*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #1a73e8;--primary-dark: #1557b0;--primary-light: #e8f0fe;--accent: #ff6b35;--bg: #ffffff;--bg-gray: #f8f9fa;--bg-dark: #1a1a2e;--text: #333333;--text-light: #666666;--text-white: #ffffff;--border: #e0e0e0;--shadow: 0 2px 12px rgba(0,0,0,.08);--shadow-lg: 0 8px 30px rgba(0,0,0,.12);--radius: 8px;--radius-lg: 16px;--max-width: 1200px;--header-height: 72px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;color:var(--text);line-height:1.6;background:var(--bg)}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto}.container{max-width:var(--max-width);margin:0 auto;padding:0 24px}.section{padding:80px 0}.section-title{text-align:center;font-size:36px;font-weight:700;margin-bottom:16px;color:var(--text)}.section-subtitle{text-align:center;font-size:16px;color:var(--text-light);margin-bottom:48px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 28px;border-radius:6px;font-size:15px;font-weight:500;cursor:pointer;border:none;transition:all .3s ease}.btn-primary{background:var(--primary);color:var(--text-white)}.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 4px 12px #1a73e866}.btn-outline{background:transparent;color:var(--primary);border:2px solid var(--primary)}.btn-outline:hover{background:var(--primary);color:var(--text-white)}.btn-lg{padding:16px 36px;font-size:16px}.card{background:var(--bg);border-radius:var(--radius-lg);box-shadow:var(--shadow);overflow:hidden;transition:all .3s ease}.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}@media (max-width: 768px){.section{padding:48px 0}.section-title{font-size:28px}.container{padding:0 16px}}