/* 自定义样式表 */
:root {
    --primary-color: #0056b3;
    --secondary-color: #6c757d;
    --accent-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
}

body {
    font-family: 'Microsoft YaHei', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

header {
    background: linear-gradient(135deg, var(--primary-color), #003366);
    padding: 2rem 0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-weight: 700;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.navbar {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.navbar-nav .nav-link {
    font-weight: 500;
    padding: 0.8rem 1rem;
    transition: all 0.3s ease;
}

.navbar-nav .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

main {
    min-height: 70vh;
}

h2, h3, h4 {
    color: var(--primary-color);
    margin-bottom: 1.2rem;
}

.lead {
    font-size: 1.25rem;
    font-weight: 300;
    line-height: 1.7;
}

.card {
    border: none;
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.card-header {
    border-radius: 0.5rem 0.5rem 0 0 !important;
}

.btn {
    border-radius: 0.3rem;
    padding: 0.5rem 1.5rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

footer {
    background: linear-gradient(135deg, var(--dark-color), #1a1a1a);
    padding: 2rem 0;
    margin-top: 3rem;
}

/* 表格样式 */
.table-responsive {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border-radius: 0.5rem;
    overflow: hidden;
}

.table {
    margin-bottom: 0;
}

.table thead th {
    background-color: var(--primary-color);
    color: white;
    border: none;
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(0, 0, 0, 0.02);
}

/* 响应式调整 */
@media (max-width: 768px) {
    header {
        padding: 1.5rem 0;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    .lead {
        font-size: 1.1rem;
    }
}

/* 图表容器 */
.chart-container {
    background-color: white;
    border-radius: 0.5rem;
    padding: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

/* 厂商卡片 */
.manufacturer-card {
    margin-bottom: 2rem;
}

.manufacturer-card .card-header {
    font-weight: 600;
}

.manufacturer-card .card-body {
    padding: 1.5rem;
}

/* 产品列表 */
.product-list {
    list-style-type: none;
    padding-left: 0;
}

.product-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #eee;
}

.product-list li:last-child {
    border-bottom: none;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    line-height: 40px;
    z-index: 1000;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.back-to-top:hover {
    opacity: 1;
}