/* ========================================
   瑞时国际展览官网样式表
   设计风格：简洁、专业、高端
======================================== */

/* ----------------------------------------
   CSS变量定义
---------------------------------------- */
:root {
    --color-primary: #FF7F00;
    --color-primary-hover: #E66F00;
    --color-text-title: #E8E8E8;
    --color-text-body: #CCCCCC;
    --color-text-light: #999999;
    --color-border: #4A4A4A;
    --color-bg-light: #3A3A3A;
    --color-white: #404040;
    --font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
    --section-padding: 100px 0;
    --container-max-width: 1200px;
    --transition-fast: 0.3s ease;
}

/* ----------------------------------------
   基础重置
---------------------------------------- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.8;
    color: #CCCCCC;
    background-color: #363636;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%233D3D3D' fill-opacity='0.4'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary);
}

ul {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--color-text-title);
    font-weight: 500;
    line-height: 1.4;
}

/* ----------------------------------------
   容器
---------------------------------------- */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ----------------------------------------
   通用按钮
---------------------------------------- */
.btn {
    display: inline-block;
    padding: 14px 32px;
    font-size: 15px;
    font-weight: 500;
    text-align: center;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    color: #fff;
}

/* ----------------------------------------
   通用区块
---------------------------------------- */
.section {
    padding: var(--section-padding);
    border-bottom: 1px solid var(--color-border);
}

.section-title {
    font-size: 32px;
    text-align: center;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 16px;
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: 60px;
}

/* ----------------------------------------
   导航栏
---------------------------------------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: #2A2A2A;
    border-bottom: none;
}

.header.scrolled {
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.logo-text {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text-title);
    letter-spacing: 1px;
}

.nav-list {
    display: flex;
    gap: 48px;
}

.nav-link {
    font-size: 15px;
    color: #FFFFFF;
    position: relative;
    padding: 4px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-fast);
}

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

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: #FFFFFF;
    margin: 4px 0;
    transition: all var(--transition-fast);
}

/* ----------------------------------------
   Hero区域
---------------------------------------- */
.hero {
    position: relative;
    padding-top: 72px;
    min-height: 85vh;
    display: flex;
    align-items: center;
}

.hero-image {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.hero-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(42, 42, 42, 0.85) 0%, rgba(54, 54, 54, 0.75) 50%, rgba(42, 42, 42, 0.90) 100%);
    z-index: 1;
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 80px 24px;
}

.hero-title {
    font-size: 48px;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 24px;
    color: var(--color-text-title);
}

.hero-subtitle {
    font-size: 18px;
    color: var(--color-text-light);
    margin-bottom: 48px;
    letter-spacing: 2px;
}

/* ----------------------------------------
   服务优势
---------------------------------------- */
.advantages {
    background-color: #3E3E3E;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
}

.advantage-item {
    padding: 48px 32px;
    text-align: center;
    border-right: 1px solid var(--color-border);
}

.advantage-item:last-child {
    border-right: none;
}

.advantage-icon {
    font-size: 40px;
    margin-bottom: 24px;
}

.advantage-icon img {
    width: 48px;
    height: 48px;
    margin: 0 auto;
}

.advantage-title {
    font-size: 18px;
    margin-bottom: 12px;
}

.advantage-desc {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.8;
}

/* ----------------------------------------
   展会项目
---------------------------------------- */
.exhibitions {
    background-color: #3E3E3E;
}

/* Tab导航 */
.exhibition-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 10px 28px;
    border: 1px solid var(--color-border);
    background: transparent;
    color: var(--color-text-light);
    font-size: 15px;
    cursor: pointer;
    transition: var(--transition-fast);
    font-family: var(--font-family);
    letter-spacing: 1px;
}

.tab-btn:hover {
    color: var(--color-text-title);
    border-color: var(--color-text-title);
}

.tab-btn.active {
    background-color: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

/* 展会卡片网格 */
.exhibitions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
}

/* 展会卡片 */
.fair-card {
    padding: 20px 24px;
    border: 1px solid var(--color-border);
    cursor: pointer;
    transition: border-color 0.3s ease, padding 0.3s ease;
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-height: auto;
    position: relative;
}

.fair-card:hover {
    border: 2px solid var(--color-primary);
    padding: 19px 23px;
}

.fair-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: transparent;
    transition: background 0.3s;
    pointer-events: none;
}

.fair-card:hover::after {
    background: rgba(255, 127, 0, 0.03);
}

.fair-card:active {
    transform: scale(0.995);
}

.fair-badge {
    display: inline-block;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 2px;
    width: fit-content;
    font-weight: 500;
}

.fair-badge.status-departing {
    background-color: #E53935;
    color: #fff;
}

.fair-badge.status-recruiting {
    background-color: #FF7F00;
    color: #fff;
}

.fair-badge.status-ended {
    background-color: #888;
    color: #fff;
}

.fair-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text-title);
    line-height: 1.4;
}

.fair-en {
    font-size: 12px;
    color: var(--color-text-light);
    letter-spacing: 0.3px;
}

.fair-location {
    font-size: 14px;
    color: var(--color-text-body);
}

.fair-time {
    font-size: 13px;
    color: var(--color-text-body);
}

.fair-cycle {
    font-size: 13px;
    color: var(--color-text-light);
}

.fair-tags {
    font-size: 12px;
    color: var(--color-text-light);
    margin-top: 4px;
}

/* ----------------------------------------
   展会案例
---------------------------------------- */
.cases {
    background-color: #2A2A2A;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.case-card {
    background-color: #3E3E3E;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    cursor: pointer;
}

.case-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}

.case-img {
    width: 100%;
    height: 240px;
    overflow: hidden;
    background-color: #2A2A2A;
}

.case-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.7;
}

.case-card:hover .case-img img {
    opacity: 0.9;
}

.case-info {
    padding: 24px;
}

.case-tag {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--color-primary);
    color: #FFFFFF;
    font-size: 12px;
    border-radius: 4px;
    margin-bottom: 12px;
}

.case-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-title);
    margin-bottom: 8px;
}

.case-desc {
    font-size: 14px;
    color: var(--color-text-body);
    margin-bottom: 16px;
    line-height: 1.6;
}

.case-stats {
    display: flex;
    gap: 24px;
    padding-top: 12px;
    border-top: 1px solid var(--color-border);
}

.case-stats .stat {
    font-size: 13px;
    color: var(--color-primary);
    font-weight: 500;
}

/* 更多案例 */
.more-cases {
    margin-top: 32px;
}

.cases-more-section {
    text-align: center;
    margin-top: 48px;
}

.cases-more-btn {
    padding: 14px 48px;
    font-size: 15px;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: #FF7F00;
    color: #FFFFFF;
    border: none;
    cursor: pointer;
}

.cases-more-btn .cases-more-icon {
    font-size: 12px;
    transition: transform var(--transition-fast);
}

.cases-more-btn.active .cases-more-icon {
    transform: rotate(180deg);
}

/* 隐藏元素 */
.hidden {
    display: none !important;
}

/* ----------------------------------------
   展会详情弹窗
---------------------------------------- */
.expo-detail-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.85);
    z-index: 9999;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.expo-detail-overlay.active {
    opacity: 1;
    visibility: visible;
}

.detail-container {
    max-width: 1100px;
    margin: 40px auto;
    background-color: #2A2A2A;
    border-radius: 12px;
    position: relative;
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.expo-detail-overlay.active .detail-container {
    transform: translateY(0);
}

.detail-header {
    display: flex;
    justify-content: flex-end;
    padding: 20px 20px 0;
}

.detail-close-top {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--color-primary);
    border: none;
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    transition: background-color 0.3s;
}

.detail-close-top:hover {
    background-color: var(--color-primary-hover);
}

/* ----------------------------------------
   案例详情弹窗
---------------------------------------- */
.case-detail-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.85);
    z-index: 9998;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.case-detail-overlay.active {
    opacity: 1;
    visibility: visible;
}

.case-detail-container {
    max-width: 900px;
    margin: 40px auto;
    background-color: #2A2A2A;
    border-radius: 12px;
    position: relative;
    padding: 32px;
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.case-detail-overlay.active .case-detail-container {
    transform: translateY(0);
}

.case-detail-close {
    position: fixed;
    top: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    background-color: var(--color-primary);
    border: none;
    border-radius: 50%;
    color: #FFFFFF;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast);
    z-index: 9999;
}

.case-detail-close:hover {
    background-color: var(--color-primary-hover);
}

/* ----------------------------------------
   关于我们
---------------------------------------- */
.about {
    background-color: #3E3E3E;
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-text {
    text-align: center;
    margin-bottom: 32px;
}

.about-lead {
    font-size: 24px;
    color: var(--color-text-title);
    margin-bottom: 24px;
}

.about-text p {
    color: var(--color-text-body);
    line-height: 1.9;
    margin-bottom: 16px;
}

.about-values {
    text-align: center;
    margin-bottom: 48px;
}

.value-tag {
    display: inline-block;
    padding: 12px 32px;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    font-size: 16px;
    border-radius: 4px;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
}

.highlight-item {
    padding: 32px;
    text-align: center;
    border-right: 1px solid var(--color-border);
    background-color: #2A2A2A;
}

.highlight-item:last-child {
    border-right: none;
}

.highlight-num {
    display: block;
    font-size: 36px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.highlight-label {
    font-size: 14px;
    color: var(--color-text-light);
}

/* ----------------------------------------
   联系我们
---------------------------------------- */
.contact {
    background-color: #2A2A2A;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    max-width: 900px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.contact-label {
    font-size: 14px;
    color: var(--color-text-light);
}

.contact-value {
    font-size: 16px;
    color: var(--color-text-title);
}

.contact-value a:hover {
    color: var(--color-primary);
}

.contact-qrcode {
    text-align: center;
}

.qrcode-title {
    font-size: 18px;
    color: var(--color-text-title);
    margin-bottom: 24px;
}

.qrcode-img img {
    width: 200px;
    height: 200px;
    margin: 0 auto;
    border-radius: 8px;
}

.qrcode-tip {
    margin-top: 16px;
    font-size: 14px;
    color: var(--color-text-light);
}

/* ----------------------------------------
   页脚
---------------------------------------- */
.footer {
    background-color: #2A2A2A;
    padding: 48px 0;
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 600;
    color: var(--color-text-title);
    letter-spacing: 2px;
}

.footer-slogan {
    font-size: 14px;
    color: var(--color-text-light);
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    font-size: 14px;
    color: var(--color-text-body);
}

.footer-links a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    font-size: 13px;
    color: var(--color-text-light);
}

/* ----------------------------------------
   右侧浮动侧边栏
---------------------------------------- */
.floating-sidebar {
    position: fixed;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.sidebar-item {
    width: auto;
    min-width: 48px;
    height: 32px;
    padding: 0 10px;
    background: #3A3A3A;
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    color: #CCCCCC;
    font-size: 11px;
    position: relative;
    transition: background-color var(--transition-fast);
}

.sidebar-item:hover {
    background-color: var(--color-primary);
    color: #fff;
}

.sidebar-item svg {
    flex-shrink: 0;
}

.sidebar-qr-popup {
    position: absolute;
    right: 60px;
    top: 50%;
    transform: translateY(-50%);
    width: 224px;
    background-color: #FFFFFF;
    padding: 12px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: all 0.3s ease;
    z-index: 10000;
}

.sidebar-item.qr-active .sidebar-qr-popup {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.sidebar-qr-popup img {
    width: 200px;
    height: 200px;
    display: block;
    object-fit: contain;
}

.sidebar-qr-popup::after {
    content: '';
    position: absolute;
    right: -6px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    border-left: 6px solid #FFFFFF;
}

#sidebarTopBtn.hidden {
    display: none !important;
}

/* ----------------------------------------
   响应式设计
---------------------------------------- */
@media (max-width: 1024px) {
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .advantage-item:nth-child(2) {
        border-right: none;
    }
    
    .advantage-item:nth-child(3) {
        border-top: 1px solid var(--color-border);
    }
    
    .advantage-item:nth-child(4) {
        border-top: 1px solid var(--color-border);
    }
    
    .exhibitions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-highlights {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .highlight-item:nth-child(2) {
        border-right: none;
    }
    
    .highlight-item:nth-child(3) {
        border-top: 1px solid var(--color-border);
        border-right: 1px solid var(--color-border);
    }
    
    .highlight-item:nth-child(4) {
        border-top: 1px solid var(--color-border);
    }
    
    .detail-container {
        max-width: 95%;
    }
}

@media (max-width: 768px) {
    /* 导航栏优化 */
    .nav {
        height: 60px;
    }
    
    .logo-text {
        font-size: 16px;
    }
    
    .nav-list {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background-color: #2A2A2A;
        flex-direction: column;
        padding: 16px;
        gap: 0;
        border-bottom: 1px solid var(--color-border);
        z-index: 1000;
    }
    
    .nav-list.active {
        display: flex;
    }
    
    .nav-link {
        display: block;
        padding: 16px 0;
        font-size: 16px;
        border-bottom: 1px solid var(--color-border);
        min-height: 48px;
        line-height: 1.2;
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }
    
    .nav-toggle {
        display: flex;
        width: 44px;
        height: 44px;
        padding: 10px;
        cursor: pointer;
    }
    
    .nav-toggle span {
        display: block;
        width: 100%;
        height: 2px;
        background-color: #fff;
        border-radius: 2px;
        transition: all 0.3s;
    }
    
    .nav-toggle span:nth-child(2) {
        margin: 6px 0;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    /* Hero区域优化 */
    .hero {
        min-height: 70vh;
    }
    
    .hero-image {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
    }
    
    .hero-image img {
        object-fit: cover;
        opacity: 0.5;
    }
    
    .hero-content {
        position: relative;
        z-index: 1;
        padding: 100px 24px 80px;
    }
    
    .hero-title {
        font-size: 28px;
        line-height: 1.3;
    }
    
    .hero-subtitle {
        font-size: 14px;
        margin-bottom: 24px;
    }
    
    .hero .btn {
        width: 100%;
        max-width: 280px;
        padding: 16px 24px;
    }
    
    /* 通用区块优化 */
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 24px;
        margin-bottom: 12px;
    }
    
    .section-desc {
        font-size: 14px;
        color: var(--color-text-light);
        margin-bottom: 40px;
        padding: 0 16px;
    }
    
    /* 服务优势优化 */
    .advantages-grid {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    .advantage-item {
        border-right: none !important;
        border-bottom: 1px solid var(--color-border) !important;
        padding: 24px 16px;
    }
    
    .advantage-item:last-child {
        border-bottom: none !important;
    }
    
    .advantage-icon img {
        width: 48px;
        height: 48px;
    }
    
    .advantage-title {
        font-size: 16px;
    }
    
    .advantage-desc {
        font-size: 14px;
    }
    
    /* 展会Tab优化 */
    .exhibition-tabs {
        display: flex;
        flex-wrap: nowrap;
        overflow-x: auto;
        gap: 8px;
        padding-bottom: 8px;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }
    
    .exhibition-tabs::-webkit-scrollbar {
        display: none;
    }
    
    .tab-btn {
        flex-shrink: 0;
        padding: 10px 16px;
        font-size: 13px;
        min-height: 44px;
        white-space: nowrap;
    }
    
    /* 展会卡片优化 */
    .exhibitions-grid {
        grid-template-columns: 1fr;
        gap: 16px;
        padding: 0 16px;
    }
    
    .fair-card {
        padding: 20px 16px;
    }
    
    .fair-name {
        font-size: 15px;
    }
    
    .fair-tags {
        margin-top: 8px;
    }
    
    /* 案例卡片优化 */
    .cases-grid {
        grid-template-columns: 1fr;
        gap: 16px;
        padding: 0 16px;
    }
    
    .case-card {
        margin-bottom: 0;
    }
    
    .case-img {
        height: 180px;
    }
    
    .case-info {
        padding: 16px;
    }
    
    .case-title {
        font-size: 16px;
    }
    
    .case-stats {
        flex-wrap: wrap;
        gap: 12px;
    }
    
    .cases-more-section {
        margin-top: 32px;
        padding: 0 16px;
    }
    
    .cases-more-btn {
        width: 100%;
        padding: 16px;
        min-height: 48px;
    }
    
    /* 关于我们优化 */
    .about {
        padding: 60px 16px;
    }
    
    .about-content {
        padding: 0;
    }
    
    .about-lead {
        font-size: 18px;
    }
    
    .about-text p {
        font-size: 14px;
        line-height: 1.8;
    }
    
    .about-highlights {
        grid-template-columns: repeat(2, 1fr);
        margin-top: 32px;
    }
    
    .highlight-item {
        padding: 20px 12px;
        border-right: none !important;
        border-bottom: 1px solid var(--color-border) !important;
    }
    
    .highlight-item:nth-child(2),
    .highlight-item:nth-child(4) {
        border-right: none !important;
    }
    
    .highlight-item:nth-child(3),
    .highlight-item:nth-child(4) {
        border-top: 1px solid var(--color-border) !important;
    }
    
    .highlight-item:nth-child(3) {
        border-right: 1px solid var(--color-border) !important;
    }
    
    .highlight-num {
        font-size: 28px;
    }
    
    .highlight-label {
        font-size: 12px;
    }
    
    /* 联系我们优化 */
    .contact {
        padding: 60px 16px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .contact-info {
        gap: 20px;
    }
    
    .contact-item {
        gap: 6px;
    }
    
    .contact-label {
        font-size: 13px;
    }
    
    .contact-value {
        font-size: 15px;
    }
    
    .contact-value a {
        display: inline-block;
        min-height: 44px;
        line-height: 44px;
    }
    
    .contact-qrcode {
        padding-top: 20px;
        border-top: 1px solid var(--color-border);
    }
    
    .qrcode-img img {
        width: 160px;
        height: 160px;
    }
    
    /* 页脚优化 */
    .footer {
        padding: 32px 16px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }
    
    .footer-logo {
        font-size: 20px;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 20px;
    }
    
    .footer-links a {
        font-size: 14px;
        min-height: 44px;
        line-height: 44px;
    }
    
    /* 浮动侧边栏优化 */
    .floating-sidebar {
        right: 8px;
        bottom: 80px;
    }
    
    .sidebar-item {
        width: 44px;
        height: 44px;
        min-width: 44px;
        justify-content: center;
        padding: 0;
    }
    
    .sidebar-item span {
        display: none;
    }
    
    .sidebar-item svg {
        width: 20px;
        height: 20px;
    }
    
    .sidebar-qr-popup {
        right: 52px;
        width: 180px;
        padding: 10px;
    }
    
    .sidebar-qr-popup img {
        width: 160px;
        height: 160px;
    }
    
    /* 展会详情弹窗优化 */
    .expo-detail-overlay {
        z-index: 10001;
    }
    
    .detail-container {
        margin: 0;
        border-radius: 0;
        min-height: 100vh;
        max-width: 100%;
    }
    
    .detail-header {
        padding: 12px 12px 0;
        position: sticky;
        top: 0;
        background: #2A2A2A;
        z-index: 10;
    }
    
    .detail-close-top {
        width: 44px;
        height: 44px;
        font-size: 18px;
    }
    
    .detail-content {
        padding: 16px;
    }
    
    .detail-title {
        font-size: 20px;
        line-height: 1.3;
        padding-right: 40px;
    }
    
    .detail-title-en {
        font-size: 13px;
    }
    
    .detail-meta {
        flex-direction: column;
        gap: 12px;
        padding: 16px;
        margin: 16px 0;
    }
    
    .detail-meta-item {
        font-size: 13px;
    }
    
    .detail-meta-item .label {
        min-width: 60px;
    }
    
    .detail-intro {
        font-size: 14px;
        line-height: 1.8;
    }
    
    .detail-products {
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .detail-product-tag {
        padding: 6px 12px;
        font-size: 12px;
    }
    
    .detail-stats {
        flex-wrap: wrap;
        gap: 16px;
    }
    
    .detail-stat {
        flex: 1;
        min-width: 100px;
        padding: 16px 12px;
    }
    
    .detail-stat .value {
        font-size: 20px;
    }
    
    .detail-stat .label {
        font-size: 12px;
    }
    
    .detail-action {
        padding: 20px 16px;
    }
    
    .detail-action .btn {
        width: 100%;
        padding: 16px;
        min-height: 52px;
        font-size: 16px;
    }
    
    .detail-footer {
        padding: 16px;
        font-size: 12px;
    }
    
    /* 案例详情弹窗优化 */
    .case-detail-overlay {
        z-index: 10000;
    }
    
    .case-detail-container {
        margin: 0;
        border-radius: 0;
        min-height: 100vh;
        max-width: 100%;
        padding: 60px 16px 24px;
    }
    
    .case-detail-close {
        position: fixed;
        top: 12px;
        right: 12px;
        width: 44px;
        height: 44px;
        font-size: 18px;
        z-index: 100;
    }
    
    .case-detail-title {
        font-size: 20px;
        line-height: 1.3;
    }
    
    .case-detail-content {
        font-size: 14px;
        line-height: 1.8;
    }
    
    .case-detail-stats {
        flex-wrap: wrap;
        gap: 16px;
    }
    
    .case-detail-stat {
        flex: 1;
        min-width: 100px;
    }
}

@media (max-width: 576px) {
    /* 导航栏 */
    .nav {
        padding: 0 12px;
    }
    
    .logo-text {
        font-size: 14px;
    }
    
    /* Hero区域 */
    .hero {
        min-height: 60vh;
    }
    
    .hero-content {
        padding: 80px 12px 60px;
    }
    
    .hero-title {
        font-size: 22px;
    }
    
    .hero-subtitle {
        font-size: 13px;
    }
    
    .hero .btn {
        font-size: 14px;
        padding: 14px 20px;
    }
    
    /* 区块 */
    .section {
        padding: 48px 0;
    }
    
    .section-title {
        font-size: 20px;
    }
    
    .section-desc {
        font-size: 13px;
        margin-bottom: 32px;
    }
    
    /* 服务优势 */
    .advantage-item {
        padding: 20px 12px;
    }
    
    .advantage-icon img {
        width: 40px;
        height: 40px;
    }
    
    .advantage-title {
        font-size: 15px;
    }
    
    .advantage-desc {
        font-size: 13px;
    }
    
    /* 展会Tab */
    .exhibition-tabs {
        padding: 0 12px 8px;
    }
    
    .tab-btn {
        padding: 8px 12px;
        font-size: 12px;
    }
    
    /* 展会卡片 */
    .exhibitions-grid {
        padding: 0 12px;
        gap: 12px;
    }
    
    .fair-card {
        padding: 16px 12px;
    }
    
    .fair-name {
        font-size: 14px;
    }
    
    .fair-en {
        font-size: 11px;
    }
    
    /* 案例卡片 */
    .cases-grid {
        padding: 0 12px;
        gap: 12px;
    }
    
    .case-img {
        height: 160px;
    }
    
    .case-info {
        padding: 12px;
    }
    
    .case-title {
        font-size: 15px;
    }
    
    .case-desc {
        font-size: 13px;
    }
    
    .case-stats {
        gap: 8px;
    }
    
    .case-stats .stat {
        font-size: 12px;
    }
    
    .cases-more-section {
        padding: 0 12px;
    }
    
    /* 关于我们 */
    .about {
        padding: 48px 12px;
    }
    
    .about-lead {
        font-size: 16px;
    }
    
    .about-text p {
        font-size: 13px;
    }
    
    .about-highlights {
        margin-top: 24px;
    }
    
    .highlight-item {
        padding: 16px 8px;
    }
    
    .highlight-num {
        font-size: 24px;
    }
    
    .highlight-label {
        font-size: 11px;
    }
    
    /* 联系我们 */
    .contact {
        padding: 48px 12px;
    }
    
    .qrcode-img img {
        width: 140px;
        height: 140px;
    }
    
    /* 弹窗 */
    .detail-container {
        padding-top: 56px;
    }
    
    .detail-header {
        padding: 8px 8px 0;
    }
    
    .detail-close-top {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
    
    .detail-content {
        padding: 12px;
    }
    
    .detail-title {
        font-size: 18px;
        padding-right: 32px;
    }
    
    .detail-meta {
        padding: 12px;
        gap: 10px;
    }
    
    .detail-meta-item {
        font-size: 12px;
    }
    
    .detail-intro {
        font-size: 13px;
        line-height: 1.7;
    }
    
    .detail-products {
        gap: 6px;
    }
    
    .detail-product-tag {
        padding: 5px 10px;
        font-size: 11px;
    }
    
    .detail-stat .value {
        font-size: 18px;
    }
    
    .detail-stat .label {
        font-size: 11px;
    }
    
    .detail-action {
        padding: 16px 12px;
    }
    
    .detail-action .btn {
        padding: 14px;
        font-size: 15px;
    }
    
    .case-detail-container {
        padding: 56px 12px 20px;
    }
    
    .case-detail-close {
        top: 8px;
        right: 8px;
        width: 40px;
        height: 40px;
    }
    
    /* 页脚 */
    .footer {
        padding: 24px 12px;
    }
    
    .footer-logo {
        font-size: 18px;
    }
    
    .footer-slogan {
        font-size: 12px;
    }
    
    .footer-links {
        gap: 16px;
    }
    
    .footer-links a {
        font-size: 13px;
    }
    
    /* 侧边栏 */
    .floating-sidebar {
        right: 4px;
        bottom: 60px;
    }
    
    .sidebar-item {
        width: 40px;
        height: 40px;
        min-width: 40px;
    }
    
    .sidebar-item svg {
        width: 18px;
        height: 18px;
    }
    
    .sidebar-qr-popup {
        right: 48px;
        width: 160px;
        padding: 8px;
    }
    
    .sidebar-qr-popup img {
        width: 144px;
        height: 144px;
    }
}

/* 触控设备额外优化 */
@media (hover: none) and (pointer: coarse) {
    /* 增大触控区域 */
    .nav-link {
        min-height: 48px;
        display: flex;
        align-items: center;
    }
    
    .btn {
        min-height: 48px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
    
    .tab-btn {
        min-height: 44px;
    }
    
    .sidebar-item {
        min-height: 44px;
    }
    
    /* 禁用hover效果的闪烁 */
    .case-card:hover {
        transform: none;
        box-shadow: none;
    }
    
    .case-card:active {
        transform: scale(0.98);
        background-color: #454545;
    }
    
    .fair-card:hover {
        transform: none;
    }
    
    .fair-card:active {
        transform: scale(0.98);
    }
}