:root[data-theme=light]{--bg-primary: #ffffff;--bg-secondary: #f3f4f6;--text-primary: #111827;--text-secondary: #6b7280;--border-color: #e5e7eb;--card-bg: #ffffff;--card-hover-shadow: rgba(0, 0, 0, .1)}:root[data-theme=dark]{--bg-primary: #1a1a1a;--bg-secondary: #2d2d2d;--text-primary: #f9fafb;--text-secondary: #9ca3af;--border-color: #404040;--card-bg: #2d2d2d;--card-hover-shadow: rgba(255, 255, 255, .1)}:root{--primary: #10b981;--primary-dark: #059669;--primary-light: #ecfdf5;--primary-lighter: #d1fae5;--gray-50: #f9fafb;--gray-100: #f3f4f6;--gray-200: #e5e7eb;--gray-300: #d1d5db;--gray-400: #9ca3af;--gray-500: #6b7280;--gray-600: #4b5563;--gray-700: #374151;--gray-800: #1f2937;--gray-900: #111827;--success: #10b981;--warning: #f59e0b;--error: #ef4444;--info: #3b82f6;--font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;--font-mono: "SF Mono", "Monaco", "Inconsolata", "Fira Code", "Courier New", monospace;--spacing-xs: 8px;--spacing-sm: 12px;--spacing-md: 20px;--spacing-lg: 30px;--spacing-xl: 40px;--radius-sm: 6px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 10px 10px -5px rgba(0, 0, 0, .04);--transition-fast: .15s ease;--transition-base: .2s ease;--transition-slow: .3s ease}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-base);background:var(--bg-primary);color:var(--text-primary);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;transition:background-color .3s ease,color .3s ease}.btn{display:inline-block;padding:12px 30px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius-md);font-size:1rem;font-weight:600;cursor:pointer;transition:all var(--transition-base);box-shadow:var(--shadow-sm);text-decoration:none;text-align:center}.btn:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn:active{transform:translateY(0);box-shadow:var(--shadow-sm)}.btn-secondary{background:var(--gray-200);color:var(--gray-700)}.btn-secondary:hover{background:var(--gray-300)}.card{background:var(--card-bg);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-md);transition:all .3s ease;border:2px solid var(--border-color);position:relative;overflow:hidden}.card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--primary);transform:scaleX(0);transition:transform .3s ease}.card:hover{transform:translateY(-4px);box-shadow:0 20px 25px -5px var(--card-hover-shadow),0 10px 10px -5px var(--card-hover-shadow);border-color:var(--primary)}.card:hover:before{transform:scaleX(1)}a.card{text-decoration:none;color:var(--text-primary);display:block}.card h2,.card h3{color:var(--text-primary);margin-bottom:12px}.card p{color:var(--text-secondary);line-height:1.7}.card-icon{width:50px;height:50px;background:var(--primary-light);border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;color:var(--primary);font-size:1.5rem;margin-bottom:15px;border:1px solid var(--primary);transition:transform .3s ease;flex-shrink:0}.card:hover .card-icon{transform:scale(1.1)}.card.featured{background:var(--primary-light);border-color:var(--primary)}.card.featured .card-icon{background:var(--primary);color:#fff}.code-block{background:var(--gray-800);color:var(--gray-200);padding:var(--spacing-md);border-radius:var(--radius-lg);font-family:var(--font-mono);font-size:.95rem;overflow-x:auto;margin:15px 0;line-height:1.6;border:1px solid var(--gray-700)}.code-block code{font-family:var(--font-mono)}.code-block .keyword{color:#f472b6}.code-block .property{color:#34d399}.code-block .value{color:#fbbf24}.code-block .comment{color:var(--gray-400);font-style:italic}.inline-code{background:var(--primary-light);padding:2px 6px;border-radius:var(--radius-sm);font-family:var(--font-mono);color:var(--primary-dark);font-size:.9em;font-weight:500}.info-box{background:var(--primary-light);border-left:4px solid var(--primary);padding:15px 20px;border-radius:var(--radius-md);margin:15px 0}.info-box p{margin:0;color:var(--primary-dark);font-weight:500}.warning-box{background:#fef3c7;border-left-color:var(--warning)}.warning-box p{color:#92400e}.error-box{background:#fee2e2;border-left-color:var(--error)}.error-box p{color:#991b1b}.demo-area{min-height:250px;background:var(--gray-100);border:2px dashed var(--gray-300);border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;margin:20px 0;position:relative;overflow:visible;padding:var(--spacing-md)}.demo-box{width:100px;height:100px;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:600;border-radius:var(--radius-lg);transition:transform .8s ease;box-shadow:var(--shadow-md)}.back-link{display:inline-flex;align-items:center;gap:8px;color:var(--primary);text-decoration:none;font-weight:600;padding:10px 16px;border-radius:var(--radius-md);transition:all var(--transition-base);background:var(--primary-light);border:2px solid var(--primary);box-shadow:0 2px 4px var(--card-hover-shadow)}.back-link:hover{background:var(--primary);color:#fff;transform:translate(-3px);box-shadow:0 4px 8px var(--card-hover-shadow)}.container{max-width:1200px;margin:0 auto;padding:0 var(--spacing-md)}.text-center{text-align:center}.mt-sm{margin-top:var(--spacing-sm)}.mt-md{margin-top:var(--spacing-md)}.mt-lg{margin-top:var(--spacing-lg)}.mb-sm{margin-bottom:var(--spacing-sm)}.mb-md{margin-bottom:var(--spacing-md)}.mb-lg{margin-bottom:var(--spacing-lg)}.section-title{color:var(--text-primary);font-size:1.8rem;margin:40px 0 20px;padding-bottom:10px;border-bottom:2px solid var(--border-color);font-weight:700}.demo-card{padding:25px}.demo-card h3{font-size:1.3rem;font-weight:700}.demo-card p{font-size:.95rem}@media (max-width: 768px){:root{--spacing-md: 15px;--spacing-lg: 20px;--spacing-xl: 30px}.btn{padding:10px 25px;font-size:.95rem}.card{padding:var(--spacing-md)}.code-block{font-size:.85rem;padding:15px}.demo-area{min-height:200px}.demo-box{width:80px;height:80px;font-size:.9rem}}@media (max-width: 480px){.demo-box{width:70px;height:70px;font-size:.85rem}}@media (prefers-reduced-motion: reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}.theme-toolbar{position:fixed;top:20px;right:20px;display:flex;gap:10px;z-index:10000}.theme-toolbar-btn{width:44px;height:44px;border-radius:12px;background:var(--card-bg);border:1px solid var(--border-color);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:20px;transition:all .2s ease;box-shadow:0 2px 8px #0000001a}.theme-toolbar-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #00000026;border-color:var(--primary)}.theme-toolbar-btn:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.theme-panel{position:fixed;top:80px;right:20px;width:300px;max-height:80vh;overflow-y:auto;background:var(--card-bg);border:1px solid var(--border-color);border-radius:16px;padding:20px;box-shadow:0 10px 30px #0003;display:none;z-index:9999}.theme-panel.active{display:block;animation:slideIn .3s ease}@keyframes slideIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.theme-panel h3{font-size:1.1rem;margin-bottom:15px;color:var(--text-primary)}.theme-mode-options{display:flex;flex-direction:column;gap:8px}.theme-mode-option{display:flex;align-items:center;gap:8px;padding:10px 12px;border-radius:8px;cursor:pointer;transition:all .2s ease;border:2px solid var(--border-color)}.theme-mode-option:hover{background:var(--bg-secondary);border-color:var(--primary)}.theme-mode-option:has(input:checked){background:var(--primary-light);border-color:var(--primary)}.theme-mode-option:has(input:checked) span{color:var(--primary);font-weight:600}.theme-mode-option input[type=radio]{cursor:pointer}.theme-mode-option span{font-size:.9rem;color:var(--text-primary);font-weight:500}.theme-option{display:flex;align-items:center;gap:10px;padding:10px;border-radius:8px;cursor:pointer;transition:background .2s ease;margin-bottom:8px;border:2px solid transparent}.theme-option:hover{background:var(--bg-secondary)}.theme-option.active{background:var(--primary-light);border-color:var(--primary)}.theme-option.active .theme-option-name,.theme-option.active .theme-option-desc{color:var(--primary)}.color-preview{width:32px;height:32px;border-radius:8px;border:2px solid var(--border-color);flex-shrink:0}.theme-option-text{flex:1}.theme-option-name{font-weight:600;color:var(--text-primary);font-size:.9rem}.theme-option-desc{font-size:.75rem;color:var(--text-secondary)}@media (max-width: 768px){.theme-toolbar{top:10px;right:10px}.theme-toolbar-btn{width:44px;height:44px;font-size:18px}.theme-panel{right:10px;left:10px;width:auto}}.back-to-top{position:fixed;bottom:30px;right:30px;width:50px;height:50px;background:var(--primary);color:#fff;border:none;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:24px;box-shadow:var(--shadow-lg);transition:all var(--transition-base);z-index:9998;opacity:0;visibility:hidden;transform:translateY(20px)}.back-to-top.visible{opacity:1;visibility:visible;transform:translateY(0)}.back-to-top:hover{background:var(--primary-dark);transform:translateY(-5px);box-shadow:var(--shadow-xl)}.back-to-top:active{transform:translateY(-2px)}@media (max-width: 768px){.back-to-top{bottom:20px;right:20px;width:45px;height:45px;font-size:20px}}