/* Reset */
*{margin:0;padding:0;box-sizing:border-box;font-family:Arial, sans-serif;}
ul{list-style:none;}
a{text-decoration:none;color:#333;}
img{max-width:100%;}
.container{width:92%;margin:0 auto;}
.section{padding:60px 0;}
.section-title{font-size: 50px;margin-bottom:32px;color:#222;}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.grid-5{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;}

/* Header */
.site-header{width: 100%;background: #fff;}
/* 首页导航：默认即半透明黑底（不再完全透明），滚动后加深到 0.95 */
.site-header.home{
    position:fixed;
    background: rgba(0,0,0,0.2);
    top:0;z-index:999;
    transition: background .3s ease;
}
.header-wrap{display:flex;justify-content:space-between;align-items:center;padding: 20px 0;}
/* 导航整体靠右，字号变大后间距相应放宽（不均分，保持成组） */
.main-nav{
    margin-left:auto;
    padding-left: 40px;
}
.main-nav ul{
    display:flex;
    gap: clamp(28px, 2.6vw, 96px);
    align-items:center;
    justify-content:flex-end;
}
/* 导航栏目字号：16px -> 18px -> 20px（累计 +4px） */
.main-nav a{color: #666; font-size: 20px;}
/* 放大镜图标保持原尺寸，避免下拉搜索框错位 */
.main-nav ul .search a{font-size:16px;}
.main-nav .active a{color:#002b62;font-weight:600;}
.site-header.home a{
    color: #fff;
}
.site-header.home a.active{color:#fff;font-weight:500;}
.mobile-menu-btn{display:none;font-size:26px;background:none;border:none;cursor:pointer;}

.main-nav ul .search{
    position: relative;
}

.main-nav ul .search form{
    position: absolute;
    right: 0;
    top: 100%;          /* 跟随放大镜图标高度自适应，图标放大也不会错位 */
    margin-top: 0;
    display: none;
}

.main-nav ul .search:hover form{
    display: block;
}

.main-nav ul .search form input{
    width: 200px;
    padding: 5px;
    border: 1px solid #ddd;
    border-radius: 5px;
    outline: none;
}
/* 滚动后添加的类名，可自定义样式 */
.site-header.scroll-active {
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    background: rgba(0,0,0,0.95);
}

/* Hero Banner */
.hero-banner{position:relative;color:#fff;display:flex;align-items:center;width:100%;overflow:hidden;}
/* Banner 大图：居中铺满，超过1920px视口自动向两侧延伸、高度等比不变形 */
.banner-bg{
    width:100%;
    overflow:hidden;
    position:relative;
}
.banner-bg a{
    display:block;
    width:100%;              /* 关键：让包裹图片的 a 撑满容器，避免收缩成图片原始宽 */
}
.banner-bg img{
    width:100%;              /* 宽度跟随视口，超宽屏自动延伸铺满 */
    height:auto;             /* 高度等比放大，不拉伸变形 */
    display:block;
    object-fit:cover;        /* 居中裁剪，保证画面不溢出 */
    object-position:center center;
}
.banner-content{
    position: absolute;
    z-index: 2;
    left: 10%;
    width: auto;
    margin-top: 5%;
    bottom: 20%;
}
.banner-content h1{font-size: 60px;margin-bottom:12px;}
.banner-content p:nth-of-type(1){
    font-size: 44px;
    margin: 10px 0;
}
.banner-content p{font-size:26px;line-height:1.6;}

/* Product Card */
.product-grid{
    display: flex;
        flex-wrap: nowrap;
    overflow: auto;
}
.card-item{border:1px solid #eee;background:#fff;min-width: 23%;}
.card-item img{
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: contain;
}
.card-img{
    height: ;
}
.card-item p{
    font-size: 18px;
    color: #444;
    margin: 8px 0;
    min-height: 40px;
    padding: 0 20px;
    line-height: 26px;
    margin-bottom: 20px;
    text-align: center;   /* 产品标题(RD01/102/103P/R105…)居中显示 */
}
.card-link{
    font-size: 16px;
    padding: 0 20px 25px;
    display: block;
    text-align: center;
}

.card-link span{
    text-decoration: underline;
    color: #888888;
}

/* Case Card */
.case-card{text-align:center;}
.case-card img{
    width: 100%;
}
.case-card p{font-size: 18px;color:#333;margin-top: 20px;padding: 0 35px;}

/* Slider */
.product-slider-section{
    /* 背景图铺满：原图 1920px 宽，no-repeat 且无定位会导致大屏右侧露白 */
    background: url("../images/b-bg.jpg") no-repeat center center / cover;
}
.slider-wrap{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;}
.slider-text h3{
    font-size: 40px;
    line-height: 1.3;
    margin-bottom: 20px;
    font-weight: normal;
}
.slider-text .btn-text{color:#666;text-decoration:underline;}
.slider-page{
    margin-top: 160px;
    color: #666;
    margin-bottom: -100px;
}

/* Camping Banner */
.camp-banner{color:#fff;position: relative; width:100%; overflow:hidden;}
/* 露营灯横幅：与顶部 banner 一致，宽度跟随视口铺满，
   超过图片原始宽度(1920px)的大屏自动向两侧延伸、高度等比不变形 */
.camp-banner > img{
    width:100%;
    height:auto;
    display:block;
    object-fit:cover;
    object-position:center center;
}
.camp-content{
    position: absolute;
    top: 20%; left: 50%; transform: translate(-50%, -50%);
    text-align: center;
}
.camp-content h2{font-size: 50px;margin-bottom:24px;line-height:1.4;}
.btn{border:1px solid #fff;color:#fff;padding:10px 24px;display:inline-block;transition: all 0.5s}
.btn:hover{border-radius: 10px;}
.btn-white{color:#333;padding:10px 35px;display:inline-block;border-radius: 20px;box-shadow: 0 0 3px 0 #333}
.center-btn{text-align:center;margin-top:32px;}

/* Blog */
.blog-card{background:#fff;position: relative;}
.blog-card-info{position: absolute;bottom: 0;width: 100%;background: rgba(0, 0, 0, 0.8);padding: 10px;font-size: 18px;}
.blog-card img{width: 100%;}
.blog-card .date{
    color:#fff;
    display:block;
    margin:6px 0;
    border-bottom: 1px solid #ddd;
    padding-bottom: 10px;
    margin-bottom: 10px;
}
.blog-card p{color:#fff;}

/* Footer */
.site-footer{background:#000000;color:#fff;padding:50px 0 20px;}
.footer-wrap{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;}
.footer-social{display:flex;gap:18px;font-size:22px;flex-wrap: wrap;max-width: 250px;justify-content: flex-end;}
.footer-social a{
    width: 65px;
    height: 65px;
    border: 1px solid #fff;
    border-radius: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}
.footer-social a i{
    font-size: 40px;
    color: #fff;
}

.footer-social a p{
    position: absolute;
    right: -49px;
    bottom: 65px;
    background: #fff;
    padding: 5px;
    box-shadow: 0 0 5px 0 #ddd;
    border-radius: 5px;
    display: none;
}

.footer-social a:hover p{
    display: block;
}

.footer-social a p img{
    width: 150px;
    max-width: inherit;
}
.footer-bottom{margin-top:40px;padding-top:20px;border-top:#333 solid 1px;font-size:13px;color:#aaa;}
.footer-bottom .container{display:flex;justify-content:space-between;flex-wrap:wrap;}
.footer-links a{color:#aaa;margin-right:14px;}
.footer-left{
    display: flex;
    gap: 30px;
    line-height: 26px;
    align-items: center;
}
.footer-left img{
    width: 136px;
    height: auto;
}

.inside-main{
    background: #f7f7f7;
}
/* 超宽屏（2K/4K）：导航栏目与间距同步放大，避免大屏上显得过小 */
@media(min-width:2200px){
    .main-nav a{font-size: 24px;}
    .main-nav ul{gap: 72px;}
    .main-nav ul .search a{font-size: 20px;}
    .header-wrap{padding: 26px 0;}
}
@media(min-width:3200px){
    .main-nav a{font-size: 30px;}
    .main-nav ul{gap: 96px;}
    .main-nav ul .search a{font-size: 26px;}
    .header-wrap{padding: 34px 0;}
    .main-nav ul .search form input{width: 260px;padding: 8px;}
}
/* Responsive Media Query */
@media(max-width:992px){
    .grid-4{grid-template-columns:repeat(2,1fr);}
    .grid-5{grid-template-columns:repeat(3,1fr);}
    .slider-wrap{grid-template-columns:1fr;}
}
@media(max-width:768px){
    .main-nav{display:none;}
    .mobile-menu-btn{display:block;}
    .grid-4{grid-template-columns:1fr;}
    .grid-5{grid-template-columns:repeat(2,1fr);}
    .hero-banner{height:420px;}
    .banner-content h1{font-size:30px;}
    .camp-banner{height:360px;}
}
@media(max-width:480px){
    .grid-5{grid-template-columns:1fr;}
    .footer-bottom{flex-direction:column;gap:10px;}
}

/* ==================== Responsive fixes (added for mobile) ==================== */
@media(max-width:992px){
    .section-title{font-size:34px;}
    .banner-content h1{font-size:42px;}
    .banner-content p:nth-of-type(1){font-size:32px;}
    .banner-content p{font-size:22px;}
    .slider-text h3{font-size:30px;}
    .camp-content h2{font-size:36px;}
    .footer-left{flex-direction:column;align-items:flex-start;gap:12px;}
}
@media(max-width:768px){
    /* 移动端导航：让展开菜单以纵向下拉形式正确显示 */
    .header-wrap{position:relative;}
    .main-nav{
        position:absolute;top:100%;left:0;right:0;
        background:#fff;z-index:999;
        box-shadow:0 4px 12px rgba(0,0,0,0.12);
    }
    .main-nav ul{flex-direction:column;gap:0;}
    .main-nav a{display:block;padding:14px 20px;color:#333 !important;border-bottom:1px solid #eee;}
    .main-nav .active a{color:#002b62 !important;}
    .main-nav ul .search{display:none;}
    /* Banner 文字：贴近底部、整宽可控 */
    /* 移动端隐藏 banner 上叠加的 HTML 文字：banner 图本身已含品牌与产品文案，避免“2”等叠字挤到中部造成不协调 */
    .banner-content{display:none;}
    /* 移动端 header 加半透明深色底：logo 与右侧菜单按钮不再悬空叠在 banner 图上 */
    .site-header.home{background:rgba(0,0,0,0.72);}
    /* 移动端 banner 图完整等比显示：宽度铺满、两侧不裁剪、高度自适应 */
    .hero-banner{height:auto;}
    .banner-bg{width:100%;}
    .banner-bg a{display:block;width:100%;}
    .banner-bg img{width:100%;height:auto;display:block;}
    /* logo 缩小50%（原图 136x80 → 显示 68x40） */
    .header-wrap .logo img{width:68px;height:auto;}
    /* header 半透明区域高度缩小50%（内边距 20px→10px） */
    .header-wrap{padding:10px 0;}
    /* banner 与下方 Products 间距缩小60%（section padding-top 60px→24px） */
    .section{padding-top:24px;}
    .section-title{font-size:28px;margin-bottom:20px;}
    .camp-content{top:50%;transform:translate(-50%,-50%);width:84%;}
    .camp-content h2{font-size:26px;line-height:1.35;}
    .slider-text h3{font-size:24px;}
    .slider-page{margin-top:24px;margin-bottom:0;}
    .card-item p{font-size:15px;padding:0 12px;line-height:22px;min-height:auto;}
    .footer-social{justify-content:flex-start;}
    .footer-left img{width:110px;}
    .blog-card-info{font-size:15px;}
}
@media(max-width:480px){
    .hero-banner{height:auto;}
    .banner-content h1{font-size:22px;}
    .banner-content p:nth-of-type(1){font-size:17px;}
    .banner-content p{font-size:14px;}
    .section-title{font-size:24px;}
    .camp-content h2{font-size:20px;}
    .slider-text h3{font-size:20px;}
    .footer-wrap{flex-direction:column;align-items:stretch;gap:24px;}
    .footer-left{width:100%;}
    .footer-social{
        width:100%;max-width:100%;
        flex-wrap:nowrap;justify-content:space-between;gap:10px;
    }
    .footer-social a{width:44px;height:44px;}
    .footer-social a i{font-size:24px;}
}