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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Microsoft YaHei', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.8;
    color: #2c3e50;
    background: #f8f9fa;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: #3498db;
    text-decoration: none;
    transition: all 0.3s ease;
}

a:hover {
    color: #2980b9;
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

ul {
    list-style: none;
}

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

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -15px;
}

.col-4, .col-8, .col-12 {
    padding: 0 15px;
}

.col-4 { width: 33.333%; }
.col-8 { width: 66.667%; }
.col-12 { width: 100%; }

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #2980b9, #2471a3);
}

.btn-secondary {
    background: linear-gradient(135deg, #6c757d, #5a6268);
    color: white;
}

.btn-secondary:hover {
    background: linear-gradient(135deg, #5a6268, #495057);
}

.btn-danger {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
}

.btn-danger:hover {
    background: linear-gradient(135deg, #c0392b, #a93226);
}

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
}

.btn-small {
    padding: 8px 16px;
    font-size: 14px;
}

.btn-block {
    display: flex;
    width: 100%;
}

/* 表单 */
.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
    color: #495057;
    font-size: 15px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #e1e5e9;
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: white;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
    background: white;
}

/* 网站头部 */
.site-header {
    background: white;
    box-shadow: 0 2px 20px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
}

.logo a {
    display: flex;
    align-items: center;
    font-size: 28px;
    font-weight: 700;
    color: #3498db;
    letter-spacing: -0.5px;
}

.logo img {
    height: 48px;
    margin-right: 12px;
    border-radius: 50%;
}

.main-nav {
    display: flex;
    gap: 40px;
}

.nav-item {
    padding: 10px 0;
    font-weight: 500;
    color: #2c3e50;
    position: relative;
    font-size: 16px;
}

.nav-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #3498db;
    transition: width 0.3s ease;
}

.nav-item.active::after,
.nav-item:hover::after {
    width: 100%;
}

.nav-item.active,
.nav-item:hover {
    color: #3498db;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.search-form {
    display: flex;
    align-items: center;
}

.search-input {
    padding: 8px 15px;
    border: 1px solid #ddd;
    border-radius: 20px;
    width: 200px;
}

.search-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
}

/* Banner */
.site-banner {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 100px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.site-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"><path d="M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z" fill="%23ffffff" fill-opacity="0.1" fill-rule="evenodd"/></svg>');
    opacity: 0.3;
}

.banner-title {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: -1px;
    position: relative;
    z-index: 1;
}

.banner-desc {
    font-size: 20px;
    opacity: 0.95;
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    position: relative;
    z-index: 1;
}

.banner-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
    position: relative;
    z-index: 1;
    flex-wrap: wrap;
}

/* 网站主体 */
.site-main {
    padding: 40px 0;
    min-height: 500px;
}

.section {
    margin-bottom: 60px;
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
}

.section-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #2c3e50;
}

.section-title .icon {
    margin-right: 10px;
    font-size: 24px;
}

.more {
    font-size: 15px;
    color: #6c757d;
    font-weight: 500;
}

.more:hover {
    color: #3498db;
    transform: translateX(3px);
}

/* 网站卡片 */
.website-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

.website-card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    border: 1px solid #f0f2f5;
}

.website-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.12);
    border-color: #e1e8ed;
}

.website-logo {
    width: 70px;
    height: 70px;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 4px;
}

.website-logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 8px;
    background: white;
}

.website-title {
    font-size: 18px;
    margin-bottom: 12px;
    line-height: 1.4;
}

.website-title a {
    font-weight: 600;
    color: #2c3e50;
}

.website-title a:hover {
    color: #3498db;
}

.website-desc {
    color: #6c757d;
    font-size: 14px;
    margin-bottom: 16px;
    height: 48px;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.website-meta {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    color: #9ca3af;
    padding-top: 12px;
    border-top: 1px solid #f0f2f5;
}

/* 产品卡片 */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 25px;
}

.product-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    border: 1px solid #f0f2f5;
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.12);
    border-color: #e1e8ed;
}

.product-img {
    height: 220px;
    overflow: hidden;
    position: relative;
    background: #f8f9fa;
}

.product-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 0;
    transition: transform 0.3s ease;
}

.product-card:hover .product-img img {
    transform: scale(1.05);
}

.product-title {
    padding: 20px;
    font-size: 16px;
    font-weight: 500;
    flex: 1;
}

.product-title a {
    color: #2c3e50;
}

.product-title a:hover {
    color: #3498db;
}

.product-price {
    padding: 0 20px 20px;
    font-size: 20px;
    color: #e74c3c;
    font-weight: 700;
}

.product-meta {
    padding: 0 20px 20px;
    font-size: 13px;
    color: #9ca3af;
    display: flex;
    gap: 15px;
}

/* 页脚 */
.site-footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 80px 0 30px;
    margin-top: 80px;
    position: relative;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3498db, #e74c3c, #f39c12, #2ecc71);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 50px;
}

.footer-section h3 {
    font-size: 20px;
    margin-bottom: 25px;
    font-weight: 600;
    color: #ecf0f1;
    position: relative;
    padding-bottom: 10px;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: #3498db;
}

.footer-section p {
    color: #bdc3c7;
    font-size: 15px;
    line-height: 1.7;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: #bdc3c7;
    font-size: 15px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
}

.footer-links a:hover {
    color: white;
    transform: translateX(5px);
}

.footer-contact li {
    margin-bottom: 12px;
    color: #bdc3c7;
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-contact .icon {
    color: #3498db;
    font-size: 18px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #95a5a6;
    font-size: 14px;
}

/* 返回顶部 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
    cursor: pointer;
    border: none;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
    background: linear-gradient(135deg, #2980b9, #2471a3);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

/* 响应式 */
@media (max-width: 992px) {
    .website-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 20px;
    }
    
    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 20px;
    }
    
    .section {
        padding: 20px;
    }
}

@media (max-width: 768px) {
    .col-4, .col-8 {
        width: 100%;
    }
    
    .header-inner {
        flex-wrap: wrap;
        gap: 15px;
    }
    
    .main-nav {
        order: 3;
        width: 100%;
        flex-wrap: wrap;
        gap: 20px;
        margin-top: 10px;
        padding-top: 15px;
        border-top: 1px solid #f0f2f5;
    }
    
    .nav-item {
        padding: 8px 0;
        font-size: 15px;
    }
    
    .banner-title {
        font-size: 40px;
    }
    
    .banner-desc {
        font-size: 18px;
    }
    
    .banner-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .website-grid {
        grid-template-columns: 1fr;
    }
    
    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 15px;
    }
    
    .product-img {
        height: 180px;
    }
    
    .footer-content {
        gap: 30px;
    }
    
    .section-title {
        font-size: 24px;
    }
}

@media (max-width: 480px) {
    .banner-title {
        font-size: 32px;
    }
    
    .banner-desc {
        font-size: 16px;
    }
    
    .btn-large {
        padding: 14px 28px;
        font-size: 16px;
    }
    
    .website-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section {
        padding: 15px;
        margin-bottom: 40px;
    }
}