/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 根变量定义 */
:root {
    --primary-blue: #1E40AF;
    --primary-cyan: #00D4FF;
    --secondary-blue: #3B82F6;
    --accent-purple: #8B5CF6;
    --accent-green: #10B981;
    --light-blue: #0EA5E9;
    --dark-blue: #1E293B;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --background-light: #F8FAFC;
    --background-dark: #FFFFFF;
    --white: #FFFFFF;
    --card-bg: #FFFFFF;
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-heavy: 0 10px 25px rgba(0, 0, 0, 0.15);
    --border-radius: 8px;
    --transition: all 0.3s ease;
    --glow-cyan: 0 0 10px rgba(0, 212, 255, 0.2);
    --glow-purple: 0 0 10px rgba(139, 92, 246, 0.2);
}

/* 基础样式 */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--background-light) 0%, var(--white) 100%);
    overflow-x: hidden;
    min-height: 100vh;
}

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

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 212, 255, 0.2);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-blue);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-menu a:hover {
    color: var(--primary-blue);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: var(--transition);
}

.nav-menu a:hover::after {
    width: 100%;
}

/* 英雄区域样式 */
.hero {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: var(--white);
    padding: 120px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="20" height="20" patternUnits="userSpaceOnUse"><path d="M 20 0 L 0 0 0 20" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.3"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.1;
    color: var(--white);
}

.hero-subtitle {
    font-size: 1.25rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 16px;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 32px;
    opacity: 0.9;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.9);
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
    margin-top: 32px;
}

.hero-feature {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    padding: 8px 16px;
    border-radius: var(--border-radius);
    color: var(--white);
    font-weight: 400;
    font-size: 0.9rem;
    opacity: 0.9;
}

.feature-icon {
    font-size: 1rem;
}

.cta-button {
    display: inline-block;
    background: var(--primary-cyan);
    color: var(--background-dark);
    padding: 16px 32px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
    box-shadow: var(--shadow-medium);
    border: none;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-heavy);
    background: #00B8E6;
}

/* 风险提示区域样式 */
.risk-disclosure {
    padding: 40px 0;
    background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
    border-top: 1px solid #F59E0B;
    border-bottom: 1px solid #F59E0B;
}

.risk-warning {
    background: rgba(255, 255, 255, 0.9);
    border: 2px solid #F59E0B;
    border-radius: var(--border-radius);
    padding: 24px;
    box-shadow: var(--shadow-medium);
    max-width: 800px;
    margin: 0 auto;
}

.risk-warning h3 {
    color: #D97706;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.risk-warning p {
    color: var(--text-primary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 12px;
}

.risk-warning p:last-child {
    margin-bottom: 0;
}

.risk-warning strong {
    color: #D97706;
    font-weight: 600;
}

/* 产品介绍区域样式 */
.product-section {
    padding: 80px 0;
    background: var(--white);
}

.product-section h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 20px;
}

.section-subtitle {
    text-align: center;
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 60px;
    font-weight: 500;
}

/* ROI高亮区域 */
.roi-highlight {
    margin-bottom: 80px;
}

.roi-card {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: var(--white);
    padding: 40px;
    border-radius: var(--border-radius);
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
    box-shadow: var(--shadow-heavy);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.roi-icon {
    margin-bottom: 24px;
}

.roi-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.roi-number {
    font-size: 4rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.roi-card p {
    font-size: 1.1rem;
    opacity: 0.9;
    line-height: 1.6;
}

.features-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 40px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
    margin-top: 40px;
}

.feature-card {
    background: var(--white);
    padding: 32px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    border: 1px solid rgba(59, 130, 246, 0.1);
    color: var(--text-primary);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-heavy);
    border-color: var(--primary-blue);
}

.feature-icon {
    margin-bottom: 24px;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 16px;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.feature-benefit {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
}

.benefit-tag {
    background: var(--primary-blue);
    color: var(--white);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.benefit-text {
    color: var(--primary-blue);
    font-weight: 500;
    font-size: 0.9rem;
}

/* 对比区域样式 */
.comparison-section {
    margin-top: 80px;
    padding: 60px 0;
    background: var(--background-light);
    border-radius: var(--border-radius);
}

.comparison-section h3 {
    text-align: center;
    font-size: 2rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 40px;
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    max-width: 900px;
    margin: 0 auto;
}

.comparison-card {
    background: var(--white);
    padding: 32px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    border: 2px solid transparent;
    transition: var(--transition);
}

.comparison-card.before {
    border-color: #EF4444;
}

.comparison-card.after {
    border-color: var(--primary-blue);
    transform: scale(1.02);
}

.comparison-card h4 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 24px;
    text-align: center;
}

.comparison-card.before h4 {
    color: #EF4444;
}

.comparison-card.after h4 {
    color: var(--primary-blue);
}

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

.comparison-card li {
    padding: 12px 0;
    border-bottom: 1px solid rgba(59, 130, 246, 0.1);
    position: relative;
    padding-left: 24px;
    color: var(--text-primary);
}

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

.comparison-card.before li::before {
    content: '✗';
    position: absolute;
    left: 0;
    color: #EF4444;
    font-weight: bold;
}

.comparison-card.after li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: bold;
}

/* 用户案例区域样式 */
.cases-section {
    padding: 80px 0;
    background: var(--background-light);
}

.cases-section h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 60px;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.case-card {
    background: var(--white);
    padding: 32px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(59, 130, 246, 0.1);
    color: var(--text-primary);
}

.case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-heavy);
}

.case-avatar {
    margin-bottom: 24px;
}

.case-card blockquote {
    font-size: 1.1rem;
    font-style: italic;
    color: var(--text-primary);
    margin-bottom: 24px;
    line-height: 1.6;
    position: relative;
}

.case-card blockquote::before {
    content: '"';
    font-size: 3rem;
    color: var(--primary-blue);
    position: absolute;
    top: -10px;
    left: -10px;
    font-family: serif;
}

.case-author {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.case-author strong {
    color: var(--primary-blue);
    font-weight: 600;
}

.case-author span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.roi-result {
    background: var(--primary-blue);
    color: var(--white);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-top: 8px;
    display: inline-block;
}

/* 支付订阅区域样式 */
.payment-section {
    padding: 80px 0;
    background: var(--white);
}

.payment-section h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 20px;
}

.payment-section .section-subtitle {
    text-align: center;
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-weight: 500;
}

.value-proposition {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.value-item {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--white);
    padding: 16px 24px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    border: 1px solid rgba(59, 130, 246, 0.2);
    color: var(--text-primary);
}

.value-icon {
    font-size: 1.5rem;
}

.value-text {
    font-weight: 600;
    color: var(--primary-blue);
    font-size: 1rem;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
    max-width: 800px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 40px;
    box-shadow: var(--shadow-light);
    border: 2px solid rgba(59, 130, 246, 0.1);
    transition: var(--transition);
    position: relative;
    color: var(--text-primary);
}

.pricing-card.featured {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-heavy);
    transform: scale(1.05);
}

.pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-heavy);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-4px);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-blue);
    color: var(--white);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.pricing-header {
    text-align: center;
    margin-bottom: 32px;
}

.pricing-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 16px;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.currency {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-blue);
}

.amount {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-blue);
}

.period {
    font-size: 1rem;
    color: var(--text-secondary);
}

.pricing-features {
    list-style: none;
    margin-bottom: 32px;
}

.pricing-features li {
    padding: 12px 0;
    border-bottom: 1px solid rgba(30, 58, 138, 0.1);
    color: var(--text-primary);
    position: relative;
    padding-left: 24px;
}

.pricing-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: bold;
}

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

.paypal-form {
    width: 100%;
}

.paypal-button {
    width: 100%;
    background: #0070BA;
    color: var(--white);
    border: none;
    padding: 16px 24px;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.paypal-button:hover {
    background: #005EA6;
    transform: translateY(-2px);
}

.paypal-button.featured {
    background: var(--primary-blue);
    color: var(--white);
}

.paypal-button.featured:hover {
    background: #1E40AF;
}

.email-notice {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 16px;
    padding: 12px 16px;
    background: rgba(59, 130, 246, 0.05);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--border-radius);
    color: var(--primary-blue);
    font-size: 0.875rem;
    font-weight: 500;
}

.email-icon {
    font-size: 1rem;
}

/* 页脚样式 */
.footer {
    background: var(--primary-blue);
    color: var(--white);
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 1.1rem;
}

.footer p {
    opacity: 0.8;
    font-size: 0.9rem;
}

.footer-risk-disclosure {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 20px;
    padding-top: 20px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .risk-warning {
        margin: 0 20px;
        padding: 20px;
    }
    
    .risk-warning h3 {
        font-size: 1.1rem;
    }
    
    .risk-warning p {
        font-size: 0.9rem;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .product-section h2,
    .cases-section h2,
    .payment-section h2 {
        font-size: 2rem;
    }
    
    .roi-number {
        font-size: 3rem;
    }
    
    .value-proposition {
        flex-direction: column;
        gap: 20px;
    }
    
    .value-item {
        justify-content: center;
    }
    
    .hero-features {
        flex-direction: column;
        gap: 16px;
    }
    
    .hero-feature {
        justify-content: center;
        text-align: center;
    }
    
    .email-notice {
        text-align: center;
        flex-direction: column;
        gap: 4px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .cases-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .pricing-card.featured:hover {
        transform: translateY(-4px);
    }
    
    .container {
        padding: 0 16px;
    }
    
    .feature-card,
    .case-card,
    .pricing-card {
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .cta-button {
        padding: 14px 24px;
        font-size: 1rem;
    }
    
    .product-section,
    .cases-section,
    .payment-section {
        padding: 60px 0;
    }
    
    .product-section h2,
    .cases-section h2,
    .payment-section h2 {
        font-size: 1.75rem;
        margin-bottom: 40px;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 焦点样式 */
button:focus,
a:focus {
    outline: 2px solid var(--primary-gold);
    outline-offset: 2px;
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}



.feature-card,
.case-card,
.pricing-card {
    animation: fadeInUp 0.6s ease-out;
}

/* 悬停效果增强 */
.feature-card:hover .feature-icon svg {
    transform: scale(1.1);
    transition: var(--transition);
}

.case-card:hover .case-avatar svg {
    transform: scale(1.05);
    transition: var(--transition);
}

/* SEO内容区域样式 */
.seo-content {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    padding: 80px 0;
}

.seo-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    margin-bottom: 60px;
}

.seo-card {
    background: white;
    padding: 32px;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(30, 64, 175, 0.1);
    transition: var(--transition);
}

.seo-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.seo-card h3 {
    color: var(--primary-blue);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 20px;
    line-height: 1.3;
}

.seo-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.seo-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.seo-card li {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 12px;
    padding-left: 24px;
    position: relative;
}

.seo-card li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: bold;
    font-size: 1.1rem;
}

.seo-card li strong {
    color: var(--text-primary);
    font-weight: 600;
}

.seo-cta {
    text-align: center;
    background: white;
    padding: 48px;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    border: 2px solid var(--primary-blue);
}

.seo-cta h3 {
    color: var(--primary-blue);
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 20px;
    line-height: 1.3;
}

.seo-cta p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.seo-cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-blue) 0%, #1e40af 100%);
    color: white;
    padding: 16px 32px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(30, 64, 175, 0.3);
}

.seo-cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(30, 64, 175, 0.4);
    background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
}

/* SEO内容区域响应式设计 */
@media (max-width: 768px) {
    .seo-content {
        padding: 60px 0;
    }
    
    .seo-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .seo-card {
        padding: 24px;
    }
    
    .seo-card h3 {
        font-size: 1.3rem;
    }
    
    .seo-cta {
        padding: 32px 24px;
    }
    
    .seo-cta h3 {
        font-size: 1.5rem;
    }
    
    .seo-cta p {
        font-size: 1rem;
    }
    
    .seo-cta-button {
        padding: 14px 24px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .seo-content {
        padding: 40px 0;
    }
    
    .seo-card {
        padding: 20px;
    }
    
    .seo-card h3 {
        font-size: 1.2rem;
    }
    
    .seo-cta {
        padding: 24px 16px;
    }
    
    .seo-cta h3 {
        font-size: 1.3rem;
    }
}