:root{--black: #000000;--gray-900: #1a1a1a;--gray-800: #2d2d2d;--gray-700: #404040;--gray-600: #666666;--gray-500: #808080;--gray-400: #a0a0a0;--gray-300: #c0c0c0;--gray-200: #e0e0e0;--gray-100: #f0f0f0;--white: #ffffff;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1);--transition: .3s ease-in-out}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:linear-gradient(135deg,var(--gray-100) 0%,var(--white) 100%);color:var(--gray-900);line-height:1.6}h1,h2,h3{font-weight:300;letter-spacing:-.02em;color:var(--black)}::-webkit-scrollbar{width:10px}::-webkit-scrollbar-track{background:var(--gray-100)}::-webkit-scrollbar-thumb{background:var(--gray-400);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--gray-600)}