/* Modern public navigation with a restrained, session-randomized accent line. */
.site-header {
    --header-glow-a: #61d8ff;
    --header-glow-b: #ef6cff;
    --header-glow-c: #ffd65c;
    isolation: isolate;
    height: 74px;
    gap: clamp(14px, 1.7vw, 26px);
    border-bottom: 0;
    background: color-mix(in srgb, var(--bg), transparent 5%);
    box-shadow: 0 10px 32px color-mix(in srgb, #000, transparent 88%);
}

.site-header[data-glow-palette="1"] { --header-glow-a: #43e6bd; --header-glow-b: #75a7ff; --header-glow-c: #f48bd6; }
.site-header[data-glow-palette="2"] { --header-glow-a: #ff8a66; --header-glow-b: #ffd45e; --header-glow-c: #64d9ff; }
.site-header[data-glow-palette="3"] { --header-glow-a: #a68cff; --header-glow-b: #55e2d0; --header-glow-c: #ff86aa; }
.site-header[data-glow-palette="4"] { --header-glow-a: #5ed7ff; --header-glow-b: #8ee06e; --header-glow-c: #ffc266; }
.site-header[data-glow-palette="5"] { --header-glow-a: #ff78a8; --header-glow-b: #8c9cff; --header-glow-c: #5de0ba; }

.site-header::before,
.site-header::after {
    content: "";
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    pointer-events: none;
}

.site-header::before {
    z-index: -1;
    height: 1px;
    background: color-mix(in srgb, var(--border), transparent 20%);
}

.site-header::after {
    z-index: 1;
    height: 2px;
    background: linear-gradient(90deg, transparent 2%, var(--header-glow-a) 23%, var(--header-glow-b) 51%, var(--header-glow-c) 77%, transparent 98%);
    background-size: 180% 100%;
    box-shadow: 0 0 6px color-mix(in srgb, var(--header-glow-b), transparent 62%);
    opacity: .62;
    animation: header-glow-drift 16s ease-in-out infinite alternate;
    transform: translateZ(0);
    will-change: background-position;
}

html[data-theme="light"] .site-header {
    background: color-mix(in srgb, #f7f8f4, transparent 4%);
    box-shadow: 0 8px 24px rgba(25, 35, 24, .07);
}

html[data-theme="light"] .site-header::after {
    box-shadow: 0 0 5px color-mix(in srgb, var(--header-glow-b), transparent 72%);
    opacity: .68;
}

.site-header .brand {
    min-width: max-content;
    white-space: nowrap;
}

.main-nav {
    gap: clamp(10px, 1.35vw, 22px);
}

.main-nav > a,
.nav-dropdown > summary {
    position: relative;
    min-height: 46px;
    padding-inline: 2px;
}

.main-nav > a::after,
.nav-dropdown > summary::after {
    content: "";
    position: absolute;
    right: 50%;
    bottom: 6px;
    left: 50%;
    height: 1px;
    background: currentColor;
    opacity: .55;
    transition: right .2s ease, left .2s ease;
}

.main-nav > a:hover::after,
.main-nav > a:focus-visible::after,
.nav-dropdown > summary:hover::after,
.nav-dropdown > summary:focus-visible::after,
.nav-dropdown[open] > summary::after {
    right: 0;
    left: 0;
}

.menu-toggle {
    align-content: center;
    justify-items: center;
    gap: 5px;
    padding: 0;
    background: color-mix(in srgb, var(--surface), transparent 5%);
}

.menu-toggle > span {
    display: block;
    width: 18px;
    height: 1.5px;
    border-radius: 3px;
    background: currentColor;
    transition: transform .2s ease, opacity .16s ease;
}

.menu-toggle[aria-expanded="true"] > span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] > span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] > span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

@keyframes header-glow-drift {
    0% { background-position: 0% 50%; }
    46% { background-position: 62% 50%; }
    100% { background-position: 100% 50%; }
}

@media (max-width: 1100px) {
    .site-header {
        grid-template-columns: minmax(0, 1fr) 48px auto;
        height: 72px;
        gap: 8px;
        padding-inline: max(12px, env(safe-area-inset-left));
    }

    .site-header > .menu-toggle {
        grid-column: 2;
        grid-row: 1;
        display: grid;
        width: 48px;
        height: 48px;
        border: 1px solid color-mix(in srgb, var(--border), transparent 4%);
        border-radius: 12px;
    }

    .site-header .header-actions {
        display: flex;
        grid-column: 3;
        min-width: 0;
        align-items: center;
        gap: 6px;
    }

    .site-header .main-nav {
        position: fixed;
        inset: 80px 12px auto;
        max-height: calc(100dvh - 92px);
        padding: 10px;
        overflow-y: auto;
        gap: 3px;
        border: 1px solid color-mix(in srgb, var(--border), transparent 4%);
        border-radius: 14px;
        background: color-mix(in srgb, var(--surface), transparent 2%);
        box-shadow: 0 24px 60px rgba(0, 0, 0, .28);
        overscroll-behavior: contain;
    }

    .site-header .main-nav > a,
    .site-header .nav-dropdown > summary {
        width: 100%;
        min-height: 50px;
        padding: 12px 14px;
        border-radius: 9px;
    }

    .site-header .main-nav > a::after,
    .site-header .nav-dropdown > summary::after {
        display: none;
    }

    .site-header .main-nav > a:hover,
    .site-header .main-nav > a:focus-visible,
    .site-header .nav-dropdown > summary:hover,
    .site-header .nav-dropdown > summary:focus-visible {
        background: color-mix(in srgb, var(--surface-2), transparent 12%);
    }

    .site-header .nav-dropdown-panel {
        gap: 2px;
        margin: 0 0 6px;
        border: 0;
        border-radius: 10px;
        background: color-mix(in srgb, var(--surface-2), transparent 20%);
    }

    .site-header .nav-dropdown-panel a {
        min-height: 52px;
        padding: 11px 12px;
    }

    .site-header .header-search {
        order: 20;
        display: grid !important;
        grid-template-columns: minmax(0, 1fr) auto;
        width: 100% !important;
        margin-top: 8px;
        padding-top: 10px;
        border-top: 1px solid color-mix(in srgb, var(--border), transparent 15%);
    }

    .site-header .header-search input,
    .site-header .header-search button {
        min-height: 48px;
    }
}

@media (max-width: 600px) {
    .site-header {
        grid-template-columns: minmax(96px, 1fr) 48px auto;
        height: 68px;
        gap: 5px;
        padding-inline: 9px;
    }

    .site-header .brand {
        min-width: 0;
        overflow: hidden;
        font-size: clamp(.96rem, 4.5vw, 1.08rem);
        text-overflow: clip;
    }

    .site-header > .menu-toggle {
        width: 48px;
        height: 48px;
        border-radius: 11px;
    }

    .site-header .header-actions {
        gap: 4px;
    }

    .site-header .currency-switcher select {
        width: 54px;
        min-width: 54px;
        height: 44px;
        min-height: 44px;
        padding: 0 5px;
        border-radius: 10px;
        font-size: .72rem;
    }

    .site-header .header-actions .theme-toggle {
        flex: 0 0 48px;
        width: 48px;
        min-width: 48px;
        height: 48px;
        border-radius: 10px;
    }

    .site-header .cart-link {
        min-width: 48px;
        min-height: 48px;
        justify-content: center;
        padding: 0 9px;
        border-radius: 10px;
        font-size: .76rem;
    }

    .site-header .main-nav {
        inset: 76px 8px auto;
        max-height: calc(100dvh - 84px);
    }
}

@media (max-width: 370px) {
    .site-header {
        grid-template-columns: minmax(80px, 1fr) 48px auto;
        gap: 2px;
        padding-inline: 4px;
    }

    .site-header > .menu-toggle,
    .site-header .header-actions .theme-toggle {
        width: 48px;
        min-width: 48px;
        height: 48px;
    }

    .site-header .currency-switcher select {
        width: 48px;
        min-width: 48px;
    }

    .site-header .cart-link {
        min-width: 48px;
        padding-inline: 6px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .site-header::after { animation: none; }
    .menu-toggle > span { transition: none; }
}