/* ========================= 全局基础样式 ========================= */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
    margin: 0;
    padding: 0;
}

/* ========================= 头部导航样式 ========================= */
header {
    /* background: rgba(255, 255, 255, 0.98);*/
    background-color:rgb(245 245 245/var(--tw-bg-opacity,1));
    backdrop-filter: blur(10px);
    padding: 0;
    /* position: fixed;*/
    position: relative;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 1px 10px rgba(0, 0, 0, 0.05);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
  /*  padding: 0.5rem 2rem;*/
    min-height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

/* 桌面端 Logo 图片样式 */
.logo-image {
    height: 54px;
    width: auto;
    max-width: 280px;
    object-fit: contain;
    transition: all 0.3s ease;
    margin-right: 28%;
}

.logo-triangle {
    width: 0;
    height: 0;
    border-left: 20px solid transparent;
    border-right: 20px solid transparent;
    border-bottom: 35px solid #00b894;
    position: relative;
}

    .logo-triangle::after {
        content: '';
        position: absolute;
        top: 6px;
        left: -16px;
        width: 0;
        height: 0;
        border-left: 16px solid transparent;
        border-right: 16px solid transparent;
        border-bottom: 28px solid white;
    }

.logo-text {
    display: flex;
    flex-direction: column;
}

    .logo-text .chinese {
        font-size: 16px;
        font-weight: 600;
        color: #2d3436;
        line-height: 1.2;
    }

    .logo-text .english {
        font-size: 9px;
        color: #636e72;
        margin-top: 1px;
        letter-spacing: 0.3px;
        line-height: 1.1;
    }

/* ========================= 桌面端导航菜单 ========================= */
.desktop-nav {
    display: flex;
}

    .desktop-nav ul {
        display: flex;
        list-style: none;
       /* gap: 0.5rem;*/
        align-items: center;
    }


   

    .desktop-nav ul li ul li:hover{
        background-color:red;
    }

    .desktop-nav a {
        text-decoration: none;
        color: #333;
        font-weight: 500;
        font-size: 15px;
        /*padding: 0.5rem 0;*/
        transition: all 0.3s ease;
        position: relative;
    }

        .desktop-nav a:hover {
            color: #00b894;
        }

        .desktop-nav a.active {
            color: #00b894;
        }

            .desktop-nav a.active::after {
                content: '';
                position: absolute;
                bottom: -5px;
                left: 0;
                right: 0;
                height: 2px;
                background: #00b894;
                border-radius: 1px;
            }

/* ========================= 移动端菜单按钮 ========================= */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: background-color 0.2s ease;
}

    .mobile-menu-btn:hover {
        background: rgba(0, 0, 0, 0.05);
    }

.hamburger {
    width: 24px;
    height: 24px;
    position: relative;
    transform: rotate(0deg);
    transition: 0.3s ease-in-out;
    right:20px;
    top:-10px;
}

    .hamburger span {
        display: block;
        position: absolute;
        height: 2px;
        width: 100%;
        background: #333;
        border-radius: 1px;
        opacity: 1;
        left: 0;
        transform: rotate(0deg);
        transition: 0.25s ease-in-out;
    }

        .hamburger span:nth-child(1) {
            top: 6px;
        }

        .hamburger span:nth-child(2) {
            top: 11px;
        }

        .hamburger span:nth-child(3) {
            top: 16px;
        }

.mobile-menu-btn.active .hamburger span:nth-child(1) {
    top: 11px;
    transform: rotate(135deg);
}

.mobile-menu-btn.active .hamburger span:nth-child(2) {
    opacity: 0;
    left: -30px;
}

.mobile-menu-btn.active .hamburger span:nth-child(3) {
    top: 11px;
    transform: rotate(-135deg);
}

/* ========================= 移动端导航菜单 ========================= */
.mobile-nav {
    display: none;
    position: fixed;
    top: 61px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    z-index: 1001;
    pointer-events: none;
}

    .mobile-nav.active {
        max-height: 100vh;
        pointer-events: auto;
    }

.mobile-nav-content {
    padding: 1rem 0;
}

.mobile-nav-links {
    list-style: none;
    padding: 0;
}

    .mobile-nav-links li {
        border-bottom: 1px solid rgba(0, 0, 0, 0.03);
    }

        .mobile-nav-links li:last-child {
            border-bottom: none;
        }

    .mobile-nav-links a {
        display: block;
        padding: 0.9rem 2rem;
        color: #333;
        text-decoration: none;
        font-size: 16px;
        font-weight: 500;
        transition: all 0.2s ease;
    }

        .mobile-nav-links a:hover,
        .mobile-nav-links a.active {
            background: rgba(0, 184, 148, 0.05);
            color: #00b894;
        }

/* ========================= 主Banner区域 ========================= */
.hero {
    background: url('images/bg.png') no-repeat center center;
    background-size: cover;
/*    min-height: 85vh;*/
    display: flex;
    align-items: center;
 /*   padding-top: 80px;*/
    position: relative;
    overflow: hidden;
}

/*视频全屏播放*/


.Video-area {
    width: 100%;
    height: calc(80vh - 100px);
 /*   min-height: 780px;*/
    object-fit: cover;
    vertical-align:middle;
}

.My-Info {
    width:100%;
    padding: 2rem 0rem;
    text-align: center;
    height: 500px;
    line-height:50px;
    margin-top:50px;
}
.cta-button {
    padding:  0.5rem;
    line-height:40px;
}


.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6rem;
    align-items: center;
    position: relative;
}

.hero-content h1 {
    font-size: 3.2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: #2d3436;
    line-height: 1.2;
}

    .hero-content h1 .highlight {
        color: #00b894;
    }

.hero-content p {
    font-size: 1.1rem;
/*    color: #fff;*/
    margin-bottom: 3rem;
    line-height: 1.8;
}

.cta-button {
    background: #00b894;
    color: white;
    padding: 0.5rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

    .cta-button:hover {
        background: #00a085;
        transform: translateY(-2px);
    }

.hero-image {
    position: relative;
    text-align: center;
}



.hero-video-container {
    position: relative;
    width: 100%;
    height: 350px;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.hero-video {
    width: 100%;
/*    height: calc(100vh - 80px);*/
    max-height: 780px;
    /*object-fit: cover;*/
}

.hero-video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.hero-video-container:hover .hero-video-overlay {
    opacity: 0.8;
}

.hero-play-button {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

    .hero-play-button:hover {
        background: white;
        transform: scale(1.1);
    }

    .hero-play-button::after {
        content: '';
        width: 0;
        height: 0;
        border-left: 20px solid #00b894;
        border-top: 12px solid transparent;
        border-bottom: 12px solid transparent;
        margin-left: 5px;
    }

/* ========================= 统计数据区域 ========================= */
.stats {
    background: white;
    padding: 0;
    margin-top: -30px;
    position: relative;
    z-index: 10;
}

.stats-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 3rem 2rem;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 4rem;
    text-align: center;
}

.stat-item {
    padding: 1rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    color: #00b894;
    margin-bottom: 0.5rem;
    display: block;
}

.stat-label {
    color: #636e72;
    font-size: 1rem;
}

/* ========================= 出版服务区域 ========================= */
.publishing {
    background: white;
    padding: 4rem 0;
}

.publishing-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    color: #2d3436;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: #636e72;
    margin-bottom: 3rem;
}

.category-tabs {
    display: flex;
    justify-content: center;
    gap: 0;
    margin-bottom: 3rem;
    background: #f8f9fa;
    border-radius: 25px;
    padding: 5px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 4rem;
}

.category-tab {
    padding: 1rem 2rem;
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    color: #636e72;
    transition: all 0.3s ease;
    border-radius: 20px;
    flex: 1;
    text-align: center;
    font-weight: 500;
}

    .category-tab.active {
        background: #00b894;
        color: white;
        box-shadow: 0 2px 10px rgba(0, 184, 148, 0.3);
    }

    .category-tab:hover:not(.active) {
        background: rgba(0, 184, 148, 0.1);
        color: #00b894;
    }

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    opacity: 1;
    transition: all 0.5s ease;
}

    .books-grid.fade-out {
        opacity: 0;
        transform: translateY(20px);
    }

    .books-grid.fade-in {
        opacity: 1;
        transform: translateY(0);
    }

.book-item {
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: transparent;
    padding: 0;
}

    .book-item:hover {
        transform: translateY(-10px);
    }

.book-cover {
    margin: 0 auto 1.5rem;
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
}

.book-3d {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s ease;
}

.book-title {
    font-size: 1rem;
    color: #2d3436;
    font-weight: 600;
    line-height: 1.4;
    margin-top: 0.5rem;
}

    .book-title a {
    
     text-decoration:none;
     color:#000;
    }

        .book-title a:visited{color:#000;}
        /* ========================= 数字教材样式 ========================= */
        .book-item[data-category="digital"] .book-cover {
            width: 160px;
            height: 220px;
            perspective: 1000px;
        }

.book-item[data-category="digital"]:hover .book-3d {
    transform: rotateY(-15deg) rotateX(5deg);
}

.digital-book-front,
.digital-book-spine,
.digital-book-back {
    position: absolute;
    top: 0;
    left: 0;
    border-radius: 4px;
}

.digital-book-front {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4), inset 0 0 30px rgba(255, 255, 255, 0.1);
    transform: translateZ(6px);
    display: flex;
    flex-direction: column;
    padding: 15px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    overflow: hidden;
    z-index: 3;
}

.digital-book-back {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #5a67d8, #6b46c1);
    transform: translateZ(0px);
    box-shadow: 0 0 25px rgba(0, 0, 0, 0.3);
    border-radius: 4px;
    z-index: 1;
}

.digital-book-spine {
    width: 12px;
    height: 100%;
    background: linear-gradient(to right, rgba(0, 0, 0, 0.4), rgba(102, 126, 234, 0.8), rgba(255, 255, 255, 0.2));
    transform: rotateY(-90deg) translateZ(6px);
    transform-origin: left center;
    border-radius: 0 4px 4px 0;
    z-index: 2;
}

.digital-book-front::before {
    content: '';
    position: absolute;
    top: 10px;
    right: 10px;
    width: 20px;
    height: 20px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    animation: digitalPulse 2s ease-in-out infinite;
}

.digital-book-front::after {
    content: '';
    position: absolute;
    bottom: 15px;
    left: 15px;
    right: 15px;
    height: 2px;
    background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.6), transparent);
    border-radius: 1px;
}

@keyframes digitalPulse {
    0%, 100% {
        opacity: 0.3;
        transform: scale(1);
    }

    50% {
        opacity: 0.8;
        transform: scale(1.2);
    }
}

.digital-title-on-cover {
    color: white;
    font-size: 13px;
    font-weight: bold;
    text-align: center;
    line-height: 1.3;
    margin-top: auto;
    margin-bottom: auto;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    z-index: 10;
    position: relative;
}

.digital-author {
    font-size: 10px;
    color: rgba(255, 255, 255, 0.8);
    margin-top: auto;
    text-align: center;
    font-style: italic;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* 数字教材颜色变化 */
.book-item[data-category="digital"]:nth-child(1) .digital-book-front {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.book-item[data-category="digital"]:nth-child(2) .digital-book-front {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.book-item[data-category="digital"]:nth-child(3) .digital-book-front {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.book-item[data-category="digital"]:nth-child(4) .digital-book-front {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.book-item[data-category="digital"]:nth-child(5) .digital-book-front {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.book-item[data-category="digital"]:nth-child(6) .digital-book-front {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
}

/* ========================= 电子书样式 ========================= */
.book-item[data-category="ebook"] .book-cover {
    width: 180px;
    height: 260px;
    perspective: 1000px;
}

.book-item[data-category="ebook"]:hover .book-3d {
    transform: rotateY(-12deg) rotateX(3deg);
}

.ebook-device-front,
.ebook-device-spine,
.ebook-device-back {
    position: absolute;
    top: 0;
    left: 0;
    border-radius: 8px;
}

.ebook-device-front {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #2d3748 0%, #4a5568 100%);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transform: translateZ(4px);
    display: flex;
    flex-direction: column;
    padding: 8px;
   /* border: 2px solid #4a5568;*/
    z-index: 3;
}

.ebook-device-back {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1a202c, #2d3748);
    transform: translateZ(0px);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    z-index: 1;
}

.ebook-device-spine {
    width: 8px;
    height: 100%;
    background: linear-gradient(to right, rgba(0, 0, 0, 0.5), #4a5568, rgba(255, 255, 255, 0.1));
    transform: rotateY(-90deg) translateZ(4px);
    transform-origin: left center;
    border-radius: 0 8px 8px 0;
    z-index: 2;
}

/* 电子书活力渐变色 */
.book-item[data-category="ebook"]:nth-child(1) .ebook-device-front {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  /*  border: 2px solid #667eea;*/
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.book-item[data-category="ebook"]:nth-child(1) .ebook-device-back {
    background: linear-gradient(135deg, #5a67d8, #6b46c1);
}

.book-item[data-category="ebook"]:nth-child(1) .ebook-device-spine {
    background: linear-gradient(to right, rgba(0, 0, 0, 0.5), #667eea, rgba(255, 255, 255, 0.2));
}

.book-item[data-category="ebook"]:nth-child(1) .ebook-screen {
    background: linear-gradient(135deg, #f7fafc, #e2e8f0);
}

    .book-item[data-category="ebook"]:nth-child(1) .ebook-screen::before {
        background: linear-gradient(to right, #667eea, transparent);
    }

.book-item[data-category="ebook"]:nth-child(1) .ebook-device-front::after {
    background: #667eea;
    box-shadow: 0 0 8px rgba(102, 126, 234, 0.6);
}

/* 第2个电子书 - 粉红炫彩渐变 */
.book-item[data-category="ebook"]:nth-child(2) .ebook-device-front {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
   /* border: 2px solid #f093fb;*/
    box-shadow: 0 10px 30px rgba(240, 147, 251, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.book-item[data-category="ebook"]:nth-child(2) .ebook-device-back {
    background: linear-gradient(135deg, #e879f9, #ec4899);
}

.book-item[data-category="ebook"]:nth-child(2) .ebook-device-spine {
    background: linear-gradient(to right, rgba(0, 0, 0, 0.5), #f093fb, rgba(255, 255, 255, 0.2));
}

.book-item[data-category="ebook"]:nth-child(2) .ebook-screen {
    background: linear-gradient(135deg, #fef7ff, #fce7f3);
}

    .book-item[data-category="ebook"]:nth-child(2) .ebook-screen::before {
        background: linear-gradient(to right, #f093fb, transparent);
    }

.book-item[data-category="ebook"]:nth-child(2) .ebook-device-front::after {
    background: #f093fb;
    box-shadow: 0 0 8px rgba(240, 147, 251, 0.6);
}

/* 第3个电子书 - 青蓝清新渐变 */
.book-item[data-category="ebook"]:nth-child(3) .ebook-device-front {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    border: 2px solid #4facfe;
    box-shadow: 0 10px 30px rgba(79, 172, 254, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.book-item[data-category="ebook"]:nth-child(3) .ebook-device-back {
    background: linear-gradient(135deg, #0ea5e9, #0891b2);
}

.book-item[data-category="ebook"]:nth-child(3) .ebook-device-spine {
    background: linear-gradient(to right, rgba(0, 0, 0, 0.5), #4facfe, rgba(255, 255, 255, 0.2));
}

.book-item[data-category="ebook"]:nth-child(3) .ebook-screen {
    background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
}

    .book-item[data-category="ebook"]:nth-child(3) .ebook-screen::before {
        background: linear-gradient(to right, #4facfe, transparent);
    }

.book-item[data-category="ebook"]:nth-child(3) .ebook-device-front::after {
    background: #4facfe;
    box-shadow: 0 0 8px rgba(79, 172, 254, 0.6);
}

/* 第4个电子书 - 绿色自然渐变 */
.book-item[data-category="ebook"]:nth-child(4) .ebook-device-front {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    border: 2px solid #43e97b;
    box-shadow: 0 10px 30px rgba(67, 233, 123, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.book-item[data-category="ebook"]:nth-child(4) .ebook-device-back {
    background: linear-gradient(135deg, #22c55e, #14b8a6);
}

.book-item[data-category="ebook"]:nth-child(4) .ebook-device-spine {
    background: linear-gradient(to right, rgba(0, 0, 0, 0.5), #43e97b, rgba(255, 255, 255, 0.2));
}

.book-item[data-category="ebook"]:nth-child(4) .ebook-screen {
    background: linear-gradient(135deg, #f0fdf4, #dcfce7);
}

    .book-item[data-category="ebook"]:nth-child(4) .ebook-screen::before {
        background: linear-gradient(to right, #43e97b, transparent);
    }

.book-item[data-category="ebook"]:nth-child(4) .ebook-device-front::after {
    background: #43e97b;
    box-shadow: 0 0 8px rgba(67, 233, 123, 0.6);
}

/* 第5个电子书 - 橙粉暖色渐变 */
.book-item[data-category="ebook"]:nth-child(5) .ebook-device-front {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    border: 2px solid #fa709a;
    box-shadow: 0 10px 30px rgba(250, 112, 154, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.book-item[data-category="ebook"]:nth-child(5) .ebook-device-back {
    background: linear-gradient(135deg, #f472b6, #fbbf24);
}

.book-item[data-category="ebook"]:nth-child(5) .ebook-device-spine {
    background: linear-gradient(to right, rgba(0, 0, 0, 0.5), #fa709a, rgba(255, 255, 255, 0.2));
}

.book-item[data-category="ebook"]:nth-child(5) .ebook-screen {
    background: linear-gradient(135deg, #fffbeb, #fef3c7);
}

    .book-item[data-category="ebook"]:nth-child(5) .ebook-screen::before {
        background: linear-gradient(to right, #fa709a, transparent);
    }

.book-item[data-category="ebook"]:nth-child(5) .ebook-device-front::after {
    background: #fa709a;
    box-shadow: 0 0 8px rgba(250, 112, 154, 0.6);
}

/* 电子书屏幕和内容样式 */
.ebook-screen {
    background: linear-gradient(135deg, #f7fafc, #edf2f7);
    border-radius: 4px;
    flex: 1;
    margin: 4px;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    padding: 12px 8px;
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.1);
}

    .ebook-screen::before {
        content: '';
        position: absolute;
        top: 8px;
        left: 8px;
        right: 8px;
        height: 3px;
        background: linear-gradient(to right, #4299e1, transparent);
        border-radius: 2px;
    }

.ebook-title-on-screen {
    color: #2d3748;
    font-size: 11px;
    font-weight: bold;
    text-align: center;
    line-height: 1.2;
    margin-top: auto;
    margin-bottom: auto;
    z-index: 10;
}

.ebook-author-on-screen {
    font-size: 8px;
    color: #718096;
    margin-top: auto;
    text-align: center;
    font-style: italic;
}

.ebook-device-front::after {
    content: '';
    position: absolute;
    bottom: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: #4299e1;
    border-radius: 2px;
    box-shadow: 0 0 8px rgba(66, 153, 225, 0.5);
}

/* ========================= 音像制品样式 ========================= */
.book-item[data-category="audio"] .book-cover {
    width: 180px;
    height: 180px;
    perspective: 1000px;
}

.book-item[data-category="audio"]:hover .book-3d {
    transform: rotateX(20deg) rotateY(10deg);
}

.cd-disc {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s ease;
}

.cd-front,
.cd-back {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
}

.cd-front {
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.8) 0%, rgba(255, 255, 255, 0.4) 20%, rgba(0, 184, 148, 0.6) 40%, rgba(102, 126, 234, 0.8) 60%, rgba(139, 69, 19, 0.6) 80%, rgba(0, 0, 0, 0.8) 100%);
    transform: translateZ(2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3), inset 0 0 50px rgba(255, 255, 255, 0.2);
    overflow: hidden;
    z-index: 3;
}

.cd-back {
    background: radial-gradient(circle, #2d3748 0%, #4a5568 30%, #2d3748 70%, #1a202c 100%);
    transform: translateZ(0px);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.4);
    z-index: 1;
}

/* 音像制品炫彩渐变色 */
.book-item[data-category="audio"]:nth-child(1) .cd-front {
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.8) 0%, #667eea 30%, #764ba2 60%, rgba(0, 0, 0, 0.8) 100%);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4), inset 0 0 30px rgba(255, 255, 255, 0.2);
}

.book-item[data-category="audio"]:nth-child(2) .cd-front {
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.8) 0%, #f093fb 30%, #f5576c 60%, rgba(0, 0, 0, 0.8) 100%);
    box-shadow: 0 10px 30px rgba(240, 147, 251, 0.4), inset 0 0 30px rgba(255, 255, 255, 0.2);
}

.book-item[data-category="audio"]:nth-child(3) .cd-front {
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.8) 0%, #4facfe 30%, #00f2fe 60%, rgba(0, 0, 0, 0.8) 100%);
    box-shadow: 0 10px 30px rgba(79, 172, 254, 0.4), inset 0 0 30px rgba(255, 255, 255, 0.2);
}

.book-item[data-category="audio"]:nth-child(4) .cd-front {
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.8) 0%, #43e97b 30%, #38f9d7 60%, rgba(0, 0, 0, 0.8) 100%);
    box-shadow: 0 10px 30px rgba(67, 233, 123, 0.4), inset 0 0 30px rgba(255, 255, 255, 0.2);
}

.book-item[data-category="audio"]:nth-child(5) .cd-front {
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.8) 0%, #fa709a 30%, #fee140 60%, rgba(0, 0, 0, 0.8) 100%);
    box-shadow: 0 10px 30px rgba(250, 112, 154, 0.4), inset 0 0 30px rgba(255, 255, 255, 0.2);
}

.book-item[data-category="audio"]:nth-child(6) .cd-front {
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.8) 0%, #a8edea 30%, #fed6e3 60%, rgba(0, 0, 0, 0.8) 100%);
    box-shadow: 0 10px 30px rgba(168, 237, 234, 0.4), inset 0 0 30px rgba(255, 255, 255, 0.2);
}

/* CD通用元素 */
.cd-front::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 24px;
    height: 24px;
    background: radial-gradient(circle, rgba(0, 0, 0, 0.8) 0%, rgba(0, 0, 0, 0.9) 70%, transparent 100%);
    border-radius: 50%;
    box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.2);
    z-index: 12;
}

.cd-front::after {
    content: '';
    position: absolute;
    top: 15%;
    left: 25%;
    width: 50%;
    height: 25%;
    background: linear-gradient(45deg, transparent 0%, rgba(255, 255, 255, 0.15) 30%, rgba(255, 255, 255, 0.4) 50%, rgba(255, 255, 255, 0.15) 70%, transparent 100%);
    border-radius: 50%;
    transform: rotate(-30deg);
    animation: cdShineClean 4s ease-in-out infinite;
}

@keyframes cdShineClean {
    0%, 100% {
        opacity: 0.6;
        transform: rotate(-30deg) scale(0.9);
    }

    50% {
        opacity: 0.8;
        transform: rotate(-30deg) scale(1.05);
    }
}

.cd-label {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 15;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(5px);
}

.cd-title-on-label {
    color: #2d3748;
    font-size: 10px;
    font-weight: bold;
    text-align: center;
    line-height: 1.2;
    margin-bottom: 4px;
    max-width: 70px;
    word-wrap: break-word;
}

.cd-artist-on-label {
    font-size: 8px;
    color: #718096;
    text-align: center;
    font-style: italic;
    max-width: 70px;
    word-wrap: break-word;
}

/* ========================= 影视服务区域 ========================= */
.media {
    background: #f8f9fa;
    padding: 4rem 0;
}

.media-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.media-tabs {
    display: flex;
    justify-content: center;
    gap: 0;
    margin-bottom: 3rem;
    flex-wrap: wrap;
    background: #f8f9fa;
    border-radius: 25px;
    padding: 5px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 3rem;
}

.media-tab {
    padding: 1rem 1.5rem;
    background: white;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    color: #636e72;
    transition: all 0.3s ease;
    border-radius: 20px;
    white-space: nowrap;
    position: relative;
    margin: 2px;
    font-weight: 500;
}

    .media-tab.active {
        background: #00b894;
        color: white;
        box-shadow: 0 2px 10px rgba(0, 184, 148, 0.3);
    }

    .media-tab:hover:not(.active) {
        background: rgba(0, 184, 148, 0.1);
        color: #00b894;
        transform: translateY(-2px);
    }

/* ========================= 视频播放区域 ========================= */
.video-section {
    position: relative;
    max-width: 1400px;
    margin: 0 auto;
}

.video-container {
    position: relative;
    width: 100%;
    height: 650px;
    background: #000;
    border-radius: 20px;
    overflow: hidden;
    margin: 0 auto;
    transition: all 0.5s ease;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
}

    .video-container.switching {
        opacity: 0.8;
        transform: scale(0.99);
    }

.video-player {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.3s ease;
}

.video-poster {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 2;
    transition: opacity 0.3s ease;
    cursor: pointer;
}

    .video-poster.hidden {
        opacity: 0;
        pointer-events: none;
        z-index: 0;
    }

.video-overlay-play {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 140px;
    height: 140px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 3;
    opacity: 1;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
    border: none;
}

    .video-overlay-play.hidden {
        opacity: 0;
        pointer-events: none;
    }

    .video-overlay-play:hover {
        background: white;
        transform: translate(-50%, -50%) scale(1.1);
    }

    .video-overlay-play::after {
        content: '';
        width: 0;
        height: 0;
        border-left: 40px solid #00b894;
        border-top: 24px solid transparent;
        border-bottom: 24px solid transparent;
        margin-left: 10px;
    }

.video-info {
    position: absolute;
    bottom: 120px;
    left: 40px;
    right: 40px;
    z-index: 3;
    color: white;
    transition: opacity 0.3s ease;
}

    .video-info.hidden {
        opacity: 0;
        pointer-events: none;
    }

.video-title {
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 0.8rem;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.video-description {
    font-size: 1.2rem;
    opacity: 0.9;
    line-height: 1.5;
    text-shadow: 0 1px 5px rgba(0, 0, 0, 0.5);
}

.video-controls {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    padding: 3rem 2rem 1.5rem;
    z-index: 3;
    transition: opacity 0.3s ease;
}

    .video-controls.hidden {
        opacity: 0;
        pointer-events: none;
    }

.video-control-bar {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.play-pause-btn {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    flex-shrink: 0;
}

    .play-pause-btn:hover {
        background: white;
        transform: scale(1.1);
    }

.play-icon, .pause-icon {
    width: 20px;
    height: 20px;
    fill: #00b894;
}

.progress-container {
    flex-grow: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 3px;
    cursor: pointer;
    position: relative;
    margin: 0 1rem;
}

.progress-bar {
    height: 100%;
    background: #00b894;
    border-radius: 3px;
    width: 0%;
    transition: width 0.1s ease;
    position: relative;
}

    .progress-bar::after {
        content: '';
        position: absolute;
        right: -6px;
        top: 50%;
        transform: translateY(-50%);
        width: 12px;
        height: 12px;
        background: #00b894;
        border-radius: 50%;
        opacity: 0;
        transition: opacity 0.3s ease;
    }

.progress-container:hover .progress-bar::after {
    opacity: 1;
}

.time-display {
    color: white;
    font-size: 0.9rem;
    font-weight: 500;
    min-width: 80px;
    text-align: center;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.volume-btn {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

    .volume-btn:hover {
        background: white;
    }

.volume-icon {
    width: 16px;
    height: 16px;
    fill: #00b894;
}

.fullscreen-btn {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

    .fullscreen-btn:hover {
        background: white;
    }

.fullscreen-icon {
    width: 16px;
    height: 16px;
    fill: #00b894;
}

.video-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 4;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

    .video-nav:hover {
        background: white;
        transform: translateY(-50%) scale(1.1);
    }

    .video-nav.prev {
        left: 40px;
    }

    .video-nav.next {
        right: 40px;
    }

.nav-icon {
    width: 32px;
    height: 32px;
    fill: #00b894;
}

/* ========================= 视频全屏样式 ========================= */
.video-container:-webkit-full-screen {
    width: 100vw;
    height: 100vh;
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-container:-moz-full-screen {
    width: 100vw;
    height: 100vh;
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-container:fullscreen {
    width: 100vw;
    height: 100vh;
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-container:-webkit-full-screen .video-player {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.video-container:-moz-full-screen .video-player {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.video-container:fullscreen .video-player {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* ========================= IT服务区域 ========================= */
.it-services {
    background: white;
    padding: 4rem 0;
}

.it-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ========================= 桌面端IT服务网格 ========================= */
.it-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 4rem;
}

/* ========================= 移动端IT服务轮播 ========================= */
.it-carousel {
    display: none;
    position: relative;
    overflow: hidden;
    margin-bottom: 4rem;
}

.it-carousel-container {
    display: flex;
    transition: transform 0.6s ease;
    will-change: transform;
}

.it-carousel-slide {
    min-width: 100%;
    padding: 0 1rem;
}

.it-carousel-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.it-carousel-btn {
    width: 50px;
    height: 50px;
    background: rgba(0, 184, 148, 0.1);
    border: 2px solid #00b894;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: #00b894;
    font-size: 1.2rem;
    font-weight: bold;
}

    .it-carousel-btn:hover {
        background: #00b894;
        color: white;
        transform: scale(1.1);
    }

    .it-carousel-btn:disabled {
        opacity: 0.3;
        cursor: not-allowed;
        transform: none;
    }

        .it-carousel-btn:disabled:hover {
            background: rgba(0, 184, 148, 0.1);
            color: #00b894;
        }

.it-carousel-indicators {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.it-carousel-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(0, 184, 148, 0.3);
    cursor: pointer;
    transition: all 0.3s ease;
}

    .it-carousel-dot.active {
        background: #00b894;
        transform: scale(1.2);
    }

.it-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 4px 25px rgba(0, 0, 0, 0.08);
    transition: all 0.4s ease;
    cursor: pointer;
    min-height: 450px;
    border: 1px solid rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
    position: relative;
}

    .it-card:hover {
        transform: translateY(-8px);
        box-shadow: 0 15px 45px rgba(0, 0, 0, 0.12);
    }

.it-card-image {
    width: 100%;
    height: 200px;
    background-size: cover;
    background-position: center;
    position: relative;
    flex-shrink: 0;
}

.it-card:nth-child(1) .it-card-image {
    background-image: url('https://images.unsplash.com/photo-1486406146926-c627a92ad1ab?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80');
}

.it-card:nth-child(2) .it-card-image {
    background-image: url('https://images.unsplash.com/photo-1545324418-cc1a3fa10c00?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80');
}

.it-card:nth-child(3) .it-card-image {
    background-image: url('https://images.unsplash.com/photo-1555636222-cae831e670b3?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80');
}

.it-card:nth-child(4) .it-card-image {
    background-image: url('https://images.unsplash.com/photo-1582268611958-ebfd161ef9cf?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80');
}

.it-card:nth-child(5) .it-card-image {
    background-image: url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80');
}

.it-carousel-slide:nth-child(1) .it-card-image {
    background-image: url('https://images.unsplash.com/photo-1486406146926-c627a92ad1ab?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80');
}

.it-carousel-slide:nth-child(2) .it-card-image {
    background-image: url('https://images.unsplash.com/photo-1545324418-cc1a3fa10c00?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80');
}

.it-carousel-slide:nth-child(3) .it-card-image {
    background-image: url('https://images.unsplash.com/photo-1555636222-cae831e670b3?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80');
}

.it-carousel-slide:nth-child(4) .it-card-image {
    background-image: url('https://images.unsplash.com/photo-1582268611958-ebfd161ef9cf?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80');
}

.it-carousel-slide:nth-child(5) .it-card-image {
    background-image: url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80');
}

.it-card-logo {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(10px);
}

    .it-card-logo::after {
        content: '';
        width: 0;
        height: 0;
        border-left: 15px solid transparent;
        border-right: 15px solid transparent;
        border-bottom: 24px solid #00b894;
    }

.it-card-content {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    min-height: 250px;
}

.it-card-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: #2d3436;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.it-card-description {
    font-size: 0.95rem;
    color: #666;
    line-height: 1.7;
    margin-bottom: 1.5rem;
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.it-card-company {
    color: #00b894;
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
    font-weight: 600;
    border-left: 4px solid #00b894;
    padding-left: 1rem;
    background: rgba(0, 184, 148, 0.05);
    padding: 0.8rem 1rem;
    border-radius: 8px;
}

.it-card-btn {
    background: linear-gradient(135deg, #00b894, #00a085);
    color: white;
    border: none;
    padding: 0.8rem 2rem;
    border-radius: 25px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s ease;
    width: fit-content;
    margin-top: auto;
    box-shadow: 0 4px 15px rgba(0, 184, 148, 0.3);
}

    .it-card-btn:hover {
        background: linear-gradient(135deg, #00a085, #008f7a);
        transform: translateY(-2px);
        box-shadow: 0 6px 20px rgba(0, 184, 148, 0.4);
    }

/* ========================= 回到顶部按钮 ========================= */
.back-to-top {
    position: fixed;
    bottom: 60px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: #00b894;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 8px 25px rgba(0, 184, 148, 0.3);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.4s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

    .back-to-top.visible {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .back-to-top:hover {
        background: #00a085;
        transform: translateY(-5px);
        box-shadow: 0 12px 35px rgba(0, 184, 148, 0.4);
    }

.back-to-top-icon {
    width: 24px;
    height: 24px;
    fill: white;
    transition: transform 0.3s ease;
}

.back-to-top:hover .back-to-top-icon {
    transform: translateY(-2px);
}

/* ========================= 联系按钮 - 完全清理重复后的统一样式 ========================= */
.contact-sidebar {
    position: fixed;
    right: 0;
    top: 35%;
    transform: translateY(-50%);
    z-index: 1000;
    max-width: 280px;
}

/* 🎯 桌面端联系按钮基础样式 */
.contact-btn {
    background: linear-gradient(135deg, #00b894 0%,#00b894 100%);
    color: white;
    border: none;
    border-radius: 25px 0 0 25px;
    padding: 15px 8px 15px 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 600;
    min-height: 60px;
    width: 140px;
    position: relative;
    overflow: hidden;
    /* 🔧 统一过渡效果 */
    transition: all 1.5s cubic-bezier(0.23, 1, 0.32, 1);
    /* 🔧 统一初始位置 */
    transform: translateX(calc(100% - 40px));
    /* 🔧 统一阴影效果 */
    box-shadow: -5px 5px 20px rgba(102, 126, 234, 0.25), -2px 2px 10px rgba(102, 126, 234, 0.15);
    /* 🔧 统一呼吸动画 */
    animation: contactBreathe 6s ease-in-out infinite;
}

/* 🔧 桌面端呼吸动画 */
@keyframes contactBreathe {
    0%, 100% {
        box-shadow: -5px 5px 20px rgba(102, 126, 234, 0.25), -2px 2px 10px rgba(102, 126, 234, 0.15);
        transform: translateX(calc(100% - 40px)) scale(1);
    }

    50% {
        box-shadow: -7px 7px 25px rgba(102, 126, 234, 0.35), -3px 3px 12px rgba(102, 126, 234, 0.2);
        transform: translateX(calc(100% - 42px)) scale(1.01);
    }
}

/* 🔧 桌面端悬停效果 */
.contact-btn:hover {
    /* 🚀 关键修复：悬停时停止动画，启用过渡 */
    animation: none !important;
    /* 🔧 缓慢向左平移 */
    transform: translateX(8px) scale(1.03) !important;
    /* 🔧 增强阴影效果 */
    box-shadow: -15px 15px 45px rgba(102, 126, 234, 0.5), -8px 8px 25px rgba(102, 126, 234, 0.3) !important;
    /* 🔧 渐变色变化 */
    background: linear-gradient(135deg, #5a67d8 0%, #6b46c1 100%);
}

/* 🔧 按钮元素样式 */
.contact-btn::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: rgba(255, 255, 255, 0.3);
    transition: all 0.5s ease;
}

.contact-btn:hover::before {
    width: 5px;
    background: rgba(255, 255, 255, 0.5);
}

.contact-btn::after {
    content: '';
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 6px solid rgba(255, 255, 255, 0.6);
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    transition: all 1.0s cubic-bezier(0.23, 1, 0.32, 1);
    opacity: 1;
}

.contact-btn:hover::after {
    opacity: 0;
    transform: translateY(-50%) translateX(8px) scale(0.8);
}

/* 🔧 图标和文字样式 */
.contact-icon {
    width: 20px;
    height: 20px;
    fill: white;
    flex-shrink: 0;
    transition: all 1.0s cubic-bezier(0.23, 1, 0.32, 1);
}

.contact-btn:hover .contact-icon {
    transform: scale(1.15) rotate(3deg);
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.contact-text {
    white-space: nowrap;
    opacity: 0.9;
    transition: all 1.0s cubic-bezier(0.23, 1, 0.32, 1);
    transform: translateX(0);
}

.contact-btn:hover .contact-text {
    opacity: 1;
    transform: translateX(1px);
    text-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

/* 🔧 移动端展开状态 */
.contact-btn.expanded {
    /* 🚀 关键修复：展开时停止动画，启用过渡 */
    animation: none !important;
    /* 🔧 移动端展开位置 */
    transform: translateX(-5px) scale(1.05) !important;
    /* 🔧 增强阴影效果 */
    box-shadow: -18px 18px 50px rgba(102, 126, 234, 0.6), -10px 10px 30px rgba(102, 126, 234, 0.4) !important;
    /* 🔧 渐变色变化 */
    background: linear-gradient(135deg, #5a67d8 0%, #6b46c1 100%);
}

    .contact-btn.expanded .contact-icon {
        transform: scale(1.2) rotate(5deg);
        filter: drop-shadow(0 3px 6px rgba(0,0,0,0.3));
    }

    .contact-btn.expanded .contact-text {
        opacity: 1;
        transform: translateX(2px);
        text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    }

    .contact-btn.expanded::after {
        opacity: 0;
        transform: translateY(-50%) translateX(12px) scale(0.6);
    }

/* 🔧 焦点状态 (键盘访问) */
.contact-btn:focus {
    outline: 2px solid rgba(255, 255, 255, 0.5);
    outline-offset: 2px;
}

    .contact-btn:focus:not(:hover) {
        animation: none !important;
        transform: translateX(calc(100% - 60px)) !important;
    }

/* ========================= 联系我们弹窗 ========================= */
.contact-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s cubic-bezier(0.19, 1, 0.22, 1);
    pointer-events: none;
}

    .contact-modal.active {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
    }

.contact-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    transition: all 0.4s ease;
}

.contact-modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-30%, -50%) scale(0.8);
    background: white;
    border-radius: 20px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    overflow-y: auto;
    transition: all 0.5s cubic-bezier(0.19, 1, 0.22, 1);
    opacity: 0;
}

.contact-modal.active .contact-modal-content {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
}

.contact-modal-header {
    padding: 30px 30px 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 20px 20px 0 0;
}

    .contact-modal-header h3 {
        margin: 0;
        font-size: 1.8rem;
        font-weight: 600;
        color: #2d3436;
        display: flex;
        align-items: center;
        gap: 12px;
    }

        .contact-modal-header h3::before {
            content: '';
            width: 0;
            height: 0;
            border-left: 15px solid transparent;
            border-right: 15px solid transparent;
            border-bottom: 25px solid #00b894;
        }

.contact-modal-close {
    width: 40px;
    height: 40px;
    border: none;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

    .contact-modal-close:hover {
        background: rgba(0, 0, 0, 0.1);
        transform: rotate(90deg);
    }

    .contact-modal-close svg {
        width: 20px;
        height: 20px;
        fill: #666;
    }

.contact-modal-body {
    padding: 30px;
}

.contact-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 25px;
    background: rgba(0, 184, 148, 0.02);
    border-radius: 15px;
    border: 1px solid rgba(0, 184, 148, 0.1);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

    .contact-info-item:hover {
        transform: translateY(-5px);
        box-shadow: 0 15px 35px rgba(0, 184, 148, 0.1);
        background: rgba(0, 184, 148, 0.05);
    }

.contact-info-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #00b894, #00a085);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 8px 20px rgba(0, 184, 148, 0.3);
}

    .contact-info-icon svg {
        width: 24px;
        height: 24px;
        fill: white;
    }

.contact-info-content h4 {
    margin: 0 0 8px 0;
    font-size: 1.2rem;
    font-weight: 600;
    color: #2d3436;
}

.contact-info-content p {
    margin: 4px 0;
    color: #636e72;
    font-size: 0.95rem;
    line-height: 1.5;
}

.copy-tip {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(0, 184, 148, 0.9);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.contact-info-item:hover .copy-tip {
    opacity: 1;
}

.contact-qr-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 30px;
    border-radius: 15px;
    text-align: center;
}

    .contact-qr-section h4 {
        margin: 0 0 25px 0;
        font-size: 1.3rem;
        font-weight: 600;
        color: #2d3436;
    }

.qr-codes {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.qr-code-item {
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    padding: 15px;
    border-radius: 12px;
}

    .qr-code-item:hover {
        background: rgba(0, 184, 148, 0.05);
        transform: translateY(-3px);
    }

.qr-code-placeholder {
    width: 120px;
    height: 120px;
    background: white;
    border: 2px solid #00b894;
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
    box-shadow: 0 8px 25px rgba(0, 184, 148, 0.15);
    transition: all 0.3s ease;
}

    .qr-code-placeholder:hover {
        transform: scale(1.05);
        box-shadow: 0 12px 35px rgba(0, 184, 148, 0.25);
    }

    .qr-code-placeholder svg {
        width: 60px;
        height: 60px;
        fill: #00b894;
    }

.qr-code-item p {
    margin: 0;
    font-size: 0.9rem;
    font-weight: 600;
    color: #636e72;
}

/* ========================= 二维码弹窗样式 ========================= */
.qr-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10001;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    pointer-events: none;
}

    .qr-modal.active {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
    }

.qr-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
}

.qr-modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.8);
    background: white;
    border-radius: 20px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
    width: 90%;
    max-width: 400px;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.19, 1, 0.22, 1);
    opacity: 0;
}

.qr-modal.active .qr-modal-content {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
}

.qr-modal-header {
    padding: 25px 25px 15px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

    .qr-modal-header h3 {
        margin: 0;
        font-size: 1.3rem;
        font-weight: 600;
        color: #2d3436;
        display: flex;
        align-items: center;
        gap: 10px;
    }

.qr-modal-close {
    width: 35px;
    height: 35px;
    border: none;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

    .qr-modal-close:hover {
        background: rgba(0, 0, 0, 0.1);
        transform: rotate(90deg);
    }

    .qr-modal-close svg {
        width: 16px;
        height: 16px;
        fill: #666;
    }

.qr-modal-body {
    padding: 30px;
}

.qr-code-display {
    width: 200px;
    height: 200px;
    background: #f8f9fa;
    border: 2px solid #00b894;
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    box-shadow: 0 8px 25px rgba(0, 184, 148, 0.15);
}

    .qr-code-display svg {
        width: 120px;
        height: 120px;
        fill: #00b894;
    }

.qr-code-tips {
    color: #636e72;
    font-size: 0.9rem;
    line-height: 1.5;
    margin-top: 15px;
}

/* ========================= 底部样式 ========================= */
footer {
    background: #1a1a1a;
    color: #ffffff;
    padding: 0;
    border-top: 1px solid #333;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
}

/* ========================= 桌面端底部 ========================= */
.footer-desktop {
    display: block;
    padding: 3rem 2rem 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-company {
    display: flex;
    align-items: flex-start;
    gap: 15px;
}

    .footer-company .logo-triangle {
        margin-top: 5px;
        border-bottom-color: #00b894;
    }

.company-details h4 {
    color: #ffffff;
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.company-details .english {
    color: #888;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}


.footer-logo {
    display: flex;
    align-items: flex-start;
    gap: 15px;
}

    .footer-logo ul li{
        list-style:none;
        display:inline-block;
       width:100%;
        text-align:center;
        
    }

    .company-info {
        color: #ccc;
        font-size: 0.9rem;
        line-height: 1.6;
    }

.footer-section h4 {
    color: #00b894;
    margin-bottom: 1rem;
    font-size: 1rem;
    font-weight: 600;
}

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

    .footer-section ul li {
        margin-bottom: 0.5rem;
    }

        .footer-section ul li a {
            color: #ccc;
            text-decoration: none;
            transition: color 0.3s ease;
            font-size: 0.875rem;
            line-height: 1.5;
        }

            .footer-section ul li a:hover {
                color: #00b894;
            }

/* ========================= 移动端底部 ========================= */
.footer-mobile {
    display: none;
    background: #1a1a1a;
}

.footer-contact-info {
    margin: 0;
    padding: 2rem 1.5rem;
    background: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
    border-bottom: 1px solid #333;
    text-align: center;
}

    .footer-contact-info h4 {
        color: #00b894;
        font-size: 1.1rem;
        font-weight: 600;
        margin-bottom: 1rem;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
    }

        .footer-contact-info h4::before {
            content: '';
            width: 0;
            height: 0;
            border-left: 12px solid transparent;
            border-right: 12px solid transparent;
           /* border-bottom: 20px solid #00b894;*/
        }

    .footer-contact-info p {
        color: #ccc;
        font-size: 0.85rem;
        margin-bottom: 0.5rem;
        line-height: 1.6;
    }

        .footer-contact-info p:last-child {
            margin-bottom: 0;
            padding-top: 0.5rem;
            border-top: 1px solid #333;
            margin-top: 1rem;
        }

.footer-menu-sections {
    display: grid;
    /*grid-template-columns: 1fr 1fr;*/
    gap: 0;
}

.footer-menu-section {
    background: #1a1a1a;
    border-right: 1px solid #333;
    border-bottom: 1px solid #333;
}

    .footer-menu-section:nth-child(even) {
        border-right: none;
    }

    .footer-menu-section:nth-child(n+5) {
        border-bottom: none;
    }

.footer-menu-header {
    padding: 1.5rem;
    background: #1a1a1a;
    color: #00b894;
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

    .footer-menu-header:hover {
        background: rgba(0, 184, 148, 0.1);
    }

    .footer-menu-header.active {
        background: rgba(0, 184, 148, 0.15);
    }

.footer-menu-icon {
    width: 16px;
    height: 16px;
    transition: transform 0.3s ease;
    fill: #00b894;
}

.footer-menu-header.active .footer-menu-icon {
    transform: rotate(180deg);
}

.footer-menu-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: #222;
}

    .footer-menu-content.active {
        max-height: 300px;
    }

.footer-menu-links {
    padding: 0 1.5rem 1rem;
    list-style: none;
}

    .footer-menu-links li {
        margin-bottom: 0.8rem;
    }

    .footer-menu-links a {
        color: #ccc;
        text-decoration: none;
        font-size: 0.875rem;
        line-height: 1.5;
        transition: color 0.3s ease;
        display: block;
        padding: 0.3rem 0;
    }

        .footer-menu-links a:hover {
            color: #00b894;
        }

.footer-bottom {
    border-top: 1px solid #333;
    padding: 1.5rem;
    text-align: center;
    background: #111;
}

.footer-bottom-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1rem;
}

.footer-bottom p {
    color: #888;
    font-size: 0.75rem;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

    .footer-bottom p:last-child {
        margin-bottom: 0;
    }

.footer-links-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    justify-content: center;
    margin-bottom: 1rem;
    padding: 1rem 0;
    border-top: 1px solid #333;
}

    .footer-links-row a {
        color: #00b894;
        text-decoration: none;
        font-size: 0.8rem;
        transition: opacity 0.2s ease;
        padding: 0.5rem 1rem;
        border: 1px solid #333;
        border-radius: 20px;
        background: rgba(0, 184, 148, 0.1);
    }

        .footer-links-row a:hover {
            opacity: 0.8;
            background: rgba(0, 184, 148, 0.2);
        }

/* ========================= 移动端菜单遮罩 ========================= */
.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    pointer-events: none;
}

    .mobile-menu-overlay.active {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
    }

/* ========================= 动画效果 ========================= */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

.fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

.content-hidden {
    display: none;
}

/* ========================= 平滑滚动 ========================= */
html {
    scroll-behavior: smooth;
}

/* ========================= 响应式设计 - 大屏幕 (1400px+) ========================= */
@media (min-width: 1400px) {
    .contact-sidebar {
        top: 35%;
    }

 

    .contact-btn {
        padding: 18px 10px 18px 25px;
        width: 160px;
        min-height: 70px;
        font-size: 15px;
        transform: translateX(calc(100% - 50px));
    }
    /* 大屏幕呼吸动画调整 */
    @keyframes contactBreathe {
        0%, 100% {
            box-shadow: -5px 5px 20px rgba(102, 126, 234, 0.25), -2px 2px 10px rgba(102, 126, 234, 0.15);
            transform: translateX(calc(100% - 50px)) scale(1);
        }

        50% {
            box-shadow: -7px 7px 25px rgba(102, 126, 234, 0.35), -3px 3px 12px rgba(102, 126, 234, 0.2);
            transform: translateX(calc(100% - 52px)) scale(1.01);
        }
    }

    .contact-btn:hover {
        transform: translateX(10px) scale(1.03) !important;
    }

    .contact-btn:focus:not(:hover) {
        transform: translateX(calc(100% - 70px)) !important;
    }
}

/* ========================= 响应式设计 - 中等屏幕 (≤1024px) ========================= */
@media (max-width: 1024px) {
    .hero {
       /* min-height: 80vh;*/
    }
    
    .Video-area {
        width: 100%;
        height: 100%;
      /*  min-height:480px;*/
        object-fit: cover;
        vertical-align: middle;
    }

    .hero-container {
        gap: 3rem;
    }

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

    .books-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 1.5rem;
    }

    .it-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }

    .it-card {
        min-height: 420px;
    }

    .it-card-image {
        height: 160px;
    }

    .it-card-content {
        min-height: 240px;
        padding: 1.3rem;
    }

    .video-container {
        height: 550px;
    }

    .video-title {
        font-size: 1.6rem;
    }

    .video-description {
        font-size: 1.1rem;
    }

    .video-overlay-play {
        width: 120px;
        height: 120px;
    }

        .video-overlay-play::after {
            border-left: 35px solid #00b894;
            border-top: 20px solid transparent;
            border-bottom: 20px solid transparent;
            margin-left: 8px;
        }

    .contact-sidebar {
        top: 30%;
    }

    .contact-btn:hover {
        transform: translateX(5px) scale(1.02) !important;
        transition: all 1.3s cubic-bezier(0.23, 1, 0.32, 1);
    }

    .contact-icon {
        width: 18px;
        height: 18px;
    }
}

/* ========================= 响应式设计 - 移动端 (≤768px) ========================= */
@media (max-width: 768px) {
    .desktop-nav {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-nav {
        display: block;
    }

    .mobile-menu-overlay {
        display: block;
    }

    .nav-container {
        padding: 0.8rem 1.5rem;
        min-height: 56px;
    }

    .logo-text .chinese {
        font-size: 14px;
    }

    .logo-text .english {
        font-size: 8px;
    }

    .logo-triangle {
        border-left: 16px solid transparent;
        border-right: 16px solid transparent;
        border-bottom: 28px solid #00b894;
    }

        .logo-triangle::after {
            top: 5px;
            left: -12px;
            border-left: 12px solid transparent;
            border-right: 12px solid transparent;
            border-bottom: 22px solid white;
        }


    .hero-video {
       max-height:280px;
    
    }
    /*
    .hero {
        min-height: 60vh;
        padding-top: 80px;
    }*/
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
        padding: 0 1.5rem;
    }

    .hero-content h1 {
        font-size: 2.2rem;
        margin-bottom: 1.5rem;
        margin-top: 4.5rem;
    }

    .hero-content p {
        font-size: 1rem;
        margin-bottom: 2rem;
    }

    .hero-video-container {
        height: 280px;
    }

    .stats {
        margin-top: -20px;
    }

    .stats-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
        padding: 2rem 1.5rem;
    }

    .stat-number {
        font-size: 2.2rem;
    }

    .section-title {
        font-size: 2rem;
        margin-bottom: 0.8rem;
    }

    .section-subtitle {
        font-size: 1rem;
        margin-bottom: 2rem;
    }

    .category-tabs {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 0.5rem;
        padding: 0.8rem;
        border-radius: 15px;
        max-width: 100%;
    }

    .category-tab {
        font-size: 0.9rem;
        padding: 0.8rem 0.5rem;
        border-radius: 12px;
        text-align: center;
        white-space: nowrap;
    }

    .media-tabs {
        display: grid;
        grid-template-columns: 1fr 1fr 1fr;
        grid-template-rows: 1fr 1fr;
        gap: 0.5rem;
        padding: 1rem;
        max-width: 100%;
        border-radius: 15px;
        margin-bottom: 2rem;
    }

    .media-tab {
        padding: 0.8rem 1rem;
        font-size: 0.9rem;
        border-radius: 12px;
        margin: 0;
        text-align: center;
        display: flex;
        align-items: center;
        justify-content: center;
    }

        .media-tab:nth-child(4) {
            grid-column: 1;
            grid-row: 2;
        }

        .media-tab:nth-child(5) {
            grid-column: 2 / 4;
            grid-row: 2;
        }

    .books-grid {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
        gap: 1rem;
    }

    .book-item[data-category="digital"] .book-cover {
        width: 140px;
        height: 190px;
    }

    .book-item[data-category="ebook"] .book-cover {
        width: 120px;
        height: 170px;
    }

    .book-item[data-category="audio"] .book-cover {
        width: 150px;
        height: 150px;
    }

    .cd-label {
        width: 70px;
        height: 70px;
    }

    .cd-title-on-label {
        font-size: 9px;
        max-width: 60px;
    }

    .cd-artist-on-label {
        font-size: 7px;
        max-width: 60px;
    }

    .video-container {
        height: 400px;
        border-radius: 15px;
    }

    .video-nav {
        width: 60px;
        height: 60px;
    }

        .video-nav.prev {
            left: 20px;
        }

        .video-nav.next {
            right: 20px;
        }

    .nav-icon {
        width: 24px;
        height: 24px;
    }

    .video-overlay-play {
        width: 100px;
        height: 100px;
    }

        .video-overlay-play::after {
            border-left: 30px solid #00b894;
            border-top: 18px solid transparent;
            border-bottom: 18px solid transparent;
            margin-left: 8px;
        }

    .video-title {
        font-size: 1.4rem;
    }

    .video-description {
        font-size: 1rem;
    }

    .video-info {
        bottom: 120px;
        left: 20px;
        right: 20px;
    }

    .video-controls {
        padding: 2rem 1rem 1rem;
    }

    .play-pause-btn {
        width: 45px;
        height: 45px;
    }

    .volume-btn, .fullscreen-btn {
        width: 35px;
        height: 35px;
    }

    .volume-icon, .fullscreen-icon {
        width: 14px;
        height: 14px;
    }

    .time-display {
        font-size: 0.8rem;
        min-width: 70px;
    }

    .it-grid {
        display: none;
    }

    .it-carousel {
        display: block;
    }

    .it-card {
        min-height: 400px;
        margin: 0 auto;
        max-width: 350px;
    }

    .it-card-image {
        height: 180px;
    }

    .it-card-content {
        min-height: 200px;
        padding: 1.5rem;
    }

    .it-card-title {
        font-size: 1.2rem;
    }

    .it-card-description {
        font-size: 0.9rem;
        -webkit-line-clamp: 3;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .footer-desktop {
        display: none;
    }

    .footer-mobile {
        display: block;
    }

    .mobile-nav {
        top: 57px;
    }
    /* ========================= 移动端联系按钮完整样式 ========================= */
    .contact-sidebar {
        top: 30%;
    }

    .contact-btn {
        /* 🔧 移动端尺寸和样式 */
        border-radius: 20px 0 0 20px;
        width: 110px;
        height: 50px;
        min-height: 50px;
        padding: 0 8px 0 15px;
        gap: 8px;
        font-size: 13px;
        /* 🔧 移动端初始位置 */
        transform: translateX(calc(100% - 30px)) !important;
        /* 🔧 移动端阴影 */
        box-shadow: -4px 4px 15px rgba(102, 126, 234, 0.3) !important;
        /* 🔧 移动端动画 */
        animation: mobileContactBreathe 5s ease-in-out infinite !important;
        /* 🔧 移动端过渡 */
        transition: all 1.2s cubic-bezier(0.23, 1, 0.32, 1) !important;
    }
    /* 🔧 移动端呼吸动画 */
    @keyframes mobileContactBreathe {
        0%, 100% {
            transform: translateX(calc(100% - 30px));
            box-shadow: -4px 4px 15px rgba(102, 126, 234, 0.3);
        }

        50% {
            transform: translateX(calc(100% - 35px));
            box-shadow: -5px 5px 18px rgba(102, 126, 234, 0.4);
        }
    }
    /* 🔧 移动端悬停/点击效果 */
    .contact-btn:hover,
    .contact-btn:active {
        animation: none !important;
        transform: translateX(10px) !important;
        box-shadow: -6px 6px 20px rgba(102, 126, 234, 0.45) !important;
        background: linear-gradient(135deg, #5a67d8 0%, #6b46c1 100%) !important;
    }

    .contact-btn:active {
        transform: translateX(5px) scale(0.98) !important;
    }

    .contact-btn.expanded {
        animation: none !important;
        transform: translateX(-3px) scale(1.04) !important;
        box-shadow: -12px 12px 35px rgba(102, 126, 234, 0.5), -6px 6px 20px rgba(102, 126, 234, 0.3) !important;
        transition: all 1.2s cubic-bezier(0.23, 1, 0.32, 1) !important;
    }

    .contact-icon {
        width: 18px;
        height: 18px;
    }

    .contact-btn:focus:not(:hover) {
        transform: translateX(calc(100% - 45px)) !important;
    }
    /* 移动端联系弹窗优化 */
    .contact-modal-content {
        width: 95%;
        max-height: 85vh;
        margin: 0 auto;
        transform: translate(-50%, 20%) scale(0.9);
    }

    .contact-modal.active .contact-modal-content {
        transform: translate(-50%, -50%) scale(1);
    }

    .contact-modal-header {
        padding: 20px;
    }

        .contact-modal-header h3 {
            font-size: 1.4rem;
        }

    .contact-modal-body {
        padding: 20px;
    }

    .contact-info-grid {
        grid-template-columns: 1fr;
        gap: 15px;
        margin-bottom: 25px;
    }

    .contact-info-item {
        padding: 20px;
        gap: 15px;
    }

    .contact-info-icon {
        width: 45px;
        height: 45px;
    }

        .contact-info-icon svg {
            width: 20px;
            height: 20px;
        }

    .contact-info-content h4 {
        font-size: 1.1rem;
    }

    .contact-info-content p {
        font-size: 0.9rem;
    }

    .contact-qr-section {
        padding: 20px;
    }

        .contact-qr-section h4 {
            font-size: 1.2rem;
            margin-bottom: 20px;
        }

    .qr-codes {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 20px;
        max-width: 300px;
        margin: 0 auto;
    }

    .qr-code-item {
        padding: 10px;
        border-radius: 10px;
    }

    .qr-code-placeholder {
        width: 100px;
        height: 100px;
        margin-bottom: 10px;
    }

        .qr-code-placeholder svg {
            width: 50px;
            height: 50px;
        }

    .qr-code-item p {
        font-size: 0.85rem;
    }

    .qr-modal-content {
        width: 85%;
        max-width: 320px;
    }

    .qr-modal-header {
        padding: 20px 20px 10px;
    }

        .qr-modal-header h3 {
            font-size: 1.2rem;
        }

    .qr-modal-body {
        padding: 20px;
    }

    .qr-code-display {
        width: 160px;
        height: 160px;
    }

        .qr-code-display svg {
            width: 100px;
            height: 100px;
        }

    .qr-code-tips {
        font-size: 0.85rem;
    }
}

/* ========================= 响应式设计 - 超小屏幕 (≤480px) ========================= */
@media (max-width: 480px) {
    .nav-container {
        padding: 0.6rem 1rem;
        min-height: 52px;
    }
    .Video-area{
        height:100%;
    }
    .logo-text .chinese {
        font-size: 12px;
    }

    .logo-text .english {
        font-size: 7px;
    }

  /*  .hero {
        min-height: 60vh;
        padding-top: 20px;
    }
*/
    .hero-container {
        padding: 0 1rem;
    }

    .stats-container {
        /* grid-template-columns: 1fr;*/
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
        padding: 1.5rem 1rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .hero-content h1 {
        font-size: 1.9rem;
    }

    .hero-video-container {
        height: 250px;
    }

    .book-item[data-category="digital"] .book-cover {
        width: 120px;
        height: 170px;
    }

    .book-item[data-category="ebook"] .book-cover {
        width: 100px;
        height: 150px;
    }

    .book-item[data-category="audio"] .book-cover {
        width: 130px;
        height: 130px;
    }

    .cd-label {
        width: 60px;
        height: 60px;
    }

    .cd-title-on-label {
        font-size: 8px;
        max-width: 50px;
    }

    .cd-artist-on-label {
        font-size: 6px;
        max-width: 50px;
    }

    .video-container {
        height: 280px;
        border-radius: 12px;
    }

    .video-nav {
        width: 50px;
        height: 50px;
    }

        .video-nav.prev {
            left: 15px;
        }

        .video-nav.next {
            right: 15px;
        }

    .nav-icon {
        width: 20px;
        height: 20px;
    }

    .video-overlay-play {
        width: 80px;
        height: 80px;
    }

        .video-overlay-play::after {
            border-left: 24px solid #00b894;
            border-top: 14px solid transparent;
            border-bottom: 14px solid transparent;
            margin-left: 6px;
        }

    .video-title {
        font-size: 1.2rem;
    }

    .video-description {
        font-size: 0.9rem;
    }

    .video-info {
        bottom: 100px;
        left: 15px;
        right: 15px;
    }

    .video-controls {
        padding: 1.5rem 0.8rem 0.8rem;
    }

    .play-pause-btn {
        width: 40px;
        height: 40px;
    }

    .volume-btn, .fullscreen-btn {
        width: 32px;
        height: 32px;
    }

    .volume-icon, .fullscreen-icon {
        width: 12px;
        height: 12px;
    }

    .time-display {
        font-size: 0.75rem;
        min-width: 60px;
    }

    .progress-container {
        margin: 0 0.5rem;
    }

    .it-card {
        min-height: 350px;
        max-width: 300px;
    }

    .it-card-image {
        height: 150px;
    }

    .it-card-content {
        min-height: 180px;
        padding: 1.2rem;
    }

    .it-card-title {
        font-size: 1.1rem;
    }

    .mobile-nav {
        top: 53px;
    }

    .back-to-top {
        bottom: 90px;
        right: 15px;
        width: 45px;
        height: 45px;
    }

    .back-to-top-icon {
        width: 18px;
        height: 18px;
    }
    /* ========================= 超小屏幕联系按钮优化 ========================= */
    .contact-sidebar {
        top: 25%;
    }

    .contact-btn {
        width: 100px !important;
        height: 45px !important;
        min-height: 45px !important;
        padding: 0 6px 0 12px !important;
        font-size: 12px !important;
        border-radius: 15px 0 0 15px !important;
        transform: translateX(calc(100% - 25px)) !important;
    }

    @keyframes mobileContactBreathe {
        0%, 100% {
            transform: translateX(calc(100% - 25px));
        }

        50% {
            transform: translateX(calc(100% - 30px));
        }
    }

    .contact-btn:hover,
    .contact-btn:active {
        transform: translateX(5px) !important;
    }

    .contact-btn.expanded {
        transform: translateX(-2px) scale(1.03) !important;
        transition: all 1.1s cubic-bezier(0.23, 1, 0.32, 1) !important;
    }

    .contact-icon {
        width: 16px;
        height: 16px;
    }

    .contact-modal-content {
        width: 90%;
        max-height: 80vh;
    }

    .contact-modal-header h3 {
        font-size: 1.2rem;
    }

    .contact-info-grid {
        gap: 12px;
    }

    .contact-info-item {
        padding: 15px;
        gap: 12px;
    }

    .contact-info-icon {
        width: 40px;
        height: 40px;
    }

        .contact-info-icon svg {
            width: 18px;
            height: 18px;
        }

    .contact-info-content h4 {
        font-size: 1rem;
    }

    .contact-info-content p {
        font-size: 0.85rem;
    }

    .qr-codes {
        grid-template-columns: 1fr 1fr;
        gap: 15px;
        max-width: 250px;
    }

    .qr-code-placeholder {
        width: 80px;
        height: 80px;
    }

        .qr-code-placeholder svg {
            width: 40px;
            height: 40px;
        }

    .qr-code-item p {
        font-size: 0.8rem;
    }

    .qr-modal-content {
        width: 90%;
        max-width: 280px;
    }

    .qr-code-display {
        width: 140px;
        height: 140px;
    }

        .qr-code-display svg {
            width: 80px;
            height: 80px;
        }

    .contact-btn:focus:not(:hover) {
        transform: translateX(calc(100% - 35px)) !important;
    }
}

/* ========================= 媒体查询 - 横屏设备 ========================= */
@media screen and (orientation: portrait) {
    .video-container:fullscreen .video-player {
        object-fit: contain;
        max-width: 100vw;
        max-height: 100vh;
    }
}

@media screen and (orientation: landscape) {
    .video-container:fullscreen .video-player {
        object-fit: cover;
        width: 100vw;
        height: 100vh;
    }
}