/* ==========================================================================
   Navigation Dropdown - Sector Categories
   GOV.UK styled dropdown for discovery categories navigation
   ========================================================================== */

/* Dropdown container */
.nav-dropdown {
    position: relative;
    display: inline-block;
}

/* Trigger button - styled by .site-header nav button.nav-dropdown__trigger in styles.css */
.nav-dropdown__trigger {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-stack);
    font-weight: var(--font-weight-regular);
    cursor: pointer;
    border-radius: 0;
}

.nav-dropdown__trigger:focus {
    outline: var(--focus-width) solid var(--color-focus);
    outline-offset: 0;
}

/* Chevron icon */
.nav-dropdown__chevron {
    transition: transform var(--transition-slow);
    flex-shrink: 0;
}

.nav-dropdown__trigger[aria-expanded="true"] .nav-dropdown__chevron {
    transform: rotate(180deg);
}

/* Dropdown panel */
.nav-dropdown__menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 440px;
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: 0 0 6px 6px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18), 0 0 0 1px rgba(0, 0, 0, 0.04);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: opacity 120ms ease, transform 120ms ease, visibility 120ms ease;
}

/* Show menu */
.nav-dropdown__trigger[aria-expanded="true"] + .nav-dropdown__menu,
.nav-dropdown:focus-within .nav-dropdown__menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Sections */
.nav-dropdown__section {
    padding: 16px 20px;
}

.nav-dropdown__section + .nav-dropdown__section {
    border-top: 1px solid var(--color-border-light);
}

/* Section heading */
.nav-dropdown__heading {
    display: block;
    font-size: 11px;
    font-weight: 700;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.6px;
    margin-bottom: 10px;
}

/* Item lists — always single column for readability */
.nav-dropdown__list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.nav-dropdown__list li {
    margin: 0;
    padding: 0;
    list-style: none;
}

/* "All sectors" uses a 2-column grid */
.nav-dropdown__list--compact {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

/* Menu item links */
.site-header .nav-dropdown__menu a[href],
.nav-dropdown__menu a[href].nav-dropdown__item,
a[href].nav-dropdown__item {
    display: block;
    padding: 7px 10px;
    color: var(--color-text-primary);
    font-size: 15px;
    text-decoration: none;
    border-radius: 4px;
    border-bottom: none;
    transition: background-color 80ms ease;
    background: transparent;
}

.site-header .nav-dropdown__menu a[href]:hover,
a[href].nav-dropdown__item:hover {
    background: var(--color-bg-alt);
    color: var(--color-gov-blue);
    text-decoration: none;
}

.site-header .nav-dropdown__menu a[href]:focus,
a[href].nav-dropdown__item:focus {
    outline: 3px solid var(--color-focus);
    outline-offset: 0;
    background: var(--color-focus);
    color: var(--color-text-primary);
    text-decoration: none;
}

.site-header .nav-dropdown__menu a[href]:visited,
a[href].nav-dropdown__item:visited {
    color: var(--color-text-primary);
}

/* Footer */
.nav-dropdown__footer {
    padding: 12px 20px;
    background: var(--color-bg-light);
    border-top: 1px solid var(--color-border-light);
    border-radius: 0 0 6px 6px;
}

.site-header .nav-dropdown__view-all[href],
a[href].nav-dropdown__view-all {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--color-gov-blue);
    font-size: 15px;
    font-weight: 700;
    text-decoration: none;
    background: transparent;
    padding: 0;
    border-bottom: none;
}

.site-header .nav-dropdown__view-all[href]:hover,
a[href].nav-dropdown__view-all:hover {
    color: var(--color-gov-blue-dark);
    text-decoration: underline;
}

.site-header .nav-dropdown__view-all[href]:focus,
a[href].nav-dropdown__view-all:focus {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
    background: var(--color-focus);
    color: var(--color-text-primary);
    text-decoration: none;
}

.nav-dropdown__view-all svg {
    flex-shrink: 0;
    stroke: currentColor;
}

/* Mobile */
@media (max-width: 768px) {
    .nav-dropdown__menu {
        position: fixed;
        left: 12px;
        right: 12px;
        min-width: 0;
        width: auto;
        border-radius: 6px;
    }

    .nav-dropdown__list--compact {
        grid-template-columns: 1fr;
    }
}

/* Keyboard accessibility */
.nav-dropdown__trigger:focus + .nav-dropdown__menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}