/* ============================================
     GLOBAL STYLES
     ============================================ */
     body {
        margin: 0;
        padding: 0;
        font-family: 'Poppins', sans-serif;
        font-size: 16px;
        line-height: 1.6;
        background-color: #f5f5f5;
        /* Performance: GPU acceleration for smooth scrolling */
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
    
    /* Performance: Lazy loading placeholder */
    img[data-src] {
        opacity: 0;
        transition: opacity 0.3s;
    }
    img[data-src].loaded {
        opacity: 1;
    }
    a {
        text-decoration: none;
    }
    /* ============================================
       SECTION: HERO BANNER
       ============================================ */
    .led-hero {
        position: relative;
        height: 100vh;
        min-height: 600px;
        background-size: cover;
        background-position: center bottom;
        background-repeat: no-repeat;
        display: flex;
        align-items: flex-start;
        justify-content: center;
        color: white;
        text-align: center;
    }
    
    .led-hero::before {
        content: '';
        position: absolute;
        top: 0; left: 0;
        width: 100%; height: 100%;
        background: rgba(0, 0, 0, 0.15);
        z-index: 1;
    }
    
    .led-hero-content {
        position: relative;
        z-index: 2;
        padding-top: 30vh;
    }
    
    .led-hero h1 {
        font-size: 4rem;
        font-weight: 700;
        font-family: 'Poppins', sans-serif;
        letter-spacing: 0.05em;
        margin-bottom: 0.5rem;
    }
    
    .led-hero p {
        font-size: 1.5rem;
        font-weight: 300;
        margin-bottom: 3rem;
        opacity: 0.95;
    }
    
    .led-hero .btn {
        padding: 0.8rem 2.5rem;
        font-size: 1.2rem;
        border-radius: 50px;
        margin: 0 1rem;
    }
    
    /* Hero Section - Responsive */
    @media (max-width: 1200px) {
        .led-hero h1 { font-size: 3.5rem; }
        .led-hero p { font-size: 1.8rem; }
    }
    
    @media (max-width: 992px) {
        .led-hero h1 { font-size: 3rem; }
        .led-hero p { font-size: 1.6rem; }
    }
    
    @media (max-width: 768px) {
        .led-hero {
            min-height: 500px;
            height: auto;
        }
        .led-hero h1 { font-size: 2.5rem; }
        .led-hero p { font-size: 1.4rem; }
        .led-hero .btn { 
            display: block; 
            width: 80%; 
            margin: 1rem auto; 
        }
        .display-4{font-size: 1.5rem;}
        .specs-tab{font-size: 0.7rem !important;}
        .spec-label{white-space: wrap;}
        .title{font-size: 2.5rem !important;}
        .subtitle{font-size: 1.2rem !important;}
    }
    
    @media (max-width: 576px) {
        .led-hero h1 { font-size: 2rem; }
        .led-hero p { font-size: 1.2rem; }
    }
    /* ============================================
       SECTION: INFINITE / R5 CAROUSEL
       ============================================ */
    /* Prevent occasional horizontal overflow on mobile caused by transformed carousel stage */
    html, body {
        overflow-x: hidden;
    }
  
    .led-carousel-section,
    .r5-carousel-section {
        padding: 100px 0;
        overflow: hidden;
    }
  
    .r5-carousel-section .owl-stage-outer {
        overflow-x: hidden;
    }
  
    .led-carousel .owl-item {
        transition: transform 0.5s ease, opacity 0.5s ease;
    }
  
    .led-carousel .owl-item.center {
        opacity: 1;
        z-index: 2;
    }
  
    .led-carousel-slide {
        height: 70vh;
        min-height: 450px;
        background: #111;
        border-radius: 12px;
        overflow: hidden;
        position: relative;
    }
  
    .led-carousel-slide img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        opacity: 0.9;
        transition: opacity 0.3s;
    }
  
    .led-carousel-overlay {
        position: absolute;
        inset: 0;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        padding: 5% 8%;
        color: #fff;
        background: linear-gradient(to bottom, rgba(0,0,0,0.3) 0%, transparent 40%, rgba(0,0,0,0.6) 100%);
        pointer-events: none;
        text-align: center;
    }
  
    .led-carousel-overlay h2 {
        font-size: 2.2rem;
        font-weight: 700;
        margin: 0;
    }
  
    .led-carousel-overlay .lead {
        font-size: 1.1rem;
        margin-bottom: 15px;
        opacity: 0.9;
    }
  
    .led-carousel-overlay .features {
        list-style: none;
        padding: 0;
        display: inline-block;
        text-align: left;
        font-size: 0.95rem;
    }
  
    /* Carousel Navigation */
    .led-carousel-section .owl-nav,
    .r5-carousel-section .owl-nav {
        position: absolute;
        top: 50%;
        width: 100%;
        display: flex;
        justify-content: space-between;
        padding: 0 20px;
        pointer-events: none;
        transform: translateY(-50%);
        z-index: 10;
    }
  
    .led-carousel-section .owl-nav button,
    .r5-carousel-section .owl-nav button {
        width: 50px;
        height: 50px;
        background: rgba(0,0,0,0.4) !important;
        color: #fff !important;
        border-radius: 50% !important;
        pointer-events: auto;
        backdrop-filter: blur(5px);
        transition: all 0.3s;
    }
  
    .led-carousel-section .owl-nav button:hover,
    .r5-carousel-section .owl-nav button:hover {
        background: #000 !important;
        transform: scale(1.1);
    }
  
    /* Carousel Indicators */
    .led-carousel-section .owl-dots,
    .r5-carousel-section .owl-dots {
        margin-top: 40px;
        text-align: center;
    }
  
    .led-carousel-section .owl-dot span,
    .r5-carousel-section .owl-dot span {
        width: 30px !important;
        height: 4px !important;
        background: #ccc !important;
        border-radius: 2px !important;
        transition: all 0.3s ease !important;
    }
  
    .led-carousel-section .owl-dot.active span,
    .r5-carousel-section .owl-dot.active span {
        width: 60px !important;
        background: #333 !important;
    }
  
    /* Carousel Section - Responsive */
    @media (max-width: 1200px) {
        .led-carousel-section,
        .r5-carousel-section {
            padding: 80px 0;
        }
    }
    
    @media (max-width: 992px) {
        .led-carousel-section,
        .r5-carousel-section {
            padding: 60px 0;
        }
        .led-carousel-overlay h2 { 
            font-size: 2rem; 
        }
    }
    
    @media (max-width: 768px) {
        .led-carousel-section,
        .r5-carousel-section {
            padding: 50px 0;
        }
        .led-carousel-overlay h2 { 
            font-size: 1.6rem; 
        }
        .led-carousel-slide { 
            height: 50vh; 
            min-height: 400px;
        }
        .led-carousel-section .owl-nav button,
        .r5-carousel-section .owl-nav button {
            width: 40px;
            height: 40px;
        }
    }
    
    @media (max-width: 576px) {
        .led-carousel-overlay h2 { 
            font-size: 1.4rem; 
        }
        .led-carousel-overlay .lead {
            font-size: 0.95rem;
        }
        .led-carousel-slide { 
            min-height: 350px;
        }
    }
  
    /* R5 Carousel Slides */
    .r5-carousel     .r5-slide {
        position: relative;
        border-radius: 12px;
        overflow: hidden;
        height: 70vh;
        min-height: 420px;
    }
  
    .r5-carousel .r5-slide img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        display: block;
    }
  
    .r5-overlay {
        position: absolute;
        inset: 0;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        padding: 5% 8%;
        color: #fff;
        background: linear-gradient(
            to bottom,
            rgba(0,0,0,0.3) 0%,
            rgba(0,0,0,0.0) 40%,
            rgba(0,0,0,0.65) 100%
        );
        pointer-events: none;
    }
  
    .r5-overlay h2 {
        font-size: 2.4rem;
        font-weight: 700;
        margin: 0 0 0.75rem;
    }
  
    .r5-overlay .lead {
        font-size: 1.1rem;
        margin-bottom: 0.75rem;
        opacity: 0.9;
    }
  
    .r5-overlay .features {
        list-style: none;
        padding: 0;
        margin: 0;
        font-size: 0.95rem;
    }
  
    @media (max-width: 992px) {
        .r5-carousel .r5-slide {
            height: 60vh;
            min-height: 380px;
        }
        .r5-overlay h2 {
            font-size: 2rem;
        }
    }
  
    @media (max-width: 768px) {
        .r5-carousel .r5-slide {
            height: 45vh;
            min-height: 360px;
            border-radius: 8px;
        }
        .r5-overlay {
            padding: 8% 6%;
        }
        .r5-overlay h2 {
            font-size: 1.8rem;
            text-align: center;
        }
        .r5-overlay .lead,
        .r5-overlay .features {
            font-size: 0.95rem;
            text-align: center;
        }
    }
  
  
  .led-product-section {
  background-color: #0a0a0a;
  color: #ffffff;
  overflow: hidden;
  padding: 100px 0;
  }
  
  
  /* 正文描述文字 */
  .desc-text {
  line-height: 1.6;
  max-width: 500px;
  }
  
  /* 参数数值样式 (如 15%, 30小时) */
  .stat-value {
  font-size: 2.5rem;
  font-weight: 500;
  line-height: 1;
  margin-bottom: 5px;
  }
  
  .stat-value .unit {
  font-size: 1rem;
  margin-left: 4px;
  }
  
  /* 参数标签样式 (数值下方文字) */
  .stat-label {
  font-size: 0.85rem;
  color: #888;
  }
  
  /* 图片圆角 */
  .rounded-4 {
  border-radius: 12px !important;
  }
  
  /* 响应式调整 */
  @media (max-width: 768px) {
  .stat-value {
    font-size: 2rem;
  }
  .led-product-section h2 {
    font-size: 1.5rem;
  }
  }
  
    /* hero-center-section - 全屏图 */
    .hero-center-section {
        position: relative;
        overflow: hidden;
    }
    .hero-center-section img{position: relative;width: 100%;height: 100vh;object-fit: cover;}

    .hero-center-section .content {position: absolute;top: 15%;left: 50%;transform: translate(-50%,-50%);}

    @media screen and (max-width: 768px) {
        .hero-center-section .content {position: absolute;top: 15%;left: 50%;transform: translate(-50%,-50%);width: 100%;text-align: center;}
        .hero-center-section img{position: relative;width: 100%;height: 45vh;object-fit: cover;}
    }
  /* 参数标签：灰色、小号 */
  .spec-label {
    color: #999;
    font-size: 0.85rem;
    margin-bottom: 8px;
    white-space: nowrap;
  }
  
  /* 参数主数值：大号、加粗 */
  .spec-value {
    font-size: 1.4rem;
    font-weight: 600;
    color: #1a1a1a;
  }
  
  /* 特殊长文本数值 */
  .spec-value-small {
    font-size: 1.1rem;
    font-weight: 500;
    line-height: 1.2;
  }
  
  /* 单位：减小字号 */
  .spec-value .unit {
    font-size: 0.9rem;
    font-weight: 400;
    margin-left: 2px;
  }
  
  /* Specs tab switcher (Indoor / Outdoor) */
  .specs-switch {
    display: inline-flex;
    gap: 4px;
    padding: 4px;
    border-radius: 9999px;
    background: #f2f2f2;
    border: 1px solid #e7e7e7;
  }
  
  .specs-tab {
    border: 0;
    background: transparent;
    padding: 6px 14px;
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 600;
    color: #666;
    transition: all 0.2s ease;
  }
  
  .specs-tab.is-active {
    background: #474747;
    color: #fff;
    box-shadow: 0 10px 22px rgba(0,0,0,0.12);
  }
  
  .specs-panel { display: none; }
  .specs-panel.is-active { display: block; }
  
  /* 按钮样式：仿理想官网的圆润黑按钮（支持多实例） */
  .spec-toggle-btn {
    background-color: #474747 !important;
    border: none !important;
    transition: all 0.3s ease;
  }
  
  .spec-toggle-btn:hover {
    background-color: #333 !important;
    transform: translateY(-2px);
  }
  
  /* 响应式调整 */
  @media (max-width: 768px) {
    .spec-value { font-size: 1.1rem; }
    .spec-label { font-size: 0.75rem; }
    .col-4 { margin-bottom: 1rem; }
  }
  
  /* 1 */
  .led-section {
        padding: 80px 20px 100px;
    }
    .title {
        font-size: 4.2rem;
        font-weight: 700;
        letter-spacing: -0.03em;
        line-height: 1.05;
    }
    .subtitle {
        font-size: 1.75rem;
        color: #aaaaaa;
        margin-top: -10px;
    }
    .gimbal-img {
        max-width: 420px;
        transition: transform 0.4s ease;
    }
    .gimbal-img:hover {
        transform: scale(1.02);
    }
    .feature-pill {
        background-color: #f0f0f0;
  color: #333;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  white-space: nowrap;
    }
    .price {
        font-size: 3.1rem;
        font-weight: 700;
        letter-spacing: -0.02em;
    }
    .led-section .btn-1 {
        background-color: #474747;
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 300;
  padding: 5px 10px;
  border-radius: 9999px;
  transition: all 0.3s;
  border: 1px solid #e7e7e7;
    }
    .buy-btn {
        background-color: #fff;
  color: #000;
  font-size: 1rem;
  font-weight: 600;
  padding: 10px 15px;
  border-radius: 9999px;
  transition: all 0.3s;
  border: 1px solid #e7e7e7;
    }
    .buy-btn:hover {
        transform: translateY(-3px);
        box-shadow: 0 12px 25px rgba(255,255,255,0.25);
    }
    .buy-btn svg{width: 20px;height: 20px;}
    .bottom-icon {
        margin-bottom: 16px;
        display: block;
    }
    .bottom-icon svg{
        width: 60px;
        height: 60px;
        object-fit: contain;
    }
    .bottom-qr {
        width: 132px;
        height: 132px;
        background: #fff;
        padding: 10px;
        border-radius: 16px;
        margin: 0 auto 18px;
        box-shadow: 0 4px 15px rgba(0,0,0,0.4);
    }
      .disclaimer {
        font-size: 0.85rem;
        line-height: 1.7;
        color: #999;
        max-width: 720px;
        margin: 60px auto 0;
    }
    .disclaimer ol {
        padding-left: 1.4rem;
    }
    .disclaimer li {
        margin-bottom: 12px;
    }
    hr {
        border-color: #dddddd;
        opacity: 1;
    }
  
    /* ===== 滚动浮现动画 (Scroll Reveal Animation) ===== */
    /* 基础类：初始隐藏状态 */
    .scroll-reveal {
        opacity: 0;
        transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                    transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        will-change: opacity, transform; /* 提示浏览器优化 */
    }
  
    /* 激活状态：显示 */
    .scroll-reveal.revealed {
        opacity: 1;
        transform: translateY(0) translateX(0) scale(1);
    }
  
    /* 从下方浮现 */
    .scroll-reveal-up {
        transform: translateY(40px);
    }
  
    /* 从上方浮现 */
    .scroll-reveal-down {
        transform: translateY(-40px);
    }
  
    /* 从左侧浮现 */
    .scroll-reveal-left {
        transform: translateX(-40px);
    }
  
    /* 从右侧浮现 */
    .scroll-reveal-right {
        transform: translateX(40px);
    }
  
    /* 缩放浮现 */
    .scroll-reveal-scale {
        transform: scale(0.9);
    }
  
    /* 组合效果：上浮 + 缩放 */
    .scroll-reveal-up-scale {
        transform: translateY(40px) scale(0.95);
    }
  
    /* 延迟动画（用于序列动画） */
    .scroll-reveal-delay-1 { transition-delay: 0.1s; }
    .scroll-reveal-delay-2 { transition-delay: 0.2s; }
    .scroll-reveal-delay-3 { transition-delay: 0.3s; }
    .scroll-reveal-delay-4 { transition-delay: 0.4s; }
    .scroll-reveal-delay-5 { transition-delay: 0.5s; }
    .scroll-reveal-delay-6 { transition-delay: 0.6s; }
  
    /* 响应式：移动端减少动画距离 */
    @media (max-width: 768px) {
        .scroll-reveal-up { transform: translateY(30px); }
        .scroll-reveal-down { transform: translateY(-30px); }
        .scroll-reveal-left { transform: translateX(-30px); }
        .scroll-reveal-right { transform: translateX(30px); }
    }
  
    /* 性能优化：减少动画（用户偏好） */
    @media (prefers-reduced-motion: reduce) {
        .scroll-reveal {
            transition: opacity 0.3s ease;
            transform: none !important;
        }
    }
  
    /* ===== 边距工具类库 (Margin Utility Classes) ===== */
    /* 垂直边距 (margin-top & margin-bottom) */
    .my-10 { margin-top: 10px !important; margin-bottom: 10px !important; }
    .my-20 { margin-top: 20px !important; margin-bottom: 20px !important; }
    .my-30 { margin-top: 30px !important; margin-bottom: 30px !important; }
    .my-40 { margin-top: 40px !important; margin-bottom: 40px !important; }
    .my-50 { margin-top: 50px !important; margin-bottom: 50px !important; }
    .my-60 { margin-top: 60px !important; margin-bottom: 60px !important; }
    .my-70 { margin-top: 70px !important; margin-bottom: 70px !important; }
    .my-80 { margin-top: 80px !important; margin-bottom: 80px !important; }
    .my-90 { margin-top: 90px !important; margin-bottom: 90px !important; }
    .my-100 { margin-top: 100px !important; margin-bottom: 100px !important; }
    .my-110 { margin-top: 110px !important; margin-bottom: 110px !important; }
    .my-120 { margin-top: 120px !important; margin-bottom: 120px !important; }
  
    /* 上边距 (margin-top) */
    .mt-10 { margin-top: 10px !important; }
    .mt-20 { margin-top: 20px !important; }
    .mt-30 { margin-top: 30px !important; }
    .mt-40 { margin-top: 40px !important; }
    .mt-50 { margin-top: 50px !important; }
    .mt-60 { margin-top: 60px !important; }
    .mt-70 { margin-top: 70px !important; }
    .mt-80 { margin-top: 80px !important; }
    .mt-90 { margin-top: 90px !important; }
    .mt-100 { margin-top: 100px !important; }
    .mt-110 { margin-top: 110px !important; }
    .mt-120 { margin-top: 120px !important; }
  
    /* 下边距 (margin-bottom) */
    .mb-10 { margin-bottom: 10px !important; }
    .mb-20 { margin-bottom: 20px !important; }
    .mb-30 { margin-bottom: 30px !important; }
    .mb-40 { margin-bottom: 40px !important; }
    .mb-50 { margin-bottom: 50px !important; }
    .mb-60 { margin-bottom: 60px !important; }
    .mb-70 { margin-bottom: 70px !important; }
    .mb-80 { margin-bottom: 80px !important; }
    .mb-90 { margin-bottom: 90px !important; }
    .mb-100 { margin-bottom: 100px !important; }
    .mb-110 { margin-bottom: 110px !important; }
    .mb-120 { margin-bottom: 120px !important; }
  
    /* 水平边距 (margin-left & margin-right) */
    .mx-10 { margin-left: 10px !important; margin-right: 10px !important; }
    .mx-20 { margin-left: 20px !important; margin-right: 20px !important; }
    .mx-30 { margin-left: 30px !important; margin-right: 30px !important; }
    .mx-40 { margin-left: 40px !important; margin-right: 40px !important; }
    .mx-50 { margin-left: 50px !important; margin-right: 50px !important; }
    .mx-60 { margin-left: 60px !important; margin-right: 60px !important; }
    .mx-70 { margin-left: 70px !important; margin-right: 70px !important; }
    .mx-80 { margin-left: 80px !important; margin-right: 80px !important; }
    .mx-90 { margin-left: 90px !important; margin-right: 90px !important; }
    .mx-100 { margin-left: 100px !important; margin-right: 100px !important; }
  
    /* ===== 统一 Section 标题和描述样式 ===== */
    .section-title {
        font-size: 3rem;
        font-weight: 700;
        letter-spacing: -0.03em;
        line-height: 1.15;
        margin-bottom: 1rem;
    }

    .section-desc {
        font-size: 1.15rem;
        line-height: 1.8;
        color: rgba(0, 0, 0, 0.6);
        margin-bottom: 0;
    }

    /* 深色背景下的描述文字 */
    .section-desc.text-white-50,
    .section-desc.text-white {
        color: rgba(255, 255, 255, 0.65);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
        .section-title {
            font-size: 2.25rem;
        }
        .section-desc {
            font-size: 1.05rem;
        }
    }

    @media (max-width: 768px) {
        .section-title {
            font-size: 1.85rem;
        }
        .section-desc {
            font-size: 1rem;
        }
    }
      
  .carousel-container {
    overflow: hidden;
}

.carousel-slides {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    gap: 3vw; /* slide间隙 */
}

.carousel-slides::-webkit-scrollbar {
    display: none;
}

.carousel-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.90;
    transition: opacity 0.4s;
}

.carousel-slide:hover img {
    opacity: 0.95;
}

.carousel-slide .text-upper {
    text-align: center;
}

.carousel-slide .text-lower {
    text-align: center;
}

.carousel-slide p.lead {
    font-size: 1.65rem;
    opacity: 0.95;
    margin: 0 0 1.5rem;
    line-height: 1.5;
}

.carousel-slide .features {
    font-size: 1.2rem;
    opacity: 0.92;
    list-style: none;
    padding: 0;
    margin: 0;
}

.carousel-slide .features li {
    margin-bottom: 0.7rem;
}

/* 底部控件：箭头 + 长条指示器 在同一行 */
.carousel-bottom-controls {
    position: absolute;
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 60px;
    z-index: 10;
}

.carousel-bottom-controls .carousel-control-prev,
.carousel-bottom-controls .carousel-control-next {
    width: 56px;
    height: 56px;
    background: rgb(0 0 0 / 44%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
    transition: all 0.3s;
}

.carousel-bottom-controls .carousel-control-prev:hover,
.carousel-bottom-controls .carousel-control-next:hover {
    background: rgba(255,255,255,0.3);
    transform: scale(1.1);
}

.carousel-indicators-bar {
    display: flex;
    gap: 12px;
}

.carousel-indicators-bar .indicator-bar {
    width: 48px;
    height: 4px;
    background: rgba(0, 0, 0, 0.35);
    border-radius: 2px;
    transition: all 0.4s ease;
}

.carousel-indicators-bar .indicator-bar.active {
    width: 80px; /* 激活时拉长，更明显 */
    background: rgb(0, 0, 0);
}

/* 响应式 */
@media (max-width: 1200px) {
    .carousel-slide { flex: 0 0 70%; max-width: 70%; }
    .carousel-slide h2 { font-size: 4rem; }
}

@media (max-width: 992px) {
    .carousel-slide { 
        flex: 0 0 85%; 
        max-width: 85%; 
        height: 70vh; 
    }
    .carousel-bottom-controls { gap: 40px; bottom: 40px; }
    .carousel-indicators-bar .indicator-bar { width: 36px; }
    .carousel-indicators-bar .indicator-bar.active { width: 60px; }
}

@media (max-width: 768px) {
    .carousel-slide { 
        flex: 0 0 100%; 
        max-width: 100%; 
        height: 65vh; 
        border-radius: 8px;
    }
    .carousel-slide h2 { font-size: 3.2rem; }
    .carousel-slide p.lead { font-size: 1.4rem; }
    .carousel-bottom-controls { gap: 30px; }
    .carousel-control-prev, .carousel-control-next { width: 48px; height: 48px; }
}
/* =========================
LED UI INTERACTION SECTION
========================= */
.led-ui-interaction {
    background-color: #000;
    color: #fff;
    padding: 120px 0;
}
.led-ui-interaction.tab-white-bg {
    background-color: #fafafa;
    color: #000;
}
.led-ui-interaction.tab-white-bg .section-title {
    color: #000;
}
.led-ui-interaction.tab-white-bg .section-desc {
    color: rgba(0, 0, 0, 0.55);
}
.led-ui-interaction.tab-white-bg .highlight {
    color: #ff9d00;
}
.led-ui-interaction.tab-white-bg .tabs-wrapper {
    border-bottom: 1px solid #e5e5e5;
}
.led-ui-interaction.tab-white-bg .tab-item {
    color: #666;
}
.led-ui-interaction.tab-white-bg .tab-item.active {
    color: #000;
}
.led-ui-interaction.tab-white-bg .tab-item.active::after {
    background-color: #000;
}
.led-ui-interaction.tab-white-bg .desc-content {
    color: rgba(0, 0, 0, 0.6);
}
.led-ui-interaction.tab-white-bg .desc-content.active {
    color: #000;
}
.led-ui-interaction .section-title {
    font-size: 2.75rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.led-ui-interaction .section-desc {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.75;
}

.led-ui-interaction .highlight {
    color: #ff9d00;
}

.led-ui-interaction .image-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    border-radius: 12px;
    margin-bottom: 3rem;
}

.led-ui-interaction .main-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.6s ease-in-out;
    opacity: 0;
}

.led-ui-interaction .main-img.active {
    opacity: 1;
}

.led-ui-interaction .desc-wrapper {
    position: relative;
    min-height: 80px;
    margin-top: 1.5rem;
}

.led-ui-interaction .desc-content {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 560px;
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.7;
    text-align: center;
    opacity: 0;
    transition: opacity 0.5s ease;
    pointer-events: none;
}

.led-ui-interaction .desc-content.active {
    opacity: 1;
    pointer-events: auto;
}

.led-ui-interaction .tabs-wrapper {
    display: flex;
    justify-content: center;
    border-bottom: 1px solid #333;
    margin-bottom: 2rem;
}

.led-ui-interaction .tab-item {
    position: relative;
    padding: 14px 32px;
    font-size: 0.95rem;
    font-weight: 500;
    color: #888;
    cursor: pointer;
    transition: all 0.3s ease;
}

.led-ui-interaction .tab-item.active {
    color: #fff;
    font-weight: 600;
}

.led-ui-interaction .tab-item.active::after {
    content: "";
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: #fff;
}

@media (max-width: 767px) {
    .led-ui-interaction {
        padding: 80px 0;
    }
    .led-ui-interaction .section-title {
        font-size: 2rem;
        text-align: center;
    }
    .led-ui-interaction .section-desc {
        max-width: none;
        text-align: center;
        margin-top: 1rem;
    }
    .led-ui-interaction .tab-item {
        padding: 12px 8px;
        font-size: 0.8rem;
        text-align: center;
        border-bottom: 1px solid #333;
    }
    .led-ui-interaction.tab-white-bg .tab-item {
        font-size: 0.75rem;
    }
    .led-ui-interaction .tab-item.active::after {
        bottom: 0;
    }
    .led-ui-interaction .image-container {
        border-radius: 8px;
    }
}
/* =========================
R5 CORE SECTION (REPLACE ALL)
Scope: .family-ai-section.r5-core-section
========================= */

/* =========================
Lixiang-like layout for R5
No radius, white background, clean typography
========================= */

.led-section{
background:#fff;
color:#000;
padding: 110px 0 120px;
}

.led-section .r5-head{
max-width: 980px;
margin-bottom: 40px;
text-align: left; 
}

.led-section .r5-title{
font-size: 56px;
line-height: 1.12;
letter-spacing: -0.02em;
font-weight: 700;
margin: 0 0 16px;
}

.led-section .r5-desc{
font-size: 18px;
line-height: 1.8;
color: rgba(0,0,0,0.65);
margin: 0;
}

/* 3 info columns */
.led-section .r5-info{
display: grid;
grid-template-columns: repeat(3, minmax(0, 1fr));
gap: 28px;
max-width: 1180px;
margin: 0 auto 48px;
text-align: left;
}

.led-section .r5-info-item{
padding-top: 6px;
}

.led-section .r5-info-kicker{
font-size: 12px;
font-weight: 700;
letter-spacing: 0.06em;
text-transform: uppercase;
color: rgba(255,140,0,0.95); /* 你喜欢也可以改成黑灰 */
margin-bottom: 10px;
}

.led-section .r5-info-title{
font-size: 26px;
font-weight: 700;
letter-spacing: -0.01em;
margin: 0 0 8px;
}

.led-section .r5-info-sub{
font-size: 14px;
line-height: 1.75;
color: rgba(0,0,0,0.60);
margin: 0;
}

/* Media grid: left big + right stacked */
.led-section .r5-media-grid{
display: grid;
grid-template-columns: 1fr 1fr;
gap: 28px;
align-items: stretch;
max-width: 1180px;
margin: 0 auto;
}

.led-section .r5-stack{
display: grid;
grid-template-rows: 1fr 1fr;
gap: 28px;
height: 100%;
}

/* Media figure: no rounded, no card look */
.led-section .r5-media{
margin: 0;
width: 100%;
height: 100%;
background: #000;
overflow: hidden;     /* 关键：无圆角也需要裁切 */
border-radius: 0;     /* 明确无圆角 */
}

/* give baseline height like Lixiang (big visual block) */
.led-section .led-media--big{
min-height: 700px;
}

.led-section .led-media--small{
min-height: 296px;
}

.led-section .r5-media img{
width: 100%;
height: 100%;
object-fit: cover;
display: block;
}

/* Caption under image (like Lixiang small title + desc) */
.led-section .r5-cap{
padding: 14px 0 0;
background: transparent;
text-align: left;
}

.led-section .r5-cap-title{
font-size: 16px;
font-weight: 700;
letter-spacing: -0.01em;
margin: 0 0 6px;
color: rgba(0,0,0,0.88);
}

.led-section .r5-cap-desc{
font-size: 13px;
line-height: 1.75;
margin: 0;
color: rgba(0,0,0,0.58);
}

/* r5-lixiang 主题预设：bg-black 黑色背景 */
.led-section.bg-black {
background: #000;
color: #fff;
}
.led-section.bg-black .r5-desc { color: rgba(255,255,255,0.65); }
.led-section.bg-black .r5-info-kicker { color: rgba(255,180,80,0.95); }
.led-section.bg-black .r5-info-sub { color: rgba(255,255,255,0.60); }
.led-section.bg-black .r5-cap-title { color: rgba(255,255,255,0.88); }
.led-section.bg-black .r5-cap-desc { color: rgba(255,255,255,0.58); }

/* r5-lixiang 主题预设：bg-white 白色背景（默认） */
.led-section.bg-white {
background: #fff;
color: #000;
}

/* Responsive */
@media (max-width: 992px){
.led-section{
padding: 90px 0 96px;
}

.led-section .r5-title{
font-size: 42px;
}

.led-section .r5-info{
grid-template-columns: 1fr;
gap: 18px;
margin-bottom: 34px;
}

.led-section .r5-media-grid{
grid-template-columns: 1fr;
}

.led-section .led-media--big{
min-height: 520px;
}

.led-section .led-media--small{
min-height: 340px;
}
}

@media (max-width: 768px){
.led-section .r5-title{
font-size: 34px;
}
}
.led-section .r5-media{
position: relative;
}

.led-section .r5-cap{
position: absolute;
left: 28px;
bottom: 22px;
max-width: 70%;
background: transparent;
padding: 0;
}

.led-section .r5-cap-title{
font-size: 18px;
font-weight: 700;
letter-spacing: -0.01em;
margin: 0 0 6px;
color: #fff;
}

.led-section .r5-cap-desc{
font-size: 13px;
line-height: 1.6;
margin: 0;
color: rgba(255,255,255,0.75);
}

/* subtle gradient to ensure readability */
.led-section .r5-media::before{
content:"";
position:absolute;
inset:0;
background: linear-gradient(
to top,
rgba(0,0,0,0.45) 0%,
rgba(0,0,0,0.25) 20%,
rgba(0,0,0,0.0) 55%
);
pointer-events:none;
}

    /* Responsive tweaks for hero & full-width banners */
    @media (max-width: 768px) {
        .led-hero-content {
            padding-top: 20vh;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }
    }

    /* Full-width background image sections with overlay text */
    @media (max-width: 768px) {
        section[style*="position: relative"] > .content h2 {
            font-size: 2.1rem !important;
            padding: 0 1.5rem;
            line-height: 1.3;
            text-align: center;
        }
        section[style*="position: relative"] > .content p {
            font-size: 1.1rem !important;
            padding: 0 1.75rem;
            line-height: 1.5;
            text-align: center;
        }
    }

    /* Reduce vertical padding for interaction sections on small screens */
    @media (max-width: 768px) {
        .led-ui-interaction {
            padding: 90px 0;
        }
    }

    /* ============================================
       HEADER 滚动变色
       ============================================ */


    /* 初始状态：深色文字 */
   
    /* 移动端 */
    @media (max-width: 992px) {
        body.inner .header .navbar-nav > .nav-item > .nav-link {
            font-size: 1.35rem;
            font-weight: 400;
            padding: 1rem;
            border-bottom: rgba(0, 0, 0, 0.12) 1px solid;
        }

        body.inner .header .navbar-nav > .nav-item > .nav-link::before {
            display: none;
        }
    }