:root{--bg-primary: #0a0a0f;--bg-secondary: #12121a;--bg-card: #1a1a25;--bg-card-hover: #222230;--accent-primary: #00ff88;--accent-secondary: #00cc6a;--accent-glow: rgba(0, 255, 136, .3);--text-primary: #f0f0f5;--text-secondary: #8888a0;--text-muted: #555565;--border-color: #2a2a3a;--error-color: #ff4466;--error-glow: rgba(255, 68, 102, .3);--font-display: "Chakra Petch", sans-serif;--font-mono: "JetBrains Mono", monospace;--radius-sm: 6px;--radius-md: 12px;--radius-lg: 20px;--transition-fast: .15s ease;--transition-normal: .25s ease}*{margin:0;padding:0;box-sizing:border-box}html,body{height:100%}body{font-family:var(--font-display);background:var(--bg-primary);color:var(--text-primary);line-height:1.6;background-image:radial-gradient(ellipse at top,rgba(0,255,136,.05) 0%,transparent 50%),radial-gradient(ellipse at bottom right,rgba(100,100,255,.03) 0%,transparent 50%);min-height:100vh}.container{max-width:800px;margin:0 auto;padding:2rem;min-height:100vh;display:flex;flex-direction:column}header{text-align:center;margin-bottom:3rem}h1{font-size:clamp(2rem,6vw,3.5rem);font-weight:700;letter-spacing:.05em;text-transform:uppercase;background:linear-gradient(135deg,var(--accent-primary),#40ffaa,var(--accent-primary));background-size:200% 200%;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:gradient-shift 8s ease infinite;text-shadow:0 0 60px var(--accent-glow)}@keyframes gradient-shift{0%,to{background-position:0% 50%}50%{background-position:100% 50%}}.tagline{color:var(--text-secondary);font-size:1.1rem;margin-top:.5rem;font-weight:400}main{flex:1;display:flex;align-items:center;justify-content:center}.screen{display:none;width:100%;animation:fade-in .3s ease}.screen.active{display:block}@keyframes fade-in{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.game-modes{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem}.mode-btn{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:2.5rem 2rem;cursor:pointer;transition:all var(--transition-normal);display:flex;flex-direction:column;align-items:center;gap:1rem;position:relative;overflow:hidden}.mode-btn:before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,var(--accent-glow),transparent);opacity:0;transition:opacity var(--transition-normal)}.mode-btn:hover{background:var(--bg-card-hover);border-color:var(--accent-primary);transform:translateY(-4px);box-shadow:0 20px 40px -20px var(--accent-glow)}.mode-btn:hover:before{opacity:1}.mode-icon{font-size:3rem;position:relative}.mode-title{font-size:1.5rem;font-weight:600;color:var(--text-primary);position:relative}.mode-desc{font-size:.95rem;color:var(--text-secondary);position:relative}h2{font-size:1.8rem;font-weight:600;margin-bottom:2rem;text-align:center}.setting-group{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:1.5rem;margin-bottom:2rem}.setting-group label{display:block;font-weight:500;margin-bottom:1rem;color:var(--text-secondary)}.difficulty-slider{padding:0 .5rem}.difficulty-slider input[type=range]{width:100%;height:8px;border-radius:4px;background:var(--bg-secondary);appearance:none;cursor:pointer}.difficulty-slider input[type=range]::-webkit-slider-thumb{appearance:none;width:24px;height:24px;border-radius:50%;background:var(--accent-primary);cursor:pointer;box-shadow:0 0 20px var(--accent-glow);transition:transform var(--transition-fast)}.difficulty-slider input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.2)}.difficulty-labels{display:flex;justify-content:space-between;margin-top:.75rem;font-size:.85rem;color:var(--text-muted)}.button-group{display:flex;gap:1rem;justify-content:center}.btn{font-family:var(--font-display);font-size:1rem;font-weight:600;padding:1rem 2rem;border-radius:var(--radius-md);border:none;cursor:pointer;transition:all var(--transition-fast);text-transform:uppercase;letter-spacing:.05em}.btn.primary{background:var(--accent-primary);color:var(--bg-primary)}.btn.primary:hover:not(:disabled){background:var(--accent-secondary);box-shadow:0 0 30px var(--accent-glow)}.btn.primary:disabled{background:var(--bg-card);color:var(--text-muted);cursor:not-allowed;opacity:.7}.btn.secondary{background:var(--bg-card);color:var(--text-primary);border:1px solid var(--border-color)}.btn.secondary:hover{background:var(--bg-card-hover);border-color:var(--text-muted)}.btn.icon{padding:.75rem;font-size:1.2rem;min-width:48px}.loader{text-align:center}.spinner{width:60px;height:60px;border:3px solid var(--border-color);border-top-color:var(--accent-primary);border-radius:50%;margin:0 auto 1.5rem;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}#loading-text{color:var(--text-secondary);font-size:1.1rem}.share-section{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:1.5rem;margin-bottom:2rem;text-align:center}.share-section.hidden{display:none}.share-section p{margin-bottom:1rem;color:var(--text-secondary)}.share-url{display:flex;gap:.5rem;margin-bottom:1rem}.share-url input{flex:1;font-family:var(--font-mono);font-size:.9rem;padding:.75rem 1rem;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-sm);color:var(--accent-primary)}.hint{font-size:.9rem;color:var(--text-muted);font-style:italic}.error-content{text-align:center}.error-icon{font-size:4rem;display:block;margin-bottom:1rem}.error-content h2{color:var(--error-color)}#error-message{color:var(--text-secondary);margin-bottom:2rem;font-family:var(--font-mono);font-size:.9rem;background:var(--bg-card);padding:1rem;border-radius:var(--radius-sm);border:1px solid var(--border-color)}footer{margin-top:3rem;padding-top:1.5rem;border-top:1px solid var(--border-color);text-align:center}footer p{color:var(--text-muted);font-size:.9rem}.mobile-warning{position:fixed;inset:0;background:var(--bg-primary);z-index:1000;display:flex;align-items:center;justify-content:center;padding:2rem}.mobile-warning.hidden{display:none}.mobile-warning-content{text-align:center;max-width:400px}.mobile-warning .warning-icon{font-size:4rem;display:block;margin-bottom:1.5rem}.mobile-warning h2{color:var(--accent-primary);margin-bottom:1rem}.mobile-warning p{color:var(--text-secondary);margin-bottom:1rem;line-height:1.6}.mobile-warning .hint{color:var(--text-muted);font-size:.9rem;margin-bottom:2rem}.mobile-warning .btn{min-width:200px}@media(max-width:600px){.container{padding:1.5rem}.game-modes{grid-template-columns:1fr}.mode-btn{padding:2rem 1.5rem}.button-group{flex-direction:column}.btn{width:100%}.share-url{flex-direction:column}}