:root {
            --primary-color: #4361ee;
            --secondary-color: #3f37c9;
            --accent-color: #4895ef;
            --dark-color: #1a1a2e;
            --light-color: #f8f9fa;
            --success-color: #4cc9f0;
            --warning-color: #f72585;
            --gray-color: #6c757d;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Noto Sans SC', sans-serif;
            background-color: #f5f7fa;
            color: #333;
            line-height: 1.6;
        }
        
/* 导航栏样式 */
.navbar {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(8px);
    padding: 12px 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s ease;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 15px;
}

.nav-logo {
    display: flex;
    align-items: center;
}

.nav-logo img {
    height: 40px;
    margin-right: 12px;
}

.nav-logo h2 {
    color: var(--dark-color);
    margin: 0;
    font-size: 22px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    align-items: center;
}

.nav-menu li {
    margin-left: 25px;
    position: relative;
}

.nav-menu a {
    color: var(--dark-color);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 6px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-menu a:not(.btn):hover {
    color: var(--primary-color);
}

/* 默认(桌面端)下划线动画 - 居中 */
.nav-menu a:not(.btn)::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-menu a:not(.btn):hover::after {
    width: 60%;
}

.nav-menu a.active {
    color: var(--primary-color);
    font-weight: 600;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 30px;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(67, 97, 238, 0.3);
    color: white;
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(67, 97, 238, 0.3);
}

.mobile-menu-btn {
    display: none;
    font-size: 24px;
    cursor: pointer;
}

/* 响应式设计 - 移动端 */
@media (max-width: 768px) {
    .navbar {
        padding: 10px 0;
    }
    
    .mobile-menu-btn {
        display: block;
        z-index: 1001;
    }
    
    .nav-menu {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        z-index: 1000;
    }
    
    .nav-menu.show {
        display: flex;
    }
    
    .nav-menu li {
        margin: 10px 0;
        width: 100%;
    }
    
    .nav-menu a {
        display: block;
        padding: 12px 15px;
    }
    
    /* 移动端下划线动画 - 居左 */
    .nav-menu a:not(.btn)::after {
        left: 15px; /* 与padding保持一致 */
        transform: none;
        width: 0;
        height: 2px;
        background: var(--primary-color);
        transition: width 0.3s ease;
    }
    
    .nav-menu a:not(.btn):hover::after {
        width: calc(100% - 30px); /* 减去左右padding */
    }
    
    .nav-menu .btn {
        width: 100%;
        margin: 5px 0;
        text-align: center;
    }
}
/* 状态徽章 */
        .status-badge {
            display: inline-block;
            margin: 0 10px;
            font-size: 14px;
            border-radius: 4px;
            overflow: hidden;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        
        .status-subject {
            display: inline-block;
            padding: 5px 10px;
            background-color: #f8f9fa;
            color: #333;
            font-weight: bold;
        }
        
        .status-value {
            display: inline-block;
            padding: 5px 10px;
            color: white;
        }
        
        .bg-online {
            background-color: #28a745;
        }
        
        .bg-offline {
            background-color: #dc3545;
        }
        
        .bg-refresh {
            background-color: #007bff;
        }
        /* 英雄区域 */
        .hero {
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            padding: 180px 0 100px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        
        .hero-content {
            position: relative;
            z-index: 1;
            max-width: 800px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        .hero h1 {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 20px;
            color: var(--dark-color);
            line-height: 1.2;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .hero p {
            font-size: 1.25rem;
            color: var(--gray-color);
            margin-bottom: 40px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }
        
        .hero-buttons {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-top: 30px;
        }
        
        /* 特色部分 */
        .features {
            padding: 100px 0;
            background-color: white;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 60px;
        }
        
        .section-title h2 {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--dark-color);
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }
        
        .section-title h2::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 2px;
        }
        
        .section-title p {
            color: var(--gray-color);
            font-size: 1.1rem;
            max-width: 700px;
            margin: 0 auto;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        .feature-card {
            background: white;
            border-radius: 12px;
            padding: 40px 30px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
            text-align: center;
            border: 1px solid rgba(0, 0, 0, 0.03);
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(67, 97, 238, 0.1);
        }
        
        .feature-icon {
            width: 80px;
            height: 80px;
            margin: 0 auto 25px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(67, 97, 238, 0.1), rgba(63, 55, 201, 0.1));
            border-radius: 50%;
            color: var(--primary-color);
            font-size: 36px;
        }
        
        .feature-card h3 {
            font-size: 1.5rem;
            margin-bottom: 15px;
            color: var(--dark-color);
        }
        
        .feature-card p {
            color: var(--gray-color);
            font-size: 1rem;
        }
        
        /* 工作原理部分 */
        .how-it-works {
            padding: 100px 0;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            position: relative;
        }
        
        .steps {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            max-width: 1200px;
            margin: 60px auto 0;
            padding: 0 20px;
            position: relative;
        }
        
        .step {
            flex: 1;
            min-width: 250px;
            max-width: 300px;
            padding: 40px 30px;
            background: white;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            margin: 15px;
            position: relative;
            z-index: 1;
            transition: all 0.3s ease;
            text-align: center;
            border: 1px solid rgba(0, 0, 0, 0.03);
        }
        
        .step:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(67, 97, 238, 0.1);
        }
        
        .step-number {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 20px;
            margin: 0 auto 25px;
            box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
        }
        
        .step h3 {
            font-size: 1.3rem;
            margin-bottom: 15px;
            color: var(--dark-color);
        }
        
        .step p {
            color: var(--gray-color);
            font-size: 1rem;
        }
        /* 页脚 */
        .footer {
            background: var(--dark-color);
            color: white;
            padding: 60px 0 30px;
            text-align: center;
        }
        
        .footer-links {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            margin-bottom: 30px;
        }
        
        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            margin: 0 15px;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        
        .footer-links a:hover {
            color: white;
        }
        
        .footer p {
            color: rgba(255, 255, 255, 0.5);
            margin-top: 20px;
            font-size: 0.9rem;
        }
        
        .footer p a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        
        .footer p a:hover {
            color: white;
        }
        /* 状态徽章 */
        .status-badge {
            display: inline-block;
            margin: 0 10px;
            font-size: 14px;
            border-radius: 4px;
            overflow: hidden;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        
        .status-subject {
            display: inline-block;
            padding: 5px 10px;
            background-color: #f8f9fa;
            color: #333;
            font-weight: bold;
        }
        
        .status-value {
            display: inline-block;
            padding: 5px 10px;
            color: white;
        }
        
        .bg-online {
            background-color: #28a745;
        }
        
        .bg-offline {
            background-color: #dc3545;
        }
        
        .bg-refresh {
            background-color: #007bff;
        }
        /* 返回顶部按钮 */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            box-shadow: 0 5px 20px rgba(67, 97, 238, 0.3);
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 999;
        }
        
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        
        .back-to-top:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(67, 97, 238, 0.4);
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .pricing-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .pricing-card:last-child {
                grid-column: span 2;
                max-width: 400px;
                margin: 0 auto;
            }
            
            .steps {
                flex-direction: column;
                align-items: center;
            }
            
            .step {
                max-width: 100%;
                margin-bottom: 30px;
            }
        }
        
        @media (max-width: 768px) {
            .navbar {
                padding: 10px 0;
            }
            
            .mobile-menu-btn {
                display: block;
            }
            
            .nav-menu {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: white;
                flex-direction: column;
                padding: 20px;
                box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
            }
            
            .nav-menu.show {
                display: flex;
            }
            
            .nav-menu li {
                margin: 10px 0;
            }
            
            .hero {
                padding: 150px 0 80px;
            }
            
            .hero h1 {
                font-size: 2.2rem;
            }
            
            .hero p {
                font-size: 1rem;
            }
            
            .hero-buttons {
                flex-direction: column;
                gap: 15px;
            }
            
            .btn {
                width: 100%;
            }
            
            .section-title h2 {
                font-size: 2rem;
            }
        }
        
        /* 关于我们特有样式 */
        .about-header {
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            padding: 150px 0 80px;
            text-align: center;
            position: relative;
        }
        
        .about-header h1 {
            font-size: 2.8rem;
            font-weight: 700;
            margin-bottom: 20px;
            color: var(--dark-color);
            line-height: 1.2;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .about-header p {
            font-size: 1.1rem;
            color: var(--gray-color);
            max-width: 700px;
            margin: 0 auto;
        }
        
        .about-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 60px 20px;
        }
        
        .about-section {
            background: white;
            border-radius: 12px;
            padding: 40px;
            margin-bottom: 40px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        
        .about-section h2 {
            font-size: 1.8rem;
            color: var(--dark-color);
            margin-bottom: 20px;
            padding-bottom: 15px;
            border-bottom: 1px solid #eee;
        }
        
        .about-section h3 {
            font-size: 1.4rem;
            color: var(--dark-color);
            margin: 25px 0 15px;
        }
        
        .about-section p {
            margin-bottom: 15px;
            color: var(--gray-color);
            line-height: 1.7;
        }
        
        .mission-values {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            margin-top: 30px;
        }
        
        .value-card {
            flex: 1;
            min-width: 250px;
            background: white;
            border-radius: 12px;
            padding: 25px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            text-align: center;
            transition: all 0.3s ease;
            border: 1px solid rgba(67, 97, 238, 0.1);
        }
        
        .value-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(67, 97, 238, 0.1);
            border-color: rgba(67, 97, 238, 0.3);
        }
        
        .value-icon {
            width: 60px;
            height: 60px;
            margin: 0 auto 15px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(67, 97, 238, 0.1), rgba(63, 55, 201, 0.1));
            border-radius: 50%;
            color: var(--primary-color);
            font-size: 24px;
        }
        
        .value-card h3 {
            font-size: 1.2rem;
            margin-bottom: 10px;
            color: var(--dark-color);
        }
        
        .team-members {
            display: flex;
            flex-wrap: wrap;
            gap: 30px;
            margin-top: 30px;
            justify-content: center;
        }
        
        .team-card {
            flex: 0 0 340px;
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
            text-align: center;
        }
        
        .team-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(67, 97, 238, 0.1);
        }
        
        .team-photo {
            width: 100%;
            height: 250px;
            object-fit: cover;
        }
        
        .team-info {
            padding: 20px;
        }
        
        .team-info h3 {
            font-size: 1.2rem;
            margin-bottom: 5px;
            color: var(--dark-color);
        }
        
        .team-info p {
            color: var(--gray-color);
            font-size: 0.9rem;
            margin-bottom: 15px;
        }
        
        .social-links {
            display: flex;
            justify-content: center;
            gap: 15px;
        }
        
        .social-links a {
            color: var(--gray-color);
            transition: color 0.3s ease;
        }
        
        .social-links a:hover {
            color: var(--primary-color);
        }
        
        .timeline {
            position: relative;
            max-width: 800px;
            margin: 40px auto 0;
            padding-left: 30px;
        }
        
        .timeline::before {
            content: '';
            position: absolute;
            top: 0;
            left: 15px;
            height: 100%;
            width: 2px;
            background: transparent;
        }
        
        .timeline-item {
            position: relative;
            margin-bottom: 40px;
            padding-left: 30px;
        }
        
        .timeline-date {
            position: absolute;
            left: -30px;
            top: 0;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--primary-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 0.8rem;
        }
        
        .timeline-content {
            background: white;
            border-radius: 8px;
            padding: 20px;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
        }
        
        .timeline-content h3 {
            font-size: 1.2rem;
            margin-bottom: 10px;
            color: var(--dark-color);
        }
        
        .timeline-content p {
            color: var(--gray-color);
            font-size: 0.9rem;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .about-header h1 {
                font-size: 2.2rem;
            }
            
            .about-section {
                padding: 25px;
            }
            
            .value-card {
                min-width: 100%;
            }
            
            .team-card {
                flex: 0 0 100%;
                max-width: 300px;
            }
        }
        /* 帮助中心特有样式 */
        .help-header {
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            padding: 150px 0 80px;
            text-align: center;
            position: relative;
        }
        
        .help-header h1 {
            font-size: 2.8rem;
            font-weight: 700;
            margin-bottom: 20px;
            color: var(--dark-color);
            line-height: 1.2;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .help-header p {
            font-size: 1.1rem;
            color: var(--gray-color);
            max-width: 700px;
            margin: 0 auto;
        }
        
        .help-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 60px 20px;
            display: flex;
            flex-wrap: wrap;
        }
        
        .help-sidebar {
            flex: 0 0 250px;
            padding-right: 30px;
        }
        
        .help-content {
            flex: 1;
            min-width: 0;
        }
        
        .help-nav {
            position: sticky;
            top: 100px;
        }
        
        .help-nav h3 {
            font-size: 1.2rem;
            color: var(--dark-color);
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary-color);
        }
        
        .help-nav ul {
            list-style: none;
        }
        
        .help-nav li {
            margin-bottom: 8px;
        }
        
        .help-nav a {
            display: block;
            padding: 8px 12px;
            color: var(--gray-color);
            text-decoration: none;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        
        .help-nav a:hover, .help-nav a.active {
            color: var(--primary-color);
            background: rgba(67, 97, 238, 0.1);
        }
        
        .help-section {
            background: white;
            border-radius: 12px;
            padding: 40px;
            margin-bottom: 30px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        
        .help-section h2 {
            font-size: 1.8rem;
            color: var(--dark-color);
            margin-bottom: 20px;
            padding-bottom: 15px;
            border-bottom: 1px solid #eee;
        }
        
        .help-section h3 {
            font-size: 1.4rem;
            color: var(--dark-color);
            margin: 25px 0 15px;
        }
        
        .help-section p {
            margin-bottom: 15px;
            color: var(--gray-color);
            line-height: 1.7;
        }
        
        .help-section ul, .help-section ol {
            margin-bottom: 20px;
            padding-left: 20px;
        }
        
        .help-section li {
            margin-bottom: 10px;
            color: var(--gray-color);
        }
        
        .faq-item {
            margin-bottom: 20px;
            border-bottom: 1px solid #eee;
            padding-bottom: 20px;
        }
        
        .faq-question {
            font-weight: 600;
            color: var(--dark-color);
            margin-bottom: 10px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .faq-question::after {
            content: '+';
            font-size: 1.2rem;
        }
        
        .faq-question.active::after {
            content: '-';
        }
        
        .faq-answer {
            display: none;
            padding: 10px 0;
        }
        
        .faq-answer.show {
            display: block;
        }
        
        .contact-methods {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            margin-top: 30px;
        }
        
        .contact-card {
            flex: 1;
            min-width: 250px;
            background: white;
            border-radius: 12px;
            padding: 25px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            text-align: center;
            transition: all 0.3s ease;
        }
        
        .contact-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(67, 97, 238, 0.1);
        }
        
        .contact-icon {
            width: 60px;
            height: 60px;
            margin: 0 auto 15px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(67, 97, 238, 0.1), rgba(63, 55, 201, 0.1));
            border-radius: 50%;
            color: var(--primary-color);
            font-size: 24px;
        }
        
        .contact-card h3 {
            font-size: 1.2rem;
            margin-bottom: 10px;
            color: var(--dark-color);
        }
        
        .contact-card p {
            color: var(--gray-color);
            margin-bottom: 15px;
        }
        
        .contact-card a {
            display: inline-block;
            padding: 8px 20px;
            background: var(--primary-color);
            color: white;
            border-radius: 30px;
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
        }
        
        .contact-card a:hover {
            background: var(--secondary-color);
            transform: translateY(-2px);
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .help-container {
                flex-direction: column;
            }
            
            .help-sidebar {
                flex: 0 0 auto;
                padding-right: 0;
                margin-bottom: 30px;
            }
            
            .help-nav {
                position: static;
            }
            
            .help-section {
                padding: 25px;
            }
        }
        /* 特色部分 */
        .features {
            padding: 100px 0;
            background-color: white;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 60px;
        }
        
        .section-title h2 {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--dark-color);
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }
        
        .section-title h2::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 2px;
        }
        
        .section-title p {
            color: var(--gray-color);
            font-size: 1.1rem;
            max-width: 700px;
            margin: 0 auto;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        .feature-card {
            background: white;
            border-radius: 12px;
            padding: 40px 30px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
            text-align: center;
            border: 1px solid rgba(0, 0, 0, 0.03);
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(67, 97, 238, 0.1);
        }
        
        .feature-icon {
            width: 80px;
            height: 80px;
            margin: 0 auto 25px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(67, 97, 238, 0.1), rgba(63, 55, 201, 0.1));
            border-radius: 50%;
            color: var(--primary-color);
            font-size: 36px;
        }
        
        .feature-card h3 {
            font-size: 1.5rem;
            margin-bottom: 15px;
            color: var(--dark-color);
        }
        
        .feature-card p {
            color: var(--gray-color);
            font-size: 1rem;
        }
.gradient-alert {
    background: linear-gradient(135deg, #ff4d4d 0%, #f95700 100%);
    color: white;
    padding: 18px 25px;
    border-radius: 8px;
    margin: 30px auto;
    max-width: 1200px;
    box-shadow: 0 4px 20px rgba(255, 77, 77, 0.3);
}

.alert-content {
    display: flex;
    align-items: center;
    gap: 15px;
}

.alert-icon {
    font-size: 28px;
    flex-shrink: 0;
}

.alert-message {
    font-size: 15px;
    line-height: 1.6;
    font-weight: 500;
}        
        /* 工作原理部分 */
        .how-it-works {
            padding: 100px 0;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            position: relative;
        }
        
        .steps {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            max-width: 1200px;
            margin: 60px auto 0;
            padding: 0 20px;
            position: relative;
        }
        
        .step {
            flex: 1;
            min-width: 250px;
            max-width: 300px;
            padding: 40px 30px;
            background: white;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            margin: 15px;
            position: relative;
            z-index: 1;
            transition: all 0.3s ease;
            text-align: center;
            border: 1px solid rgba(0, 0, 0, 0.03);
        }
        
        .step:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(67, 97, 238, 0.1);
        }
        
        .step-number {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 20px;
            margin: 0 auto 25px;
            box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
        }
        
        .step h3 {
            font-size: 1.3rem;
            margin-bottom: 15px;
            color: var(--dark-color);
        }
        
        .step p {
            color: var(--gray-color);
            font-size: 1rem;
        }