/*******************************************************************************
CSS VARIABLES
*******************************************************************************/

:root {
	--highlight-weak: rgba(128, 128, 128, 0.2);
	--highlight-strong: rgba(128, 128, 128, 0.4);
	--radius-sm: 0.2rem;
}

/*******************************************************************************
BASE STYLES
*******************************************************************************/

html {
	font-size: 10.5pt;
	height: 100%;
}

/* Sticky footer layout */
body {
	margin: 0 auto;
	min-height: 100%;
	display: flex;
	flex-direction: column;
}

/* Main content fills remaining space */
body > article {
	flex: 1 0 auto;
	padding: 4.5rem 0 1.5rem;
}

/* Footer stays at bottom */
body > footer {
	margin-top: auto;
	flex-shrink: 0;
}

img,
svg {
	max-width: 100%;
	max-height: 80vh;
	height: auto;
	width: auto;
}

/* Give lazy-loaded images a non-zero offscreen placeholder for layout. */
img[loading="lazy"] {
	content-visibility: auto;
	contain-intrinsic-size: auto 400px;
}

/*
   CONTENT ALIGNMENT & CENTERING
   Shared logic for images, SVGs
*/

/* 1. Content centered in the main text column (55% width) */
section > img,
section > svg {
	max-width: 55%;
	position: relative;
	left: 27.5%;
	transform: translateX(-50%);
}

section > img,
section > svg {
	display: block;
}

/* 2. Content centered in figures (100% of figure width) */
section > figure:not(.fullwidth) > img,
section > figure:not(.fullwidth) > svg {
	max-width: 100%;
	margin-left: auto;
	margin-right: auto;
}

section > figure:not(.fullwidth) > img,
section > figure:not(.fullwidth) > svg {
	display: block;
}

/* Fullwidth content */
.fullwidth {
	max-width: 90%;
	clear: both;
}

.fullwidth img,
.fullwidth svg {
	max-width: 100%;
}

/*******************************************************************************
TYPOGRAPHY
*******************************************************************************/

/* Paragraph alignment and spacing */
p {
	text-align: justify;
	text-justify: inter-ideograph;
	line-height: 2.2rem;
}

/* List spacing */
ul,
ol,
dl {
	line-height: 2.2rem;
}

/* Heading styles */
h1,
h2,
h3,
h4,
h5 {
	font-style: normal;
	font-weight: bold;
	color: #111;
}

h2 {
	font-size: 2.3rem;
	line-height: 1.2;
	margin-top: 2rem;
	margin-bottom: 1rem;
}

h3 {
	font-size: 2rem;
	line-height: 1.2;
	margin-top: 1.5rem;
	margin-bottom: 0.8rem;
}

h4 {
	font-size: 1.75rem;
	line-height: 1.2;
	margin-top: 1.2rem;
	margin-bottom: 0.5rem;
}

h5 {
	font-size: 1.5rem;
	line-height: 1.2;
	margin-top: 1rem;
	margin-bottom: 0.5rem;
}

/* Article metadata shown directly below the title */
.article-byline {
	width: 55%;
	margin: -0.4rem 0 1.6rem;
	color: var(--theme-text, #111);
	font-size: 1.2rem;
	line-height: 1.5;
	opacity: 0.7;
}

.article-byline p {
	width: 100%;
	margin: 0;
	text-align: left;
	line-height: inherit;
}

.article-extra-info {
	margin-top: 0.2rem;
	font-size: 0.85em;
}

/* English/numeric text in headings */
.heading-en {
	font-style: italic;
}

/*******************************************************************************
CODE BLOCKS AND INLINE CODE
*******************************************************************************/

/* Code block container */
pre {
	position: relative;
	background-color: #f7f7f7;
	border: 1px solid #e0e0e0;
	border-radius: 5px;
	padding: 1em;
	padding-bottom: 0.5em;
	overflow-x: auto;
	margin-bottom: 1.5em;
	width: 55%;
	margin-left: 0;
	margin-right: 0;
	float: none;
	clear: none;
	box-sizing: border-box;
	left: 0;
}

/* Code within pre */
pre > code {
	width: 95%;
	font-size: 1.2rem;
	line-height: 1.5;
	margin-left: 0%;
	background-color: transparent;
	padding: 0;
	padding-bottom: 0.7em;
	border: none;
}

/* Code blocks with line numbers */
pre.has-line-numbers {
	display: flex;
	align-items: flex-start;
}

.line-numbers-rows {
	display: flex;
	flex-direction: column;
	padding-right: 0.4em;
	margin-right: 0.4em;
	border-right: 1px solid #ddd;
	color: #aaa;
	user-select: none;
	text-align: right;
	min-width: 1.2em;
	font-size: 1.2rem;
	line-height: 1.5;
	font-family: monospace;
}

/* Inline code */
code {
	font-size: 1.2rem;
	background-color: #f7f7f7;
	padding: 0.1em 0.3em;
	border-radius: 3px;
	border: 1px solid #e7e7e7;
}

/* Code blocks in lists */
li pre,
ul pre,
ol pre,
dl pre {
	width: 100%;
}

/* Code blocks in figures */
figure pre {
	width: 100%;
}

/* Copy button */
.copy-button {
	position: absolute;
	top: 0.5em;
	right: 0.5em;
	padding: 0.3em 0.6em;
	font-size: 0.8rem;
	color: #666;
	background-color: #fff;
	border: 1px solid #ccc;
	border-radius: 4px;
	cursor: pointer;
	opacity: 0;
	transition:
		opacity 0.2s,
		background-color 0.2s;
}

pre:hover .copy-button {
	opacity: 1;
}

.copy-button:hover {
	background-color: #f0f0f0;
	color: #333;
}

.copy-button.copied {
	background-color: #e6fffa;
	color: #008000;
	border-color: #008000;
}

/*******************************************************************************
QUOTE BLOCKS
*******************************************************************************/

/* Quote blocks with left border */
div[style*="border-inline-start"] {
	width: 55% !important;
	font-size: 1.4rem;
	line-height: 2.2rem;
	clear: none;
	margin: 1.5em 0;
	padding-right: 0;
	box-sizing: border-box;
}

/* Nested quote blocks should take full width of parent */
div[style*="border-inline-start"] div[style*="border-inline-start"] {
	width: 100% !important;
	margin: 0.5em 0;
}

div[style*="border-inline-start"] p {
	font-size: 1.4rem;
	margin: 0.5em 0;
	width: 100%;
}

div[style*="border-inline-start"] .footnote-ref,
div[style*="border-inline-start"] .marginnote,
div[style*="border-inline-start"] .footnote-ref a {
	color: #111;
}

/*******************************************************************************
TABLES
*******************************************************************************/

table {
	width: auto;
	margin: 1.5em auto;
	border-collapse: collapse;
	font-size: 1.4rem;
	line-height: 1.2;
}

/* Naked tables behave like the main text column */
section > table {
	width: auto;
	position: relative;
	left: 27.5%;
	transform: translateX(-50%);
	margin-left: 0;
	margin-right: 0;
}

table th,
table td {
	padding: 0.5em 0.7em;
	border: 1px solid #ccc;
	text-align: left;
	vertical-align: top;
}

table th,
table thead td {
	background-color: #f5f5f5;
	font-weight: bold;
	text-align: center;
}

table tbody tr:nth-child(even) {
	background-color: #fafafa;
}

table tbody tr:hover {
	background-color: #f0f0f0;
}

@media (max-width: 760px) {
	table {
		font-size: 1.2rem;
	}

	/* Reset naked table positioning on mobile */
	section > table {
		left: 0;
		transform: none;
		margin: 1.5em auto;
	}

	figure {
		margin: 1.5em auto;
	}

	table th,
	table td {
		padding: 0.4em 0.6em;
	}
}

/*******************************************************************************
MATH NOTATION
*******************************************************************************/

/* Block math equations - display as block, centered */
figure[role="math"] {
	display: block;
	width: 55%;
	text-align: center;
	margin: 1em 0;
	padding: 0.5em 0;
	font-size: 1.4em;
	line-height: 1.2;
	overflow-x: auto;
	overflow-y: hidden;
}

/* Math content wrapper - prevent shrinking */
figure[role="math"] > * {
	display: inline-block;
	min-width: max-content;
	text-align: center;
}

figure > figure[role="math"] {
	display: block;
	width: 100%;
	text-align: center;
	margin: 0 auto;
	padding: 0.5em 0;
	max-width: 100%;
	overflow-x: auto;
	overflow-y: hidden;
}

/* Math content wrapper for nested figures */
figure > figure[role="math"] > * {
	display: inline-block;
	min-width: max-content;
	text-align: center;
}

/* Inline math - smaller size, aligned with text baseline */
span[role="math"] {
	display: inline-block;
	vertical-align: baseline;
	margin: 0 0.1em;
	text-indent: 0;
}

/*******************************************************************************
RESPONSIVE LAYOUT
*******************************************************************************/

@media (max-width: 760px) {
	/* Margin notes render inline on narrow screens */
	.marginnote {
		display: block;
		float: none;
		position: static;
		padding: 0.85rem 1rem;
		width: 100%;
		margin: 0.5rem 0 1.25rem;
		background: var(--theme-pre-bg);
		border: 1px solid var(--theme-pre-border);
		border-radius: var(--radius-sm);
		box-sizing: border-box;
	}

	.marginnote.is-expanded {
		display: block;
	}

	/* Footnote margin notes collapse by default */
	.footnote-ref + .marginnote {
		display: none;
	}

	.footnote-ref + .marginnote.is-expanded {
		display: block;
	}

	/* Limit image size inside expanded margin notes */
	.marginnote img,
	.marginnote svg {
		max-width: 100%;
		max-height: 50vh;
		margin: 0.4rem auto;
		display: block;
	}

	sup.footnote-ref {
		line-height: 1;
		top: -0.2em;
	}

	sup.footnote-ref > a.footnote-ref-link {
		display: inline-flex;
		align-items: center;
		justify-content: center;
		font-size: 0.75rem;
		line-height: 1;
		min-width: 1.6em;
		height: 1.6em;
		padding: 0 0.4em;
		margin: 0 0.15em;
		border-radius: 999px;
		border: 1px solid var(--theme-pre-border);
		background: var(--theme-pre-bg);
		color: var(--theme-text);
		appearance: none;
		cursor: pointer;
	}

	sup.footnote-ref > a.footnote-ref-link.is-expanded {
		background: var(--highlight-weak);
	}

	/* Enable hyphenation on narrow screens */
	p {
		hyphens: auto;
	}

	/* Full-width quote blocks on mobile */
	div[style*="border-inline-start"] {
		width: 100% !important;
	}

	/* Full-width code blocks on mobile */
	pre {
		width: 100%;
	}

	/* Full-width tables and images on mobile */
	section > img,
	section > svg {
		max-width: 100%;
		left: 0;
		transform: none;
		margin-left: auto;
		margin-right: auto;
	}

	/* Math equations take full width on mobile */
	figure[role="math"] {
		width: 100%;
	}

	/* Blog index rows take full width on mobile */
	.blog-entry {
		width: 100%;
	}

	.article-byline {
		width: 100%;
	}
}

/*******************************************************************************
NAVBAR AND HEADER/FOOTER
*******************************************************************************/

/* Site header and footer should have consistent styling */
header.site-header,
footer {
	font-size: 1.1rem;
	color: #666;
	line-height: 1.6;
}

header.site-header {
	margin-top: 0.5em;
	margin-bottom: 0.5em;
	margin-left: 0.35em;
}

footer {
	margin-top: 2em;
	margin-bottom: 1em;
}

header nav {
	display: flex;
	gap: 1em;
}

header nav > p {
	display: flex;
	gap: inherit;
	margin: 0;
	flex-wrap: wrap;
}

.site-nav a:any-link {
	text-decoration: none;
	border-bottom: 0;
	box-shadow: none;
	font-size: 1.5rem;
	padding: 0.2em 0.4em;
	margin-top: 1em;
	border-radius: var(--radius-sm);
	transition: background-color 120ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
	background: var(--highlight-weak);
	outline: none;
}

/*******************************************************************************
FOOTNOTES AND MARGIN NOTES
*******************************************************************************/

/* Fix footnote line-height inconsistency */
sup.footnote-ref {
	line-height: 0;
	position: relative;
	vertical-align: baseline;
	top: -0.5em;
}

.footnote-ref,
.footnote-ref + .marginnote {
	--highlight: transparent;
	background-color: var(--highlight);
	box-shadow: 0 0 0 5px var(--highlight);
	border-radius: var(--radius-sm);
	transition:
		background-color 0.3s ease 1s,
		box-shadow 0.3s ease 1s;
}

/* Highlight margin note when footnote reference is hovered */
.footnote-ref:hover + .marginnote {
	--highlight: var(--highlight-weak);
	transition-delay: 0s;
}

/* Highlight footnote reference when margin note is hovered */
.footnote-ref:has(+ .marginnote:hover) {
	--highlight: var(--highlight-strong);
	transition-delay: 0s;
}

@media (min-width: 761px) {
	sup.marginnote-ref {
		display: none;
	}
}

/* Fix code size in margin notes (including inside links) */
.marginnote code {
	font-size: inherit;
}

/*******************************************************************************
POST TILES
*******************************************************************************/

.post-tile {
	margin: 0 0 1rem;
}

.post-tile a {
	display: inline-block;
	padding: 0.1em 0.2em;
}

.post-tile a:hover,
.post-tile a:focus-visible {
	background: var(--highlight-weak);
	outline: none;
}

.post-tile h3 {
	margin: 0;
}

.post-tile p {
	margin: 0.25rem 0 0;
}

/*******************************************************************************
BLOG INDEX
*******************************************************************************/

.blog-entry {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 1.5em;
	padding: 1em 0;
	border-bottom: 1px solid var(--theme-table-border, #ccc);
	width: 55%;
}

.blog-entry-content {
	flex: 1;
}

.blog-entry-content a:any-link {
	font-size: 1.5em;
	text-decoration: none;
}

.blog-entry-date {
	flex-shrink: 0;
	color: var(--theme-footer, #777);
	font-size: 1.2em;
	white-space: nowrap;
}

/*******************************************************************************
TABLE OF CONTENTS
*******************************************************************************/

.toc-sidebar {
	position: fixed;
	top: 15rem;
	left: 1%;
	z-index: 10;
	display: none;
	width: 10.5%;
	max-height: calc(100vh - 11rem);
	overflow-y: auto;
	color: var(--theme-line-numbers-text, #aaa);
}

.toc-sidebar ol {
	margin: 0;
	padding: 0;
	list-style: none;
}

.toc-sidebar li {
	margin: 0 0 0.2em;
}

.toc-sidebar .toc-after-title {
	padding-left: 0.8em;
}

.toc-sidebar a:any-link {
	display: block;
	color: inherit;
	font-size: 0.95rem;
	line-height: 1.1;
	text-decoration: none;
	border-left: 1px solid transparent;
	padding-left: 0.6em;
	transition:
		border-color 120ms ease,
		color 120ms ease;
}

.toc-sidebar a:hover,
.toc-sidebar a:focus-visible,
.toc-sidebar a.is-active {
	color: var(--theme-copy-btn-hover-text, #333);
	border-left-color: currentColor;
	outline: none;
}

@media (min-width: 1200px) {
	.toc-sidebar {
		display: block;
	}
}