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

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

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

/* Header */
header {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo h1 {
    font-size: 24px;
    color: #1677FF;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 30px;
}

nav ul li a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

nav ul li a:hover,
nav ul li a.active {
    color: #1677FF;
}

.cart a {
    text-decoration: none;
    color: #1677FF;
    font-weight: 500;
    padding: 8px 15px;
    border: 2px solid #1677FF;
    border-radius: 4px;
    transition: all 0.3s;
}

.cart a:hover,
.cart a.active {
    background-color: #1677FF;
    color: #fff;
}

/* Main Content */
main {
    min-height: calc(100vh - 200px);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    text-align: center;
    padding: 100px 20px;
}

.hero h2 {
    font-size: 48px;
    margin-bottom: 20px;
}

.hero p {
    font-size: 20px;
    margin-bottom: 30px;
}

/* Features Section */
.features {
    background-color: #fff;
    padding: 60px 20px;
}

.features .container {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
}

.feature-item {
    text-align: center;
    flex: 1;
    min-width: 250px;
    margin: 20px;
}

.feature-item h3 {
    color: #1677FF;
    margin-bottom: 10px;
}

/* Hot Products */
.hot-products {
    padding: 60px 20px;
}

.hot-products h2 {
    text-align: center;
    margin-bottom: 40px;
    color: #333;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

.product-card {
    background-color: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.product-card img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.product-card h3 {
    padding: 15px 15px 5px;
    font-size: 18px;
    color: #333;
}

.product-card .description {
    padding: 0 15px 10px;
    color: #666;
    font-size: 14px;
}

.product-card .price {
    padding: 0 15px 15px;
    color: #ff4757;
    font-size: 20px;
    font-weight: bold;
}

.product-actions {
    padding: 0 15px 15px;
    display: flex;
    gap: 10px;
}

.product-actions .btn {
    flex: 1;
    text-align: center;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 500;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    opacity: 0.9;
}

.btn-primary {
    background-color: #1677FF;
    color: #fff;
}

.buy-btn {
    background-color: #ff4757;
    color: #fff;
}

.cart-btn {
    background-color: #ffa502;
    color: #fff;
}

.cancel-btn {
    background-color: #747d8c;
    color: #fff;
}

/* About Section */
.about {
    background-color: #fff;
    padding: 60px 20px;
    text-align: center;
}

.about h2 {
    margin-bottom: 20px;
    color: #333;
}

.about p {
    max-width: 800px;
    margin: 0 auto;
    color: #666;
}

/* Contact Section */
.contact {
    padding: 60px 20px;
    text-align: center;
    background-color: #f8f9fa;
}

.contact h2 {
    margin-bottom: 20px;
    color: #333;
}

.contact p {
    margin: 10px 0;
    color: #666;
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    text-align: center;
    padding: 60px 20px;
}

.page-header h1 {
    font-size: 36px;
    margin-bottom: 10px;
}

.page-header p {
    font-size: 18px;
}

/* Products Section */
.products-section {
    padding: 60px 20px;
}

/* Product Detail */
.product-detail {
    padding: 40px 20px;
}

.breadcrumb {
    margin-bottom: 30px;
    color: #666;
}

.breadcrumb a {
    color: #1677FF;
    text-decoration: none;
}

.product-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    background-color: #fff;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.product-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
}

.product-details h1 {
    font-size: 28px;
    margin-bottom: 15px;
    color: #333;
}

.product-details .price {
    font-size: 32px;
    color: #ff4757;
    font-weight: bold;
    margin-bottom: 20px;
}

.product-specs,
.product-description {
    margin-bottom: 20px;
}

.product-specs h3,
.product-description h3 {
    color: #333;
    margin-bottom: 10px;
}

.product-specs ul,
.product-description ul {
    list-style-position: inside;
    color: #666;
}

.product-specs li,
.product-description li {
    margin: 5px 0;
}

.product-actions {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.product-actions .btn {
    flex: 1;
    text-align: center;
}

/* Product Reviews */
.product-reviews {
    margin-top: 40px;
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.product-reviews h2 {
    margin-bottom: 20px;
    color: #333;
}

.review {
    border-bottom: 1px solid #eee;
    padding: 15px 0;
}

.review:last-child {
    border-bottom: none;
}

.review-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
}

.reviewer {
    font-weight: bold;
    color: #333;
}

.review-date {
    color: #999;
    font-size: 14px;
}

.review-content p {
    color: #666;
}

/* Payment Section */
.payment-section {
    padding: 40px 20px;
}

.payment-section h1 {
    text-align: center;
    margin-bottom: 40px;
    color: #333;
}

.payment-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

.order-info,
.payment-methods {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.order-info h2,
.payment-methods h2 {
    margin-bottom: 20px;
    color: #333;
}

.order-item {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
}

.order-item img {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: 4px;
}

.item-details h3 {
    color: #333;
    margin-bottom: 10px;
}

.item-details .price {
    color: #ff4757;
    font-weight: bold;
    font-size: 18px;
}

.order-summary {
    margin-top: 20px;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    color: #666;
}

.summary-item.total {
    font-size: 18px;
    font-weight: bold;
    color: #333;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 2px solid #eee;
}

.total-price {
    color: #ff4757;
    font-size: 24px;
}

.payment-option {
    margin-bottom: 15px;
    padding: 15px;
    border: 2px solid #eee;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.payment-option:hover {
    border-color: #1677FF;
}

.payment-option.selected {
    border-color: #1677FF;
    background-color: #f0f7ff;
}

.payment-option input[type="radio"] {
    display: none;
}

.payment-option label {
    display: flex;
    align-items: center;
    gap: 15px;
    cursor: pointer;
}

.payment-icon {
    display: flex;
    align-items: center;
}

.payment-actions {
    grid-column: 1 / -1;
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 20px;
}

.pay-btn {
    background-color: #1677FF;
    color: #fff;
    padding: 15px 40px;
    font-size: 16px;
}

.payment-tips {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.payment-tips h3 {
    color: #333;
    margin-bottom: 15px;
}

.payment-tips ul {
    list-style-position: inside;
    color: #666;
}

.payment-tips li {
    margin: 8px 0;
}

/* Success Section */
.success-section {
    padding: 80px 20px;
    text-align: center;
}

.success-message {
    background-color: #fff;
    padding: 60px 40px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    max-width: 600px;
    margin: 0 auto;
}

.success-icon {
    width: 80px;
    height: 80px;
    background-color: #52c41a;
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    margin: 0 auto 30px;
}

.success-message h1 {
    color: #52c41a;
    font-size: 36px;
    margin-bottom: 15px;
}

.success-message > p {
    color: #666;
    font-size: 18px;
    margin-bottom: 30px;
}

.order-info {
    background-color: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
}

.order-info p {
    margin: 10px 0;
    color: #666;
    font-size: 16px;
}

.order-info span {
    color: #333;
    font-weight: bold;
}

.success-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
}

.success-actions .btn {
    min-width: 150px;
}

/* Footer */
footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
}

footer p {
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 15px;
    }

    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }

    nav ul li {
        margin: 5px 15px;
    }

    .hero h2 {
        font-size: 32px;
    }

    .hero p {
        font-size: 16px;
    }

    .product-info {
        grid-template-columns: 1fr;
    }

    .payment-container {
        grid-template-columns: 1fr;
    }

    .features .container {
        flex-direction: column;
    }

    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}