header {
    position: fixed; top: 0; width: 100%; height: 80px; 
    background: rgba(249, 249, 251, 0.95); backdrop-filter: blur(10px);
    display: flex; justify-content: space-between; align-items: center;
    padding: 0 60px; z-index: 1000; border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}
header.nav-up { transform: translateY(-100%); }

.logo img { height: 28px; width: auto; }
.nav-menu { display: flex; gap: 40px; height: 100%; align-items: center; }
.nav-item { position: static; height: 100%; display: flex; align-items: center; cursor: pointer; font-size: 16px; font-weight: 600; text-transform: uppercase; }
.nav-item:hover { color: var(--vi-blue); }
.nav-item.cur { color: var(--vi-blue); }

/* 下拉巨型菜单 Mega Menu */
.mega-menu { 
    position: absolute; top: 80px; left: 0; width: 100vw; 
    height: 750px; 
    background: #fff; box-shadow: 0 10px 30px rgba(0,0,0,0.05); 
    opacity: 0; visibility: hidden; transition: 0.3s; 
    padding: 50px 0; 
    display: flex; flex-direction: column; align-items: center;
    cursor: default; text-transform: none; border-top: 1px solid #eee;
}
.nav-item:hover .mega-menu { opacity: 1; visibility: visible; }

.mega-categories { 
    display: flex; gap: 40px; margin-bottom: 40px; 
    width: 100%; max-width: 1600px; padding: 0 40px; justify-content: center; 
}
.mega-cat-item { font-size: 17px; font-weight: 500; color: var(--text-gray); cursor: pointer; transition: 0.3s; line-height: 1;}
.mega-cat-item:hover, .mega-cat-item.active { color: var(--vi-blue); }

.mega-products { 
    display: grid; grid-template-columns: repeat(6, 1fr); gap: 30px; 
    width: 100%; max-width: 1600px; padding: 0 40px; 
}
.mega-product-card { display: flex; flex-direction: column; align-items: center; cursor: pointer; text-align: center; }
.mega-product-card img { 
    width: 240px; height: 240px; object-fit: contain; 
    background: var(--bg-light); margin-bottom: 20px; 
    border-radius: var(--radius-sm); transition: 0.3s; padding: 20px;
}
.mega-product-card:hover img { transform: scale(1.05); }
.mega-product-card p { font-size: 16px; font-weight: 500; color: var(--text-dark); transition: 0.3s; line-height: 1;}
.mega-product-card:hover p { color: var(--vi-blue); }

/* SUPPORT 专属下拉菜单样式 */
.mega-support {
    height: auto; padding: 50px 0 60px 0; 
    border-bottom-left-radius: 12px; border-bottom-right-radius: 12px; 
}
.support-dropdown-grid {
    display: flex; gap: 120px; justify-content: center;
    width: 100%; max-width: 1200px; margin: 0 auto;
}
.support-col { display: flex; flex-direction: column; text-align: left; }
.support-col h4 {
    font-size: 18px; font-weight: 800; color: var(--text-dark);
    margin-bottom: 25px; text-transform: uppercase; letter-spacing: 0.5px;
}
.support-col h4 a { color: var(--text-dark); text-decoration: none; display: inline-block; font-weight: inherit; transition: 0.3s; }
.support-col h4 a:hover { color: var(--vi-blue); }
.support-col ul { padding: 0; list-style: none; margin: 0; }
.support-col li { margin-bottom: 18px; }
.support-col ul a { font-size: 15px; color: var(--text-gray); transition: 0.3s; font-weight: 500; }
.support-col ul a:hover { color: var(--vi-blue); }

.header-tools { display: flex; align-items: center; gap: 30px; font-weight: 600;}
.icon-btn { font-size: 18px; cursor: pointer; transition: 0.3s;}
.icon-btn:hover { color: var(--vi-blue); }

/* 汉堡菜单按钮（默认隐藏） */
.nav-toggle-input { display: none; }
.hamburger {
    display: none;
    width: 0.273rem; height: 0.212rem;
    position: relative; cursor: pointer; z-index: 1001;
    flex-shrink: 0;
}
.hamburger span {
    display: block; position: absolute; height: 2px; width: 100%;
    background: var(--text-dark); border-radius: 2px;
    transition: 0.3s; left: 0;
}
.hamburger span:nth-child(1) { top: 0; }
.hamburger span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.hamburger span:nth-child(3) { bottom: 0; }
.nav-toggle-input:checked ~ .hamburger span:nth-child(1) {
    top: 50%; transform: translateY(-50%) rotate(45deg);
}
.nav-toggle-input:checked ~ .hamburger span:nth-child(2) { opacity: 0; }
.nav-toggle-input:checked ~ .hamburger span:nth-child(3) {
    bottom: 50%; transform: translateY(50%) rotate(-45deg);
}

@media (max-width: 1366px) {
    header{padding: 0 30px;}
}
@media (max-width: 1200px) {
    .header-tools .btn-black{display: none;}
}

@media (max-width: 1024px) {
    .nav-menu{display: none;}
    .lang-switch{display: none;}
    .hamburger{display: block;}
    .header-tools {margin: 0 .2rem 0 auto;}

    #my_header_0001_0_mnav{display: block;width: 100%;height: 0;z-index:50;left: 0;right: 0;top: 80px; background: #fff;overflow-y: auto;/*border-top: 1px solid transparent;*/}
    #my_header_0001_0_mnav.cur{height: calc(100vh -  80px);border-top-color: #ebebeb;}

    #my_header_0001_0_mnav .one-nav{line-height:60px;}
    #my_header_0001_0_mnav .one-nav .one{cursor:pointer; margin: 0 30px;border-bottom: 1px solid #ebebeb;background: url(/module/my/header/0001/images/nav-icon1.svg) no-repeat right;}
    #my_header_0001_0_mnav .one-nav.nobg .one{background: none;}
    #my_header_0001_0_mnav .one-nav.cur .one{background-image:url(/module/my/header/0001/images/nav-icon2.svg);}
    #my_header_0001_0_mnav .one-nav.cur.nobg .one{background: none;}
    #my_header_0001_0_mnav .one-nav .one-a{font-size:18px;font-weight: 700;color:#333;}
    #my_header_0001_0_mnav .two-nav{width: 100%;background: #fefefe;padding: 0 30px;}
    #my_header_0001_0_mnav .two-nav .two{border-bottom: 1px solid #ebebeb;padding: 0 30px;}
    #my_header_0001_0_mnav .two-nav .two-a{font-size: 16px;color:#333;}

    #my_header_0001_0_mnav .lang{margin-top: 30px}
    #my_header_0001_0_mnav .lang .icon{width: 60px;height: 60px;border: 1px solid #333;font-size: 18px;color: #333;border-radius: 50%;margin: 0 15px;}
    #my_header_0001_0_mnav .lang .icon.cur{border-color: var(--mainColor);color: var(--mainColor);}
    #my_header_0001_0_mnav .lang .tit{font-size:18px;color: #333;margin-top:20px;}
}

/* ================= 992px 平板适配 ================= */
@media (max-width: 992px) {
    header {
        height: 0.606rem;
        padding: 0 0.455rem;
    }
    .logo img { height: 0.212rem; }

    .hamburger { display: block; }

    .nav-menu {
        position: fixed; top: 0.606rem; left: 0;
        width: 100%; height: calc(100vh - 0.606rem);
        background: rgba(249, 249, 251, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column; align-items: flex-start;
        gap: 0; padding: 0.303rem 0.455rem;
        overflow-y: auto; z-index: 999;
        transform: translateX(100%);
        transition: transform 0.3s ease;
        height: auto; max-height: calc(100vh - 0.606rem);
    }
    .nav-toggle-input:checked ~ .nav-menu {
        transform: translateX(0);
    }
    .nav-item {
        height: auto; padding: 0.152rem 0;
        font-size: 0.136rem; width: 100%;
        border-bottom: 1px solid rgba(0,0,0,0.05);
        position: relative;
    }
    .nav-item:hover .mega-menu {
        opacity: 0; visibility: hidden;
    }
    .mega-menu {
        position: static; width: 100%;
        height: auto; min-height: 0;
        padding: 0.227rem 0;
        box-shadow: none; border-top: none;
        display: none;
        border-radius: 0.061rem;
        margin-top: 0.076rem;
    }
    .nav-item:hover .mega-menu,
    .nav-item:active .mega-menu {
        display: flex; opacity: 1; visibility: visible;
    }
    .mega-categories {
        flex-wrap: wrap; gap: 0.152rem;
        margin-bottom: 0.227rem;
        padding: 0 0.152rem;
        justify-content: flex-start;
    }
    .mega-cat-item { font-size: 0.121rem; }
    .mega-products {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.152rem; padding: 0 0.152rem;
    }
    .mega-product-card img {
        width: 1.212rem; height: 1.212rem;
        padding: 0.106rem; margin-bottom: 0.076rem;
    }
    .mega-product-card p { font-size: 0.106rem; }

    .mega-support { padding: 0.227rem 0 0.303rem 0; }
    .support-dropdown-grid {
        flex-direction: column; gap: 0.227rem;
        padding: 0 0.152rem;
    }
    .support-col h4 { font-size: 0.136rem; margin-bottom: 0.106rem; }
    .support-col li { margin-bottom: 0.076rem; }
    .support-col a { font-size: 0.106rem; }

    .header-tools { gap: 0.152rem; margin: 0 .2rem 0 auto;}
    .icon-btn { font-size: 0.136rem; }
    .header-tools .btn-black {
        padding: 0.091rem 0.182rem;
        font-size: 0.106rem;
    }
}

/* ================= 768px 手机端适配 ================= */
@media (max-width: 768px) {
    header {
        height: 1rem;
        padding: 0 0.227rem;
    }
    .logo img { height: 0.4rem; }

    .hamburger {
        width: 0.45rem; height: 0.4rem;
    }
    .hamburger span { height: 1.5px; }

    .nav-menu {
        top: 0.545rem;
        padding: 0.152rem 0.227rem;
    }
    .nav-item {
        font-size: 0.121rem;
        padding: 0.121rem 0;
    }
    .mega-products {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.106rem;
    }
    .mega-product-card img {
        width: 0.909rem; height: 0.909rem;
        padding: 0.076rem; margin-bottom: 0.061rem;
    }
    .mega-product-card p { font-size: 0.098rem; }
    .mega-cat-item { font-size: 0.114rem; }

    .header-tools { margin-right: .3rem;}
    .icon-btn { font-size: 0.36rem; }
    .header-tools .lang-switch { font-size: 0.106rem; }
    .header-tools .btn-black {
        padding: 0.076rem 0.136rem;
        font-size: 0.098rem;
    }

    #my_header_0001_0_mnav{top: 1rem;}
    #my_header_0001_0_mnav.cur{height: calc(100vh -  1rem);}
    #my_header_0001_0_mnav .one-nav{line-height: 12vw;}
    #my_header_0001_0_mnav .one-nav .one{background-size: 6%;margin: 0 5vw;}
    #my_header_0001_0_mnav .one-nav .one-a{font-size: 0.3rem;}
    #my_header_0001_0_mnav .two-nav .two-a{font-size: 0.28rem;}
    #my_header_0001_0_mnav .two-nav,
    #my_header_0001_0_mnav .two-nav .two{padding: 0 5vw;}
    #my_header_0001_0_mnav .lang{margin-top: 5vw;}
    #my_header_0001_0_mnav .lang .icon{width: 12vw;height: 12vw;font-size: .3rem;margin: 0 3vw;}
    #my_header_0001_0_mnav .lang .tit{font-size:.3rem;margin-top: 3vw;}
}

/* ================= 底部 Footer ================= */
footer { 
    background: #05122a; color: #9ba4b5; 
    display: flex; flex-direction: column; justify-content: center;padding: 80px 0 60px;
}
.footer-grid { display: grid; grid-template-columns: 2.5fr 1.2fr 1.2fr 1.2fr 2fr; gap: 40px; }
.footer-logo { margin-bottom: 30px; display: block;}
.footer-logo img { width: 210px; height: 32px; object-fit: contain; object-position: left; }
.footer-desc { line-height: 1.8; font-size: 16px; color: #9ba4b5;}
.footer-col h4 { color: #ffffff; font-size: 18px; font-weight: 600; margin-bottom: 30px; letter-spacing: 0.5px;}
.footer-col ul li { margin-bottom: 18px; }
.footer-col ul li a { transition: 0.3s; font-size: 16px; color: #9ba4b5;}
.footer-col ul li a:hover { color: #fff; }
.contact-info { margin-bottom: 35px;}
.contact-info p { font-size: 16px; color: #9ba4b5; font-weight: 500; margin-bottom: 5px;}
.contact-info span { display: block; font-size: 28px; font-weight: 700; color: #fff; letter-spacing: 1px;}
.newsletter h4 { color: #fff; margin-bottom: 15px;}
.newsletter-box { display: flex; border-bottom: 1px solid rgba(255,255,255,0.2); padding-bottom: 10px;}
.newsletter input { flex: 1; border: none; background: transparent; color: #fff; font-size: 16px; outline: none;}
.newsletter input::placeholder { color: #697a96; }
.newsletter button { background: none; border: none; color: #fff; font-size: 18px; cursor: pointer; transition: 0.3s;}
.newsletter button:hover { color: var(--vi-blue); }

.footer-bottom-wrap { margin-top: 60px; border-top: 1px solid rgba(255,255,255,0.1); padding-top: 40px; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; }
.footer-bottom p { font-size: 16px; color: #697a96;}
.social-links { display: flex; gap: 20px; }
.social-links a { color: #9ba4b5; font-size: 20px; transition: 0.3s; background: rgba(255,255,255,0.05); width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; border-radius: 50%;}
.social-links a:hover { color: #fff; background: var(--vi-blue); transform: translateY(-3px);}

/* ================= 右下角交互工具栏 ================= */
.float-tools { position: fixed; bottom: 40px; right: 40px; z-index: 999; display: flex; flex-direction: column; gap: 15px; }
.tool-btn { 
    width: 54px; height: 54px; background: #fff; border-radius: 50%; 
    box-shadow: 0 5px 20px rgba(0,0,0,0.15); display: flex; align-items: center; 
    justify-content: center; font-size: 22px; color: var(--text-dark); cursor: pointer; 
    transition: 0.3s; position: relative;
}
.tool-btn:hover { background: var(--vi-blue); color: #fff; }

.consult-expand { 
    position: absolute; bottom: 100%; left: 0; width: 100%; 
    display: flex; flex-direction: column; gap: 12px; 
    opacity: 0; visibility: hidden; transform: translateY(20px); 
    transition: var(--transition-soft); padding-bottom: 20px;
}
.consult-btn:hover .consult-expand { opacity: 1; visibility: visible; transform: translateY(0); }
.expand-icon { 
    width: 54px; height: 54px; background: #fff; border-radius: 50%; 
    display: flex; align-items: center; justify-content: center; 
    color: var(--text-dark); box-shadow: 0 5px 15px rgba(0,0,0,0.1); transition: 0.3s;
}
.expand-icon:hover { background: var(--vi-blue); color: #fff; transform: scale(1.1); }

.weixin .qrcode{width: 120px;height: 120px;background-color: #fff;padding: 10px;position: absolute;top: 0;right: 60px;}
.weixin:hover .qrcode{display: block;}

#backToTop { opacity: 0; visibility: hidden; transform: translateY(20px); }
#backToTop.show { opacity: 1; visibility: visible; transform: translateY(0); }

@media (max-width: 1024px) {
    .float-tools{display: none;}
}

/* ================= 992px 平板适配 ================= */
@media (max-width: 992px) {
    footer {
        padding: 0.606rem 0 0.455rem;
    }
    .container-1600 { padding: 0 0.303rem; }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.303rem;
    }
    .footer-logo { margin-bottom: 0.227rem; }
    .footer-logo img { width: 1.591rem; height: 0.242rem; }
    .footer-desc { font-size: 0.121rem; line-height: 1.8; }
    .footer-col h4 { font-size: 0.136rem; margin-bottom: 0.227rem; }
    .footer-col ul li { margin-bottom: 0.136rem; }
    .footer-col ul li a { font-size: 0.121rem; }

    .contact-info { margin-bottom: 0.265rem; }
    .contact-info p { font-size: 0.121rem; margin-bottom: 0.038rem; }
    .contact-info span { font-size: 0.212rem; letter-spacing: 0.008rem; }

    .newsletter h4 { margin-bottom: 0.114rem; }
    .newsletter input { font-size: 0.121rem; }
    .newsletter button { font-size: 0.136rem; }

    .footer-bottom-wrap { margin-top: 0.455rem; padding-top: 0.303rem; }
    .footer-bottom p { font-size: 0.121rem; }
    .social-links { gap: 0.152rem; }
    .social-links a {
        font-size: 0.152rem; width: 0.303rem; height: 0.303rem;
    }

    .float-tools { bottom: 0.303rem; right: 0.303rem; gap: 0.114rem; }
    .tool-btn { width: 0.409rem; height: 0.409rem; font-size: 0.167rem; }
    .expand-icon { width: 0.409rem; height: 0.409rem; }
    .weixin .qrcode { width: 0.909rem; height: 0.909rem; right: 0.455rem; }
}



/* ================= 768px 手机端适配 ================= */
@media (max-width: 768px) {
    footer {
        padding: 0.455rem 0 0.364rem;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 0.2rem;
    }
    .footer-logo { margin-bottom: 0.182rem; }
    .footer-logo img { width: 2.364rem; height: 0.412rem; }
    .footer-desc { font-size: 0.26rem; line-height: 1.7; }
    .footer-col { margin-bottom: 0.152rem; }
    .footer-col h4 { font-size: 0.32rem; margin-bottom: 0.182rem; }
    .footer-col ul li { margin-bottom: 0.25rem; }
    .footer-col ul li a { font-size: 0.28rem; }

    .contact-info { margin-bottom: 0.227rem; }
    .contact-info p { font-size: 0.26rem; margin-bottom: .1rem;}
    .contact-info span { font-size: 0.32rem; }

    .newsletter-box { padding-bottom: 0.2rem; }
    .newsletter input { font-size: 0.3rem; }

    .footer-bottom-wrap { margin-top: 0.303rem; padding-top: 0.227rem; }
    .footer-bottom {
        flex-direction: column; gap: 0.227rem;
        align-items: flex-start;
    }
    .footer-bottom p { font-size: 0.26rem; line-height: 1.6;}
    .footer-bottom a { font-size: 0.26rem; }
    .social-links { gap: 0.121rem; flex-wrap: wrap; }
    .social-links a {
        width: 0.333rem; height: 0.333rem; font-size: 0.152rem;
    }

    .float-tools { bottom: 0.227rem; right: 0.227rem; gap: 0.091rem; }
    .tool-btn { width: 0.364rem; height: 0.364rem; font-size: 0.152rem; }
    .expand-icon { width: 0.364rem; height: 0.364rem; }
}
/* ================= 2. 左侧导航边栏 ================= */
.support-sidebar {
    width: 320px;
    flex-shrink: 0;
    position: sticky;
    top: 120px; 
    background: #ffffff;
    border: 1px solid rgba(0,0,0,0.05);
    border-radius: 8px;
    padding: 40px 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.02);
}

.sidebar-group { margin-bottom: 40px; }
.sidebar-group:last-child { margin-bottom: 0; }

.sidebar-title {
    font-size: 16px;
    font-weight: 800;
    color: var(--text-gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 15px;
    padding-left: 15px;
}

.sidebar-nav { list-style: none; padding: 0; margin: 0; }
.sidebar-nav li { margin-bottom: 4px; }
.sidebar-nav a {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    font-size: 15px;
    font-weight: 400; 
    color: var(--text-dark);
    text-decoration: none;
    transition: all 0.3s ease;
    border-radius: 6px;
}
.sidebar-nav a::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    background-color: #d1d5db;
    border-radius: 50%;
    margin-right: 12px;
    flex-shrink: 0;
}
.sidebar-nav a:hover { color: var(--vi-blue); background: rgba(0, 96, 191, 0.03); }
.sidebar-nav a.active { color: var(--vi-blue); font-weight: 600; background: rgba(0, 96, 191, 0.06); }

/* ================= 响应式 ================= */

/* 1680px */
@media (max-width: 1680px) {
    .support-sidebar { width: 300px; padding: 35px 25px; }
}

/* 1536px */
@media (max-width: 1536px) {
    .support-sidebar { width: 280px; padding: 30px 22px; }
    .sidebar-title { font-size: 15px; margin-bottom: 12px; }
    .sidebar-nav a { font-size: 14px; padding: 10px 14px; }
}

/* 1440px */
@media (max-width: 1440px) {
    .support-sidebar { width: 260px; padding: 28px 20px; }
    .sidebar-group { margin-bottom: 30px; }
    .sidebar-title { font-size: 14px; margin-bottom: 10px; padding-left: 12px; }
    .sidebar-nav a { font-size: 13px; padding: 9px 12px; }
    .sidebar-nav a::before { width: 5px; height: 5px; margin-right: 10px; }
}

/* 1366px */
@media (max-width: 1366px) {
    .support-sidebar { width: 240px; padding: 25px 18px; }
    .sidebar-group { margin-bottom: 25px; }
    .sidebar-title { font-size: 13px; margin-bottom: 8px; padding-left: 10px; letter-spacing: 0.8px; }
    .sidebar-nav li { margin-bottom: 2px; }
    .sidebar-nav a { font-size: 12px; padding: 8px 10px; }
    .sidebar-nav a::before { width: 4px; height: 4px; margin-right: 8px; }
}

/* 1280px */
@media (max-width: 1280px) {
    .support-sidebar { width: 220px; padding: 22px 16px; }
    .sidebar-group { margin-bottom: 22px; }
    .sidebar-title { font-size: 12px; margin-bottom: 8px; padding-left: 10px; }
    .sidebar-nav a { font-size: 12px; padding: 8px 10px; }
}

/* 1024px */
@media (max-width: 1024px) {
    .support-sidebar { width: 100%; position: relative; top: 0; padding: 20px; }
    .sidebar-group { margin-bottom: 15px; }
    .sidebar-title { margin-bottom: 8px; }
}

/* 992px */
@media (max-width: 992px) {
    .support-sidebar { padding: .182rem .152rem; }
    .sidebar-group { margin-bottom: .182rem; }
    .sidebar-title { font-size: 0.121rem; margin-bottom: .076rem; padding-left: .091rem; letter-spacing: 0.008rem; }
    .sidebar-nav li { margin-bottom: .015rem; }
    .sidebar-nav a { font-size: 0.114rem; padding: .076rem .091rem; }
    .sidebar-nav a::before { width: .045rem; height: .045rem; margin-right: .076rem; }
}

/* 768px */
@media (max-width: 768px) {
    .support-sidebar { padding: .4rem .3rem; }
    .sidebar-group { margin-bottom: .152rem; }
    .sidebar-title { font-size: 0.3rem; margin-bottom: .061rem; padding-left: .076rem; letter-spacing: 0.008rem; }
    .sidebar-nav li { margin-bottom: .015rem; }
    .sidebar-nav a { font-size: 0.26rem; padding: .2rem; }
    .sidebar-nav a::before { width: .061rem; height: .061rem; margin-right: .091rem; }
}
.pdp-breadcrumbs-wrapper { width: 100%; padding-bottom: 30px; text-align: left; }
.breadcrumbs { display: flex; align-items: center; gap: 10px; font-size: 14px; font-weight: 600; color: var(--text-gray); }
.breadcrumbs a { transition: color 0.3s; color: var(--text-gray); text-decoration: none; }
.breadcrumbs a:hover { color: var(--vi-blue); }
.breadcrumbs .separator { color: rgba(0,0,0,0.3); font-size: 12px; }
.breadcrumbs .current { color: var(--text-dark); }

@media (max-width: 992px) {
    .pdp-breadcrumbs-wrapper{display: none;}
}


.page-downloads {
    min-height: 100vh;
    background: var(--bg-white);
    padding-top: 80px; 
}

/* ================= 1. 核心排版框架 (严格 1600px 居中) ================= */
.support-layout {
    display: flex;
    justify-content: center;
    gap: 60px;
    padding: 60px 40px 100px 40px; 
    max-width: 1600px; 
    margin: 0 auto; 
    align-items: flex-start;
}


/* ================= 3. 右侧内容区 ================= */
.support-content {
    flex-grow: 1; 
    min-width: 0; 
    max-width: 1140px; 
    text-align: left;
}

.page-title {
    font-size: 42px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 15px;
    letter-spacing: -0.5px;
    line-height: 1.3;
}
.page-subtitle {
    font-size: 18px;
    color: var(--text-gray);
    margin-bottom: 40px;
    line-height: 1.6;
}

/* ================= 4. 下载筛选器 ================= */
.download-filters {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
    background: rgba(0,0,0,0.02);
    padding: 25px 30px;
    border-radius: 8px;
    border: 1px solid rgba(0,0,0,0.05);
}

.filter-group {
    flex: 1;
    display: flex;
    flex-direction: column;
}
.filter-group label {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-dark);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px;
}
.filter-group select {
    width: 100%;
    padding: 16px 20px;
    font-size: 15px;
    font-family: 'Montserrat', sans-serif;
    border: 1px solid rgba(0,0,0,0.15);
    border-radius: 6px;
    outline: none;
    transition: all 0.3s ease;
    background: #ffffff;
    color: var(--text-dark);
    cursor: pointer;
    appearance: none; /* 移除默认下拉箭头 */
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 320 512'%3E%3Cpath fill='%23666' d='M137.4 374.6c12.5 12.5 32.8 12.5 45.3 0l128-128c9.2-9.2 11.9-22.9 6.9-34.9s-16.6-19.8-29.6-19.8L32 192c-12.9 0-24.6 7.8-29.6 19.8s-2.2 25.7 6.9 34.9l128 128z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 20px center;
    background-size: 12px;
}
.filter-group select:focus {
    border-color: var(--vi-blue);
    box-shadow: 0 0 0 4px rgba(0, 96, 191, 0.08);
}

/* ================= 5. 下载文件列表 ================= */
.download-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.download-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 25px 30px;
    background: #ffffff;
    border: 1px solid rgba(0,0,0,0.06);
    border-radius: 8px;
    transition: all 0.3s ease;
}
.download-item:hover {
    border-color: rgba(0, 96, 191, 0.3);
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
    transform: translateY(-2px);
}

.item-main {
    display: flex;
    align-items: center;
    gap: 20px;
}
.item-icon {
    width: 50px;
    height: 50px;
    background: rgba(0, 96, 191, 0.05);
    color: var(--vi-blue);
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    flex-shrink: 0;
}
.item-text h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 5px;
}
.item-meta {
    font-size: 13px;
    color: var(--text-gray);
    font-weight: 500;
}
.item-meta span {
    display: inline-block;
    margin-right: 15px;
}
.item-meta i {
    margin-right: 5px;
    color: rgba(0,0,0,0.3);
}

.btn-download {
    background: rgba(0,0,0,0.05);
    color: var(--text-dark);
    padding: 12px 25px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 700;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}
.btn-download:hover {
    background: var(--vi-blue);
    color: #ffffff;
}

/* 无结果提示 */
.no-results {
    text-align: left;
    padding: 30px 0;
    font-size: 16px;
    color: var(--text-gray);
}

/* ================= 响应式 ================= */

/* 1680px */
@media (max-width: 1680px) {
    .support-layout { padding: 50px 40px 90px; gap: 50px; }
}

/* 1536px */
@media (max-width: 1536px) {
    .support-layout { padding: 45px 35px 85px; gap: 45px; }
    .page-title { font-size: 40px; }
    .page-subtitle { margin-bottom: 35px; }
    .download-filters { padding: 22px 28px; }
    .download-item { padding: 22px 28px; }
}

/* 1440px */
@media (max-width: 1440px) {
    .support-layout { padding: 40px 30px 80px; gap: 40px; }
    .page-title { font-size: 38px; }
    .page-subtitle { font-size: 16px; margin-bottom: 30px; }
    .download-filters { gap: 18px; padding: 20px 25px; margin-bottom: 35px; }
    .filter-group label { font-size: 12px; margin-bottom: 8px; }
    .filter-group select { font-size: 14px; padding: 14px 18px; }
    .download-list { gap: 12px; }
    .download-item { padding: 22px 25px; }
    .item-text h3 { font-size: 16px; }
    .item-meta { font-size: 12px; }
    .item-meta span { margin-right: 12px; }
    .btn-download { font-size: 13px; padding: 10px 22px; }
}

/* 1366px */
@media (max-width: 1366px) {
    .support-layout { padding: 35px 25px 75px; gap: 35px; }
    .page-title { font-size: 36px; }
    .page-subtitle { font-size: 15px; margin-bottom: 28px; }
    .download-filters { gap: 15px; padding: 18px 22px; margin-bottom: 30px; }
    .filter-group label { font-size: 11px; margin-bottom: 7px; }
    .filter-group select { font-size: 13px; padding: 13px 16px; }
    .download-list { gap: 10px; }
    .download-item { padding: 20px 22px; }
    .item-icon { width: 45px; height: 45px; font-size: 22px; }
    .item-main { gap: 18px; }
    .item-text h3 { font-size: 15px; }
    .item-meta { font-size: 11px; }
    .btn-download { font-size: 12px; padding: 10px 20px; }
}

/* 1280px */
@media (max-width: 1280px) {
    .support-layout { padding: 30px 20px 70px; gap: 30px; }
    .page-title { font-size: 34px; }
    .page-subtitle { font-size: 14px; margin-bottom: 25px; }
    .download-filters { gap: 12px; padding: 15px 20px; margin-bottom: 25px; }
    .filter-group label { font-size: 10px; margin-bottom: 6px; }
    .filter-group select { font-size: 12px; padding: 12px 15px; }
    .download-list { gap: 8px; }
    .download-item { padding: 18px 20px; }
    .item-icon { width: 42px; height: 42px; font-size: 20px; }
    .item-main { gap: 15px; }
    .item-text h3 { font-size: 14px; }
    .item-meta { font-size: 11px; }
    .btn-download { font-size: 12px; padding: 9px 18px; }
    .no-results { font-size: 14px; padding: 25px 0; }
}

/* 1024px */
@media (max-width: 1024px) {
    .support-layout { flex-direction: column; padding: 40px 20px; }
    .support-sidebar { width: 100%; position: relative; top: 0; }
}

/* 992px */
@media (max-width: 992px) {
    .page-downloads { padding-top: .606rem; }
    .support-layout { padding: .303rem .152rem .606rem; gap: .303rem; }
    .page-title { font-size: 0.318rem; }
    .page-subtitle { font-size: 0.136rem; margin-bottom: .227rem; }
    .download-filters { padding: .152rem; gap: .114rem; margin-bottom: .303rem; }
    .filter-group label { font-size: 0.098rem; margin-bottom: .076rem; }
    .filter-group select { font-size: 0.114rem; padding: 0.121rem 0.152rem; }
    .download-list { gap: .114rem; }
    .download-item { padding: .182rem .152rem; gap: .121rem; }
    .item-icon { width: .379rem; height: .379rem; font-size: .182rem; }
    .item-main { gap: .152rem; }
    .item-text h3 { font-size: 0.136rem; margin-bottom: .038rem; }
    .item-meta { font-size: 0.098rem; margin-bottom: .076rem; }
    .item-meta span { margin-right: .114rem; }
    .btn-download { font-size: 0.106rem; padding: 0.091rem 0.182rem; }
}

/* 768px */
@media (max-width: 768px) {
    .page-downloads { padding-top: 1rem; }
    .support-layout { padding: 0.303rem 4% 0.606rem; gap: 0.227rem; }
    .page-title { font-size: 0.32rem; }
    .page-subtitle { font-size: 0.26rem; margin-bottom: 0.227rem; }
    .download-filters { flex-direction: column; padding: 0.3rem; gap: 0.121rem; margin-bottom: 0.227rem; }
    .filter-group label { font-size: 0.26rem; margin-bottom: 0.076rem; }
    .filter-group select { font-size: 0.26rem; padding: 0.121rem 0.152rem; }
    .download-list { gap: 0.2rem; }
    .download-item { flex-direction: column; align-items: flex-start; gap: 0.2rem; padding: .3rem; }
    .item-icon { width: 0.6rem; height: 0.6rem; font-size: 0.242rem; }
    .item-main { gap: 0.2rem; }
    .item-text h3 { font-size: 0.3rem; margin-bottom: 0.2rem; }
    .item-meta { font-size: 0.26rem; margin-bottom: 0.121rem; }
    .item-meta span { margin-right: 0.121rem; }
    .btn-download { width: 100%; justify-content: center; font-size: 0.26rem; padding: .2rem 0.121rem; gap: 0.076rem; }
    .no-results { font-size: 0.26rem; padding: 0.227rem 0; }
}