/*
 * Layout — page frame.
 *
 * Skip link, main column, footer. Structural rules only.
 * Navigation is in components/navigation.css.
 * Footer styles are at the bottom of this file.
 */

/* The page is a column: header, main that grows, footer pinned to bottom. */
body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ---- Skip link ------------------------------------------------------------------------------ */

.skip-link {
    position: absolute;
    inset-inline-start: var(--space-3);
    top: var(--space-3);
    z-index: var(--layer-overlay);
    transform: translateY(-200%);
    padding: var(--space-2) var(--space-4);
    background-color: var(--colour-surface-raised);
    color: var(--colour-primary);
    border: var(--border-width) solid var(--colour-border-strong);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-raised);
    transition: transform var(--duration-fast) var(--easing);
    text-decoration: none;
    font-weight: var(--weight-medium);
}

.skip-link:focus {
    transform: translateY(0);
}

/* ---- Main ----------------------------------------------------------------------------------- */

.site-main {
    flex: 1;
    width: 100%;
    max-width: var(--page-width);
    margin-inline: auto;
    padding: var(--space-6) var(--gutter) var(--space-8);
}

.site-main:focus {
    outline: none;
}

.page {
    display: flow-root;
}

/* ---- Error pages ---------------------------------------------------------------------------- */

.page--error {
    max-width: var(--measure);
}

.error__message {
    margin-top: var(--space-4);
    font-size: var(--text-lg);
}

.error__reference {
    margin-top: var(--space-5);
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: var(--colour-ink-quiet);
}

.error__actions {
    margin-top: var(--space-6);
}

.error__debug {
    margin-top: var(--space-7);
    padding: var(--space-4);
    background-color: var(--colour-surface-sunken);
    border-inline-start: var(--focus-width) solid var(--colour-error);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: var(--text-sm);
}

.error__debug-heading {
    margin-top: 0;
    font-size: var(--text-base);
}

.error__debug-line {
    margin-top: var(--space-2);
    max-width: none;
    overflow-wrap: anywhere;
}

.error__debug-trace {
    margin-top: var(--space-3);
    padding-inline-start: var(--space-5);
}

.error__debug-frame {
    overflow-wrap: anywhere;
}

/* ---- Footer --------------------------------------------------------------------------------- */

.site-footer {
    background: var(--colour-surface-sunken);
    border-top: 1px solid var(--colour-border);
    margin-top: auto;
}

.site-footer__inner {
    max-width: var(--page-width);
    margin: 0 auto;
    padding: var(--space-6) var(--gutter);
}

.site-footer__top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-6);
    margin-bottom: var(--space-6);
}

.site-footer__brand {
    flex-shrink: 0;
}

.site-footer__name {
    font-size: var(--text-lg);
    font-weight: var(--weight-bold);
    color: var(--colour-ink);
}

.site-footer__tagline {
    font-size: var(--text-sm);
    color: var(--colour-ink-quiet);
    margin: var(--space-1) 0 0;
}

.site-footer__nav {
    flex-shrink: 0;
}

.site-footer__links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-4);
    padding: 0;
    margin: 0;
    list-style: none;
}

.site-footer__link {
    font-size: var(--text-sm);
    color: var(--colour-ink-quiet);
    text-decoration: none;
    transition: color var(--duration-fast) var(--easing);
}

.site-footer__link:hover {
    color: var(--colour-primary);
}

.site-footer__bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--colour-border);
}

.site-footer__copyright {
    font-size: var(--text-sm);
    color: var(--colour-ink-quiet);
    margin: 0;
}

.site-footer__eu {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--colour-ink-quiet);
    margin: 0;
}

.site-footer__eu svg {
    color: var(--colour-primary);
    flex-shrink: 0;
}

/* ---- Footer responsive ---------------------------------------------------------------------- */

@media (max-width: 640px) {
    .site-footer__top {
        flex-direction: column;
        gap: var(--space-4);
    }

    .site-footer__bottom {
        flex-direction: column;
        text-align: center;
    }
}