/* 
 * 畅游大美中国 - 主样式文件
 * 文旅风格设计，支持IE11兼容性
 */

/* 重置样式和基础设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
    overflow-x: hidden;
}

/* 容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 通用标题样式 */
.section-title {
    font-size: 2.5rem;
    font-weight: bold;
    line-height: 1.4;
    text-align: center;
    margin-bottom: 0rem;
    color: #1E88E5;
    position: relative;
    padding-top: 45px;
}

/* .section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, #1E88E5, #42A5F5);
    margin: 10px auto;
    border-radius: 2px;
} */

.section-subtitle {
    font-size: 1.2rem;
    text-align: center;
    color: #fff;
    margin-bottom: 3rem;
    font-style: italic;
}
.lmta .section-subtitle {
    color: #1E88E5;
}

/* Banner区域样式 */
.banner-section {
    width: 100%;
    height: auto;
    background: none;
    display: block;
    position: relative;
    color: white;
    text-align: center;
}

.banner-section img {
    width: 100%;
    height: auto;
    display: block;
}

.banner-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    max-width: 800px;
    padding: 0 20px;
    display: none;
}

.banner-title {
    font-size: 4rem;
    font-weight: bold;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    letter-spacing: 2px;
}

.banner-subtitle {
    font-size: 1.5rem;
    margin-bottom: 3rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
    opacity: 0.9;
}

/* 滚动指示器动画 */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 30px;
    height: 30px;
    border: 2px solid white;
    border-top: none;
    border-left: none;
    transform: rotate(45deg);
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateX(-50%) translateY(0);
    }

    40% {
        transform: translateX(-50%) translateY(-10px);
    }

    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

.lmtb {
    background: url("../images/lmt_b.png") no-repeat center top;
    height: 190px;
}
.lmta {
    background: url("../images/lmt_a.png") no-repeat center top;
    height: 190px;
}

/* 活动概况区样式 */
.overview-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #1565C0 0%, #1E88E5 100%);
    background-image:
        url('../images/overview-bg.svg'),
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        linear-gradient(135deg, #1565C0 0%, #1E88E5 100%);
    background-size: cover, auto, auto, auto;
    background-position: center, center, center, center;
    background-repeat: no-repeat, no-repeat, no-repeat, no-repeat;
    margin-top: 0;
    color: white;
    position: relative;
}

.overview-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="50" cy="10" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="10" cy="60" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="90" cy="40" r="0.5" fill="rgba(255,255,255,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
    pointer-events: none;
}

.overview-content {
    display: block;
    text-align: center;
    position: relative;
    z-index: 1;
}

.overview-text {
    max-width: 900px;
    margin: 0 auto;
}

.overview-section .section-title {
    color: white;
    font-size: 3rem;
    line-height: 1.4;
    margin-bottom: 0rem;
    padding-top: 45px;
}

.overview-section .section-subtitle {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.3rem;
    margin-bottom: 3rem;
}

.overview-description p {
    font-size: 1.2rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: rgba(255, 255, 255, 0.9);
    text-align: left;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
   
}

/* Tab分类展示区样式 */
.category-section {
    padding: 80px 0;
    background: #fff;
}

.tab-navigation {
    display: flex;
    justify-content: center;
    margin-bottom: 50px;
    border-bottom: 2px solid #f0f0f0;
}

.tab-btn {
    background: none;
    border: none;
    padding: 25px 50px;
    margin: 0 10px;
    cursor: pointer;
    font-size: 1.3rem;
    color: #666;
    transition: all 0.3s ease;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    border-radius: 15px 15px 0 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.tab-btn:hover {
    color: #1E88E5;
    background: rgba(30, 136, 229, 0.08);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(30, 136, 229, 0.2);
}

.tab-btn.active {
    color: #1E88E5;
    background: rgba(30, 136, 229, 0.15);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(30, 136, 229, 0.3);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #1E88E5, #42A5F5);
    border-radius: 2px 2px 0 0;
}

.tab-text {
    font-weight: bold;
    font-size: 1.4rem;
    letter-spacing: 1px;
}

.tab-english {
    font-size: 1rem;
    opacity: 0.8;
    font-style: italic;
    font-weight: normal;
}

/* Tab内容区样式 */
.tab-content {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.content-card {
    background: #fff;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
}

.content-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.card-image {
    position: relative;
    overflow: hidden;
    height: 250px;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(1.1);
}

.content-card:hover .card-image img {
    transform: scale(1.1);
}

.card-content {
    padding: 25px;
}

.card-title {
    font-size: 1.5rem;
    font-weight: bold;
    color: #1E88E5;
    margin-bottom: 15px;
    text-align: center;
}

.card-description {
    font-size: 1rem;
    line-height: 1.7;
    color: #666;
    text-align: justify;
}

/* 宣传推介区样式 */
.promotion-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #1565C0 0%, #1E88E5 100%);
    background-image:
        url('../images/promotion-bg.svg'),
        linear-gradient(135deg, #1565C0 0%, #1E88E5 100%);
    background-size: cover, auto;
    background-position: center, center;
    background-repeat: no-repeat, no-repeat;
    color: white;
}

.promotion-section .section-title {
    color: white;
}

.promotion-section .section-title::after {
    background: linear-gradient(90deg, #42A5F5, #1E88E5);
}

.promotion-content {
    display: flex;
    align-items: stretch;
    gap: 0;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
}

/* 新增：视频关闭按钮（仅限#promotion作用域） */
.promotion-section .video-close-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(0,0,0,0.4);
    color: #fff;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 16px;
    cursor: pointer;
    display: none; /* 默认隐藏 */
    align-items: center;
    justify-content: center;
    font-size: 18px;
    line-height: 1;
    z-index: 2;
}
.promotion-section .video-container.is-playing .video-close-btn {
    display: flex; /* 播放时显示关闭按钮 */
}
.promotion-section .video-close-btn:hover {
    background: rgba(0,0,0,0.6);
}

/* 宣传推介区：页签内容显示控制与布局保持 */
.promotion-content .tab-content {
    display: none;
    animation: fadeIn 0.5s ease-in-out; /* 与 #category 一致的淡入动画 */
}
.promotion-content .tab-content.active {
    display: flex; /* 桌面端保持视频与描述并排布局 */
}

/* 保持面板内元素原有样式 */
.video-container {
    flex: 1.2;
    position: relative;
    border-radius: 0;
    overflow: hidden;
    box-shadow: none;
}

.promotion-video {
    width: 100%;
    height: 100%;
    min-height: 400px;
    object-fit: cover;
    display: block;
    aspect-ratio: 16/9;
}

.promotion-description {
    flex: 1;
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
}

.promotion-description h4 {
    font-size: 2rem;
    margin-bottom: 25px;
    color: #fff;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    font-weight: bold;
    text-align: center;
    letter-spacing: 1px;
}

.promotion-description p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 20px;
    opacity: 0.95;
    text-align: justify;
    color: rgba(255, 255, 255, 0.95);
    text-indent: 2em;
}

/* 页脚样式 */
.footer-section {
    background: linear-gradient(135deg, #1565C0 0%, #1E88E5 100%);
    color: white;
    padding: 40px 0;
    text-align: center;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.copyright-info {
    font-size: 0.9rem;
    line-height: 1.6;
    opacity: 0.8;
}

.copyright-info p {
    margin-bottom: 10px;
}

/* 图片懒加载效果 */
.lazy-load {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lazy-load.loaded {
    opacity: 1;
}

/* 通用动画类 */
.fade-in {
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 固定导航条样式 */
.sticky-navigation {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgb(25, 144, 200);
    background: url(data:image/svg+xml;base64,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);
    background: -moz-linear-gradient(left, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    background: -webkit-gradient(linear, left top, right top, color-stop(0%, rgba(25, 144, 200, 1)), color-stop(20%, rgba(102, 158, 135, 1)), color-stop(50%, rgba(18, 86, 209, 1)), color-stop(80%, rgba(0, 136, 210, 1)), color-stop(100%, rgba(125, 185, 232, 1)));
    background: -webkit-linear-gradient(left, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    background: -o-linear-gradient(left, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    background: -ms-linear-gradient(left, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    background: linear-gradient(to right, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#1990c8', endColorstr='#7db9e8', GradientType=1);

    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.sticky-navigation .container {
    padding: 0 20px;
}

.nav-menu {
    display: flex;
    justify-content: center;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 0;
}

.nav-item {
    flex: 1;
    max-width: 300px;
}

.nav-link {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 25px;
    text-decoration: none;
    color: #fff;
    transition: all 0.3s ease;
    position: relative;
    border-right: 1px solid rgba(0, 0, 0, 0.1);
    min-height: 50px;
}

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

.nav-link:hover {
    background: rgba(0, 0, 0, 0.05);
    color: #fff;
    transform: translateY(-1px);
}

.nav-link.active {
    background: rgba(95, 172, 248, 0.4);
    color: #fff;
    box-shadow: inset 0 -3px 0 #1976D2;
}

.nav-text {
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.3px;
}

/* 导航条滚动时的样式变化 */
.sticky-navigation.scrolled {
    background: rgb(25, 144, 200);
    background: url(data:image/svg+xml;base64,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);
    background: -moz-linear-gradient(left, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    background: -webkit-gradient(linear, left top, right top, color-stop(0%, rgba(25, 144, 200, 1)), color-stop(20%, rgba(102, 158, 135, 1)), color-stop(50%, rgba(18, 86, 209, 1)), color-stop(80%, rgba(0, 136, 210, 1)), color-stop(100%, rgba(125, 185, 232, 1)));
    background: -webkit-linear-gradient(left, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    background: -o-linear-gradient(left, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    background: -ms-linear-gradient(left, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    background: linear-gradient(to right, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#1990c8', endColorstr='#7db9e8', GradientType=1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    border-bottom: 1px solid rgba(0, 0, 0, 0.15);
}

.sticky-navigation.scrolled .nav-link {
    padding: 10px 20px;
    min-height: 45px;
}

.sticky-navigation.scrolled .nav-text {
    font-size: 0.95rem;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #1E88E5, #42A5F5);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #42A5F5, #1E88E5);
}

/* 轮播容器与项 */
.promo-carousel {
    position: relative;
    width: 100%;
}
.promo-carousel .carousel-item {
    display: none;
    animation: fadeIn 0.5s ease-in-out; /* 与 #category 一致的淡入 */
}
.promo-carousel .carousel-item.active {
    display: flex; /* 与 .promotion-content 保持并排布局 */
}

/* 控件与指示器 */
.promo-carousel .carousel-controls {
    position: absolute;
    inset: 0;
    pointer-events: none;
}
.promo-carousel .prev-btn,
.promo-carousel .next-btn {
    pointer-events: auto;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255,255,255,0.15);
    color: #fff;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 20px;
    cursor: pointer;
    transition: background 0.2s ease;
}
.promo-carousel .prev-btn { left: 10px; }
.promo-carousel .next-btn { right: 10px; }
.promo-carousel .prev-btn:hover,
.promo-carousel .next-btn:hover {
    background: rgba(255,255,255,0.3);
}
.promo-carousel .prev-btn[disabled],
.promo-carousel .next-btn[disabled] {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 指示点 */
.promo-carousel .carousel-indicators {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
}
.promo-carousel .carousel-indicators button {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,0.5);
    cursor: pointer;
}
.promo-carousel .carousel-indicators button.active {
    background: #fff;
}

/* 播放按钮覆盖层 */
.play-overlay {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    background: rgba(0,0,0,0.4);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 56px;
    height: 56px;
    font-size: 1.2rem;
    cursor: pointer;
    display: none; /* 默认不显示，悬停时显示 */
}
.video-container {
    position: relative; /* 为 overlay 定位 */
}
.video-container:hover .play-overlay {
    display: block;
}

/* 宣传推介（#promotion）下的页签头与按钮样式，独立作用域 */
.promotion-section .tab-navigation {
    display: flex;
    justify-content: center;
    margin-bottom: 50px;
    border-bottom: 2px solid #f0f0f0;
}

.promotion-section .tab-btn {
    background: none;
    border: none;
    padding: 25px 50px;
    margin: 0 10px;
    cursor: pointer;
    font-size: 1.3rem;
    color: #666;
    transition: all 0.3s ease;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    border-radius: 15px 15px 0 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1); background: rgba(255, 255, 255, 1);
}

.promotion-section .tab-btn:hover {
    color: #1E88E5;
    background: rgba(255, 255, 255, 1);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(30, 136, 229, 0.2);
}

.promotion-section .tab-btn.active {
    color: #1E88E5;
    background: rgba(255, 255, 255, 1);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(30, 136, 229, 0.3);
}

.promotion-section .tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #1E88E5, #42A5F5);
    border-radius: 2px 2px 0 0;
}

.promotion-section .tab-text {
    font-weight: bold;
    font-size: 1.4rem;
    letter-spacing: 1px;
}

.promotion-section .tab-english {
    font-size: 1rem;
    opacity: 0.8;
    font-style: italic;
    font-weight: normal;
}

/* 页脚样式 */
.footer-section {
    background: linear-gradient(135deg, #1565C0 0%, #1E88E5 100%);
    color: white;
    padding: 40px 0;
    text-align: center;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.copyright-info {
    font-size: 0.9rem;
    line-height: 1.6;
    opacity: 0.8;
}

.copyright-info p {
    margin-bottom: 10px;
}

/* 图片懒加载效果 */
.lazy-load {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lazy-load.loaded {
    opacity: 1;
}

/* 通用动画类 */
.fade-in {
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 固定导航条样式 */
.sticky-navigation {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgb(25, 144, 200);
    background: url(data:image/svg+xml;base64,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);
    background: -moz-linear-gradient(left, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    background: -webkit-gradient(linear, left top, right top, color-stop(0%, rgba(25, 144, 200, 1)), color-stop(20%, rgba(102, 158, 135, 1)), color-stop(50%, rgba(18, 86, 209, 1)), color-stop(80%, rgba(0, 136, 210, 1)), color-stop(100%, rgba(125, 185, 232, 1)));
    background: -webkit-linear-gradient(left, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    background: -o-linear-gradient(left, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    background: -ms-linear-gradient(left, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    background: linear-gradient(to right, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#1990c8', endColorstr='#7db9e8', GradientType=1);

    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.sticky-navigation .container {
    padding: 0 20px;
}

.nav-menu {
    display: flex;
    justify-content: center;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 0;
}

.nav-item {
    flex: 1;
    max-width: 300px;
}

.nav-link {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 25px;
    text-decoration: none;
    color: #fff;
    transition: all 0.3s ease;
    position: relative;
    border-right: 1px solid rgba(0, 0, 0, 0.1);
    min-height: 50px;
}

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

.nav-link:hover {
    background: rgba(0, 0, 0, 0.05);
    color: #fff;
    transform: translateY(-1px);
}

.nav-link.active {
    background: rgba(95, 172, 248, 0.4);
    color: #fff;
    box-shadow: inset 0 -3px 0 #1976D2;
}

.nav-text {
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.3px;
}

/* 导航条滚动时的样式变化 */
.sticky-navigation.scrolled {
    background: rgb(25, 144, 200);
    background: url(data:image/svg+xml;base64,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);
    background: -moz-linear-gradient(left, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    background: -webkit-gradient(linear, left top, right top, color-stop(0%, rgba(25, 144, 200, 1)), color-stop(20%, rgba(102, 158, 135, 1)), color-stop(50%, rgba(18, 86, 209, 1)), color-stop(80%, rgba(0, 136, 210, 1)), color-stop(100%, rgba(125, 185, 232, 1)));
    background: -webkit-linear-gradient(left, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    background: -o-linear-gradient(left, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    background: -ms-linear-gradient(left, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    background: linear-gradient(to right, rgba(25, 144, 200, 1) 0%, rgba(102, 158, 135, 1) 20%, rgba(18, 86, 209, 1) 50%, rgba(0, 136, 210, 1) 80%, rgba(125, 185, 232, 1) 100%);
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#1990c8', endColorstr='#7db9e8', GradientType=1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    border-bottom: 1px solid rgba(0, 0, 0, 0.15);
}

.sticky-navigation.scrolled .nav-link {
    padding: 10px 20px;
    min-height: 45px;
}

.sticky-navigation.scrolled .nav-text {
    font-size: 0.95rem;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #1E88E5, #42A5F5);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #42A5F5, #1E88E5);
}

/* 轮播容器与项 */
.promo-carousel {
    position: relative;
    width: 100%;
}
.promo-carousel .carousel-item {
    display: none;
    animation: fadeIn 0.5s ease-in-out; /* 与 #category 一致的淡入 */
}
.promo-carousel .carousel-item.active {
    display: flex; /* 与 .promotion-content 保持并排布局 */
}

/* 控件与指示器 */
.promo-carousel .carousel-controls {
    position: absolute;
    inset: 0;
    pointer-events: none;
}
.promo-carousel .prev-btn,
.promo-carousel .next-btn {
    pointer-events: auto;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255,255,255,0.15);
    color: #fff;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 20px;
    cursor: pointer;
    transition: background 0.2s ease;
}
.promo-carousel .prev-btn { left: 10px; }
.promo-carousel .next-btn { right: 10px; }
.promo-carousel .prev-btn:hover,
.promo-carousel .next-btn:hover {
    background: rgba(255,255,255,0.3);
}
.promo-carousel .prev-btn[disabled],
.promo-carousel .next-btn[disabled] {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 指示点 */
.promo-carousel .carousel-indicators {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
}
.promo-carousel .carousel-indicators button {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,0.5);
    cursor: pointer;
}
.promo-carousel .carousel-indicators button.active {
    background: #fff;
}

/* 播放按钮覆盖层 */
.play-overlay {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    background: rgba(0,0,0,0.4);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 56px;
    height: 56px;
    font-size: 1.2rem;
    cursor: pointer;
    display: none; /* 默认不显示，悬停时显示 */
}
.video-container {
    position: relative; /* 为 overlay 定位 */
}
.video-container:hover .play-overlay {
    display: block;
}
a {
    text-decoration: none;
}
#promotion .video-container.is-playing .play-overlay {
    opacity: 0 !important;
    pointer-events: none !important;
    visibility: hidden;
}
#promotion .video-container.is-playing:hover .play-overlay {
    opacity: 0 !important;
    pointer-events: none !important;
    visibility: hidden;
}