/* =========================================================
   HEADER - TIẾNG TRUNG HERO
   Một hệ thống duy nhất cho desktop, stuck và mobile.
   File được nạp sau header.css để chuẩn hóa toàn bộ cascade.
========================================================= */

:root {
    --header-height: 112px;
    --header-stuck-height: 78px;
    --header-blue: #1e73be;
    --header-blue-dark: #176b96;
    --header-navy: #123d6b;
    --header-yellow: #f5c542;
    --header-border: #d9e7ee;
    --header-soft: #f1f8fc;
    --header-text: #171717;
    --header-accent: #2387b3;
    --header-nav-font-size: var(--locked-font-header-nav, 18px);
}

.site-header {
    position: relative;
    z-index: 1000;
    width: 100%;
    min-height: 0;
    background: #ffffff;
    border-bottom: 1px solid var(--header-border);
    box-shadow: 0 4px 18px rgba(18, 39, 63, 0.045);
    font-family: "Montserrat", sans-serif;
}

.site-header__sticky-wrapper {
    position: relative;
    width: 100%;
    background: #ffffff;
}

.site-header__inner {
    width: 100%;
    min-height: var(--header-height);
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    column-gap: clamp(18px, 2vw, 32px);
    margin-inline: auto;
    padding-inline: clamp(18px, 1.8vw, 28px);
    transition: min-height 0.3s ease;
}

/* =========================================================
   BRAND
========================================================= */

.site-header .brand {
    grid-column: 1;
    min-width: 0;
    justify-self: start;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: inherit;
    text-decoration: none;
}

.site-header .brand__logo-box {
    width: max-content;
    height: auto;
    flex: 0 0 auto;
    display: inline-flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    padding: 0;
    overflow: visible;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
}

.site-header .brand .brand__logo-box .brand__logo {
    width: auto;
    height: auto;
    max-width: none;
    flex: 0 0 auto;
    aspect-ratio: auto;
    display: block;
    object-fit: contain;
}

.site-header .brand__content {
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 2px;
}

.site-header .brand__content strong {
    display: block;
    margin: 0;
    color: var(--header-navy);
    font-size: 16px;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: 0;
    white-space: nowrap;
}

.site-header .brand__content small {
    display: block;
    margin: 0;
    color: #667085;
    font-size: 11.5px;
    font-weight: 500;
    line-height: 1.3;
    white-space: nowrap;
}

/* =========================================================
   DESKTOP NAVIGATION
========================================================= */

@media (min-width: 1501px) {
    .site-header .header__panel {
        display: contents;
    }

    .site-header .main-nav {
        grid-column: 2;
        min-width: 0;
        justify-self: center;
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: center;
        gap: clamp(13px, 1.15vw, 21px);
        white-space: nowrap;
    }

    .site-header .main-nav>a,
    .site-header .nav-dropdown__main-button {
        position: relative;
        width: auto;
        height: auto;
        flex: 0 0 auto;
        min-height: var(--header-height);
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 7px;
        margin: 0;
        padding: 0;
        border: 0;
        background: transparent;
        color: var(--header-text);
        cursor: pointer;
        font-family: "Montserrat", sans-serif;
        appearance: none;
        -webkit-appearance: none;
        font-size: var(--header-nav-font-size);
        font-weight: 600;
        line-height: 1;
        letter-spacing: 0;
        text-decoration: none;
        white-space: nowrap;
        transition:
            color 0.22s ease,
            min-height 0.3s ease;
    }

    .site-header .nav-dropdown {
        position: relative;
    }

    .site-header .nav-dropdown__label {
        display: flex;
        align-items: center;
    }

    .site-header .nav-dropdown__main-button>span {
        display: block;
        white-space: nowrap;
    }

    .site-header .nav-dropdown__main-button>i {
        flex: 0 0 auto;
        margin: 0;
        color: #6b7280;
        font-size: 9px;
        line-height: 1;
        transition: transform 0.22s ease;
    }

    .site-header .main-nav>a::after,
    .site-header .nav-dropdown__main-button::after {
        position: absolute;
        right: 0;
        bottom: 25px;
        left: 0;
        height: 2px;
        content: "";
        transform: scaleX(0);
        transform-origin: center;
        border-radius: 999px;
        background: var(--header-accent);
        transition: transform 0.22s ease;
    }

    .site-header .main-nav>a:hover,
    .site-header .main-nav>a:focus-visible,
    .site-header .nav-dropdown:hover .nav-dropdown__main-button,
    .site-header .nav-dropdown:focus-within .nav-dropdown__main-button,
    .site-header .nav-dropdown.is-open .nav-dropdown__main-button {
        color: var(--header-accent);
    }

    /* Menu chính chỉ đổi màu chữ/gạch chân, không tạo nền dạng ô. */
    .site-header .main-nav>a:hover,
    .site-header .main-nav>a:focus-visible,
    .site-header .main-nav>a.is-active,
    .site-header .nav-dropdown:hover .nav-dropdown__main-button,
    .site-header .nav-dropdown:focus-within .nav-dropdown__main-button,
    .site-header .nav-dropdown.is-active .nav-dropdown__main-button,
    .site-header .nav-dropdown.is-open .nav-dropdown__main-button {
        border-radius: 0 !important;
        background: transparent !important;
        box-shadow: none !important;
    }

    .site-header .main-nav>a:hover::after,
    .site-header .main-nav>a:focus-visible::after,
    .site-header .main-nav>a.is-active::after,
    .site-header .nav-dropdown:hover .nav-dropdown__main-button::after,
    .site-header .nav-dropdown:focus-within .nav-dropdown__main-button::after,
    .site-header .nav-dropdown.is-active .nav-dropdown__main-button::after,
    .site-header .nav-dropdown.is-open .nav-dropdown__main-button::after {
        transform: scaleX(1);
    }

    .site-header .nav-dropdown:hover .nav-dropdown__main-button>i,
    .site-header .nav-dropdown:focus-within .nav-dropdown__main-button>i,
    .site-header .nav-dropdown.is-open .nav-dropdown__main-button>i {
        transform: rotate(180deg);
        color: var(--header-accent);
    }

    /* Dropdown của mọi menu dùng chung kích thước và chuyển động. */
    .site-header .nav-submenu {
        position: absolute;
        z-index: 2100;
        top: calc(100% - 7px);
        left: 50%;
        width: 360px;
        display: grid;
        gap: 4px;
        padding: 9px;
        visibility: hidden;
        opacity: 0;
        transform: translate(-50%, 10px);
        pointer-events: none;
        border: 1px solid rgba(17, 24, 39, 0.09);
        border-radius: 10px;
        background: rgba(255, 255, 255, 0.99);
        box-shadow: 0 20px 48px rgba(17, 24, 39, 0.14);
        transition:
            opacity 0.2s ease,
            visibility 0.2s ease,
            transform 0.24s cubic-bezier(0.22, 1, 0.36, 1);
    }

    .site-header .nav-submenu::before {
        position: absolute;
        top: -13px;
        right: 0;
        left: 0;
        height: 13px;
        content: "";
    }

    .site-header .nav-dropdown:hover>.nav-submenu,
    .site-header .nav-dropdown:focus-within>.nav-submenu,
    .site-header .nav-dropdown.is-open>.nav-submenu {
        visibility: visible;
        opacity: 1;
        transform: translate(-50%, 0);
        pointer-events: auto;
    }

    .site-header .nav-submenu>a {
        min-width: 0;
        display: grid;
        grid-template-columns: 39px minmax(0, 1fr);
        align-items: center;
        gap: 11px;
        padding: 11px 12px;
        border-radius: 10px;
        color: #526d80;
        text-decoration: none;
        transition:
            color 0.18s ease,
            background-color 0.18s ease,
            transform 0.18s ease;
    }

    .site-header .nav-submenu>a:hover,
    .site-header .nav-submenu>a:focus-visible,
    .site-header .nav-submenu>a.is-current {
        transform: translateX(2px);
        background: #eef8fc;
    }

    .site-header .nav-submenu__icon {
        width: 39px;
        height: 39px;
        display: grid;
        place-items: center;
        border-radius: 10px;
        background: #e9f5fa;
        color: var(--header-accent);
        font-size: 12px;
        transition:
            color 0.18s ease,
            background-color 0.18s ease;
    }

    .site-header .nav-submenu>a:hover .nav-submenu__icon,
    .site-header .nav-submenu>a:focus-visible .nav-submenu__icon,
    .site-header .nav-submenu>a.is-current .nav-submenu__icon {
        background: var(--header-accent);
        color: #ffffff;
    }

    .site-header .nav-submenu>a>span:last-child {
        min-width: 0;
    }

    .site-header .nav-submenu strong {
        display: block;
        margin-bottom: 3px;
        color: var(--header-navy);
        font-family: "Montserrat", sans-serif;
        font-size: 12.5px;
        font-weight: 700;
        line-height: 1.35;
    }

    .site-header .nav-submenu small {
        display: block;
        margin: 0;
        color: #7c8f9e;
        font-family: "Montserrat", sans-serif;
        font-size: 10.5px;
        font-weight: 400;
        line-height: 1.45;
        white-space: normal;
    }
}

/* =========================================================
   ACTIONS
========================================================= */

.site-header .header__actions {
    grid-column: 3;
    min-width: max-content;
    justify-self: end;
    display: flex;
    align-items: center;
    gap: 10px;
}

.site-header .header__placement {
    min-height: 46px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding-inline: 17px;
    border: 1px solid var(--header-yellow);
    border-radius: 8px;
    background: var(--header-yellow);
    color: #392e00;
    box-shadow: 0 10px 24px rgba(245, 185, 0, 0.18);
    font-family: "Montserrat", sans-serif;
    font-size: 13px;
    font-weight: 800;
    text-decoration: none;
    white-space: nowrap;
}

.site-header .header__placement:hover {
    transform: translateY(-1px);
    background: #e9b932;
    color: #302600;
}

.site-header .account-nav {
    display: flex;
    align-items: center;
    gap: 10px;
}

.site-header .account-nav form {
    margin: 0;
}

.site-header .account-nav .button {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    padding-inline: 14px;
    border-radius: 9px;
    font-family: "Montserrat", sans-serif;
    font-size: 13px !important;
    font-weight: 750;
    line-height: 1;
    text-decoration: none;
    white-space: nowrap;
}

.site-header .account-nav .button--outline {
    border: 1px solid #b7d3e1;
    background: #ffffff;
    color: var(--header-navy);
}

/* =========================================================
   STUCK DESKTOP
   Outer header giữ chỗ; wrapper trượt xuống và fixed trên cùng.
========================================================= */

@media (min-width: 1501px) {
    .site-header__sticky-wrapper.stuck {
        position: fixed;
        z-index: 2000;
        top: 0;
        right: 0;
        left: 0;
        width: 100%;
        background: var(--header-blue);
        border-bottom: 1px solid rgba(255, 255, 255, 0.18);
        box-shadow: 0 10px 30px rgba(18, 61, 107, 0.24);
        animation: headerStuckSlideDown 0.52s cubic-bezier(0.16, 1, 0.3, 1) both;
        will-change: transform;
        backface-visibility: hidden;
    }

    @keyframes headerStuckSlideDown {
        from {
            transform: translate3d(0, calc(-100% - 10px), 0);
        }

        to {
            transform: translate3d(0, 0, 0);
        }
    }

    .site-header .site-header__sticky-wrapper.stuck .site-header__inner {
        min-height: var(--header-stuck-height);
    }

    .site-header .site-header__sticky-wrapper.stuck .main-nav>a,
    .site-header .site-header__sticky-wrapper.stuck .nav-dropdown__main-button {
        min-height: var(--header-stuck-height);
        color: #ffffff !important;
    }

    .site-header .site-header__sticky-wrapper.stuck .main-nav>a:hover,
    .site-header .site-header__sticky-wrapper.stuck .main-nav>a:focus-visible,
    .site-header .site-header__sticky-wrapper.stuck .nav-dropdown:hover .nav-dropdown__main-button,
    .site-header .site-header__sticky-wrapper.stuck .nav-dropdown:focus-within .nav-dropdown__main-button,
    .site-header .site-header__sticky-wrapper.stuck .nav-dropdown.is-open .nav-dropdown__main-button {
        color: var(--header-yellow) !important;
    }

    .site-header .site-header__sticky-wrapper.stuck .main-nav>a.is-active,
    .site-header .site-header__sticky-wrapper.stuck .nav-dropdown.is-active .nav-dropdown__main-button {
        color: #ffffff !important;
    }

    .site-header .site-header__sticky-wrapper.stuck .main-nav>a.is-active:hover,
    .site-header .site-header__sticky-wrapper.stuck .main-nav>a.is-active:focus-visible,
    .site-header .site-header__sticky-wrapper.stuck .nav-dropdown.is-active:hover .nav-dropdown__main-button,
    .site-header .site-header__sticky-wrapper.stuck .nav-dropdown.is-active:focus-within .nav-dropdown__main-button {
        color: var(--header-yellow) !important;
    }

    .site-header .site-header__sticky-wrapper.stuck .main-nav>a::after,
    .site-header .site-header__sticky-wrapper.stuck .nav-dropdown__main-button::after {
        bottom: 17px;
        background: var(--header-yellow);
    }

    .site-header .site-header__sticky-wrapper.stuck .brand__content strong {
        color: #ffffff !important;
    }

    .site-header .site-header__sticky-wrapper.stuck .brand__content small {
        color: rgba(255, 255, 255, 0.84) !important;
    }

    .site-header .site-header__sticky-wrapper.stuck .brand__logo-box {
        width: max-content;
        height: auto;
        flex-basis: auto;
        padding: 3px;
        border: 1px solid rgba(255, 255, 255, 0.82);
        border-radius: 8px;
        background: rgba(255, 255, 255, 0.96);
        box-shadow: 0 4px 12px rgba(9, 48, 83, 0.2);
    }

    .site-header .site-header__sticky-wrapper.stuck .brand__logo {
        width: auto;
        height: auto;
    }

    .site-header .site-header__sticky-wrapper.stuck .header__placement {
        border-color: var(--header-yellow);
        background: var(--header-yellow);
        color: #392e00;
        box-shadow: none;
    }

    .site-header .site-header__sticky-wrapper.stuck .account-nav .button--outline {
        border-color: rgba(255, 255, 255, 0.76);
        background: transparent;
        color: #ffffff;
    }

    .site-header .site-header__sticky-wrapper.stuck .account-nav .header-register {
        border-color: var(--header-yellow);
        background: var(--header-yellow);
        color: #392e00;
        box-shadow: none;
    }

    .site-header .site-header__sticky-wrapper.stuck .nav-dropdown__main-button>i {
        color: rgba(255, 255, 255, 0.84);
    }

    .site-header .site-header__sticky-wrapper.stuck .nav-dropdown:hover .nav-dropdown__main-button>i,
    .site-header .site-header__sticky-wrapper.stuck .nav-dropdown:focus-within .nav-dropdown__main-button>i,
    .site-header .site-header__sticky-wrapper.stuck .nav-dropdown.is-open .nav-dropdown__main-button>i {
        color: var(--header-yellow);
    }
}

/* =========================================================
   MOBILE / TABLET
========================================================= */

.site-header .menu-toggle {
    grid-column: 2;
    justify-self: end;
    width: 46px;
    height: 46px;
    display: none;
    padding: 10px;
    border: 1px solid #dedede;
    border-radius: 6px;
    background: #ffffff;
    cursor: pointer;
}

.site-header .menu-toggle>span:not(.sr-only) {
    width: 100%;
    height: 2px;
    display: block;
    margin: 5px 0;
    border-radius: 999px;
    background: var(--header-text);
}

.site-header .menu-toggle:hover,
.site-header .menu-toggle:focus-visible {
    border-color: var(--header-accent);
    background: #f1f8fc;
}

.site-header .menu-toggle:hover>span:not(.sr-only),
.site-header .menu-toggle:focus-visible>span:not(.sr-only) {
    background: var(--header-accent);
}

@media (max-width: 1500px) {

    .site-header,
    .site-header__sticky-wrapper {
        position: relative;
        top: auto;
        transform: none;
        animation: none;
        background: #ffffff;
    }

    /* Bản mobile/media cũng xuất hiện lại dưới dạng header xanh cố định. */
    .site-header .site-header__sticky-wrapper.stuck {
        position: fixed;
        z-index: 2000;
        top: 0;
        right: 0;
        left: 0;
        width: 100%;
        background: var(--header-blue);
        border-bottom: 1px solid rgba(255, 255, 255, 0.18);
        box-shadow: 0 10px 30px rgba(18, 61, 107, 0.24);
        animation: headerMobileStuckSlideDown 0.48s cubic-bezier(0.16, 1, 0.3, 1) both;
        will-change: transform;
        backface-visibility: hidden;
    }

    @keyframes headerMobileStuckSlideDown {
        from {
            transform: translate3d(0, calc(-100% - 8px), 0);
        }

        to {
            transform: translate3d(0, 0, 0);
        }
    }

    .site-header .site-header__sticky-wrapper.stuck .site-header__inner {
        min-height: var(--header-stuck-height);
    }

    .site-header .site-header__sticky-wrapper.stuck .brand__content strong {
        color: #ffffff !important;
    }

    .site-header .site-header__sticky-wrapper.stuck .brand__content small {
        color: rgba(255, 255, 255, 0.84) !important;
    }

    .site-header .site-header__sticky-wrapper.stuck .brand__logo-box {
        padding: 3px;
        border: 1px solid rgba(255, 255, 255, 0.82);
        border-radius: 8px;
        background: rgba(255, 255, 255, 0.96);
        box-shadow: 0 4px 12px rgba(9, 48, 83, 0.2);
    }

    .site-header .site-header__sticky-wrapper.stuck .menu-toggle {
        border-color: rgba(255, 255, 255, 0.5) !important;
        background: rgba(255, 255, 255, 0.1) !important;
    }

    .site-header .site-header__sticky-wrapper.stuck .menu-toggle>span:not(.sr-only) {
        background: #ffffff !important;
    }

    .site-header .site-header__sticky-wrapper.stuck .menu-toggle:hover,
    .site-header .site-header__sticky-wrapper.stuck .menu-toggle:focus-visible {
        border-color: var(--header-yellow) !important;
        background: rgba(255, 255, 255, 0.16) !important;
    }

    .site-header .site-header__sticky-wrapper.stuck .menu-toggle:hover>span:not(.sr-only),
    .site-header .site-header__sticky-wrapper.stuck .menu-toggle:focus-visible>span:not(.sr-only) {
        background: var(--header-yellow) !important;
    }

    .site-header__inner {
        min-height: 84px;
        grid-template-columns: minmax(0, 1fr) auto;
        column-gap: 16px;
        padding-inline: 18px;
    }

    .site-header .brand {
        justify-self: start;
    }

    .site-header .brand__logo-box {
        width: max-content;
        height: auto;
        flex-basis: auto;
    }

    .site-header .brand__logo {
        width: auto;
        height: auto;
    }

    .site-header .menu-toggle {
        display: block;
    }

    .site-header .header__panel {
        position: fixed;
        z-index: 2200;
        top: 86px;
        right: 18px;
        left: 18px;
        max-height: calc(100dvh - 104px);
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 18px;
        overflow-y: auto;
        overscroll-behavior: contain;
        padding: 20px;
        border: 1px solid var(--header-border);
        border-radius: 10px;
        background: #ffffff;
        box-shadow: 0 24px 58px rgba(17, 24, 39, 0.16);
    }

    .site-header .header__panel.is-open {
        display: flex;
    }

    .site-header .main-nav {
        min-width: 0;
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 5px;
        white-space: normal;
    }

    .site-header .main-nav>a,
    .site-header .nav-dropdown__main-button {
        width: 100%;
        min-height: 48px;
        display: inline-flex;
        align-items: center;
        justify-content: flex-start;
        gap: 9px;
        padding: 0 14px;
        border: 0;
        border-radius: 5px;
        background: #ffffff;
        color: var(--header-text);
        cursor: pointer;
        font-family: "Montserrat", sans-serif;
        appearance: none;
        -webkit-appearance: none;
        font-size: var(--header-nav-font-size);
        font-weight: 600;
        text-align: left;
        text-decoration: none;
    }

    .site-header .nav-dropdown__main-button {
        justify-content: space-between;
    }

    .site-header .main-nav>a:hover,
    .site-header .main-nav>a:focus-visible,
    .site-header .main-nav>a.is-active,
    .site-header .nav-dropdown__main-button:hover,
    .site-header .nav-dropdown__main-button:focus-visible,
    .site-header .nav-dropdown.is-active .nav-dropdown__main-button,
    .site-header .nav-dropdown.is-open .nav-dropdown__main-button {
        background: #eef8fc;
        color: var(--header-accent);
    }

    .site-header .nav-dropdown__main-button>i {
        font-size: 11px;
        transition: transform 0.22s ease;
    }

    .site-header .nav-dropdown.is-open .nav-dropdown__main-button>i {
        transform: rotate(180deg);
        color: var(--header-accent);
    }

    .site-header .nav-submenu {
        position: static;
        width: auto;
        display: none;
        gap: 4px;
        margin-top: 6px;
        padding: 8px;
        visibility: visible;
        opacity: 1;
        transform: none;
        pointer-events: auto;
        border: 1px solid var(--header-border);
        border-radius: 12px;
        background: #ffffff;
        box-shadow: none;
    }

    .site-header .nav-dropdown.is-open>.nav-submenu {
        display: grid;
    }

    .site-header .nav-submenu>a {
        min-width: 0;
        display: grid;
        grid-template-columns: 39px minmax(0, 1fr);
        align-items: center;
        gap: 11px;
        padding: 11px 12px;
        border-radius: 10px;
        color: #526d80;
        text-decoration: none;
    }

    .site-header .nav-submenu>a:hover,
    .site-header .nav-submenu>a.is-current {
        background: #eef8fc;
    }

    .site-header .nav-submenu__icon {
        width: 39px;
        height: 39px;
        display: grid;
        place-items: center;
        border-radius: 10px;
        background: #e9f5fa;
        color: var(--header-accent);
    }

    .site-header .nav-submenu strong {
        display: block;
        margin-bottom: 3px;
        color: var(--header-navy);
        font-family: "Montserrat", sans-serif;
        font-size: 12.5px;
        font-weight: 700;
    }

    .site-header .nav-submenu small {
        display: block;
        color: #667085;
        font-family: "Montserrat", sans-serif;
        font-size: 10.5px;
        line-height: 1.45;
        white-space: normal;
    }

    .site-header .header__actions {
        min-width: 0;
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
        padding-top: 15px;
        border-top: 1px solid var(--header-border);
    }

    .site-header .header__placement,
    .site-header .account-nav .button,
    .site-header .account-nav form,
    .site-header .account-nav form button {
        width: 100%;
    }

    .site-header .account-nav {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px;
    }

    .site-header .account-nav .button {
        min-height: 48px;
        padding-inline: 12px;
        font-size: 13px !important;
    }

    .site-header .site-header__sticky-wrapper.stuck .header__panel {
        top: calc(var(--header-stuck-height) + 2px);
    }

    body.menu-is-open {
        overflow: hidden;
    }
}

@media (max-width: 620px) {
    :root {
        --header-height: 76px;
    }

    .site-header__inner {
        min-height: 76px;
        padding-inline: 14px;
    }

    .site-header .brand {
        gap: 9px;
    }

    .site-header .brand__logo-box {
        width: max-content;
        height: auto;
        flex-basis: auto;
        border-radius: 0;
    }

    .site-header .brand__logo {
        width: auto;
        height: auto;
    }

    .site-header .brand__content small {
        display: none;
    }

    .site-header .header__panel {
        top: 78px;
        right: 10px;
        left: 10px;
        max-height: calc(100dvh - 88px);
        padding: 14px;
    }

    /* Header mobile ban đầu dùng nền trắng; trạng thái stuck được xử lý phía trên. */
    #site-root.home-page .site-header,
    #site-root.home-page .site-header__sticky-wrapper:not(.stuck) {
        background: #ffffff !important;
        border-bottom-color: var(--header-border);
    }

    #site-root.home-page .site-header__sticky-wrapper:not(.stuck) .brand__content strong {
        color: var(--header-navy) !important;
    }

    #site-root.home-page .site-header__sticky-wrapper:not(.stuck) .menu-toggle {
        border-color: #dedede !important;
        background: #ffffff !important;
    }

    #site-root.home-page .site-header__sticky-wrapper:not(.stuck) .menu-toggle>span:not(.sr-only) {
        background: var(--header-text) !important;
    }
}

@media (max-width: 420px) {
    .site-header .brand__content strong {
        font-size: 14px;
    }

    .site-header .account-nav {
        grid-template-columns: 1fr;
    }

    .site-header .account-nav .button {
        justify-content: flex-start;
        padding-inline: 16px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .site-header__sticky-wrapper.stuck {
        animation: none !important;
    }

    .site-header *,
    .site-header *::before,
    .site-header *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}

.site-header .account-nav .header-register {
    border: 1px solid var(--header-blue);
    background: var(--header-blue);
    color: #ffffff;
    box-shadow: 0 9px 22px rgba(30, 115, 190, .18);
}

.site-header .account-nav .header-login:hover,
.site-header .account-nav .header-login:focus-visible {
    border-color: var(--header-blue);
    background: var(--header-soft);
    color: var(--header-blue);
}

.site-header .account-nav .header-register:hover,
.site-header .account-nav .header-register:focus-visible {
    border-color: var(--header-blue-dark);
    background: var(--header-blue-dark);
    color: #ffffff;
    transform: translateY(-1px);
}

/* Khóa học có nhiều mục cấp 2 hơn Giới thiệu/Khám phá. */
@media (min-width: 1501px) {
    .site-header .nav-submenu--courses {
        width: 400px;
    }
}