/* ElevenCode layout shell: sticky header with a collapsible nav (mobile-first), the main
   content container, and the footer. Places the reusable parts; all colour, size and radius
   values come from the design tokens in tokens.css / theme.css. */

body {
	display: flex;
	flex-direction: column;
}

.site-main {
	flex: 1;
}

/* Shared inner width for the shell. Pages can reuse it or define their own sections. */
.container {
	inline-size: 100%;
	max-inline-size: var(--content);
	margin-inline: auto;
	padding: var(--space-10) var(--space-4);
}

/* ---- Brand ---- */

.site-brand {
	display: inline-flex;
	align-items: center;
	color: var(--text);
	text-decoration: none;
	white-space: nowrap;
}

.site-brand:hover {
	text-decoration: none;
}

.site-brand__wordmark {
	display: block;
	inline-size: auto;
	block-size: 22px;
}

.site-brand__wordmark--dark {
	display: none;
}

[data-theme="dark"] .site-brand__wordmark--light {
	display: none;
}

[data-theme="dark"] .site-brand__wordmark--dark {
	display: block;
}

/* The white wordmark also wins when the system asks for dark and no theme is pinned. */
@media (prefers-color-scheme: dark) {
	:root:not([data-theme="light"]) .site-brand__wordmark--light {
		display: none;
	}

	:root:not([data-theme="light"]) .site-brand__wordmark--dark {
		display: block;
	}
}

/* ---- Header ---- */

.site-header {
	position: sticky;
	inset-block-start: 0;
	z-index: 30;
	background: var(--bg);
	border-block-end: 1px solid var(--border);
}

.site-header__bar {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: var(--space-3);
	max-inline-size: var(--content);
	margin-inline: auto;
	padding: var(--space-3) var(--space-4);
}

.site-brand {
	margin-inline-end: auto;
}

.site-header__toggle {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	inline-size: var(--control);
	block-size: var(--control);
	padding: 0;
	border: 1px solid var(--border);
	border-radius: var(--radius-sm);
	background: var(--surface);
	color: var(--text);
	cursor: pointer;
}

.site-header__toggle:hover {
	background: var(--surface-hover);
}

.site-header__icon-close {
	display: none;
}

.site-header.is-open .site-header__icon-open {
	display: none;
}

.site-header.is-open .site-header__icon-close {
	display: block;
}

.site-header__menu {
	display: none;
	flex-direction: column;
	gap: var(--space-3);
	flex-basis: 100%;
	padding: var(--space-3) var(--space-4) var(--space-4);
	border-block-start: 1px solid var(--border);
}

.site-header.is-open .site-header__menu,
.no-js .site-header__menu {
	display: flex;
}

/* ---- Nav ---- */

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

.site-nav__link {
	display: flex;
	align-items: center;
	min-block-size: var(--control);
	padding: var(--space-2) var(--space-3);
	border-radius: var(--radius-sm);
	color: var(--text-secondary);
	font-weight: var(--weight-medium);
	text-decoration: none;
	white-space: nowrap;
}

.site-nav__link:hover {
	background: var(--surface-hover);
	color: var(--text);
	text-decoration: none;
}

.site-nav__link[aria-current="page"] {
	color: var(--text);
}

/* ---- Header actions ---- */

.site-header__actions {
	display: flex;
	flex-direction: column;
	gap: var(--space-2);
}

.site-header__actions .btn {
	inline-size: 100%;
}

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

.site-footer {
	border-block-start: 1px solid var(--border);
	background: var(--bg-subtle);
}

.site-footer__grid {
	display: grid;
	grid-template-columns: 1fr;
	gap: var(--space-8);
	max-inline-size: var(--content);
	margin-inline: auto;
	padding: var(--space-10) var(--space-4) var(--space-8);
}

.site-footer__brand {
	display: flex;
	flex-direction: column;
	gap: var(--space-3);
}

.site-footer__tagline {
	max-inline-size: 40ch;
	color: var(--text-secondary);
}

.site-footer__col {
	display: flex;
	flex-direction: column;
	gap: var(--space-3);
}

.site-footer__heading {
	font-size: var(--text-sm);
	font-weight: var(--weight-semibold);
	color: var(--text);
}

.site-footer__list {
	display: flex;
	flex-direction: column;
	gap: var(--space-2);
	margin: 0;
	padding: 0;
	list-style: none;
}

.site-footer__link {
	display: inline-flex;
	align-items: center;
	min-block-size: 32px;
	color: var(--text-secondary);
	text-decoration: none;
	white-space: nowrap;
}

.site-footer__link:hover {
	color: var(--text);
	text-decoration: underline;
}

.site-footer__bottom {
	border-block-start: 1px solid var(--border);
}

.site-footer__copyright {
	max-inline-size: var(--content);
	margin-inline: auto;
	padding: var(--space-4);
	color: var(--text-secondary);
	font-size: var(--text-sm);
}

/* ---- 404: one centred card with the two ways back ---- */

/* The 404 card takes the free height under the header, so it lands in the middle of the page. */
.site-main:has(> .not-found) {
	display: flex;
	flex-direction: column;
	min-block-size: 60svh;
}

.not-found {
	display: grid;
	justify-items: center;
	gap: var(--space-3);
	max-inline-size: 40rem;
	margin-block: auto;
	padding-block: var(--space-10);
	text-align: center;
}

.not-found__title {
	margin: 0;
}

.not-found__actions {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: var(--space-3);
	margin-block-start: var(--space-4);
}

/* ---- Desktop (901px+): logo | centred nav | actions on one line ---- */

@media (min-width: 901px) {
	.site-header__toggle {
		display: none;
	}

	.site-brand {
		margin-inline-end: 0;
	}

	.site-header__menu {
		display: flex;
		flex-direction: row;
		align-items: center;
		gap: var(--space-6);
		flex: 1;
		padding: 0;
		border-block-start: 0;
	}

	.site-nav {
		display: flex;
		flex: 1;
		justify-content: center;
	}

	.site-nav__list {
		flex-direction: row;
	}

	.site-header__actions {
		flex-direction: row;
		align-items: center;
		margin-inline-start: auto;
	}

	.site-header__actions .btn {
		inline-size: auto;
	}
}

/* ---- Desktop footer (761px+): brand column beside the link columns ---- */

@media (min-width: 761px) {
	.site-footer__grid {
		grid-template-columns: 2fr 1fr 1fr;
	}
}