/* 基本样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
}

:root {
    --primary-color: #0071e3;
    --sidebar-bg: #f5f5f7;
    --sidebar-active: #e5e5ea;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

body {
    background-color: #ffffff;
    color: var(--text-primary);
}

.container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* 顶部Banner样式 */
.top-banner {
    display: flex;
    background: linear-gradient(135deg, #f5f5f7 0%, #e5e5ea 100%);
    height: 120px;
    width: 100%;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.logo-area {
    width: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 20px;
    border-right: 1px solid rgba(0, 0, 0, 0.05);
}

.logo {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
}

.banner-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0 40px;
}

.banner-content h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-primary);
}

.banner-content p {
    font-size: 17px;
    color: var(--text-secondary);
}

/* 主要内容区域 */
.main-content {
    display: flex;
    flex: 1;
}

/* 侧边栏样式 */
.sidebar {
    width: 220px;
    background-color: var(--sidebar-bg);
    padding: 20px 0;
}

.nav-menu {
    list-style: none;
}

.nav-item {
    margin-bottom: 2px;
}

.nav-item a {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
    border-radius: 8px;
    margin: 0 8px;
}

.nav-item a i {
    margin-right: 12px;
    font-size: 18px;
    width: 24px;
    text-align: center;
    color: var(--primary-color);
}

.nav-item a:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.nav-item.active a {
    background-color: var(--sidebar-active);
    font-weight: 500;
}

/* 内容区域样式 */
.content {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

.supplier-cards h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.card-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

/* 卡片样式 */
.card {
    background-color: #fff;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.08);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.card-header {
    height: 160px;
    overflow: hidden;
    background-color: #f5f5f7;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-header img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-body {
    padding: 20px;
}

.card-body h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
}

.card-body p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    margin-top: 12px;
}

.tag {
    display: inline-block;
    padding: 4px 10px;
    margin-right: 8px;
    margin-bottom: 8px;
    background-color: #f5f5f7;
    border-radius: 20px;
    font-size: 12px;
    color: var(--text-primary);
}

.card-footer {
    display: flex;
    padding: 15px 20px;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.btn {
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    margin-right: 10px;
    color: var(--text-primary);
    background-color: #f5f5f7;
}

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

.btn:hover {
    opacity: 0.9;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        padding: 10px 0;
    }
    
    .top-banner {
        flex-direction: column;
        height: auto;
    }
    
    .logo-area {
        width: 100%;
        height: 70px;
        border-right: none;
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }
    
    .card-container {
        grid-template-columns: 1fr;
    }
}