/* 全局基础样式（复用+优化） */
:root {
    --primary-color: #f8c630;
    --text-dark: #1a365d;
    --text-gray: #666;
    --success-color: #27ae60;
    --bg-light: #f9f9f9;
    --border-color: #ddd;
    --gap-sm: 10px;
    --gap-md: 20px;
    --gap-lg: 30px;
    --card-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

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

body {
    font-family: "PingFang SC", "Microsoft Yahei", sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
}

.container {
    max-width: 2000px;
    margin: 0 auto;
    padding: 0 var(--gap-md);
}

/* 占位导航栏/页脚 */
.placeholder-nav, .placeholder-footer {
    background: var(--text-dark);
    color: white;
    padding: var(--gap-md);
    text-align: center;
}
.placeholder-nav {
    margin-bottom: var(--gap-lg);
}
.placeholder-footer {
    margin-top: var(--gap-lg);
}

/* 按钮通用样式 */
.cta-button {
    background: var(--primary-color);
    color: var(--text-dark);
    border: none;
    border-radius: 4px;
    padding: 12px 24px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: background 0.3s;
    display: inline-block;
    text-decoration: none;
    text-align: center;
}

.cta-button:hover {
    background: #e9b510;
}

.cta-button:active {
    background: #d8a400;
}

/* 筛选区域样式（默认隐藏，仅显示展开按钮） */
.filter-section {
    background-color: var(--bg-light);
    padding: var(--gap-lg) 0;
    margin-bottom: var(--gap-lg);
}

.filter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--gap-md);
}

.filter-title {
    margin: auto;
    font-size: 20px;
    font-weight: 600;
}

/* 筛选折叠按钮（默认显示） */
.filter-toggle {
    background: var(--primary-color);
    color: var(--text-dark);
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    display: block;
    margin: 0 auto;
}

/* 筛选选项 */
.filter-options-wrap {
    display: block;
    margin-top: var(--gap-md);
}

.filter-options {
    display: flex;
    gap: var(--gap-md);
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
}

.filter-options select,
.filter-options input {
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    flex: 1;
    min-width: 180px;
    font-size: 14px;
    max-width: 300px;
}

/* 搜索按钮 */
.search-btn {
    background: var(--primary-color);
    color: var(--text-dark);
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    min-width: 120px;
}

/* 筛选状态标签 */
.filter-tags {
    display: flex;
    gap: var(--gap-sm);
    flex-wrap: wrap;
    margin-top: var(--gap-md);
    justify-content: center;
}

.filter-tag {
    background: #e8f4f8;
    color: var(--text-dark);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.filter-tag-close {
    cursor: pointer;
    font-size: 16px;
    color: #999;
}

.filter-tag-close:hover {
    color: #e74c3c;
}

.clear-filter {
    color: var(--text-dark);
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 14px;
    text-decoration: underline;
    margin-left: var(--gap-sm);
}

/* 车辆列表样式（固定5列，响应式适配） */
.cars-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--gap-lg);
    margin-top: var(--gap-lg);
}
/* 响应式适配：屏幕宽度不足时自动调整列数 */
@media (max-width: 1200px) {
    .cars-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}
@media (max-width: 992px) {
    .cars-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}
@media (max-width: 768px) {
    .cars-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (max-width: 576px) {
    .cars-grid {
        grid-template-columns: 1fr;
    }
}

.car-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.car-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.car-img-container {
    width: 100%;
    height: 200px;
    overflow: hidden;
    position: relative;
}

.car-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

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

/* 加载中占位图 */
.img-skeleton {
    width: 100%;
    height: 200px;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.car-info {
    padding: var(--gap-md);
}

.car-name {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.car-spec {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 12px;
    line-height: 1.5;
}

.price-tag {
    font-size: 24px;
    color: #e74c3c;
    font-weight: bold;
    margin: 10px 0;
}

.certification {
    display: flex;
    gap: var(--gap-sm);
    margin-bottom: var(--gap-md);
    flex-wrap: wrap;
}

.certification-tag {
    font-size: 14px;
    color: var(--success-color);
    background-color: #f1f9f7;
    padding: 3px 10px;
    border-radius: 12px;
}

/* 查看详情按钮 */
.detail-btn {
    display: block;
    width: 100%;
    background: var(--primary-color);
    color: var(--text-dark);
    text-align: center;
    padding: 10px 0;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    transition: background 0.3s;
}
.detail-btn:hover {
    background: #e9b510;
}

/* 空数据/加载状态样式 */
.empty-state, .loading-state, .error-state {
    text-align: center;
    padding: var(--gap-lg) 0;
    color: var(--text-gray);
    grid-column: 1 / -1;
}

.empty-icon, .error-icon {
    font-size: 48px;
    margin-bottom: var(--gap-md);
    color: #ccc;
}

.empty-state h3, .loading-state h3, .error-state h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.empty-state p, .error-state p {
    margin-bottom: var(--gap-md);
}

/* 展示更多按钮 */
.load-more-wrap {
    text-align: center;
    margin-top: var(--gap-lg);
}
.load-more-btn {
    background: var(--primary-color);
    color: var(--text-dark);
    border: none;
    padding: 12px 30px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}
.load-more-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
}

/* 服务优势区域样式 */
.service-advantages {
    padding: var(--gap-lg) 0;
    background: var(--bg-light);
    margin-top: var(--gap-lg);
}

.service-advantages h2 {
    text-align: center;
    margin-bottom: var(--gap-lg);
    font-size: 24px;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--gap-lg);
}

.advantage-item {
    text-align: center;
    padding: var(--gap-md);
    background: white;
    border-radius: 10px;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s;
}

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

.advantage-item h3 {
    font-size: 18px;
    margin-bottom: var(--gap-sm);
    color: var(--text-dark);
}

.advantage-item p {
    color: var(--text-gray);
    font-size: 14px;
}