*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color:#06f;--text-primary:#111;--text-secondary:#666;--text-light:#999;--bg-primary:#fff;--bg-secondary:#f7f8fa;--bg-tertiary:#f0f2f5;--border-color:#e5e6eb;--shadow-sm:0 2px 8px rgba(0,0,0,.04);--shadow-md:0 4px 24px rgba(0,0,0,.08);--shadow-lg:0 8px 40px rgba(0,0,0,.12);--transition:all .4s cubic-bezier(.25,.46,.45,.94)}html{scroll-behavior:smooth}body{font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Helvetica Neue,Arial,sans-serif;line-height:1.6;background-color:var(--bg-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a,body{color:var(--text-primary)}a{text-decoration:none;transition:var(--transition)}a:hover{color:var(--primary-color)}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.2}h1{font-size:4.5rem;letter-spacing:-.02em}h1,h2{font-weight:700}h2{font-size:3rem;letter-spacing:-.01em}h3{font-size:1.75rem;font-weight:600}.container{max-width:1280px;margin:0 auto;padding:0 40px}.section{padding:120px 0}.section-title{text-align:center;margin-bottom:80px}.section-title h2{margin-bottom:16px}.section-title p{color:var(--text-secondary);font-size:1.125rem;max-width:600px;margin:0 auto;line-height:1.8}.btn{display:inline-flex;align-items:center;justify-content:center;padding:16px 40px;border-radius:8px;font-size:1rem;font-weight:500;cursor:pointer;border:none;transition:var(--transition)}.btn-primary{background:var(--primary-color);color:#fff}.btn-primary:hover{background:#0052cc;color:#fff;transform:translateY(-2px);box-shadow:var(--shadow-md)}.btn-secondary{background:transparent;color:var(--text-primary);border:1px solid var(--border-color)}.btn-secondary:hover{background:var(--bg-secondary);border-color:var(--text-primary)}.card{background:var(--bg-primary);border-radius:16px;padding:48px;border:1px solid var(--border-color);transition:var(--transition)}.card:hover{border-color:var(--primary-color);box-shadow:var(--shadow-lg);transform:translateY(-4px)}.grid{display:grid;gap:32px}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}@media(max-width:968px){h1{font-size:2.5rem}h2{font-size:2rem}.container{padding:0 24px}.section{padding:80px 0}.grid-3,.grid-4{grid-template-columns:1fr}}