* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Helvetica Neue', Arial, sans-serif;
        }
        
        body {
            background-color: #f8f9fa;
            color: #333;
            line-height: 1.6;
            padding: 40px 20px;
            min-height: 100vh;
            position: relative;
            padding-bottom: 100px; /* 为底部动画留出空间 */
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
        }
        
        .header {
            text-align: center;
            margin-bottom: 60px;
        }
        
        .header h1 {
            font-size: 2.8rem;
            font-weight: 300;
            color: #2c3e50;
            margin-bottom: 15px;
            letter-spacing: 1px;
        }
        
        .header p {
            font-size: 1.2rem;
            color: #7f8c8d;
            max-width: 700px;
            margin: 0 auto;
        }
        
        .box-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin-bottom: 60px;
        }
        
        .box {
            background: white;
            border-radius: 12px;
            padding: 40px 30px;
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            position: relative;
            overflow: hidden;
        }
        
        .box:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        
        .box::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 6px;
        }
        
        .box-1::before {
            background: linear-gradient(90deg, #3498db, #9b59b6);
        }
        
        .box-2::before {
            background: linear-gradient(90deg, #2ecc71, #3498db);
        }
        
        .box-3::before {
            background: linear-gradient(90deg, #e74c3c, #e67e22);
        }
        
        .box-4::before {
            background: linear-gradient(90deg, #f1c40f, #2ecc71);
        }
        
        .box h2 {
            font-size: 1.5rem;
            margin-bottom: 20px;
            color: #2c3e50;
            font-weight: 600;
            padding-bottom: 10px;
            border-bottom: 1px solid #eee;
        }
        
        .box ul {
            list-style-type: none;
        }
        
        .box li {
            padding: 8px 0;
            color: #555;
            position: relative;
            padding-left: 25px;
        }
        
        .box li:before {
            content: "•";
            color: #3498db;
            font-weight: bold;
            display: inline-block;
            width: 1em;
            margin-left: -1em;
            position: absolute;
            left: 0;
        }
        
        .box-2 li:before {
            color: #2ecc71;
        }
        
        .box-3 li:before {
            color: #e74c3c;
        }
        
        .box-4 li:before {
            color: #f1c40f;
        }
        
        /* 底部动画效果 */
        .footer-animation {
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 80px;
            background: linear-gradient(90deg, #3498db, #9b59b6, #2ecc71, #e74c3c, #f1c40f);
            z-index: 100;
            overflow: hidden;
        }
        
        .wave {
            position: absolute;
            width: 200%;
            height: 100%;
            background: url('data:image/svg+xml;utf8,<svg viewBox="0 0 1200 120" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="none"><path d="M0,0V46.29c47.79,22.2,103.59,32.17,158,28,70.36-5.37,136.33-33.31,206.8-37.5C438.64,32.43,512.34,53.67,583,72.05c69.27,18,138.3,24.88,209.4,13.08,36.15-6,69.85-17.84,104.45-29.34C989.49,25,1113-14.29,1200,52.47V0Z" opacity=".25" fill="white"/><path d="M0,0V15.81C13,36.92,27.64,56.86,47.69,72.05,99.41,111.27,165,111,224.58,91.58c31.15-10.15,60.09-26.07,89.67-39.8,40.92-19,84.73-46,130.83-49.67,36.26-2.85,70.9,9.42,98.6,31.56,31.77,25.39,62.32,62,103.63,73,40.44,10.79,81.35-6.69,119.13-24.28s75.16-39,116.92-43.05c59.73-5.85,113.28,22.88,168.9,38.84,30.2,8.66,59,6.17,87.09-7.5,22.43-10.89,48-26.93,60.65-49.24V0Z" opacity=".5" fill="white"/><path d="M0,0V5.63C149.93,59,314.09,71.32,475.83,42.57c43-7.64,84.23-20.12,127.61-26.46,59-8.63,112.48,12.24,165.56,35.4C827.93,77.22,886,95.24,951.2,90c86.53-7,172.46-45.71,248.8-84.81V0Z" fill="white"/></svg>') repeat-x;
            animation: wave 10s linear infinite;
            transform: translate3d(0, 0, 0);
            opacity: 0.8;
        }
        
        .wave:nth-of-type(2) {
            animation: wave 15s linear infinite reverse;
            opacity: 0.5;
        }
        
        .wave:nth-of-type(3) {
            animation: wave 20s linear infinite;
            opacity: 0.3;
        }
        
        @keyframes wave {
            0% { transform: translateX(0); }
            100% { transform: translateX(-50%); }
        }
        
        .bubbles {
            position: absolute;
            width: 100%;
            height: 100%;
            z-index: 1;
        }
        
        .bubble {
            position: absolute;
            bottom: 0;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            animation: rise 10s infinite ease-in;
        }
        
        .bubble:nth-child(1) {
            width: 20px;
            height: 20px;
            left: 10%;
            animation-duration: 8s;
        }
        
        .bubble:nth-child(2) {
            width: 15px;
            height: 15px;
            left: 20%;
            animation-duration: 12s;
            animation-delay: 1s;
        }
        
        .bubble:nth-child(3) {
            width: 25px;
            height: 25px;
            left: 35%;
            animation-duration: 10s;
            animation-delay: 2s;
        }
        
        .bubble:nth-child(4) {
            width: 10px;
            height: 10px;
            left: 50%;
            animation-duration: 15s;
            animation-delay: 0s;
        }
        
        .bubble:nth-child(5) {
            width: 18px;
            height: 18px;
            left: 65%;
            animation-duration: 11s;
            animation-delay: 1s;
        }
        
        .bubble:nth-child(6) {
            width: 12px;
            height: 12px;
            left: 80%;
            animation-duration: 14s;
            animation-delay: 3s;
        }
        
        .bubble:nth-child(7) {
            width: 22px;
            height: 22px;
            left: 90%;
            animation-duration: 9s;
            animation-delay: 2s;
        }
        
        @keyframes rise {
            0% {
                bottom: 0;
                transform: translateX(0);
                opacity: 0;
            }
            50% {
                transform: translateX(50px);
                opacity: 0.8;
            }
            100% {
                bottom: 100%;
                transform: translateX(-50px);
                opacity: 0;
            }
        }