:root {
            --primary: #1652f0;
            --secondary: #14c8a9;
            --dark: #0a0b1a;
            --light: #f8f9fe;
            --text: #1e2028;
            --text-light: #6b7280;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
        }
        body {
            background-color: var(--light);
            color: var(--text);
            line-height: 1.6;
            font-size: 16px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        /* 顶部导航 */
        .navbar {
            background-color: white;
            box-shadow: 0 1px 3px 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: 36px;
            margin-right: 12px;
        }
        .logo-text {
            font-size: 22px;
            font-weight: 700;
            color: var(--dark);
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .nav-menu {
            display: flex;
            list-style: none;
        }
        .nav-menu li {
            margin-left: 28px;
            position: relative;
        }
        .nav-menu a {
            color: var(--text);
            text-decoration: none;
            font-weight: 500;
            font-size: 15px;
            transition: all 0.3s;
            padding: 8px 0;
        }
        .nav-menu a:hover {
            color: var(--primary);
        }
        .nav-menu a.active {
            color: var(--primary);
            font-weight: 600;
        }
        .nav-menu a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
        }
        .auth-buttons .btn {
            margin-left: 15px;
        }
        /* 按钮样式 */
        .btn {
            display: inline-block;
            padding: 10px 24px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            font-size: 15px;
            transition: all 0.3s;
        }
        .btn-primary {
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            color: white;
            box-shadow: 0 4px 12px rgba(22, 82, 240, 0.2);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(22, 82, 240, 0.3);
        }
        .btn-outline {
            border: 1.5px solid var(--primary);
            color: var(--primary);
        }
        .btn-outline:hover {
            background-color: rgba(22, 82, 240, 0.05);
        }
        /* 英雄区域 */
        .hero {
            padding: 100px 0;
            background: url('../images/photo-1639762681057-408e52192e55.avif') no-repeat center center;
            background-size: cover;
            position: relative;
            color: white;
            text-align: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(10, 11, 26, 0.7);
        }
        .hero-content {
            position: relative;
            z-index: 1;
            max-width: 800px;
            margin: 0 auto;
        }
        .hero h1 {
            font-size: 48px;
            margin-bottom: 20px;
            font-weight: 700;
            line-height: 1.2;
        }
        .hero p {
            font-size: 18px;
            color: rgba(255,255,255,0.9);
            margin-bottom: 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);
            margin-bottom: 15px;
            font-weight: 700;
        }
        .section-title p {
            color: var(--text-light);
            max-width: 700px;
            margin: 0 auto;
            font-size: 17px;
        }
        /* 特性网格 */
        .features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }
        .feature {
            background: white;
            border-radius: 12px;
            padding: 40px 30px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.03);
            transition: all 0.3s;
        }
        .feature:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.08);
        }
        .feature-icon {
            width: 60px;
            height: 60px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 25px;
            background: linear-gradient(135deg, rgba(22, 82, 240, 0.1), rgba(20, 200, 169, 0.1));
        }
        .feature-icon i {
            font-size: 24px;
            color: var(--primary);
        }
        .feature h3 {
            font-size: 20px;
            margin-bottom: 15px;
            color: var(--dark);
        }
        /* 交易对 */
        .trading-section {
            background-color: white;
        }
        .pairs {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
        }
        .pair {
            background: var(--light);
            padding: 25px;
            border-radius: 10px;
            text-align: center;
            transition: all 0.3s;
        }
        .pair:hover {
            background: linear-gradient(135deg, rgba(22, 82, 240, 0.05), rgba(20, 200, 169, 0.05));
        }
        .pair h4 {
            font-size: 18px;
            margin-bottom: 8px;
        }
        .pair p {
            color: var(--text-light);
            font-size: 14px;
        }
        /* 安全部分 */
        .security-badge {
            display: inline-block;
            background: linear-gradient(90deg, var(--secondary), #0e9f8a);
            color: white;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            margin-top: 15px;
        }
        /* 底部 */
        footer {
            background-color: var(--dark);
            color: white;
            padding: 80px 0 40px;
        }
        .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;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .footer-about {
            color: rgba(255,255,255,0.7);
            margin-bottom: 20px;
            line-height: 1.7;
        }
        .footer-column h3 {
            font-size: 18px;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
            color: white;
        }
        .footer-column h3::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 40px;
            height: 2px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: rgba(255,255,255,0.7);
            text-decoration: none;
            transition: color 0.3s;
            font-size: 14px;
        }
        .footer-links a:hover {
            color: white;
        }
        .social-links {
            display: flex;
            margin-top: 20px;
        }
        .social-links a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255,255,255,0.1);
            color: white;
            margin-right: 10px;
            transition: all 0.3s;
        }
        .social-links a:hover {
            background: var(--primary);
            transform: translateY(-3px);
        }
        .footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: rgba(255,255,255,0.5);
            font-size: 14px;
        }
        /* 响应式调整 */
        @media (max-width: 992px) {
            .nav-container {
                flex-direction: column;
            }
            .nav-menu {
                margin: 20px 0;
            }
            .nav-menu li {
                margin: 0 15px;
            }
            .auth-buttons {
                margin-top: 20px;
            }
            .hero h1 {
                font-size: 36px;
            }
            .hero p {
                font-size: 16px;
            }
        }
        @media (max-width: 768px) {
            .section {
                padding: 60px 0;
            }
            .section-title h2 {
                font-size: 30px;
            }
        }