/* ===== Global Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #667eea;
    --primary-dark: #5a67d8;
    --secondary: #764ba2;
    --accent: #f093fb;
    --success: #48bb78;
    --warning: #ed8936;
    --danger: #f56565;
    --text: #1a202c;
    --text-light: #718096;
    --bg: #f7fafc;
    --white: #ffffff;
    --border: #e2e8f0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
}

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

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-dark);
}

.gradient-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: var(--gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
    color: white;
}

.btn-secondary {
    background: var(--white);
    color: var(--text);
    border: 2px solid var(--border);
}

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

.btn-lg {
    padding: 16px 32px;
    font-size: 16px;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 12px;
}

.btn-block {
    width: 100%;
}

.btn-arrow {
    transition: transform 0.2s;
}

.btn:hover .btn-arrow {
    transform: translateX(4px);
}

/* ===== Header ===== */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 800;
    color: var(--text);
}

.logo:hover {
    color: var(--text);
}

.logo-icon {
    font-size: 32px;
}

.nav {
    display: flex;
    gap: 35px;
}

.nav a {
    color: var(--text-light);
    font-weight: 500;
    font-size: 15px;
    position: relative;
}

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

.nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient);
    transition: width 0.3s;
}

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

.cart-btn {
    background: var(--gradient);
    color: white !important;
    padding: 10px 20px;
    border-radius: 25px;
    font-weight: 600;
}

.cart-btn:hover {
    transform: scale(1.05);
    color: white !important;
}

/* ===== Hero Section ===== */
.hero {
    background: var(--gradient);
    color: white;
    padding: 80px 0 100px;
    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,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 8px 20px;
    border-radius: 25px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 25px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 52px;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 18px;
    opacity: 0.9;
    max-width: 650px;
    margin: 0 auto 30px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-bottom: 30px;
}

.hero-buttons .btn-primary {
    background: white;
    color: var(--primary);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.hero-buttons .btn-primary:hover {
    background: white;
    color: var(--primary-dark);
}

.hero-buttons .btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.hero-buttons .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
    color: white;
}

.hero-trust {
    display: flex;
    gap: 30px;
    justify-content: center;
    font-size: 14px;
    opacity: 0.9;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 60px;
    position: relative;
    z-index: 1;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 800;
}

.stat-label {
    opacity: 0.8;
    font-size: 14px;
}

/* ===== Trust Section ===== */
.trust-section {
    background: var(--white);
    padding: 30px 0;
    border-bottom: 1px solid var(--border);
}

.trust-badges {
    display: flex;
    justify-content: center;
    gap: 50px;
    flex-wrap: wrap;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-light);
    font-size: 14px;
    font-weight: 500;
}

.trust-item img {
    width: 32px;
    height: 32px;
}

/* ===== Section Styles ===== */
.section-badge {
    display: inline-block;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    color: var(--primary);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 15px;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header h2 {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 15px;
    color: var(--text);
}

.section-header p {
    color: var(--text-light);
    font-size: 18px;
}

/* ===== Products Section ===== */
.products {
    padding: 100px 0;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
}

.product-card {
    background: var(--white);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.4s ease;
    border: 1px solid var(--border);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.product-image {
    height: 200px;
    background: var(--gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 70px;
    position: relative;
    overflow: hidden;
}

.product-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(102, 126, 234, 0.2), rgba(118, 75, 162, 0.2));
}

.product-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background: white;
    color: var(--primary);
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: 700;
    z-index: 1;
}

.product-content {
    padding: 25px;
}

.product-category {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 12px;
}

.product-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text);
}

.product-description {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 15px;
    line-height: 1.6;
}

.product-features {
    margin-bottom: 15px;
}

.product-features li {
    color: var(--text-light);
    font-size: 13px;
    margin-bottom: 5px;
    padding-left: 20px;
    position: relative;
}

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

.product-price {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.price-current {
    font-size: 28px;
    font-weight: 800;
    color: var(--primary);
}

.price-original {
    font-size: 16px;
    color: var(--text-light);
    text-decoration: line-through;
}

.product-actions {
    display: flex;
    gap: 10px;
}

.product-actions .btn {
    flex: 1;
}

/* ===== Features Section ===== */
.features {
    padding: 100px 0;
    background: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
}

.feature-card {
    text-align: center;
    padding: 40px 30px;
    border-radius: 20px;
    background: var(--bg);
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.feature-card:hover {
    background: var(--white);
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 50px;
    margin-bottom: 20px;
    display: block;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

.feature-card p {
    color: var(--text-light);
    font-size: 15px;
    line-height: 1.6;
}

/* ===== Testimonials Section ===== */
.testimonials {
    padding: 100px 0;
    background: var(--bg);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.testimonial-card {
    background: var(--white);
    padding: 35px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

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

.testimonial-rating {
    font-size: 18px;
    margin-bottom: 20px;
}

.testimonial-text {
    font-size: 16px;
    line-height: 1.7;
    color: var(--text);
    margin-bottom: 25px;
    font-style: italic;
}

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

.author-avatar {
    width: 50px;
    height: 50px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.author-info {
    display: flex;
    flex-direction: column;
}

.author-name {
    font-weight: 700;
    color: var(--text);
}

.author-title {
    font-size: 13px;
    color: var(--text-light);
}

/* ===== FAQ Section ===== */
.faq {
    padding: 100px 0;
}

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

.faq-item {
    margin-bottom: 15px;
    border-radius: 12px;
    overflow: hidden;
    background: var(--white);
    box-shadow: var(--shadow);
}

.faq-question {
    width: 100%;
    padding: 22px 25px;
    background: var(--white);
    border: none;
    text-align: left;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s;
    color: var(--text);
}

.faq-question:hover {
    background: var(--bg);
}

.faq-icon {
    font-size: 20px;
    color: var(--primary);
    transition: transform 0.3s;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-answer.open {
    max-height: 200px;
    padding: 0 25px 20px;
}

.faq-answer p {
    color: var(--text-light);
    font-size: 15px;
    line-height: 1.7;
}

/* ===== CTA Section ===== */
.cta-section {
    background: var(--gradient);
    padding: 80px 0;
    text-align: center;
}

.cta-content h2 {
    font-size: 40px;
    font-weight: 800;
    color: white;
    margin-bottom: 15px;
}

.cta-content p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 30px;
}

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

.cta-section .btn-primary:hover {
    background: white;
    color: var(--primary-dark);
}

/* ===== Footer ===== */
.footer {
    background: var(--text);
    color: white;
    padding: 80px 0 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 80px;
    margin-bottom: 50px;
}

.footer-brand .logo {
    color: white;
    margin-bottom: 20px;
}

.footer-brand p {
    opacity: 0.7;
    line-height: 1.7;
    margin-bottom: 25px;
}

.footer-social {
    display: flex;
    gap: 15px;
}

.social-link {
    background: rgba(255, 255, 255, 0.1);
    padding: 10px 20px;
    border-radius: 8px;
    color: white !important;
    font-size: 14px;
    transition: all 0.3s;
}

.social-link:hover {
    background: var(--primary);
    color: white !important;
}

.footer-links {
    display: flex;
    gap: 60px;
}

.footer-column h4 {
    margin-bottom: 20px;
    font-weight: 600;
}

.footer-column a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 12px;
    transition: all 0.2s;
}

.footer-column a:hover {
    color: white;
    opacity: 1;
}

.footer-bottom {
    text-align: center;
    opacity: 0.7;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-payment {
    margin-top: 10px;
}

/* ===== Checkout Page ===== */
.checkout-page {
    padding: 60px 0;
    min-height: 80vh;
}

.checkout-page h1 {
    margin-bottom: 30px;
    font-size: 32px;
}

.checkout-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.order-summary, .payment-form {
    background: var(--white);
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.order-item {
    display: flex;
    justify-content: space-between;
    padding: 15px 0;
    border-bottom: 1px solid var(--border);
}

.order-total {
    display: flex;
    justify-content: space-between;
    padding: 20px 0;
    font-size: 20px;
    font-weight: 700;
}

.form-group {
    margin-bottom: 20px;
}

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

.form-group input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 15px;
    transition: all 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group small {
    color: var(--text-light);
    font-size: 12px;
}

.payment-methods {
    margin-top: 30px;
}

.payment-note {
    color: var(--text-light);
    font-size: 14px;
    margin: 10px 0 20px;
}

.security-badges {
    display: flex;
    gap: 20px;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    font-size: 12px;
    color: var(--text-light);
}

/* ===== Notifications ===== */
.notification {
    position: fixed;
    top: 100px;
    right: 20px;
    padding: 15px 25px;
    border-radius: 10px;
    color: white;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { transform: translateX(100px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* ===== Responsive ===== */
@media (max-width: 968px) {
    .hero h1 {
        font-size: 36px;
    }
    
    .hero-stats {
        gap: 30px;
    }
    
    .stat-number {
        font-size: 28px;
    }
    
    .checkout-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-links {
        flex-wrap: wrap;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .hero {
        padding: 60px 0 80px;
    }
    
    .hero h1 {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: 20px;
    }
    
    .trust-badges {
        gap: 25px;
    }
    
    .section-header h2 {
        font-size: 28px;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
}

/* 语言切换按钮 */
.lang-btn {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    margin-right: 15px;
    transition: all 0.3s;
}
.lang-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}