/* 响应式样式 */

/* 平板电脑和小屏幕设备 (768px - 1024px) */
@media screen and (max-width: 1024px) {
    .container {
        padding: 0 20px;
    }
    
    /* 头部导航 */
    .site-name h1 {
        font-size: 19px;
    }
    
    .site-name h2 {
        font-size: 14px;
    }
    
    .main-nav ul {
        gap: 10px;
    }
    
    .main-nav ul li a {
        padding: 8px;
        font-size: 14px;
    }
    
    /* 轮播图 */
    .banner-slider {
        height: 500px;
    }
    
    .slide-content h2 {
        font-size: 40px;
    }
    
    .slide-content p {
        font-size: 19px;
    }
    
    /* 内容部分 */
    .intro-content,
    .exhibition-content,
    .venue-content,
    .registration-content,
    .contact-content {
        flex-direction: column;
        gap: 30px;
    }
    
    .intro-image,
    .exhibition-gallery,
    .venue-image {
        margin-top: 20px;
    }
    
    .intro-features {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* 演讲嘉宾 */
    .speakers-grid {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    }
    
    /* 参展企业 */
    .exhibitors-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }
    
    /* 会议酒店 */
    .hotels-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
    
    /* 大会资讯 */
    .news-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
    
    /* 赞助商 */
    .sponsors-grid.diamond .sponsor-logo,
    .sponsors-grid.gold .sponsor-logo,
    .sponsors-grid.support .sponsor-logo {
        flex: 0 0 calc(50% - 30px);
    }
}

/* 移动设备 (最大767px) */
@media screen and (max-width: 767px) {
    /* 头部导航 */
    .site-header .container {
        flex-wrap: wrap;
    }
    
    .logo-area {
        width: 100%;
        justify-content: space-between;
        margin-bottom: 15px;
    }

    .main-nav {
        width: 100%;
        display: none;
    }
    
    .main-nav.active {
        display: block;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 0;
    }
    
    .main-nav ul li {
        width: 100%;
    }
    
    .main-nav ul li a {
        padding: 12px 0;
        border-bottom: 1px solid var(--grey-light);
    }
    
    .dropdown {
        position: static;
        display: none;
        box-shadow: none;
        padding-left: 20px;
    }
    
    .has-dropdown.active .dropdown {
        display: block;
    }
    
    /* 轮播图 */
    .banner-slider {
        height: 400px;
    }
    
    .slide-content {
        width: 90%;
    }
    
    .event-choice {
        flex-direction: column;
        gap: 10px;
    }
    
    .slide-content h2 {
        font-size: 32px;
    }
    
    .slide-content p {
        font-size: 16px;
    }
    
    .date-location {
        flex-direction: column;
        gap: 15px;
    }
    
    /* 章节标题 */
    .section-header h2 {
        font-size: 32px;
    }
    
    /* 内容部分 */
    .intro-features {
        grid-template-columns: 1fr;
    }
    
    /* 日程亮点 */
    .tab-nav {
        flex-wrap: wrap;
    }
    
    .tab-btn {
        width: calc(50% - 5px);
        padding: 10px;
        font-size: 14px;
    }
    
    .agenda-item {
        flex-direction: column;
        gap: 15px;
    }
    
    .agenda-time {
        align-self: flex-start;
    }
    
    /* 演讲嘉宾 */
    .speakers-grid {
        grid-template-columns: repeat(auto-fill, minmax(100%, 1fr));
    }
    
    .speaker-card {
        max-width: 320px;
        margin: 0 auto;
    }
    
    /* 参展企业 */
    .exhibitors-grid {
        grid-template-columns: 1fr;
    }
    
    .exhibitor-card {
        max-width: 350px;
        margin: 0 auto;
    }
    
    /* 会议酒店 */
    .hotels-grid {
        grid-template-columns: 1fr;
    }
    
    .hotel-card {
        max-width: 350px;
        margin: 0 auto;
    }
    
    /* 大会资讯 */
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .news-card {
        max-width: 350px;
        margin: 0 auto;
    }
    
    /* 展览信息 */
    .exhibition-gallery {
        grid-template-columns: 1fr;
    }
    
    /* 赞助商 */
    .sponsors-grid.diamond .sponsor-logo,
    .sponsors-grid.gold .sponsor-logo,
    .sponsors-grid.support .sponsor-logo {
        flex: 0 0 100%;
    }
    
    /* 参会注册 */
    .countdown {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .countdown-item {
        min-width: calc(50% - 10px);
        margin-bottom: 10px;
    }
    
    /* 联系我们 */
    .contact-content {
        flex-direction: column;
    }
    
    /* 页脚 */
    .footer-bottom {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .footer-bottom-links {
        justify-content: center;
    }
}

/* 小型移动设备 (最大480px) */
@media screen and (max-width: 480px) {
    body {
        font-size: 14px;
    }
    
    /* 轮播图 */
    .banner-slider {
        height: 350px;
    }
    
    .slide-content h2 {
        font-size: 28px;
    }
    
    .slide-content p {
        font-size: 14px;
    }
    
    .cta-button {
        padding: 10px 20px;
        font-size: 14px;
    }
    
    /* 章节标题 */
    .section-header h2 {
        font-size: 28px;
    }
    
    /* 内容部分 */
    .intro-section,
    .agenda-highlights,
    .speakers-section,
    .exhibition-section,
    .exhibitors-section,
    .venue-section,
    .hotels-section,
    .news-section,
    .sponsors-section,
    .contact-section {
        padding: 50px 0;
    }
    
    /* 日程亮点 */
    .tab-content {
        padding: 20px 15px;
    }
    
    /* 新闻卡片 */
    .news-date {
        padding: 6px;
        min-width: 50px;
    }
    
    .news-date .day {
        font-size: 19px;
    }
    
    .news-date .month {
        font-size: 12px;
    }
    
    .news-info h3 {
        font-size: 19px;
    }
    
    /* 联系我们 */
    .contact-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .contact-icon {
        width: 50px;
        height: 50px;
    }
}

/* 打印样式 */
@media print {
    .top-bar,
    .site-header,
    .banner-slider,
    .registration-section,
    .contact-form,
    .site-footer,
    .back-to-top {
        display: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
        color: #000;
        background: #fff;
    }
    
    .container {
        width: 100%;
        max-width: 100%;
        padding: 0;
        margin: 0;
    }
    
    h1, h2, h3, h4, h5, h6 {
        page-break-after: avoid;
        page-break-inside: avoid;
    }
    
    img {
        max-width: 100% !important;
        page-break-inside: avoid;
    }
    
    .section-header {
        margin-bottom: 20px;
    }
    
    .section-header h2 {
        font-size: 18pt;
    }
    
    .intro-content,
    .exhibition-content,
    .venue-content,
    .contact-content {
        display: block;
    }
    
    .intro-image,
    .exhibition-gallery,
    .venue-image {
        margin-top: 20px;
        max-width: 50%;
    }
    
    .agenda-item,
    .speaker-card,
    .sponsor-logo {
        page-break-inside: avoid;
    }
}