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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

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

.header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: bold;
    color: #2563eb;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 8px;
    /* 未来替换logo时，可添加以下样式：
    background-image: url('your-logo.png');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    */
}

.logo img {
    height: 40px;
}

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

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-link:hover {
    color: #2563eb;
}

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 120px 0 80px;
    text-align: center;
    margin-top: 70px;
}

.hero h1 {
    font-size: 36px;
    max-width: 800px;
    margin: 0 auto;
}

.features {
    padding: 80px 0;
    background: #f9fafb;
}

.features .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-item {
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 15px;
}

.feature-item h3 {
    color: #2563eb;
    margin-bottom: 10px;
    font-size: 20px;
}

.feature-item p {
    color: #666;
    margin-bottom: 15px;
}

.feature-item ul {
    list-style: none;
    padding-left: 0;
}

.feature-item ul li {
    padding: 5px 0;
    color: #555;
    font-size: 14px;
}

.tools {
    padding: 80px 0;
}

.tools h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 32px;
    color: #1f2937;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}

.tool-item {
    text-align: center;
    padding: 20px;
}

.tool-icon {
    font-size: 40px;
    margin-bottom: 15px;
}

.tool-item h4 {
    margin-bottom: 10px;
    color: #1f2937;
}

.tool-item p {
    color: #666;
    font-size: 14px;
}

.amazon-service {
    padding: 80px 0;
    background: #f9fafb;
}

.amazon-service h2 {
    text-align: center;
    margin-bottom: 10px;
    font-size: 32px;
    color: #1f2937;
}

.amazon-service .subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 50px;
}

.amazon-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.amazon-feature {
    background: #fff;
    padding: 25px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.amazon-feature h4 {
    color: #2563eb;
    margin-bottom: 10px;
}

.amazon-feature p {
    color: #666;
    font-size: 14px;
}

.pain-points {
    padding: 80px 0;
}

.pain-points h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 32px;
    color: #1f2937;
}

.pain-points-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.pain-point {
    text-align: center;
    padding: 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border-radius: 10px;
}

.pain-point h4 {
    font-size: 24px;
    margin-bottom: 15px;
}

.footer {
    background: #1f2937;
    color: #fff;
    padding: 60px 0;
}

.contact-info h3 {
    margin-bottom: 20px;
    font-size: 24px;
}

.contact-info p {
    margin-bottom: 10px;
    color: #d1d5db;
}

/* Pricing Page Styles */
.pricing-section {
    padding: 80px 0;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.pricing-card {
    background: #fff;
    border-radius: 15px;
    padding: 40px 30px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    position: relative;
    transition: transform 0.3s, box-shadow 0.3s;
}

.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.pricing-card.featured {
    border: 3px solid #667eea;
    transform: scale(1.05);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-10px);
}

.popular-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 5px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: bold;
}

.pricing-header {
    text-align: center;
    margin-bottom: 30px;
}

.pricing-header h3 {
    font-size: 28px;
    color: #1f2937;
    margin-bottom: 15px;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 5px;
}

.price .amount {
    font-size: 48px;
    font-weight: bold;
    color: #667eea;
}

.price .period {
    font-size: 18px;
    color: #666;
}

.pricing-features {
    margin-bottom: 30px;
}

.pricing-features h4 {
    text-align: center;
    color: #666;
    margin-bottom: 20px;
    font-size: 16px;
}

.pricing-features ul {
    list-style: none;
    padding: 0;
}

.pricing-features ul li {
    padding: 10px 0;
    border-bottom: 1px solid #f0f0f0;
    color: #555;
}

.pricing-btn {
    display: block;
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 15px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
}

.pricing-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.pricing-note {
    background: #f9fafb;
    padding: 60px;
    border-radius: 15px;
    margin-bottom: 60px;
}

.pricing-note h3 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 28px;
    color: #1f2937;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}

.benefit-item {
    text-align: center;
}

.benefit-icon {
    font-size: 40px;
    margin-bottom: 15px;
}

.benefit-item h4 {
    margin-bottom: 10px;
    color: #1f2937;
}

.benefit-item p {
    color: #666;
    font-size: 14px;
}

.pricing-faq {
    max-width: 800px;
    margin: 0 auto;
}

.pricing-faq h3 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 28px;
    color: #1f2937;
}

.faq-item {
    background: #fff;
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 15px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.faq-item h4 {
    color: #1f2937;
    margin-bottom: 10px;
}

.faq-item p {
    color: #666;
    font-size: 14px;
}

/* Privacy Page Styles */
.privacy-section {
    padding: 80px 0;
    background: #f9fafb;
}

.privacy-content {
    max-width: 900px;
    margin: 0 auto;
    background: #fff;
    padding: 60px;
    border-radius: 15px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.privacy-block {
    margin-bottom: 40px;
}

.privacy-block h2 {
    color: #667eea;
    font-size: 24px;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #f0f0f0;
}

.privacy-block p {
    color: #555;
    margin-bottom: 15px;
    line-height: 1.8;
}

.privacy-block ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

.privacy-block ul li {
    color: #555;
    margin-bottom: 10px;
    line-height: 1.8;
}

.last-updated {
    text-align: center;
    padding: 20px;
    background: #f9fafb;
    border-radius: 10px;
    margin-top: 40px;
}

/* Active nav link */
.nav-link.active {
    color: #667eea;
    font-weight: 600;
}

@media (max-width: 768px) {
    .nav {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero h1 {
        font-size: 24px;
    }
    
    .header-content {
        flex-direction: column;
        gap: 15px;
    }
    
    .pricing-card.featured {
        transform: scale(1);
    }
    
    .pricing-card.featured:hover {
        transform: translateY(-10px);
    }
    
    .privacy-content {
        padding: 30px;
    }
    
    .pricing-note {
        padding: 30px;
    }
}