/* ------ basis css */
.page-row {
  display: flex;
  gap: var(--spacing-md);
}
.page-row > div {
	flex: 1;
}
.page-row ul {
	margin-left: var(--spacing-md);
}

/* Responsive page layout */
@media (max-width: 768px) {
	.page-row {
		flex-direction: column;
		gap: var(--spacing-sm, 1rem);
	}
	
	.page-row > div {
		flex: none;
		width: 100%;
	}
}

a:hover {
	color: var(--color-accent, #0284c7);
}

.button {
	display: inline-block;
	padding: 15px 30px;
	background-color: #1e3a8a;
	color: white;
	text-decoration: none;
	border-radius: 5px;
	font-weight: bold;
	font-size: 1.1rem;
	transition: background-color 0.3s ease;
}

.button:hover {
	background-color: #0284c7;
}

.callout {
	border-left: 4px solid;
	padding: 1rem;
	border-radius: 0 0.375rem 0.375rem 0;
	margin: 1rem 0;
}

.callout[data-intent="info"] {
	border-left-color: #3b82f6;
	background-color: #eff6ff;
	color: #1e3a8a;
}

.callout[data-intent="warning"] {
	border-left-color: #f59e0b;
	background-color: #fffbeb;
	color: #92400e;
}

.callout[data-intent="error"] {
	border-left-color: #ef4444;
	background-color: #fef2f2;
	color: #991b1b;
}

.callout p {
	margin-bottom: 0.5rem;
}

.callout p:last-child {
	margin-bottom: 0;
}

.callout a {
	color: inherit;
	font-weight: 600;
}

.callout a:hover {
	opacity: 0.8;
}

/* ------ element accordion css */
/* Accordion Styles */
.accordion-item {
	margin-bottom: 0;
}

.accordion-header {
	width: 100%;
	text-align: left;
	padding: 15px 20px;
	background: #f5f5f5;
	border: 1px solid #ddd;
	border-bottom: none;
	cursor: pointer;
	font-size: 1.1rem;
	font-weight: 600;
	display: flex;
	justify-content: space-between;
	align-items: center;
	transition: background-color 0.2s ease;
}

.accordion-header:hover {
	background: #e8e8e8;
}

.accordion-header:focus {
	outline: 2px solid #007cba;
	outline-offset: -2px;
}

.accordion-icon {
	transition: transform 0.3s ease;
	font-size: 1.2rem;
	font-weight: bold;
}

.accordion-content {
	display: none;
	padding: 20px;
	border: 1px solid #ddd;
	border-top: none;
	background: white;
	animation: slideDown 0.3s ease;
}

.accordion-content.show {
	display: block;
}

@keyframes slideDown {
	from {
		opacity: 0;
		max-height: 0;
		padding-top: 0;
		padding-bottom: 0;
	}
	to {
		opacity: 1;
		max-height: 1000px;
		padding-top: 20px;
		padding-bottom: 20px;
	}
}

/* Last accordion item styling */
.accordion-item:last-child .accordion-header {
	border-bottom: 1px solid #ddd;
}

.accordion-item:last-child .accordion-content {
	border-bottom: 1px solid #ddd;
}

/* ------ element hero css */
.hero {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

/* ------ element osm-box css */
.osm-box {
  height: 250px;
  width: 100%;
}

/* ------ layout css */
/* Palette values come from the website's stored palette map.  A key absent
   from that map renders as a Go placeholder marker, and custom properties
   accept any token sequence, so a var() fallback at the use site would not
   catch it -- `or` with the manifest default is what makes this safe.  It
   also covers sites saved before the font keys were added. */
:root {
	--background-main: #fffefa;
	--background-body: #eef2f6;
	--sidebar-background: #474439;
	--accent-background: #f9eba4;
	--text-color: #645c54;
	--sidebar-text-color: #fafafa;
	--accent-text-color: #63615a;
	--link-color: #1d4ed8;
	--link-hover-color: #c7c229;
	--border-color: #e9e9e9;
	--font-header: Times New Roman, serif;
	--font-body: Arial;

	--sidebar-width: 288px;
	--mobile-header-height: 64px;
	--content-max: 900px;
	--spacing-xs: 0.5rem;
	--spacing-sm: 1rem;
	--spacing-md: 1.5rem;
	--spacing-lg: 2rem;
	--spacing-xl: 3rem;
	--radius: 10px;
	--radius-sm: 6px;
	--shadow: 0 1px 2px rgba(16, 32, 48, 0.06), 0 1px 3px rgba(16, 32, 48, 0.04);
	--shadow-hover: 0 6px 18px rgba(16, 32, 48, 0.10), 0 2px 5px rgba(16, 32, 48, 0.05);
	--transition: 0.18s ease;
}

* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

body {
	background: var(--background-body);
	color: var(--text-color);
	font-family: var(--font-body), system-ui, sans-serif;
	font-size: 17px;
	line-height: 1.7;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

img {
	max-width: 100%;
	height: auto;
}

.site-wrapper {
	min-height: 100vh;
}

/* Sidebar
   ------------------------------------------------------------------ */

.sidebar {
	position: fixed;
	top: 0;
	left: 0;
	width: var(--sidebar-width);
	height: 100vh;
	display: flex;
	flex-direction: column;
	background: var(--sidebar-background);
	color: var(--sidebar-text-color);
	z-index: 1000;
}

.sidebar-header {
	padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
	border-bottom: 1px solid color-mix(in srgb, var(--sidebar-text-color) 16%, transparent);
	font-family: var(--font-header), system-ui, sans-serif;
	font-size: 1.3rem;
	font-weight: 700;
	line-height: 1.25;
	letter-spacing: -0.015em;
}

.sidebar-header a {
	color: inherit;
	text-decoration: none;
}

.sidebar-header p,
.sidebar-header h1,
.sidebar-header h2,
.sidebar-header h3 {
	margin: 0;
	font-size: inherit;
	font-weight: inherit;
	color: inherit;
}

.sidebar-nav {
	flex: 1;
	overflow-y: auto;
	padding: var(--spacing-sm) 0.6rem var(--spacing-lg);
}

.menu-list,
.submenu-list {
	list-style: none;
	margin: 0;
	padding: 0;
}

.menu-link,
.submenu-link {
	display: block;
	padding: 0.55rem 0.75rem;
	border-radius: var(--radius-sm);
	color: var(--sidebar-text-color);
	text-decoration: none;
	font-size: 0.97rem;
	font-weight: 500;
	transition: background-color var(--transition), color var(--transition);
}

.menu-link:hover,
.submenu-link:hover {
	background: color-mix(in srgb, var(--sidebar-text-color) 12%, transparent);
	color: var(--sidebar-text-color);
}

.menu-item.active > .menu-link,
.submenu-item.active > .submenu-link {
	background: var(--accent-background);
	color: var(--accent-text-color);
	font-weight: 600;
}

.menu-item.active-child > .menu-link {
	color: var(--accent-text-color);
	font-weight: 600;
}

/* Nested levels are indented with a guide rule rather than more boxes. */
.submenu-list {
	margin: 0.15rem 0 0.4rem 0.75rem;
	padding-left: 0.6rem;
	border-left: 1px solid color-mix(in srgb, var(--sidebar-text-color) 20%, transparent);
}

.submenu-link {
	font-size: 0.92rem;
	font-weight: 400;
	opacity: 0.92;
}

/* Content
   ------------------------------------------------------------------ */

.main-content {
	margin-left: var(--sidebar-width);
	min-height: 100vh;
	display: flex;
	flex-direction: column;
	padding: var(--spacing-lg);
}

.page-content {
	flex: 1;
	width: 100%;
	max-width: var(--content-max);
	margin: 0 auto;
	background: var(--background-main);
	border: 1px solid var(--border-color);
	border-radius: var(--radius);
	box-shadow: var(--shadow);
	padding: var(--spacing-xl);
}

.page-content .page-row + .page-row {
	margin-top: var(--spacing-lg);
}

h1, h2, h3, h4, h5, h6 {
	font-family: var(--font-header), system-ui, sans-serif;
	color: var(--text-color);
	font-weight: 700;
	line-height: 1.25;
	letter-spacing: -0.018em;
	margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.3rem; margin-bottom: var(--spacing-md); }
h2 { font-size: 1.6rem; margin-top: var(--spacing-lg); }
h3 { font-size: 1.2rem; }
h4 { font-size: 1.05rem; }

.page-row > div > :first-child {
	margin-top: 0;
}

p {
	margin-bottom: var(--spacing-sm);
	max-width: 72ch;
}

ul, ol {
	margin: 0 0 var(--spacing-sm) var(--spacing-md);
}

li {
	margin-bottom: 0.3rem;
}

a {
	color: var(--link-color);
	text-decoration-color: color-mix(in srgb, var(--link-color) 35%, transparent);
	text-underline-offset: 0.16em;
	transition: color var(--transition), text-decoration-color var(--transition);
}

a:hover {
	color: var(--link-hover-color);
	text-decoration-color: currentColor;
}

hr {
	border: none;
	border-top: 1px solid var(--border-color);
	margin: var(--spacing-lg) 0;
}

blockquote {
	margin: var(--spacing-md) 0;
	padding: var(--spacing-xs) var(--spacing-md);
	border-left: 3px solid var(--accent-background);
	color: color-mix(in srgb, var(--text-color) 70%, white);
}

/* Elements
   ------------------------------------------------------------------ */

.hero {
	border-radius: var(--radius);
	overflow: hidden;
}

.hero h1 {
	font-family: var(--font-header), system-ui, sans-serif;
	text-shadow: 0 2px 14px rgba(0, 0, 0, 0.4);
}

.box {
	height: 100%;
	background: var(--background-main);
	border: 1px solid var(--border-color);
	border-radius: var(--radius);
	box-shadow: var(--shadow);
	overflow: hidden;
	padding-bottom: var(--spacing-sm);
	transition: box-shadow var(--transition), transform var(--transition);
}

.box:hover {
	box-shadow: var(--shadow-hover);
	transform: translateY(-2px);
}

.box img {
	display: block;
	width: 100%;
	aspect-ratio: 16 / 10;
	object-fit: cover;
	margin-bottom: var(--spacing-sm);
}

.box h3,
.box h4,
.box > div {
	padding: 0 var(--spacing-sm);
}

.box h3 {
	font-size: 1.1rem;
	margin-top: 0;
	margin-bottom: 0.15rem;
}

.box h4 {
	font-size: 0.85rem;
	font-weight: 600;
	color: color-mix(in srgb, var(--text-color) 62%, white);
	margin-bottom: var(--spacing-xs);
}

.box p:last-child {
	margin-bottom: 0;
}

.button {
	display: inline-block;
	padding: 0.7rem 1.4rem;
	background-color: var(--accent-background);
	color: var(--accent-text-color);
	font-family: var(--font-header), system-ui, sans-serif;
	font-size: 1rem;
	font-weight: 600;
	text-decoration: none;
	border: none;
	border-radius: var(--radius-sm);
	box-shadow: var(--shadow);
	cursor: pointer;
	transition: background-color var(--transition), box-shadow var(--transition);
}

.button:hover {
	background-color: color-mix(in srgb, var(--accent-background) 86%, black);
	color: var(--accent-text-color);
	box-shadow: var(--shadow-hover);
}

.accordion-item + .accordion-item {
	margin-top: 0.4rem;
}

.accordion-header {
	background: var(--background-body);
	border: 1px solid var(--border-color);
	border-radius: var(--radius-sm);
	font-family: var(--font-header), system-ui, sans-serif;
	font-size: 1rem;
	font-weight: 600;
	color: var(--text-color);
	padding: 0.8rem var(--spacing-sm);
	transition: background-color var(--transition);
}

.accordion-header:hover {
	background: color-mix(in srgb, var(--background-body) 88%, black);
}

.accordion-header:focus-visible {
	outline: 2px solid var(--accent-background);
	outline-offset: 2px;
}

.accordion-content {
	border: 1px solid var(--border-color);
	border-top: none;
	border-radius: 0 0 var(--radius-sm) var(--radius-sm);
	background: var(--background-main);
	padding: var(--spacing-sm);
}

.accordion-item:last-child .accordion-header,
.accordion-item:last-child .accordion-content {
	border-bottom: 1px solid var(--border-color);
}

.osm-box {
	border: 1px solid var(--border-color);
	border-radius: var(--radius);
}

table {
	width: 100%;
	border-collapse: collapse;
	margin: var(--spacing-md) 0;
	font-size: 0.97rem;
	border: 1px solid var(--border-color);
}

th, td {
	padding: 0.65rem var(--spacing-sm);
	text-align: left;
	border-bottom: 1px solid var(--border-color);
}

th {
	background: var(--background-body);
	font-weight: 600;
}

tbody tr:last-child td {
	border-bottom: none;
}

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

.site-footer {
	width: 100%;
	max-width: var(--content-max);
	margin: var(--spacing-md) auto 0;
	padding: var(--spacing-sm) var(--spacing-xs);
	text-align: center;
	font-size: 0.88rem;
	color: color-mix(in srgb, var(--text-color) 62%, white);
}

.site-footer p {
	margin: 0 auto 0.3rem;
	max-width: none;
}

.site-footer a {
	color: inherit;
}

/* Mobile
   ------------------------------------------------------------------ */

.mobile-header {
	display: none;
	position: sticky;
	top: 0;
	z-index: 900;
	align-items: center;
	gap: var(--spacing-sm);
	height: var(--mobile-header-height);
	padding: 0 var(--spacing-sm);
	background: var(--sidebar-background);
	color: var(--sidebar-text-color);
}

.mobile-header-content {
	font-family: var(--font-header), system-ui, sans-serif;
	font-size: 1.1rem;
	font-weight: 700;
	line-height: 1.2;
	overflow: hidden;
}

.mobile-header-content a {
	color: inherit;
	text-decoration: none;
}

.mobile-header-content p {
	margin: 0;
}

.mobile-menu-toggle {
	display: flex;
	flex-direction: column;
	justify-content: space-around;
	width: 1.6rem;
	height: 1.4rem;
	flex: 0 0 auto;
	background: transparent;
	border: none;
	cursor: pointer;
	padding: 0;
}

.hamburger-line {
	width: 100%;
	height: 2px;
	border-radius: 2px;
	background: var(--sidebar-text-color);
}

.mobile-menu-overlay {
	display: none;
	position: fixed;
	inset: 0;
	background: rgba(6, 16, 26, 0.5);
	z-index: 999;
}

.mobile-menu-overlay.overlay-active {
	display: block;
}

body.menu-open {
	overflow: hidden;
}

@media (max-width: 900px) {
	:root {
		--spacing-lg: 1.25rem;
		--spacing-xl: 1.5rem;
	}

	body {
		font-size: 16px;
	}

	.mobile-header {
		display: flex;
	}

	.sidebar {
		transform: translateX(-100%);
		transition: transform 0.25s ease;
		box-shadow: var(--shadow-hover);
	}

	.sidebar.sidebar-open {
		transform: translateX(0);
	}

	.main-content {
		margin-left: 0;
		padding: var(--spacing-sm);
	}

	.page-content {
		padding: var(--spacing-md);
	}

	h1 { font-size: 1.8rem; }
	h2 { font-size: 1.35rem; }
}