:root{--zju-blue: #0055A2;--zju-gold: #E6A100;--zju-gray: #F5F5F5;--text-dark: #333333;--text-light: #666666;--white: #FFFFFF;--shadow: 0 4px 12px rgba(0, 0, 0, .1);--border-color: #E1E6ED;--success-color: #52c41a;--error-color: #ff4d4f}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:PingFang SC,Microsoft YaHei,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.6;color:var(--text-dark);background-color:var(--white);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.container{max-width:1200px;margin:0 auto;padding:0 20px}a{text-decoration:none;color:inherit}ul{list-style:none}img{max-width:100%;height:auto}.section{padding:80px 0}.section-title{text-align:center;margin-bottom:60px}.section-title h2{font-size:32px;font-weight:700;color:var(--zju-blue);margin-bottom:15px}.section-title p{font-size:16px;color:var(--text-light);max-width:600px;margin:0 auto}.btn{display:inline-block;padding:12px 30px;background-color:var(--zju-gold);color:var(--white);border-radius:4px;font-weight:500;transition:all .3s;border:none;cursor:pointer;font-size:14px}.btn:hover{background-color:#d19100;transform:translateY(-2px);box-shadow:0 4px 12px #e6a1004d}.btn-secondary{background-color:transparent;border:2px solid var(--white);margin-left:15px}.btn-secondary:hover{background-color:var(--white);color:var(--zju-blue)}.btn-sm{padding:6px 16px;font-size:11px}.fade-in{opacity:0;transform:translateY(20px);animation:fadeIn .8s ease forwards}@keyframes fadeIn{to{opacity:1;transform:translateY(0)}}.delay-1{animation-delay:.2s}.delay-2{animation-delay:.4s}.delay-3{animation-delay:.6s}@media(max-width:768px){.section{padding:60px 0}.section-title h2{font-size:24px}.container{padding:0 15px}}