/* ========================================
 * 全局样式
 * ======================================== */

:root {
    /* 主色调 - 深蓝色，代表纽约的都市感 */
    --primary-color: #1e3a5f;
    --primary-dark: #152a41;
    --primary-light: #2a4a7f;
    
    /* 辅助色 - 金色/铜色，代表建筑的历史感 */
    --accent-color: #c9a227;
    --accent-dark: #a8861f;
    
    /* 强调色 - 橙色，用于重要元素 */
    --highlight-color: #ff6b35;
    
    /* 中性色 */
    --white: #ffffff;
    --light-gray: #f8f9fa;
    --medium-gray: #6c757d;
    --dark-gray: #343a40;
    --darker-gray: #1e2125;
    
    /* 文字颜色 */
    --text-primary: #1e2125;
    --text-secondary: #6c757d;
    --text-light: #ffffff;
    
    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    
    /* 间距 */
    --spacing-xs: 0.35rem;
    --spacing-sm: 0.7rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.4rem;
    --spacing-xl: 2rem;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* 过渡动画 */
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--light-gray);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
}

/* ========================================
 * 头部导航
 * ======================================== */

.header {
    background-color: var(--primary-color);
    color: var(--text-light);
    padding: 0.6rem 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.site-title {
    font-family: 'Poppins', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--white);
    margin: 0;
    flex-shrink: 0;
}

.site-title a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

.site-title a:hover {
    color: var(--accent-color);
}

/* ========================================
 * 页面导航
 * ======================================== */

.nav-container {
    max-width: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.nav-item {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
}

.nav-item:hover {
    color: var(--white);
    background-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-1px);
}

.nav-item.active {
    color: var(--white);
    background-color: rgba(255, 255, 255, 0.25);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* ========================================
 * 主内容区域
 * ======================================== */

.main {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
    min-height: 70vh;
}

.section {
    margin-bottom: var(--spacing-lg);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-xs) 0;
}

.section-header h2 {
    font-family: 'Poppins', sans-serif;
    font-size: 1.75rem;
    color: var(--primary-color);
    margin: 0 0 var(--spacing-xs) 0;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.section-header p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 1rem;
    line-height: 1.4;
}

.section-more {
    color: var(--accent-color);
    font-weight: 600;
    text-decoration: none;
    font-size: 0.95rem;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 2px;
}

.section-more:hover {
    color: var(--accent-dark);
    transform: translateX(3px);
}

/* ========================================
 * 建筑卡片
 * ======================================== */

.building-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--spacing-xl);
    min-height: 400px;
    align-items: stretch;
}

/* PC大屏幕：每行显示3个 */
@media (min-width: 1200px) {
    .building-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.building-card {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    border: 1px solid rgba(0, 0, 0, 0.05);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.building-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.building-card:hover::before {
    transform: scaleX(1);
}

.building-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.building-card-image {
    width: 100%;
    height: 240px;
    object-fit: cover;
    background-color: var(--light-gray);
    transition: transform 0.4s ease;
}

.building-card:hover .building-card-image {
    transform: scale(1.05);
}

.building-card-content {
    padding: var(--spacing-md);
    flex-grow: 1;
}

.building-card-title {
    font-family: 'Poppins', sans-serif;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0 0 var(--spacing-sm) 0;
    line-height: 1.4;
}

.building-card-description {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.6;
}

.building-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    align-items: center;
}

.building-card-tag {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    background-color: rgba(30, 58, 95, 0.1);
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.building-card-tag:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

.building-card-tag.hot {
    background-color: rgba(255, 107, 53, 0.15);
    color: var(--highlight-color);
}

.building-card-tag.hot:hover {
    background-color: var(--highlight-color);
    color: var(--white);
}

/* ========================================
 * Hero 区域
 * ======================================== */

.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: var(--spacing-xl) var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -20%;
    left: -20%;
    width: 60%;
    height: 60%;
    background: radial-gradient(circle, rgba(201, 162, 39, 0.1) 0%, transparent 60%);
    border-radius: 50%;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-family: 'Poppins', sans-serif;
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    letter-spacing: -1px;
}

.hero p {
    font-size: 1.35rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* ========================================
 * 分类导航
 * ======================================== */

.category-nav {
    display: flex;
    gap: var(--spacing-sm);
    overflow-x: auto;
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    justify-content: center;
    padding: var(--spacing-md);
    background-color: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.category-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--light-gray);
    color: var(--primary-color);
    border: none;
    border-radius: 30px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    font-size: 1rem;
}

.category-btn:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.category-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--white);
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(30, 58, 95, 0.4);
}

/* ========================================
 * 建筑详情页
 * ======================================== */

.building-detail {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.building-detail-header {
    position: relative;
}

.building-detail-image {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

.building-detail-info {
    padding: var(--spacing-xl);
}

.building-detail-title {
    font-family: 'Poppins', sans-serif;
    font-size: 2.25rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.building-detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
}

.building-detail-section {
    margin-bottom: var(--spacing-lg);
}

.building-detail-section h3 {
    font-size: 1.25rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.building-detail-specs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.building-spec {
    background-color: var(--light-gray);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
}

.building-spec-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.building-spec-value {
    font-weight: 600;
    color: var(--primary-color);
}

.back-link {
    display: inline-flex;
    align-items: center;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    transition: var(--transition);
}

.back-link:hover {
    color: var(--accent-color);
}

.breadcrumb {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
}

.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    padding: 6px 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.breadcrumb a:hover {
    color: var(--accent-color);
    background-color: rgba(201, 162, 39, 0.1);
}

/* ========================================
 * 相关建筑推荐
 * ======================================== */

.related-buildings {
    margin-top: var(--spacing-xl);
}

.related-buildings h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

/* ========================================
 * 页脚
 * ======================================== */

.footer {
    background-color: var(--primary-color);
    color: var(--text-light);
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-md) var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-top {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-links-wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--spacing-lg);
}

.footer-brand h2 {
    font-family: 'Poppins', sans-serif;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.footer-brand p {
    opacity: 0.9;
    margin-bottom: var(--spacing-sm);
}

.footer-section h4 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    transition: var(--transition);
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    display: block;
    font-size: 1rem;
}

.footer-section ul li a:hover {
    color: var(--accent-color);
    background-color: rgba(255, 255, 255, 0.1);
}

.footer-bottom {
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    opacity: 0.8;
}

/* ========================================
 * 广告位预留
 * ======================================== */

.ad-container {
    background-color: var(--light-gray);
    border: 2px dashed var(--medium-gray);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    margin: var(--spacing-lg) 0;
}

.ad-banner {
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ad-sidebar {
    min-height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ad-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ========================================
 * 页面内容模板
 * ======================================== */

.page-content {
    background-color: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.page-title {
    font-family: 'Poppins', sans-serif;
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.page-content h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-top: var(--spacing-lg) 0 var(--spacing-sm) 0;
}

.page-content p {
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.page-content ul {
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.page-content li {
    margin-bottom: var(--spacing-xs);
}

/* ========================================
 * 按钮样式
 * ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: 30px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
    font-size: 1rem;
    box-shadow: var(--shadow-sm);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--white);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-dark));
    color: var(--white);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, var(--accent-dark), var(--accent-color));
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

/* ========================================
 * 联系表单
 * ======================================== */

.contact-form {
    display: grid;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--primary-color);
}

.form-group input,
.form-group textarea {
    padding: var(--spacing-sm);
    border: 2px solid var(--light-gray);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

/* ========================================
 * 联系页面样式
 * ======================================== */

.contact-page {
    max-width: 1000px;
    margin: 0 auto;
}

.contact-hero {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-xl);
}

.contact-title {
    font-family: 'Poppins', sans-serif;
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.contact-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.contact-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.contact-card {
    background-color: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all 0.3s ease;
}

.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.contact-card h3 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.contact-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin: 0 0 var(--spacing-xs) 0;
}

.contact-link {
    display: inline-block;
    color: var(--accent-color);
    font-weight: 600;
    text-decoration: none;
    margin-top: var(--spacing-sm);
    transition: var(--transition);
}

.contact-link:hover {
    color: var(--accent-dark);
    text-decoration: underline;
}

.contact-form-wrapper {
    background-color: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.contact-form-wrapper h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.form-intro {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-form input,
.contact-form textarea {
    padding: var(--spacing-sm);
    border: 2px solid var(--light-gray);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    width: 100%;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: var(--medium-gray);
}

.btn-full {
    width: 100%;
}

.form-success {
    text-align: center;
    padding: var(--spacing-xl);
}

.form-success.hidden {
    display: none;
}

.success-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.form-success h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.form-success p {
    color: var(--text-secondary);
}

/* FAQ Section */
.faq-section {
    background-color: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.faq-section h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.faq-item {
    border-bottom: 1px solid var(--light-gray);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-toggle {
    width: 100%;
    padding: var(--spacing-md) 0;
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
}

.faq-question {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1rem;
}

.faq-arrow {
    font-size: 0.8rem;
    color: var(--medium-gray);
    transition: transform 0.3s ease;
}

.faq-arrow.rotated {
    transform: rotate(180deg);
}

.faq-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-content.active {
    max-height: 200px;
}

.faq-content p {
    color: var(--text-secondary);
    padding: 0 0 var(--spacing-md) 0;
    line-height: 1.6;
}

/* ========================================
 * 响应式设计 - 平板端优化 (768-992px)
 * ======================================== */

@media (max-width: 992px) {
    .hero h1 {
        font-size: 2.25rem;
    }
    
    .hero p {
        font-size: 1.15rem;
    }
    
    .building-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
        gap: var(--spacing-lg);
    }
    
    .building-card-image {
        height: 220px;
    }
}

/* ========================================
 * 响应式设计 - 移动端优化
 * ======================================== */

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 0.75rem;
        padding: 0.75rem var(--spacing-md);
    }
    
    .site-title {
        font-size: 1.3rem;
    }
    
    .nav-container {
        justify-content: flex-start;
        padding: 0;
        gap: 0.5rem;
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        width: 100%;
    }
    
    .nav-container::-webkit-scrollbar {
        display: none;
    }
    
    .nav-item {
        padding: 0.7rem 1.1rem;
        font-size: 0.9rem;
        font-weight: 700;
        flex-shrink: 0;
        border-radius: 10px;
        background: rgba(255, 255, 255, 0.05);
        letter-spacing: 0.3px;
    }
    
    .nav-item:hover {
        background: rgba(255, 255, 255, 0.15);
        transform: translateY(-2px) scale(1.02);
    }
    
    .nav-item.active {
        background: linear-gradient(135deg, var(--accent-color), var(--accent-dark));
        box-shadow: 0 4px 15px rgba(57, 108, 191, 0.4);
        color: white;
    }
    
    .hero {
        padding: var(--spacing-xl) var(--spacing-md);
        margin: 0 -16px var(--spacing-xl) -16px;
        border-radius: 0;
    }
    
    .hero h1 {
        font-size: 1.9rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .building-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .building-card {
        border-radius: var(--radius-lg);
    }
    
    .building-card-image {
        height: 240px;
    }
    
    .building-card-content {
        padding: var(--spacing-md);
    }
    
    .building-card-title {
        font-size: 1.35rem;
        margin-bottom: var(--spacing-sm);
    }
    
    .building-card-description {
        font-size: 1rem;
    }
    
    .category-nav {
        justify-content: flex-start;
        gap: 10px;
    }
    
    .category-btn {
        padding: 12px 18px;
        font-size: 1rem;
        border-radius: var(--radius-md);
    }
    
    .building-detail-image {
        height: 280px;
    }
    
    .building-detail-info {
        padding: var(--spacing-lg);
    }
    
    .building-detail-title {
        font-size: 1.85rem;
    }
    
    .back-link {
        padding: 12px 16px;
        font-size: 1.05rem;
        background-color: var(--light-gray);
        border-radius: var(--radius-md);
    }
    
    .breadcrumb {
        font-size: 0.95rem;
    }
    
    .breadcrumb a {
        padding: 4px 0;
    }
    
    .footer-section ul li a {
        padding: 10px 0;
        display: block;
        font-size: 1rem;
    }
    
    .btn {
        padding: 14px 24px;
        font-size: 1.05rem;
        border-radius: var(--radius-md);
        width: 100%;
    }
    
    .form-group input,
    .form-group textarea {
        padding: 14px;
        font-size: 16px;
    }
    
    .building-spec {
        padding: var(--spacing-md);
    }
    
    .main {
        padding: var(--spacing-md);
    }
    
    /* Contact Page Mobile */
    .contact-title {
        font-size: 1.8rem;
    }
    
    .contact-subtitle {
        font-size: 1.1rem;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .contact-info {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-sm);
    }
    
    .contact-card {
        padding: var(--spacing-md);
    }
    
    .contact-icon {
        font-size: 2rem;
    }
    
    .contact-card h3 {
        font-size: 1rem;
    }
    
    .contact-card p {
        font-size: 0.85rem;
    }
    
    .contact-form-wrapper {
        padding: var(--spacing-lg);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .faq-section {
        padding: var(--spacing-lg);
    }
    
    .faq-question {
        font-size: 0.95rem;
    }
}

    /* Trending mobile - optimized for phones */
    .trending-grid {
      display: flex;
      flex-direction: column;
      gap: var(--spacing-md);
      width: 100%;
      margin: 0;
    }

    .trending-grid::before {
      display: none;
    }

    .trending-card {
      padding: 0 !important;
      justify-content: normal !important;
      width: 100%;
      margin: 0;
    }

    .trending-card.trending-left,
    .trending-card.trending-right {
      padding: 0 !important;
    }

    .trending-number {
      position: absolute;
      top: var(--spacing-sm);
      left: var(--spacing-sm);
      width: 36px;
      height: 36px;
      font-size: 1rem;
      z-index: 2;
      border: 3px solid var(--white);
    }

    .trending-card-inner {
      grid-template-columns: 1fr;
      max-width: 100%;
      width: 100%;
      box-shadow: var(--shadow-md);
      border-radius: var(--radius-lg);
      overflow: hidden;
    }

    .trending-image {
      height: 200px;
      width: 100%;
      object-fit: cover;
      display: block;
    }

    .trending-info {
      padding: var(--spacing-md);
    }

    .trending-category {
      font-size: 0.75rem;
    }

    .trending-title {
      font-size: 1.1rem;
    }

    .trending-desc {
      font-size: 0.85rem;
      margin-bottom: var(--spacing-sm);
    }

    .section-header {
        margin-bottom: var(--spacing-sm);
        align-items: center;
    }

    .section-header h2 {
        font-size: 1.35rem;
    }

    .section-header p {
        font-size: 0.9rem;
    }

    .section-more {
        font-size: 0.9rem;
        flex-shrink: 0;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 16px;
    }
    
    .main {
        padding: var(--spacing-md);
    }
    
    .section-header {
        align-items: flex-start;
    }

    .section-header h2 {
        font-size: 1.25rem;
    }

    .section-header p {
        font-size: 0.85rem;
    }

    .section-more {
        font-size: 0.85rem;
    }
    
    .site-title {
        font-size: 1.5rem;
    }
    
    .hero h1 {
        font-size: 1.7rem;
    }
    
    .nav-item {
        padding: 12px 16px;
        font-size: 1rem;
    }
    
    .building-card-image {
        height: 220px;
    }
    
    .building-detail-title {
        font-size: 1.65rem;
    }
    
    .page-title {
        font-size: 1.7rem;
    }

    /* Trending extra small screen optimization */
    .trending-grid {
      gap: var(--spacing-md);
      margin: 0;
    }

    .trending-number {
      width: 32px;
      height: 32px;
      font-size: 0.95rem;
      top: var(--spacing-sm);
      left: var(--spacing-sm);
    }

    .trending-image {
      height: 180px;
    }

    .trending-info {
      padding: var(--spacing-sm);
    }

    .trending-title {
      font-size: 1.05rem;
    }

    .trending-desc {
      font-size: 0.8rem;
      margin-bottom: var(--spacing-xs);
    }

    .trending-tags {
      gap: var(--spacing-xs);
    }

    .trending-tag {
      font-size: 0.7rem;
      padding: 3px 8px;
    }
}

/* ========================================
 * 通用链接样式优化
 * ======================================== */
a {
    transition: all 0.3s ease;
}

a:active {
    transform: scale(0.98);
}

/* ========================================
 * 加载状态
 * ======================================== */

.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--light-gray);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: var(--spacing-sm);
}

@keyframes spin {
    to {
        transform: rotate(360deg);
}

/* ========================================
 * 无障碍访问优化
 * ======================================== */

a:focus,
button:focus,
input:focus,
textarea:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

/* ========================================
 * 其他辅助样式
 * ======================================== */



.no-results {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--text-secondary);
}

/* Trending grid - zig-zag layout */
.trending-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  position: relative;
}

.trending-grid::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--accent-color), var(--primary-color));
  transform: translateX(-50%);
  border-radius: 3px;
}

.trending-card {
  display: flex;
  align-items: center;
  position: relative;
  transition: var(--transition);
  cursor: pointer;
}

.trending-card:hover {
  transform: scale(1.02);
}

.trending-card.trending-left {
  justify-content: flex-start;
  padding-right: calc(50% - 20px);
}

.trending-card.trending-right {
  justify-content: flex-end;
  padding-left: calc(50% - 20px);
}

.trending-number {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--accent-color), var(--accent-dark));
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  z-index: 2;
  box-shadow: var(--shadow-md);
  border: 4px solid var(--white);
}

.trending-card-inner {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  max-width: 420px;
  transition: var(--transition);
}

.trending-card:hover .trending-card-inner {
  box-shadow: var(--shadow-lg);
}

.trending-image {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.trending-info {
  padding: var(--spacing-sm);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.trending-category {
  font-size: 0.75rem;
  color: var(--accent-color);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-xs);
}

.trending-title {
  font-size: 1.1rem;
  color: var(--primary-color);
  margin: 0 0 var(--spacing-xs) 0;
  font-weight: 700;
}

.trending-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0 0 var(--spacing-sm) 0;
  line-height: 1.4;
}

.trending-tags {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.trending-tag {
  font-size: 0.7rem;
  padding: 3px 8px;
  background: var(--light-gray);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  font-weight: 500;
}