/* Explain: Styles for the mobile navigation drawer. */
/* ============================================================
   Mobile navigation — a slick slide-in drawer that replaces the
   plain dropdown list. Hidden on desktop, where the inline nav
   and the toggle button are already swapped over.
   ============================================================ */

.mobile-nav {
    position: fixed;
    inset: 0;
    z-index: 70;
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, visibility 0s linear 0.42s;
}

.mobile-nav.is-open {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    transition: opacity 0.3s ease, visibility 0s;
}

.mobile-nav-scrim {
    position: absolute;
    inset: 0;
    background: rgba(2, 7, 93, 0.55);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    opacity: 0;
    transition: opacity 0.35s ease;
}

.mobile-nav.is-open .mobile-nav-scrim {
    opacity: 1;
}

.mobile-nav-panel {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    width: min(21rem, 90vw);
    background: var(--surface-color);
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: transform 0.42s cubic-bezier(0.22, 1, 0.36, 1);
}

.mobile-nav.is-open .mobile-nav-panel {
    transform: translateX(0);
}

.mobile-nav-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.1rem 1.25rem;
    border-top: 4px solid var(--accent-color);
    border-bottom: 1px solid var(--border-color);
}

.mobile-nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 0;
    text-decoration: none;
}

.mobile-nav-close {
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--surface-alt);
    color: var(--text-color);
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, transform 0.25s ease;
}

.mobile-nav-close:hover {
    background: var(--primary-soft);
    color: var(--primary-color);
    transform: rotate(90deg);
}

.mobile-nav-links {
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;
    gap: 0.25rem;
    min-height: 0;
    padding: 1rem 1rem 0.5rem;
    overflow-y: auto;
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    min-height: 52px;
    padding: 0.65rem 0.9rem;
    border-radius: var(--radius-sm);
    color: var(--text-color);
    font-size: 0.98rem;
    font-weight: 600;
    text-decoration: none;
    opacity: 0;
    transform: translateX(20px);
    transition: background 0.2s ease, color 0.2s ease, opacity 0.45s ease, transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.mobile-nav.is-open .mobile-nav-link {
    opacity: 1;
    transform: translateX(0);
}

.mobile-nav-link i {
    width: 1.15rem;
    flex-shrink: 0;
    text-align: center;
    color: var(--primary-color);
    font-size: 1rem;
}

.mobile-nav-link:hover,
.mobile-nav-link:focus-visible {
    background: var(--primary-soft);
    color: var(--primary-color);
}

.mobile-nav-link.is-active {
    background: var(--primary-soft);
    color: var(--primary-color);
    font-weight: 700;
    box-shadow: inset 3px 0 0 var(--accent-color);
}

.mobile-nav.is-open .mobile-nav-link:nth-child(1) { transition-delay: 0.08s; }
.mobile-nav.is-open .mobile-nav-link:nth-child(2) { transition-delay: 0.13s; }
.mobile-nav.is-open .mobile-nav-link:nth-child(3) { transition-delay: 0.18s; }
.mobile-nav.is-open .mobile-nav-link:nth-child(4) { transition-delay: 0.23s; }
.mobile-nav.is-open .mobile-nav-link:nth-child(5) { transition-delay: 0.28s; }
.mobile-nav.is-open .mobile-nav-link:nth-child(6) { transition-delay: 0.33s; }

.mobile-nav-foot {
    margin-top: auto;
    padding: 1.25rem;
    border-top: 1px solid var(--border-color);
    background: var(--surface-alt);
}

html.nav-open {
    overflow: hidden;
}

@media (min-width: 1024px) {
    .mobile-nav {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .mobile-nav,
    .mobile-nav-scrim,
    .mobile-nav-panel,
    .mobile-nav-link {
        transition: none;
    }
}