:root {
            --primary-color: #2962ff;
            --secondary-color: #00c853;
            --dark-color: #1a237e;
            --light-color: #e8eaf6;
            --text-color: #212121;
            --text-light: #757575;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
        }
        body {
            background-color: #fafafa;
            color: var(--text-color);
            line-height: 1.7;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        /* 顶部导航 */
        .top-bar {
            background-color: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            padding: 15px 0;
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            display: flex;
            align-items: center;
        }
        .logo img {
            height: 40px;
            margin-right: 10px;
        }
        .logo-text {
            font-size: 24px;
            font-weight: 700;
            color: var(--dark-color);
        }
        .nav-links {
            display: flex;
            list-style: none;
        }
        .nav-links li {
            margin-left: 30px;
        }
        .nav-links a {
            color: var(--text-color);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
        }
        .nav-links a:hover {
            color: var(--primary-color);
        }
        .auth-buttons .btn {
            margin-left: 15px;
        }
        /* 按钮样式 */
        .btn {
            display: inline-block;
            padding: 10px 25px;
            border-radius: 6px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary {
            background-color: var(--primary-color);
            color: white;
        }
        .btn-primary:hover {
            background-color: var(--dark-color);
        }
        .btn-outline {
            border: 2px solid var(--primary-color);
            color: var(--primary-color);
        }
        .btn-outline:hover {
            background-color: var(--light-color);
        }
        /* 英雄区域 */
        .hero {
            padding: 80px 0;
            text-align: center;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
        }
        .hero h1 {
            font-size: 48px;
            margin-bottom: 20px;
            color: var(--dark-color);
        }
        .hero p {
            font-size: 20px;
            color: var(--text-light);
            max-width: 800px;
            margin: 0 auto 40px;
        }
        /* 内容区块 */
        .section {
            padding: 80px 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 60px;
        }
        .section-title h2 {
            font-size: 36px;
            color: var(--dark-color);
            margin-bottom: 15px;
        }
        .section-title p {
            color: var(--text-light);
            max-width: 700px;
            margin: 0 auto;
        }
        /* 特性网格 */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 40px;
        }
        .feature-card {
            background: white;
            border-radius: 12px;
            padding: 40px 30px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .feature-icon {
            font-size: 40px;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .feature-card h3 {
            font-size: 22px;
            margin-bottom: 15px;
            color: var(--dark-color);
        }
        /* 交易对列表 */
        .trading-pairs {
            background-color: var(--light-color);
            padding: 60px 0;
        }
        .pairs-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
        }
        .pair-card {
            background: white;
            padding: 25px;
            border-radius: 8px;
            text-align: center;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
        }
        .pair-card h4 {
            font-size: 18px;
            margin-bottom: 10px;
        }
        /* 安全部分 */
        .security-badge {
            display: inline-block;
            background-color: var(--secondary-color);
            color: white;
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 15px;
        }
        /* 底部 */
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 80px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 50px;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
        }
        .footer-logo img {
            height: 30px;
            margin-right: 10px;
        }
        .footer-logo span {
            font-size: 20px;
            font-weight: 700;
        }
        .footer-column h3 {
            font-size: 18px;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-column h3::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 40px;
            height: 2px;
            background-color: var(--primary-color);
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #b0bec5;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: white;
        }
        .footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #b0bec5;
            font-size: 14px;
        }
        /* 响应式调整 */
        @media (max-width: 768px) {
            .nav-container {
                flex-direction: column;
            }
            .nav-links {
                margin-top: 20px;
            }
            .nav-links li {
                margin: 0 10px;
            }
            .auth-buttons {
                margin-top: 20px;
            }
            .hero h1 {
                font-size: 36px;
            }
            .hero p {
                font-size: 18px;
            }
        }