:root {
    --nav-height: 64px;
    --nav-logo-height: clamp(74px, 7.2vw, 92px);
    --nav-logo-overhang: calc((var(--nav-logo-height) - var(--nav-height)) / 2);
    --nav-max: 1500px;
    --nav-pad-x: 20px;
    --nav-radius: 999px;
    /* iOS safe area (modern default) */
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --vv-bottom-offset: 0px;
    --bottom-nav-height: 92px;
}

/* Legacy iOS safe-area() syntax */
@supports (padding: constant(safe-area-inset-bottom)) {
    :root {
        --safe-bottom: constant(safe-area-inset-bottom);
    }
}

html, body {
    max-width: 100%;
    overflow-x: clip;
}

/* ── Premium header shell ── */
.site-nav-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    /* Keep header above page-level fixed widgets/styles */
    z-index: 99999 !important;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(20px) saturate(1.2);
    -webkit-backdrop-filter: blur(20px) saturate(1.2);
    border-bottom: 1px solid rgba(236, 236, 236, 0.9);
    box-shadow: 0 1px 0 rgba(17, 17, 17, 0.04), 0 8px 32px rgba(17, 17, 17, 0.04);
    transition: box-shadow 0.3s ease, background 0.3s ease;
    overflow: visible;
}

.site-nav-header:hover {
    box-shadow: var(--nav-shadow);
}

.site-nav-header__inner {
    height: var(--nav-height);
    max-width: var(--nav-max);
    margin: 0 auto;
    padding: 0 var(--nav-pad-x);
    display: grid;
    grid-template-columns: minmax(148px, auto) 1fr auto;
    align-items: center;
    gap: 22px;
    overflow: visible;
    position: relative;
}

/* ── Logo (oversized, overflows navbar vertically) ── */
.site-nav-logo-zone {
    position: relative;
    z-index: 1002;
    display: flex;
    align-items: center;
    align-self: center;
    height: var(--nav-height);
    min-width: 148px;
    padding-right: 10px;
    overflow: visible;
    pointer-events: none;
}

.site-nav-logo {
    display: inline-flex;
    align-items: center;
    justify-content: flex-start;
    text-decoration: none;
    color: var(--nav-text);
    user-select: none;
    line-height: 0;
    pointer-events: auto;
    transform: translateY(calc(var(--nav-logo-overhang) * 0.55));
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), filter 0.35s ease;
}

.site-nav-logo:hover {
    transform: translateY(calc(var(--nav-logo-overhang) * 0.55 - 2px)) scale(1.02);
    filter: drop-shadow(0 16px 28px rgba(15, 23, 42, 0.14));
}

.site-nav-logo__img,
.site-nav-logo__video,
.site-nav-logo__fallback {
    height: var(--nav-logo-height);
    width: auto;
    display: block;
    object-fit: contain;
    object-position: left center;
}

.site-nav-logo__img,
.site-nav-logo__video {
    filter: drop-shadow(0 12px 24px rgba(15, 23, 42, 0.16));
}

.site-nav-logo__video {
    pointer-events: none;
    max-width: 100%;
}

.site-nav-logo__fallback {
    display: none;
}

.site-nav-logo__media-wrap {
    display: inline-block;
    line-height: 0;
}

.site-nav-logo__mark {
    width: 44px;
    height: 44px;
    border-radius: 14px;
    background: linear-gradient(135deg, #0B1220 0%, #111827 55%, #1F2937 100%);
    box-shadow: 0 12px 22px rgba(15, 23, 42, 0.14);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
}

.site-nav-logo__mark i {
    font-size: 18px;
    filter: drop-shadow(0 6px 10px rgba(0,0,0,0.18));
}

.site-nav-logo__text {
    font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
    font-weight: 800;
    font-size: 20px;
    letter-spacing: 0.02em;
    color: #0B1220;
    text-transform: lowercase;
}

/* ── Center menu ── */
.site-nav-main {
    justify-self: center;
    display: flex;
    align-items: center;
    gap: clamp(18px, 2.4vw, 36px);
    min-width: 0;
    flex-wrap: wrap;
    justify-content: center;
}

.site-nav-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: #0b1220;
    font-weight: 800;
    padding: 6px 10px;
    border-radius: var(--nav-radius);
    transition: color 0.3s ease, transform 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
    white-space: nowrap;
}

.site-nav-link i {
    color: rgba(15, 23, 42, 0.55);
    font-size: 14px;
    transition: color 0.3s ease, transform 0.3s ease;
}

.site-nav-link:hover {
    color: var(--gold-dark);
    transform: translateY(-1px);
}

.site-nav-link:hover i {
    color: var(--gold);
    transform: translateY(-1px);
}

.site-nav-link.is-active,
.site-nav-link.active {
    background: var(--gold-gradient);
    color: var(--dark);
    padding: 8px 14px;
    box-shadow: var(--gold-shadow-sm);
}

.site-nav-link.is-active i,
.site-nav-link.active i {
    color: var(--dark);
}

/* ── Right actions ── */
.site-nav-actions {
    justify-self: end;
    display: inline-flex;
    align-items: center;
    gap: 12px;
}

.site-nav-mobile-auth {
    display: none;
    align-items: center;
    gap: 6px;
}

.site-nav-mobile-auth__btn {
    height: 32px;
    padding: 0 12px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 800;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
}

.site-nav-mobile-auth__btn--ghost {
    border: 1px solid var(--nav-border);
    color: var(--nav-text);
    background: #fff;
}

.site-nav-mobile-auth__btn--register {
    background: var(--gold-gradient);
    color: var(--dark);
    border: 1px solid transparent;
}

.site-nav-auth {
    height: 40px;
    padding: 0 30px;
    border-radius: var(--nav-radius);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-weight: 700;
    transition: transform 0.3s ease, box-shadow 0.3s ease, filter 0.3s ease, border-color 0.3s ease;
    white-space: nowrap;
}

.site-nav-auth--ghost {
    background: #ffffff;
    border: 1px solid var(--nav-border);
    color: var(--nav-text);
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.04);
}

.site-nav-auth--ghost:hover {
    transform: translateY(-2px);
    box-shadow: var(--nav-shadow-soft);
    border-color: var(--gold-border);
}

.site-nav-auth--register {
    background: var(--gold-gradient);
    color: var(--dark);
    box-shadow: var(--gold-shadow-sm);
}

.site-nav-auth--register:hover {
    transform: translateY(-2px);
    filter: brightness(1.02);
    box-shadow: var(--gold-shadow);
}

.site-nav-auth--logout {
    height: 40px;
    padding: 0 18px;
    gap: 8px;
    background: #ffffff;
    border: 1px solid #fecaca;
    color: #b91c1c;
    font-size: 0.88rem;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.04);
}

.site-nav-auth--logout:hover {
    transform: translateY(-2px);
    background: #fef2f2;
    border-color: #f87171;
    box-shadow: var(--nav-shadow-soft);
}

.site-nav-auth--logout span {
    white-space: nowrap;
}

.site-nav-user-menu {
    display: inline-flex;
    position: relative;
    z-index: 1305;
}

.site-nav-user-menu__trigger {
    height: 34px;
    border-radius: 999px;
    border: 1px solid var(--nav-border);
    background: rgba(255,255,255,0.95);
    padding: 0 10px 0 6px;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    cursor: pointer;
    color: #111827;
    font-weight: 700;
    font-size: 12px;
    list-style: none;
}

.site-nav-user-menu__trigger::-webkit-details-marker {
    display: none;
}

.site-nav-user-menu__avatar {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--gold-gradient);
    color: var(--dark);
    font-size: 11px;
    font-weight: 900;
}

.site-nav-user-menu__dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 188px;
    border-radius: 12px;
    border: 1px solid #e5e7eb;
    background: rgba(255,255,255,0.98);
    box-shadow: 0 16px 28px rgba(15, 23, 42, 0.1);
    padding: 6px;
    display: none;
    z-index: 1300;
}

.site-nav-user-menu__dropdown a {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: #111827;
    font-weight: 600;
    font-size: 13px;
    border-radius: 9px;
    padding: 9px 10px;
}

.site-nav-user-menu__dropdown a:hover {
    background: var(--gold-soft);
    color: var(--gold-dark);
}

.site-nav-user-menu[open] .site-nav-user-menu__dropdown {
    display: block;
}

@media (max-width: 1100px) {
    .site-nav-auth--logout span { display: none; }
    .site-nav-auth--logout { padding: 0 14px; }
}

/* ── Language capsule with animated slider ── */
.site-nav-lang {
    position: relative;
    height: 40px;
    padding: 4px;
    border-radius: var(--nav-radius);
    border: 1px solid var(--nav-border);
    background: rgba(255,255,255,0.9);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    overflow: hidden;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.04);
}

.site-nav-lang::before {
    content: '';
    position: absolute;
    top: 4px;
    bottom: 4px;
    left: 4px;
    width: calc(50% - 4px);
    border-radius: var(--nav-radius);
    background: var(--gold-gradient);
    transform: translateX(0);
    transition: transform 0.3s ease;
    box-shadow: var(--gold-shadow-sm);
}

.site-nav-lang.has-en::before {
    transform: translateX(100%);
}

.site-nav-lang a {
    position: relative;
    z-index: 1;
    width: 52px;
    height: 32px;
    border-radius: var(--nav-radius);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-weight: 800;
    font-size: 12px;
    letter-spacing: 0.08em;
    color: var(--nav-muted);
    transition: color 0.3s ease, transform 0.3s ease;
}

.site-nav-lang a:hover { transform: translateY(-1px); }

.site-nav-lang a.is-active { color: var(--dark); font-weight: 800; }

.site-nav-lang-dropdown {
    position: relative;
    z-index: 1305;
}

.site-nav-lang-dropdown__trigger {
    height: 34px;
    border-radius: 10px;
    border: 1px solid var(--nav-border);
    background: #fff;
    color: #111827;
    font-weight: 800;
    font-size: 12px;
    padding: 0 10px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    list-style: none;
}

.site-nav-lang-dropdown__trigger::-webkit-details-marker {
    display: none;
}

.site-nav-lang-dropdown__menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 120px;
    border-radius: 10px;
    border: 1px solid #e5e7eb;
    background: #fff;
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.09);
    padding: 6px;
    display: none;
    z-index: 1300;
}

.site-nav-lang-dropdown__menu a {
    display: block;
    text-decoration: none;
    color: #111827;
    font-weight: 700;
    font-size: 12px;
    border-radius: 8px;
    padding: 8px 10px;
}

.site-nav-lang-dropdown__menu a.is-active,
.site-nav-lang-dropdown__menu a:hover {
    background: var(--gold-soft);
    color: var(--gold-dark);
}

.site-nav-lang-dropdown[open] .site-nav-lang-dropdown__menu {
    display: block;
}

/* ── Hamburger (mobile) ── */
.site-nav-hamburger {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: 14px;
    border: 1px solid var(--nav-border);
    background: rgba(255,255,255,0.9);
    cursor: pointer;
    padding: 10px;
    box-shadow: 0 10px 18px rgba(15,23,42,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.site-nav-hamburger:hover {
    transform: translateY(-2px);
    box-shadow: var(--nav-shadow-soft);
    border-color: var(--gold-border);
}

.site-nav-hamburger span {
    display: block;
    height: 2px;
    background: #111827;
    border-radius: 2px;
    transition: transform 0.25s, opacity 0.25s;
}

.site-nav-hamburger span + span { margin-top: 6px; }

.site-nav-hamburger.is-open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.site-nav-hamburger.is-open span:nth-child(2) { opacity: 0; }
.site-nav-hamburger.is-open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ── Drawer ── */
.site-nav-drawer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.55);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 5100;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
}

.site-nav-drawer-overlay.is-open { opacity: 1; visibility: visible; }

.site-nav-drawer {
    position: fixed;
    top: 0;
    left: 0;
    width: min(360px, 92vw);
    height: 100vh;
    height: 100dvh;
    z-index: 5200;
    transform: translateX(-105%);
    transition: transform 0.3s ease;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid rgba(229,231,235,0.8);
    box-shadow: 14px 0 40px rgba(15,23,42,0.14);
    overflow: auto;
}

.site-nav-drawer.is-open { transform: translateX(0); }

.site-nav-drawer__head {
    padding: 18px 18px 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(229,231,235,0.7);
}

.site-nav-drawer__brand {
    font-family: 'Inter', system-ui, sans-serif;
    font-weight: 900;
    font-size: 18px;
    color: #0B1220;
    text-decoration: none;
}

.site-nav-drawer__close {
    width: 44px;
    height: 44px;
    border-radius: 14px;
    border: 1px solid rgba(229,231,235,0.9);
    background: rgba(255,255,255,0.95);
    cursor: pointer;
    font-size: 20px;
    line-height: 1;
    color: #111827;
    box-shadow: 0 10px 18px rgba(15,23,42,0.06);
}

.site-nav-drawer__group {
    padding: 14px 10px;
}

.site-nav-drawer__label {
    padding: 8px 12px;
    color: #6B7280;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.site-nav-drawer__link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    margin: 4px 6px;
    border-radius: 14px;
    text-decoration: none;
    color: #111827;
    font-weight: 700;
    transition: background 0.25s ease, transform 0.25s ease, color 0.25s ease;
}

.site-nav-drawer__link i { color: rgba(15, 23, 42, 0.55); }

.site-nav-drawer__link:hover {
    background: var(--gold-soft);
    color: var(--dark);
    transform: translateY(-1px);
}

.site-nav-drawer__link.is-active {
    background: var(--gold-gradient);
    color: var(--dark);
    box-shadow: var(--gold-shadow-sm);
}

.site-nav-drawer__link.is-active i { color: var(--dark); }

.site-nav-drawer__link--logout {
    margin-top: 10px;
    color: #b91c1c !important;
    border: 1px solid rgba(248, 113, 113, 0.35);
    background: rgba(254, 242, 242, 0.9);
}

.site-nav-drawer__link--logout i { color: #b91c1c !important; }

.site-nav-drawer__link--logout:hover {
    background: #fee2e2 !important;
    border-color: rgba(248, 113, 113, 0.55);
}

.site-nav-drawer__group--auth {
    display: grid;
    gap: 10px;
    padding: 10px 16px 18px;
}

.site-nav-drawer__auth {
    height: 48px;
    border-radius: var(--nav-radius);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-weight: 800;
}

.site-nav-drawer__auth--ghost {
    background: #ffffff;
    border: 1px solid rgba(229,231,235,0.9);
    color: #111827;
}

.site-nav-drawer__auth--primary {
    background: var(--gold-gradient);
    color: var(--dark);
    box-shadow: var(--gold-shadow-sm);
}

/* ── Body offset ──
   Header is sticky (in-flow), so body padding would create a top gap. */
body.has-site-nav {
    padding-top: var(--nav-height);
    padding-bottom: 0;
}

/* ── Responsive ── */
@media (max-width: 980px) {
    :root {
        --nav-logo-height: clamp(70px, 14vw, 88px);
    }

    .site-nav-header__inner {
        padding: 0 18px;
        grid-template-columns: auto 1fr auto;
    }

    .site-nav-logo-zone {
        min-width: 120px;
        justify-self: start;
    }

    .site-nav-main { display: none; }
    /* Mobile: bỏ hamburger (drawer), dùng menu dưới */
    .site-nav-hamburger { display: none !important; }
    .site-nav-drawer-overlay { display: none !important; }
    .site-nav-drawer { display: none !important; }
    .site-nav-auth { display: none; }
    .site-nav-mobile-auth { display: inline-flex; }
    .site-nav-user-menu { display: inline-flex; }

    .site-bottom-nav { display: flex !important; }
    /* iOS Safari BFCache / page swaps sometimes lose body classes temporarily.
       Apply spacing globally on mobile so content never sits under fixed navs. */
    body {
        padding-top: var(--nav-height);
        padding-bottom: calc(var(--bottom-nav-height) + var(--safe-bottom) + var(--vv-bottom-offset));
    }
    body.has-site-nav {
        padding-top: var(--nav-height);
        padding-bottom: calc(var(--bottom-nav-height) + var(--safe-bottom) + var(--vv-bottom-offset));
    }
}

.site-bottom-nav {
    display: none;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    bottom: calc(var(--safe-bottom) + var(--vv-bottom-offset));
    z-index: 5050;
    height: var(--bottom-nav-height);
    box-sizing: border-box;
    width: 100%;
    max-width: 100vw;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid rgba(236, 236, 236, 0.9);
    box-shadow: 0 -6px 26px rgba(15, 23, 42, 0.08);
    align-items: center;
    justify-content: space-around;
    padding: 10px 8px;
    padding-bottom: calc(10px + var(--safe-bottom));
}

.site-bottom-nav__item {
    width: 20%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    text-decoration: none;
    color: rgba(17, 24, 39, 0.72);
    font-weight: 800;
    font-size: 11px;
    border-radius: 14px;
    padding: 8px 6px;
    transition: transform 0.2s ease, color 0.2s ease, background 0.2s ease;
    white-space: nowrap;
}

.site-bottom-nav__item i {
    font-size: 18px;
    color: rgba(17, 24, 39, 0.62);
}

.site-bottom-nav__icon-img {
    width: 20px;
    height: 20px;
    object-fit: contain;
}

@media (hover: hover) and (pointer: fine) {
    .site-bottom-nav__item:hover {
        background: var(--gold-soft);
        color: var(--gold-dark);
        transform: translateY(-2px);
    }
}

.site-bottom-nav__item.is-active {
    background: var(--gold-soft);
    color: var(--gold-dark);
}

.site-bottom-nav__item.is-active i {
    color: var(--gold-dark);
}

.site-bottom-nav__item.is-active .site-bottom-nav__icon-img {
    filter: saturate(1.15);
}

@media (max-width: 560px) {
    :root {
        --nav-logo-height: clamp(66px, 20vw, 82px);
    }

    .site-nav-actions {
        position: absolute;
        right: 8px;
        top: 14px;
        z-index: 1005;
        gap: 6px;
    }
    .site-nav-mobile-auth__btn {
        height: 30px;
        padding: 0 10px;
        font-size: 11px;
    }
    .site-nav-user-menu__name { display: none; }
    .site-nav-user-menu__trigger {
        padding-right: 8px;
        gap: 6px;
    }
    .site-nav-user-menu__dropdown {
        min-width: 170px;
        right: -2px;
    }
    .site-nav-lang-dropdown__trigger {
        height: 30px;
        font-size: 11px;
        padding: 0 8px;
    }
    .site-nav-logo__text { font-size: 18px; }
    .site-nav-header__inner { gap: 10px; }
    .site-nav-logo-zone { min-width: 104px; padding-right: 4px; }
}