.header_main{
    width: 100%;
    background: transparent !important;
    display: flex;
    align-items: center;
    justify-content: space-between;
    /* Noi dung toi da 1444px o giua; man hep van giu le 140px */
    padding: 50px max(140px, calc((100% - 1444px) / 2));
    box-sizing: border-box;
    min-width: auto;
    height: auto;
    z-index: 9990;
    opacity: 1;
}

/*
 * Trang chu (header-overlay): header nam de len banner, khong chiem khoi trang.
 * z-index cao de khong bi Elementor/banner che. Khong dung AOS tren header
 * (AOS de opacity:0 neu chua init -> header "bien mat").
 */
body.header-overlay #header_main{
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    background: transparent !important;
    z-index: 9990;
    opacity: 1 !important;
    transform: none !important;
    visibility: visible !important;
    pointer-events: auto;
}
body.admin-bar.header-overlay #header_main{
    top: 32px;
}
@media screen and (max-width: 782px){
    body.admin-bar.header-overlay #header_main{
        top: 46px;
    }
}
.header_main .logo{
    position: initial;
    padding: 0;
    flex-shrink: 0;
}
.header_main .logo img.img1{width:75px; height:auto; display:block;}
#header_main #nav_main{width:auto;float:initial;margin-right:0; flex:0 1 auto; min-width:0; display:flex; justify-content:flex-end;}
#header_main #nav_main .nav{height:auto; display:flex; flex-wrap:wrap; justify-content:flex-end;}
#header_main #nav_main .nav li{height:auto;}
#header_main #nav_main .nav li:hover a.aLink, #header_main #nav_main .nav li.hover a.aLink {
    background-color: transparent;color:#7091D9!important;
}
#header_main #nav_main .nav li a.aLink{
    font-family: "方正兰亭黑Pro GBK_DemiBlod", "Microsoft YaHei", sans-serif;
    border-radius:0;
    color: #333;
    transition:all 1s cubic-bezier(0.4,0.8,0.74,1);
    margin-top:0;
    overflow:visible;
}
/* Menu con: rong theo chu, khong xuong dong */
#header_main #nav_main .nav li > ul,
#header_main #nav_main .nav li ul.sub-menu,
#header_main #nav_main .nav .subnav{
    left: 50%;
    right: auto;
    margin-left: 0;
    top: 100%;
    width: max-content !important;
    min-width: 200px;
    max-width: min(360px, 90vw);
    transform: translate3d(-50%, 10px, 0);
    white-space: nowrap;
    box-sizing: border-box;
}
#header_main #nav_main .nav li:hover > ul,
#header_main #nav_main .nav li.hover > ul{
    transform: translate3d(-50%, 0, 0);
}
#header_main #nav_main .nav li ul li a {color: #333;}
#header_main #nav_main .nav li ul li{
    background-color: transparent !important;
    border-bottom: #e3e3e3 solid 1px !important;
    height: auto !important;
    width: 100% !important;
    min-width: 100%;
    float: none !important;
    clear: both;
    white-space: nowrap;
}
#header_main #nav_main .nav li ul li a{
    background-color: white !important;
    height: auto !important;
    line-height: 1.4 !important;
    padding: 12px 20px !important;
    width: 100% !important;
    white-space: nowrap !important;
    overflow: visible !important;
    text-overflow: clip;
    box-sizing: border-box;
    text-align: center;
    display: block;
}
#header_main #nav_main .nav li ul li:hover a{
    color:#7091D9!important;background-color:white !important;
    font-family: "方正兰亭黑Pro GBK_DemiBlod", "Microsoft YaHei", sans-serif;
}

/* Menu cap 3: hien ke ben muc cap 2 khi hover */
@media (min-width: 992px){
    #header_main #nav_main .nav > li > ul{ overflow: visible; }
    #header_main #nav_main .nav li ul li.has-sub{ position: relative; }
    #header_main #nav_main .nav li ul li.has-sub > a{ padding-right: 34px !important; }
    #header_main #nav_main .nav li ul li.has-sub > a::after{
        content: "";
        position: absolute;
        right: 14px;
        top: 50%;
        width: 6px;
        height: 6px;
        border-top: 1px solid currentColor;
        border-right: 1px solid currentColor;
        transform: translateY(-50%) rotate(45deg);
    }
    #header_main #nav_main .nav li:hover ul li > ul,
    #header_main #nav_main .nav li ul li > ul{
        left: 100%;
        top: 0;
        min-width: 180px;
        opacity: 0;
        visibility: hidden;
        transform: translate3d(10px, 0, 0);
        box-shadow: 0 6px 18px rgba(0,0,0,.08);
        z-index: 200;
    }
    #header_main #nav_main .nav li ul li:hover > ul{
        opacity: 1;
        visibility: visible;
        transform: translate3d(0, 0, 0);
    }
    /* 2 muc cuoi menu: bung sang trai de khong tran man hinh */
    #header_main #nav_main .nav > li:nth-last-child(-n+2) ul li > ul{
        left: auto;
        right: 100%;
        transform: translate3d(-10px, 0, 0);
    }
    #header_main #nav_main .nav > li:nth-last-child(-n+2) ul li:hover > ul{
        transform: translate3d(0, 0, 0);
    }
    #header_main #nav_main .nav li ul li:hover li a{
        color: #333 !important;
        font-family: inherit;
    }
    #header_main #nav_main .nav li ul li li:hover > a{
        color: #7091D9 !important;
        font-family: "方正兰亭黑Pro GBK_DemiBlod", "Microsoft YaHei", sans-serif;
    }
}

/* Language / hotline block - can giua khoang trong giua logo va menu */
#header_main .zh_en{
    flex-shrink: 0;
    white-space: nowrap;
    font-size: 13px;
    color: #333;
    margin: 0 auto;
    padding: 0 24px;
}
#header_main .zh_en a.aLink,
#header_main .zh_en .aLink{
    color: inherit;
    font-size: inherit;
    padding: 0;
    margin: 0;
    height: auto;
    line-height: 1.4;
    display: inline;
    border-radius: 0;
    background: transparent !important;
}
body.header-overlay #header_main .zh_en,
body.header-overlay #header_main .zh_en a.aLink{
    color: #fff;
    text-shadow: 0 1px 3px rgba(0,0,0,.45);
}
body.header-overlay #header_main #nav_main .nav li a.aLink{
    color: #fff;
    text-shadow: 0 1px 3px rgba(0,0,0,.45);
}

/* Mobile hamburger — 3 gach, gach giua ngan can phai (anh 1) */
.nav-toggle{
    display: none;
    width: 44px;
    height: 44px;
    border: 0;
    background: transparent;
    padding: 10px 8px;
    cursor: pointer;
    z-index: 120;
    flex-direction: column;
    justify-content: center;
    align-items: flex-end;
    gap: 5px;
}
.nav-toggle-bar{
    display: block;
    width: 22px;
    height: 2px;
    background: #333;
    transition: transform .25s ease, opacity .25s ease, width .25s ease;
}
.nav-toggle-bar:nth-child(2){
    width: 13px;
}
body.header-overlay .nav-toggle-bar{ background: #fff; }
/* Mo menu: thanh X (hinh 2) */
.nav-toggle.is-open{
    align-items: center;
}
.nav-toggle.is-open .nav-toggle-bar{
    width: 20px;
}
.nav-toggle.is-open .nav-toggle-bar:nth-child(1){ transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open .nav-toggle-bar:nth-child(2){ opacity: 0; width: 20px; }
.nav-toggle.is-open .nav-toggle-bar:nth-child(3){ transform: translateY(-7px) rotate(-45deg); }

/* ---------- Responsive ---------- */
@media (max-width: 1200px){
    .header_main{ padding: 36px 40px; }
    .header_main .logo img.img1{ width: 90px; }
    #header_main #nav_main .nav li a.aLink{ font-size: 13px; padding: 0 10px; }
}

@media (max-width: 991px){
    .header_main{
        padding: 16px 20px;
        position: relative;
        background: rgba(255,255,255,.98);
        min-width: 0 !important;
        flex-wrap: wrap;
        box-shadow: 0 1px 0 rgba(0,0,0,.06);
    }
    body.header-overlay #header_main,
    body.header-overlay .header_main{
        background: transparent !important;
        box-shadow: none;
        position: absolute;
    }

    /* Fullscreen dark menu (hinh 2) */
    body.nav-open{
        overflow: hidden;
    }
    body.header-overlay.nav-open #header_main,
    body.header-overlay.nav-open .header_main,
    body.nav-open #header_main,
    body.nav-open .header_main{
        background: #1c1c1c !important;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 10050;
        box-shadow: none;
        max-height: none;
        height: 100vh;
        height: 100dvh;
        overflow: hidden;
        display: flex;
        flex-direction: column;
        align-items: stretch;
        padding: 16px 0;
    }
    body.admin-bar.header-overlay.nav-open #header_main,
    body.admin-bar.nav-open #header_main{
        top: 46px;
        height: calc(100vh - 46px);
        height: calc(100dvh - 46px);
    }

    /* An logo + ngon ngu khi mo menu */
    body.nav-open #header_main .logo,
    body.nav-open #header_main .zh_en{
        display: none !important;
    }
    body.nav-open .nav-toggle{
        position: absolute;
        top: 14px;
        right: 14px;
        z-index: 10060;
        margin: 0;
        order: 0;
        align-items: center;
    }
    body.nav-open .nav-toggle-bar,
    body.header-overlay.nav-open .nav-toggle-bar{
        background: #9a9a9a !important;
    }

    /* Bo lop mo cu */
    body.nav-open::before{ display: none; }

    .header_main .logo{ order: 1; }
    .nav-toggle{ display: flex; order: 3; margin-left: auto; }
    #header_main .zh_en{ display: none; }

    #header_main #nav_main{
        order: 4;
        display: none;
        width: 100%;
        flex: none;
        margin: 12px 0 0;
        padding: 4px 0 20px;
        border-top: 1px solid #eee;
        justify-content: flex-start;
        background: #fff !important;
    }
    body.nav-open #header_main #nav_main,
    body.nav-open #header_main #nav_main.is-open{
        display: flex !important;
        flex: 1 1 auto;
        align-items: center;
        justify-content: center;
        margin: 0;
        padding: 56px 0 48px;
        border: 0;
        background: transparent !important;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }
    #header_main #nav_main.is-open{
        display: block;
        background: #fff !important;
    }
    #header_main #nav_main .nav{
        display: block;
        width: 100%;
        height: auto;
        background: #fff;
    }
    body.nav-open #header_main #nav_main .nav{
        background: transparent;
        width: 100%;
        max-width: 100%;
        margin: 0 auto;
        height: auto;
    }
    #header_main #nav_main .nav > li{
        float: none;
        display: block;
        width: 100%;
        height: auto;
        padding: 0;
        border-bottom: 1px solid #ececec;
        background: #fff;
    }
    body.nav-open #header_main #nav_main .nav > li{
        background: transparent;
        border-bottom: 0;
        position: relative;
    }
    /* Gach ngan o giua (khong full man) */
    body.nav-open #header_main #nav_main .nav > li::after{
        content: "";
        display: block;
        width: 56%;
        max-width: 220px;
        margin: 0 auto;
        border-bottom: 1px solid rgba(255,255,255,.22);
    }
    body.nav-open #header_main #nav_main .nav > li:first-child{
        border-top: 0;
    }
    #header_main #nav_main .nav > li:last-child{
        border-bottom: 0;
    }
    body.nav-open #header_main #nav_main .nav > li:last-child::after{
        display: none;
    }
    #header_main #nav_main .nav li a.aLink{
        margin: 0;
        padding: 15px 8px;
        height: auto;
        line-height: 1.45;
        font-size: 15px;
        font-weight: 500;
        color: #222 !important;
        background: #fff !important;
        text-shadow: none !important;
        border-radius: 0;
    }
    body.nav-open #header_main #nav_main .nav li a.aLink,
    body.nav-open #header_main #nav_main .nav li:hover > a.aLink,
    body.nav-open #header_main #nav_main .nav li.is-sub-open > a.aLink{
        color: #fff !important;
        background: transparent !important;
        text-align: center;
        font-size: 16px;
        font-weight: 400;
        padding: 18px 24px !important;
        text-shadow: none !important;
    }
    /* Muc dang active: thanh den full ngang (hinh 2) */
    body.nav-open #header_main #nav_main .nav > li.current-menu-item > a.aLink,
    body.nav-open #header_main #nav_main .nav > li.current-menu-ancestor > a.aLink,
    body.nav-open #header_main #nav_main .nav > li.current_page_item > a.aLink{
        background: #0a0a0a !important;
        color: #fff !important;
    }
    #header_main #nav_main .nav li:hover > a.aLink,
    #header_main #nav_main .nav li.is-sub-open > a.aLink{
        color: #7091D9 !important;
        background: #f7f8fa !important;
    }
    #header_main #nav_main .nav li ul{
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none !important;
        width: 100% !important;
        min-width: 0 !important;
        max-width: none !important;
        margin: 0;
        left: auto;
        display: none;
        filter: none;
        white-space: normal;
        background: #f5f6f8 !important;
        border-top: 1px solid #e8e8e8;
        box-shadow: none;
    }
    body.nav-open #header_main #nav_main .nav li ul{
        background: transparent !important;
        border-top: 1px solid rgba(255,255,255,.1);
    }
    #header_main #nav_main .nav li.is-sub-open > ul,
    #header_main #nav_main .nav li:hover > ul{
        display: block;
    }
    #header_main #nav_main .nav li ul li{
        background: transparent !important;
        border-bottom: 1px solid #e8eaed !important;
        text-align: left;
        height: auto;
        white-space: normal;
    }
    body.nav-open #header_main #nav_main .nav li ul li{
        border-bottom: 1px solid rgba(255,255,255,.08) !important;
        text-align: center;
    }
    #header_main #nav_main .nav li ul li:last-child{
        border-bottom: 0 !important;
    }
    #header_main #nav_main .nav li ul li a{
        background: transparent !important;
        padding: 12px 12px 12px 20px !important;
        color: #444 !important;
        font-size: 14px !important;
        font-weight: 400;
        line-height: 1.45 !important;
        height: auto !important;
        white-space: normal !important;
        text-align: left;
        text-shadow: none !important;
    }
    body.nav-open #header_main #nav_main .nav li ul li a,
    body.nav-open #header_main #nav_main .nav li ul li:hover > a,
    body.nav-open #header_main #nav_main .nav li:hover li a{
        color: rgba(255,255,255,.72) !important;
        background: transparent !important;
        text-align: center;
        padding: 12px 8px !important;
        font-size: 14px !important;
    }
    #header_main #nav_main .nav li ul li a:hover,
    #header_main #nav_main .nav li ul li:hover a{
        color: #7091D9 !important;
        background: #eef1f6 !important;
    }
    /* Menu cap 3: luon hien, thut vao duoi muc cap 2 */
    #header_main #nav_main .nav li ul li > ul{
        display: block;
        border-top: 1px solid #e8eaed;
        background: #eef0f3 !important;
    }
    body.nav-open #header_main #nav_main .nav li ul li > ul{
        background: transparent !important;
        border-top: 1px solid rgba(255,255,255,.06);
    }
    #header_main #nav_main .nav li ul li li a{
        padding-left: 36px !important;
        font-size: 13px !important;
    }
    body.nav-open #header_main #nav_main .nav li ul li li a{
        padding-left: 8px !important;
        color: rgba(255,255,255,.55) !important;
    }
    #header_main #nav_main .nav li ul li:hover li a{
        color: #444 !important;
        background: transparent !important;
    }
    #header_main #nav_main .nav li ul li li:hover > a{
        color: #7091D9 !important;
        background: #e6eaf1 !important;
    }
    .header_main .logo img.img1{ width: 88px; }
}

@media (max-width: 575px){
    .header_main{ padding: 12px 16px; }
    .header_main .logo img.img1{ width: 50px; }
}