:root {
    --primary: #1a56db;
    --primary-dark: #1e40af;
    --secondary: #046c4e;
    --accent: #e53e3e;
    --light: #f8fafc;
    --dark: #1e293b;
    --gray: #64748b;
    --gray-light: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 8px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background-color: #f8fafc;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
.header {
    background: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

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

.logo-img {
    height: 50px;
    width: auto;
}

.logo-text h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 2px;
}

.logo-text p {
    font-size: 0.8rem;
    color: var(--gray);
}

.nav {
    display: flex;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--radius);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    background: var(--primary);
    color: white;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 50px;
    margin-bottom: 40px;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.8;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: var(--transition);
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: white;
    color: var(--primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: var(--primary);
}

/* 通用样式 */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 50px;
    color: var(--dark);
}

/* 分类网格 */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.category-card {
    background: white;
    padding: 40px 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.category-card i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 20px;
}

.category-card h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.category-card p {
    color: var(--gray);
    margin-bottom: 15px;
}

.category-badge {
    background: var(--accent);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* 证书网格 */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.cert-card {
    background: white;
    border-radius: var(--radius);
    padding: 25px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--gray-light);
    cursor: pointer;
}

.cert-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.cert-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
}

.cert-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--dark);
    line-height: 1.3;
}

.cert-badge {
    background: var(--secondary);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.cert-description {
    color: var(--gray);
    margin-bottom: 20px;
    line-height: 1.5;
}

.cert-features {
    list-style: none;
    margin-bottom: 20px;
}

.cert-features li {
    padding: 8px 0;
    border-bottom: 1px solid #f1f5f9;
    display: flex;
    align-items: center;
    gap: 10px;
}

.cert-features li:last-child {
    border-bottom: none;
}

.cert-features i {
    color: var(--primary);
    width: 16px;
}

.cert-pricing {
    background: #f0f9ff;
    padding: 15px;
    border-radius: var(--radius);
    margin-top: 15px;
}

.price-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
}

.student-price {
    color: var(--accent);
    font-weight: 700;
    font-size: 1.1rem;
}

.agent-rebate {
    color: var(--secondary);
    font-weight: 700;
}

/* 优势网格 */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.advantage-card {
    background: white;
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.advantage-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.advantage-card i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 20px;
}

.advantage-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
}

/* 底部样式 */
.footer {
    background: var(--dark);
    color: white;
    padding: 50px 0 20px;
    margin-top: 50px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-section h3 {
    margin-bottom: 20px;
    color: #fbbf24;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: #cbd5e1;
    text-decoration: none;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: white;
}

.contact-info li {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.contact-info i {
    width: 16px;
}

.qrcode {
    width: 120px;
    height: 120px;
    background: white;
    padding: 10px;
    border-radius: var(--radius);
}

.qrcode img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #374151;
    color: #9ca3af;
}

/* 证书筛选 */
.certificate-filter {
    background: white;
    padding: 40px 0;
    box-shadow: var(--shadow);
}

.page-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--dark);
}

.filter-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.filter-tab {
    padding: 12px 24px;
    background: white;
    border: 2px solid var(--gray-light);
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.filter-tab.active,
.filter-tab:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.search-box {
    position: relative;
    max-width: 400px;
    margin: 0 auto;
}

.search-box input {
    width: 100%;
    padding: 12px 45px 12px 20px;
    border: 2px solid var(--gray-light);
    border-radius: var(--radius);
    font-size: 1rem;
}

.search-box i {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray);
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 30px;
    border-radius: var(--radius);
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.close {
    position: absolute;
    right: 20px;
    top: 15px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    color: var(--gray);
}

.close:hover {
    color: var(--dark);
}

/* 渠道合作页面特定样式 */
.agent-hero {
    background: linear-gradient(135deg, var(--secondary) 0%, #065f46 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.agent-hero-content h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.agent-subtitle {
    font-size: 1.3rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

.agent-stats {
    display: flex;
    justify-content: center;
    gap: 50px;
}

.agent-stat {
    text-align: center;
}

.agent-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.agent-label {
    font-size: 1rem;
    opacity: 0.8;
}

.coop-advantage {
    background: white;
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.coop-advantage:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.coop-advantage i {
    font-size: 2.5rem;
    color: var(--secondary);
    margin-bottom: 20px;
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.process-step {
    text-align: center;
    position: relative;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 20px;
}

.policy-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.policy-card {
    background: white;
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 2px solid transparent;
}

.policy-card.featured {
    border-color: var(--primary);
    transform: scale(1.05);
}

.policy-card h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.policy-card ul {
    list-style: none;
}

.policy-card ul li {
    padding: 8px 0;
    border-bottom: 1px solid var(--gray-light);
}

.policy-card ul li:last-child {
    border-bottom: none;
}

.contact-form-section {
    background: white;
    padding: 50px 0;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group input,
.form-group textarea {
    padding: 12px 15px;
    border: 2px solid var(--gray-light);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.btn.full-width {
    grid-column: 1 / -1;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav {
        gap: 15px;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-stats,
    .agent-stats {
        flex-direction: column;
        gap: 30px;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .cert-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-tabs {
        flex-direction: column;
        align-items: center;
    }
    
    .contact-form {
        grid-template-columns: 1fr;
    }
    
    .policy-card.featured {
        transform: none;
    }
}