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

:root {
    --primary-color: #2196F3;
    --primary-dark: #1976D2;
    --secondary-color: #1565C0;
    --accent-color: #64B5F6;
    --bg-gradient: linear-gradient(135deg, #2196F3 0%, #1565C0 100%);
    --card-bg: #fff;
    --text-primary: #1a1a2e;
    --text-secondary: #5a5a7a;
    --border-color: #e3e3f0;
    --hover-bg: #f0f4ff;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: #f5f7fa;
    min-height: 100vh;
}

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

.header {
    background: var(--card-bg);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 22px;
    font-weight: 700;
    color: var(--primary-color);
}

.logo-icon {
    font-size: 26px;
}

.nav {
    display: flex;
    gap: 28px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 15px;
    transition: all 0.3s ease;
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-color);
    border-radius: 1px;
}

.login-btn {
    padding: 10px 24px;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.login-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.hero {
    background: var(--bg-gradient);
    padding: 70px 0;
}

.hero-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 40px;
}

.hero-text {
    flex: 1;
}

.hero-title {
    font-size: 44px;
    font-weight: 800;
    color: #fff;
    margin-bottom: 12px;
}

.hero-subtitle {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 12px;
}

.hero-desc {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 28px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
}

.primary-btn {
    display: inline-block;
    padding: 14px 32px;
    background: #fff;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 15px;
    font-weight: 600;
    border-radius: 25px;
    transition: all 0.3s ease;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}

.secondary-btn {
    display: inline-block;
    padding: 14px 32px;
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    text-decoration: none;
    font-size: 15px;
    font-weight: 600;
    border-radius: 25px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all 0.3s ease;
}

.secondary-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.hero-image {
    flex: 1;
}

.hero-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.features-overview {
    padding: 50px 0;
    background: var(--card-bg);
}

.section-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 32px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.feature-card {
    padding: 24px;
    text-align: center;
    background: #f8fafc;
    border-radius: 12px;
    transition: all 0.3s ease;
}

.feature-card:hover {
    background: var(--hover-bg);
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.feature-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.products-preview {
    padding: 50px 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.view-all {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 500;
    font-size: 14px;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.product-card {
    padding: 28px;
    background: var(--card-bg);
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    transition: all 0.3s ease;
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
}

.product-image {
    width: 80px;
    height: 80px;
    margin: 0 auto 16px;
    border-radius: 16px;
    overflow: hidden;
    background: var(--hover-bg);
}

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

.product-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.product-card p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.product-btn {
    display: inline-block;
    padding: 10px 24px;
    background: var(--primary-color);
    color: #fff;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    border-radius: 20px;
    transition: background 0.3s ease;
}

.product-btn:hover {
    background: var(--primary-dark);
}

.testimonials {
    padding: 50px 0;
    background: var(--card-bg);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.testimonial-card {
    padding: 24px;
    background: #f8fafc;
    border-radius: 12px;
    position: relative;
}

.testimonial-content {
    margin-bottom: 20px;
}

.testimonial-content p {
    font-size: 14px;
    color: var(--text-primary);
    font-style: italic;
    line-height: 1.8;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.author-avatar {
    font-size: 28px;
}

.author-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.author-title {
    font-size: 12px;
    color: var(--text-secondary);
}

.cta-section {
    padding: 50px 0;
    background: var(--bg-gradient);
    text-align: center;
}

.cta-content h2 {
    font-size: 28px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}

.cta-content p {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 28px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.page-header {
    background: var(--bg-gradient);
    padding: 50px 0;
    text-align: center;
}

.page-title {
    font-size: 32px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 10px;
}

.page-desc {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.85);
}

.products-section {
    padding: 50px 0;
}

.product-detail {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 24px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.product-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 24px;
}

.product-icon {
    font-size: 40px;
}

.product-info h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.product-info p {
    font-size: 14px;
    color: var(--text-secondary);
}

.product-features {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--hover-bg);
    border-radius: 20px;
}

.feature-item.disabled {
    opacity: 0.5;
}

.check-icon {
    color: #4CAF50;
    font-weight: 600;
}

.action-btn {
    display: inline-block;
    padding: 12px 32px;
    background: var(--primary-color);
    color: #fff;
    text-decoration: none;
    font-size: 15px;
    font-weight: 600;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.action-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.features-section {
    padding: 50px 0;
}

.feature-group {
    margin-bottom: 40px;
}

.group-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
    padding-left: 16px;
    border-left: 4px solid var(--primary-color);
}

.group-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.pricing-section {
    padding: 50px 0;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto 40px;
}

.pricing-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    position: relative;
    transition: all 0.3s ease;
}

.pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.pricing-card.popular {
    border: 2px solid var(--primary-color);
    transform: scale(1.02);
}

.popular-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 16px;
    background: var(--primary-color);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    border-radius: 12px;
}

.pricing-header h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.price {
    margin-bottom: 12px;
}

.currency {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary-color);
}

.amount {
    font-size: 48px;
    font-weight: 800;
    color: var(--primary-color);
}

.period {
    font-size: 16px;
    color: var(--text-secondary);
}

.pricing-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.pricing-features {
    text-align: left;
    margin-bottom: 24px;
}

.pricing-features .feature-item {
    background: transparent;
    border-radius: 0;
    padding: 10px 0;
}

.pricing-btn {
    padding: 14px 40px;
    background: var(--hover-bg);
    color: var(--primary-color);
    border: none;
    border-radius: 20px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.pricing-btn:hover {
    background: var(--primary-color);
    color: #fff;
}

.pricing-btn.primary {
    background: var(--primary-color);
    color: #fff;
}

.pricing-btn.primary:hover {
    background: var(--primary-dark);
}

.enterprise-section {
    text-align: center;
    padding: 40px;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.enterprise-section h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.enterprise-section p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

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

.contact-info {
    margin-bottom: 40px;
}

.contact-info h2,
.contact-form-section h2,
.faq-section h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.contact-methods {
    display: flex;
    gap: 20px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px;
    background: var(--card-bg);
    border-radius: 12px;
    flex: 1;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.contact-icon {
    font-size: 28px;
}

.contact-details h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.contact-details p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.contact-form-section {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    margin-bottom: 40px;
}

.contact-form {
    max-width: 800px;
}

.form-row {
    display: flex;
    gap: 20px;
    margin-bottom: 16px;
}

.form-row .form-group {
    flex: 1;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.submit-btn {
    padding: 14px 40px;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.submit-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.faq-section {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    padding: 20px;
    background: #f8fafc;
    border-radius: 8px;
}

.faq-question {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
}

.faq-icon {
    font-size: 18px;
}

.faq-question h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.faq-answer {
    padding-top: 12px;
}

.faq-answer p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer {
    background: var(--text-primary);
    padding: 35px 0;
    margin-top: 50px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
    font-weight: 700;
    color: #fff;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-link {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-link:hover {
    color: #fff;
}

.footer-copyright p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 768px) {
    .header-content {
        flex-wrap: wrap;
        gap: 12px;
    }
    
    .nav {
        gap: 16px;
    }
    
    .hero-content {
        flex-direction: column;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .group-features {
        grid-template-columns: 1fr;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-methods {
        flex-direction: column;
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}