/* 平板设备 (768px - 1024px) */
@media screen and (max-width: 1024px) {
    .container {
        padding: 0 30px;
    }

    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-qrcodes .qrcode-list {
        justify-content: center;
    }

    .slide-content h1 {
        font-size: 40px;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }

    .chain-flow {
        flex-wrap: wrap;
        justify-content: center;
    }

    .chain-arrow {
        display: none;
    }

    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 手机设备 (< 768px) */
@media screen and (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .container {
        padding: 0 15px;
    }

    /* Header */
    .header .container {
        height: 60px;
    }

    .logo img {
        height: 40px;
    }

    /* 移动导航 */
    .nav {
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        height: calc(100vh - 60px);
        background-color: #fff;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        transform: translateX(-100%);
        opacity: 0;
        visibility: hidden;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .nav.active {
        transform: translateX(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        padding: 20px;
        gap: 0;
    }

    .nav-list li {
        border-bottom: 1px solid var(--border-color);
    }

    .nav-list a {
        display: block;
        padding: 18px 0;
        font-size: 16px;
    }

    /* 汉堡菜单按钮 */
    .menu-toggle {
        display: flex;
    }

    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }

    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
        transform: translateX(-20px);
    }

    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    /* Banner */
    .banner {
        height: 50vh;
        min-height: 300px;
    }

    .slide-content {
        width: 95%;
    }

    .slide-content h1 {
        font-size: 28px;
        margin-bottom: 15px;
    }

    .slide-content p {
        font-size: 16px;
        margin-bottom: 20px;
    }

    .slide-content .btn {
        padding: 12px 25px;
        font-size: 14px;
    }

    /* Sections */
    section {
        padding: 50px 0;
    }

    section h2 {
        font-size: 26px;
        margin-bottom: 30px;
    }

    .section-subtitle {
        margin-top: -30px;
        margin-bottom: 40px;
        font-size: 15px;
    }

    /* Stats */
    .stats-section {
        padding: 40px 0;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }

    .stat-number {
        font-size: 48px;
    }

    .stat-unit {
        font-size: 16px;
    }

    .stat-label {
        font-size: 14px;
    }

    /* Chain */
    .chain-flow {
        flex-direction: column;
        gap: 10px;
    }

    .chain-item {
        width: 100%;
        max-width: 300px;
        padding: 20px;
    }

    .chain-arrow {
        display: none;
    }

    /* Gallery */
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

    .gallery-overlay {
        transform: translateY(0);
        background: linear-gradient(transparent 30%, rgba(0,0,0,0.6));
    }

    /* Intro */
    .intro-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .intro-text {
        order: 2;
    }

    .intro-image {
        order: 1;
    }

    .intro-text p {
        font-size: 15px;
    }

    /* Services */
    .services-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .service-item {
        padding: 25px 20px;
    }

    .service-item img {
        width: 60px;
        height: 60px;
    }

    .service-item h3 {
        font-size: 18px;
    }

    .service-item p {
        font-size: 14px;
    }

    /* Page Banner */
    .page-banner {
        height: 200px;
    }

    .page-banner-content h1 {
        font-size: 28px;
    }

    .page-banner-content p {
        font-size: 14px;
    }

    /* Sustainability Hero */
    .sustainability-hero {
        height: 200px;
    }

    .sustainability-hero h1 {
        font-size: 28px;
    }

    .sustainability-hero p {
        font-size: 14px;
    }

    /* About */
    .about-content {
        grid-template-columns: 1fr;
    }

    .about-text {
        order: 2;
    }

    .about-image {
        order: 1;
    }

    /* Timeline */
    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        padding-right: 0;
        padding-left: 50px;
    }

    .timeline-item:nth-child(even) {
        padding-left: 50px;
    }

    .timeline-item::before {
        left: 20px;
    }

    .timeline-date {
        position: relative;
        left: auto;
        right: auto;
        margin-bottom: 10px;
    }

    .timeline-item:nth-child(odd) .timeline-date,
    .timeline-item:nth-child(even) .timeline-date {
        left: auto;
        right: auto;
    }

    .timeline-content {
        width: 100%;
    }

    .timeline-item:nth-child(odd) .timeline-content,
    .timeline-item:nth-child(even) .timeline-content {
        margin-left: 0;
        margin-right: 0;
    }

    /* Culture */
    .culture-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .culture-item {
        padding: 30px 20px;
    }

    /* Service Detail */
    .service-detail-item {
        grid-template-columns: 1fr;
    }

    .service-detail-item.reverse {
        direction: ltr;
    }

    /* Coal Chain */
    .coal-chain-flow {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .coal-step::after {
        content: '↓';
        right: auto;
        left: 50%;
        top: auto;
        bottom: -20px;
        transform: translateX(-50%);
    }

    /* Park Overview */
    .park-overview-content {
        grid-template-columns: 1fr;
    }

    .park-overview-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .park-stat-num {
        font-size: 36px;
    }

    /* Park Plan */
    .park-plan-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Facilities */
    .facilities-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Smart */
    .smart-grid {
        grid-template-columns: 1fr;
    }

    /* News Filter */
    .news-filter {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }

    .filter-btn {
        padding: 8px 18px;
        font-size: 13px;
    }

    /* News List */
    .news-list-item {
        grid-template-columns: 1fr;
    }

    .news-list-image img {
        min-height: 200px;
        max-height: 250px;
    }

    .pagination {
        flex-wrap: wrap;
    }

    /* Contact */
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .map-container {
        height: 300px;
    }

    /* News Grid */
    .news-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .news-item img {
        height: 180px;
    }

    .news-content {
        padding: 15px;
    }

    .news-content h3 {
        font-size: 16px;
    }

    .news-content p {
        font-size: 13px;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    /* CTA */
    .contact-cta {
        padding: 40px 15px;
    }

    .contact-cta h2 {
        font-size: 24px;
    }

    .contact-cta p {
        font-size: 16px;
    }

    /* Footer */
    .footer {
        padding: 40px 0 20px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
        text-align: center;
    }

    .footer-col h4 {
        font-size: 16px;
        margin-bottom: 15px;
    }

    .footer-col ul {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px 20px;
    }

    .footer-col li {
        margin-bottom: 0;
    }

    .footer-col a {
        font-size: 14px;
    }

    .footer-qrcodes .qrcode-list {
        justify-content: center;
    }

    .footer-bottom {
        font-size: 12px;
    }

    /* 返回顶部按钮 */
    .back-to-top {
        width: 45px;
        height: 45px;
        bottom: 20px;
        right: 20px;
        font-size: 20px;
    }
}

/* 小屏手机 (< 480px) */
@media screen and (max-width: 480px) {
    .slide-content h1 {
        font-size: 24px;
    }

    .slide-content p {
        font-size: 14px;
    }

    .qrcode-item img {
        width: 80px;
        height: 80px;
    }

    .qrcode-item span {
        font-size: 12px;
    }

    section h2 {
        font-size: 22px;
    }

    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }

    .service-item {
        padding: 20px 15px;
    }

    .news-item img {
        height: 160px;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .stat-number {
        font-size: 40px;
    }

    .gallery-grid {
        grid-template-columns: 1fr;
    }
}

/* 超小屏 (< 320px) */
@media screen and (max-width: 320px) {
    .slide-content h1 {
        font-size: 20px;
    }

    .slide-content p {
        font-size: 13px;
    }

    section h2 {
        font-size: 20px;
    }
}

/* 横屏模式 */
@media screen and (max-height: 500px) and (orientation: landscape) {
    .banner {
        height: 100vh;
    }

    .slide-content h1 {
        font-size: 32px;
    }
}

/* 高DPI屏幕 */
@media screen and (-webkit-min-device-pixel-ratio: 2), screen and (min-resolution: 192dpi) {
    img {
        image-rendering: -webkit-optimize-contrast;
    }
}

/* 打印样式 */
@media print {
    .header,
    .menu-toggle,
    .back-to-top,
    .contact-cta {
        display: none;
    }

    .banner {
        height: auto;
    }

    section {
        padding: 20px 0;
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .service-item:hover,
    .news-item:hover {
        transform: none;
    }

    .btn:hover {
        transform: none;
    }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
    /* 可在此处添加暗色模式样式 */
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}