/* Shared page chrome: header, footer, containers. */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--space-4);
}

.site-header {
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg);
    position: sticky;
    top: 0;
    z-index: 50;
}

.site-header__bar {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding-block: var(--space-4);
}

.site-header__brand {
    font-weight: 700;
    font-size: var(--font-size-lg);
    text-decoration: none;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* Mobile-first: the nav is a dropdown panel, closed by default, toggled by the hamburger button. */
.nav-toggle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    width: 2.75rem;
    height: 2.75rem;
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: none;
    color: var(--color-text);
    cursor: pointer;
}

.nav-toggle__bar {
    display: block;
    width: 1.25rem;
    height: 2px;
    background-color: currentColor;
    border-radius: 1px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.site-nav {
    display: none;
    position: absolute;
    inset-inline: 0;
    top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-4);
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4);
    box-shadow: var(--shadow-md);
}

.site-nav[data-open="true"] {
    display: flex;
}

.site-nav__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    list-style: none;
    margin: 0;
    padding: 0;
}

.site-nav__list a {
    display: block;
    padding: var(--space-3);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
}

.site-nav__list a:hover {
    background-color: var(--color-bg-subtle);
}

.site-nav__list a[aria-current="page"] {
    color: var(--color-accent);
}

.site-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
}

/* From here on, screens are wide enough for the full horizontal nav bar. */
@media (min-width: 48rem) {
    .nav-toggle {
        display: none;
    }

    .site-nav {
        display: flex;
        position: static;
        flex-direction: row;
        align-items: center;
        gap: var(--space-6);
        background: none;
        border-bottom: none;
        box-shadow: none;
        padding: 0;
    }

    .site-nav__list {
        flex-direction: row;
        gap: var(--space-6);
    }

    .site-nav__list a {
        padding: var(--space-2) 0;
    }

    .site-controls {
        padding-top: 0;
        border-top: none;
    }
}

.theme-toggle,
.lang-switcher__current {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    padding: var(--space-2) var(--space-3);
    cursor: pointer;
    font-size: var(--font-size-sm);
}

.lang-switcher {
    position: relative;
}

.lang-switcher__menu {
    position: absolute;
    right: 0;
    top: calc(100% + var(--space-2));
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    padding: var(--space-2);
    display: none;
    min-width: 8rem;
}

.lang-switcher[data-open="true"] .lang-switcher__menu {
    display: block;
}

.lang-switcher__menu a {
    display: block;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--color-text);
}

.lang-switcher__menu a:hover {
    background-color: var(--color-bg-subtle);
}

main {
    min-height: 60vh;
    container-type: inline-size;
}

.site-footer {
    container-type: inline-size;
}

.site-footer {
    border-top: 1px solid var(--color-border);
    background-color: var(--color-bg-subtle);
    margin-top: var(--space-24);
    padding-block: var(--space-12);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.site-footer__grid {
    display: grid;
    gap: var(--space-6);
    grid-template-columns: 1fr;
}

@container (min-width: 40rem) {
    .site-footer__grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.site-footer a {
    color: var(--color-text-muted);
}