isolation:isolate;contain:layout style paint;will-change:auto}#snakeCanvas{width:100%;height:80vh;background:var(--snake-container-bg);cursor:default;display:block;border:2px solid var(--snake-border-color);transform:translateZ(0);backface-visibility:hidden;will-change:transform}#snakeCanvas.game-playing{cursor:none}[data-theme=retro] #snakeCanvas{box-shadow:0 0 20px var(--snake-glow-color)}.snake-controls{position:absolute;top:10px;right:10px;display:flex;gap:.5rem;z-index:10;will-change:opacity}.snake-btn{padding:.375rem 1rem;font-size:.875rem;font-weight:700;border:none;cursor:pointer;color:#fff;background:var(--snake-btn-primary);min-height:44px;min-width:44px;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--snake-info-border);border-radius:8px;transition:transform .2s ease,box-shadow .2s ease;transition:all .2s ease}.snake-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #00000026}.snake-btn:focus-visible{outline:2px solid var(--snake-btn-primary);outline-offset:2px}.snake-btn:hover:not(:disabled){background:var(--snake-btn-primary-hover)}.snake-btn:active{transform:translateY(0)}.snake-btn:disabled{opacity:.6;cursor:not-allowed;transform:none}[data-theme=retro] .snake-btn{color:#000;font-family:Courier New,monospace;text-transform:uppercase;letter-spacing:.5px}[data-theme=retro] .snake-btn:hover:not(:disabled){box-shadow:0 0 10px var(--snake-glow-color)}.snake-info{position:absolute;left:50%;transform:translate(-50%);top:10px;display:flex;gap:2rem;padding:.75rem 1.5rem;background:var(--snake-info-bg);color:var(--snake-info-color);z-index:10;pointer-events:none;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--snake-info-border);border-radius:8px}.snake-info>div{font-size:1.2rem;font-weight:700;white-space:nowrap}[data-theme=retro] .snake-info{font-family:Courier New,monospace;text-shadow:0 0 5px rgba(34,197,94,.5)}.snake-description{margin-top:1rem;padding:1.5rem;background:var(--snake-description-bg);color:var(--snake-text-color);border:1px solid var(--snake-description-border);line-height:1.6;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--snake-info-border);border-radius:8px}[data-theme=retro] .snake-description{font-family:Courier New,monospace}.snake-pause-screen{position:absolute;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.1);display:flex;align-items:center;justify-content:center;z-index:100;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.pause-content{background:var(--snake-info-bg);color:var(--snake-info-color);border:2px solid var(--snake-info-border);border-radius:12px;padding:2rem;max-width:600px;max-height:80vh;overflow-y:auto;box-shadow:0 20px 60px #0000004d}[data-theme=retro] .pause-content{font-family:Courier New,monospace;text-shadow:0 0 3px rgba(34,197,94,.3);box-shadow:0 0 30px #22c55e33}.pause-title{text-align:center;margin:0 0 1.5rem;font-size:2rem;font-weight:700}[data-theme=retro] .pause-title{color:#22c55e;text-shadow:0 0 10px rgba(34,197,94,.5);text-transform:uppercase;letter-spacing:2px}.pause-sections{display:grid;gap:2rem}@media (min-width: 640px){.pause-sections{grid-template-columns:1fr 1fr}}.pause-section h3{margin:0 0 1rem;font-size:1.25rem;font-weight:700;border-bottom:2px solid var(--snake-info-border);padding-bottom:.5rem}[data-theme=retro] .pause-section h3{color:#22c55e;text-transform:uppercase;letter-spacing:1px}.controls-list{display:flex;flex-direction:column;gap:.75rem}.control-item{display:flex;align-items:center;gap:1rem}.control-item .key{background:var(--snake-btn-primary);color:#fff;padding:.25rem .75rem;border-radius:4px;font-family:monospace;font-weight:700;min-width:60px;text-align:center;font-size:.875rem}[data-theme=retro] .control-item .key{background:#22c55e;color:#000;text-shadow:none;box-shadow:0 0 5px #22c55e4d}.control-item .description{font-size:.9rem;opacity:.9}.rules-list{display:flex;flex-direction:column;gap:1rem}.rule-item{display:flex;align-items:center;gap:1rem}.rule-item .rule-icon{width:32px;height:32px;display:flex;align-items:center;justify-content:center;font-size:1.2rem}.rule-item .rule-info{display:flex;flex-direction:column;gap:.25rem}.rule-item .rule-info .rule-name{font-weight:700;font-size:.9rem}.rule-item .rule-info .rule-desc{font-size:.8rem;opacity:.8;line-height:1.3}.pause-resume{margin-top:2rem;text-align:center;padding-top:1.5rem;border-top:1px solid var(--snake-info-border)}.pause-resume p{margin:0;font-size:.9rem;opacity:.9}.pause-resume p strong{color:var(--snake-btn-primary)}[data-theme=retro] .pause-resume p strong{color:#22c55e}#startPrompt{display:none}@media (max-width: 768px){.snake-container{min-height:calc(100vh - 120px)}#snakeCanvas{height:calc(100vh - 140px);border-width:1px}.snake-controls{top:5px;right:5px;gap:.25rem}.snake-controls .snake-btn{padding:.5rem .75rem;font-size:.75rem;min-height:40px;min-width:40px}.snake-info{top:5px;gap:1rem;padding:.5rem 1rem;font-size:.9rem}.snake-info>div{font-size:1rem}.snake-description{padding:1rem;font-size:.9rem}.pause-sections{grid-template-columns:1fr}.pause-sections .pause-section:first-child{display:none}}@media (max-width: 480px){.snake-info{gap:.75rem;padding:.375rem .75rem}.snake-info>div{font-size:.875rem}.snake-controls .snake-btn{padding:.375rem .5rem;font-size:.7rem;min-height:36px;min-width:36px}}@media (max-width: 640px){.pause-content{margin:1rem;padding:1.5rem;max-height:90vh}.pause-title{font-size:1.5rem}.pause-sections{gap:1.5rem}.control-item{gap:.75rem}.control-item .key{min-width:50px;font-size:.75rem}.control-item .description{font-size:.85rem}.rule-item{gap:.75rem}.rule-item .rule-icon{width:28px;height:28px;font-size:1rem}}@media (prefers-contrast: high){:root{--snake-border-color: #000;--snake-info-bg: rgba(255, 255, 255, .95);--snake-info-color: #000;--snake-btn-primary: #000;--snake-btn-primary-hover: #333}#snakeCanvas{border-width:3px}}@media (prefers-reduced-motion: reduce){.snake-btn{transition:none}.snake-info{animation:none}#snakeCanvas{will-change:auto}}@media print{.snake-controls,.snake-info,.snake-pause-screen{display:none}#snakeCanvas{border:2px solid #000;background:#fff}}