/* ==========================================================================
   铟子vinds 文章站 — 全站共用样式
   白天模式: 白底黑字    夜间模式: 黑底白字
   ========================================================================== */

:root {
	--c-nav: #08f;
	--c-nav-text: #fff;
	--c-nav-hover: #0ff;

	--c-bg: #fff;
	--c-text: #000;
	--c-muted: #595959;
	--c-line: #d9d9d9;
	--c-soft: #f5f5f5;
	--c-code-bg: #f6f6f6;
	--c-mark: #ffe680;
	--c-link: #0645ad;

	--nav-h: 48px;
	--side-w: 300px;

	color-scheme: light;
}

html[data-theme="dark"] {
	--c-bg: #000;
	--c-text: #fff;
	--c-muted: #a3a3a3;
	--c-line: #333;
	--c-soft: #141414;
	--c-code-bg: #131313;
	--c-mark: #4a3f00;
	--c-link: #6cb6ff;

	color-scheme: dark;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
	margin: 0;
	background: var(--c-bg);
	color: var(--c-text);
	font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
		"PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
	font-size: 16px;
	line-height: 1.75;
}

/* --------------------------------------------------------------- 导航栏 */

.nav {
	position: sticky;
	top: 0;
	z-index: 30;
	height: var(--nav-h);
	display: flex;
	align-items: center;
	gap: 16px;
	padding: 0 16px;
	background: var(--c-nav);
	color: var(--c-nav-text);
}

.nav a {
	color: var(--c-nav-text);
	text-decoration: none;
	transition: color .5s ease;
}

.nav a:hover, .nav a:focus {
	color: var(--c-nav-hover);
	text-decoration: none;   /* 导航栏里悬浮只变色, 不要下划线 */
}

.nav .brand {
	font-size: 17px;
	font-weight: 700;
	white-space: nowrap;
}

.nav .spacer { flex: 1 1 auto; }

.nav .navlink { white-space: nowrap; }

.theme-btn {
	font: inherit;
	line-height: 1;
	color: var(--c-nav-text);
	background: transparent;
	border: 1px solid rgba(255, 255, 255, .55);
	border-radius: 6px;
	padding: 5px 9px;
	cursor: pointer;
	transition: color .5s ease, border-color .5s ease;
}

.theme-btn:hover { border-color: var(--c-nav-hover); color: var(--c-nav-hover); }

.menu-btn {
	display: none;
	font: inherit;
	line-height: 1;
	color: var(--c-nav-text);
	background: transparent;
	border: 1px solid rgba(255, 255, 255, .55);
	border-radius: 6px;
	padding: 5px 9px;
	cursor: pointer;
	transition: color .5s ease, border-color .5s ease;
}

.menu-btn:hover { border-color: var(--c-nav-hover); color: var(--c-nav-hover); }

/* --------------------------------------------------------------- 页面骨架 */

.layout { display: flex; align-items: flex-start; }

.side {
	flex: 0 0 var(--side-w);
	width: var(--side-w);
	border-right: 1px solid var(--c-line);
	padding: 16px 12px 40px;
	position: sticky;
	top: var(--nav-h);
	max-height: calc(100vh - var(--nav-h));
	overflow-y: auto;
}

.side h2 {
	margin: 0 0 4px;
	font-size: 15px;
	font-weight: 700;
}

.side .side-home { font-size: 13px; color: var(--c-muted); }

.side input[type="search"] {
	width: 100%;
	margin: 10px 0 12px;
	padding: 5px 8px;
	font: inherit;
	font-size: 13px;
	color: var(--c-text);
	background: var(--c-bg);
	border: 1px solid var(--c-line);
	border-radius: 6px;
}

.side input[type="search"]:focus { outline: 1px solid var(--c-nav); }

.main {
	flex: 1 1 auto;
	min-width: 0;
}

.doc, .home {
	max-width: 860px;
	margin: 0 auto;
	padding: 28px 28px 64px;
}

/* --------------------------------------------------------------- 首页 */

.home h1 { font-size: 26px; margin: 0 0 6px; }

.home p.lead { color: var(--c-muted); margin: 0 0 26px; }

.subject-list { list-style: none; margin: 0; padding: 0; }

.subject-list > li {
	border: 1px solid var(--c-line);
	border-radius: 8px;
	padding: 14px 16px;
	margin-bottom: 12px;
}

.subject-list a.subject-title { font-size: 18px; font-weight: 700; }

.subject-list .subject-desc {
	color: var(--c-muted);
	font-size: 14px;
	margin: 6px 0 0;
}

.subject-list .subject-articles { font-size: 13px; color: var(--c-muted); margin: 8px 0 0; }

.subject-list .subject-articles a { margin-right: 10px; }

/* --------------------------------------------------------------- 导航树 */

.tree, .tree ul { list-style: none; margin: 0; padding: 0; }

.tree ul { margin-left: 12px; }

.folder-name {
	cursor: pointer;
	font-size: 13px;
	font-weight: 700;
	display: flex;
	align-items: flex-start;
	gap: 4px;
	padding: 3px 2px;
	user-select: none;
}

.folder-name .mark { flex: 0 0 1em; text-align: center; opacity: .7; }

/* 收起: 直接隐藏同级的文章列表 */
.tree li.closed > ul { display: none; }

.tree a {
	display: block;
	font-size: 13.5px;
	line-height: 1.5;
	padding: 3px 2px 3px 8px;
}

.tree a.current { font-weight: 700; }

.tree .hidden { display: none; }

/* --------------------------------------------------------------- 正文 */

.doc h1, .doc h2, .doc h3, .doc h4, .doc h5, .doc h6 {
	line-height: 1.35;
	margin: 1.6em 0 .6em;
	scroll-margin-top: calc(var(--nav-h) + 12px);
}

.doc h1 { font-size: 26px; }
.doc h2 { font-size: 22px; padding-bottom: .2em; border-bottom: 1px solid var(--c-line); }
.doc h3 { font-size: 19px; }
.doc h4 { font-size: 17px; }
.doc h5 { font-size: 16px; }
.doc h6 { font-size: 15px; color: var(--c-muted); }

.doc p { margin: .9em 0; }

.doc ul, .doc ol { margin: .9em 0; padding-left: 1.8em; }
.doc li { margin: .25em 0; }
.doc li > ul, .doc li > ol { margin: .25em 0; }

.doc hr { border: 0; border-top: 1px solid var(--c-line); margin: 2em 0; }

.doc .table-wrap { overflow-x: auto; margin: 1.1em 0; }

.doc table { border-collapse: collapse; font-size: 15px; }

.doc th, .doc td { border: 1px solid var(--c-line); padding: 5px 10px; }

.doc th { background: var(--c-soft); }

.doc blockquote {
	margin: 1em 0;
	padding: .1em 1em;
	border-left: 3px solid var(--c-nav);
	background: var(--c-soft);
	color: var(--c-text);
}

.doc blockquote > :first-child { margin-top: .7em; }
.doc blockquote > :last-child { margin-bottom: .7em; }

.doc code {
	font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
	font-size: .92em;
	background: var(--c-code-bg);
	border: 1px solid var(--c-line);
	border-radius: 4px;
	padding: .1em .35em;
}

.doc pre {
	background: var(--c-code-bg);
	border: 1px solid var(--c-line);
	border-radius: 6px;
	padding: 12px 14px;
	overflow-x: auto;
	margin: 1.1em 0;
}

.doc pre code {
	background: none;
	border: 0;
	padding: 0;
	font-size: 13.5px;
	line-height: 1.6;
}

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

.doc mark { background: var(--c-mark); color: inherit; padding: 0 .15em; }

/* 原文有笔误、渲染不出来的公式: 原样显示 LaTeX 源码, 不做成红色报错 */
.doc .math-raw {
	font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
	font-size: .92em;
	color: var(--c-muted);
	background: var(--c-code-bg);
	border-radius: 4px;
	padding: 0 .2em;
	word-break: break-all;
}

.doc .math-display.math-raw {
	display: block;
	padding: .6em .8em;
	margin: 1em 0;
	overflow-x: auto;
	white-space: pre-wrap;
}

.doc .graph-block {
	margin: 1.1em 0;
	text-align: center;
}

.doc .graph-block svg {
	display: block;
	width: 100%;
	max-width: 800px;
	height: auto;
	margin: 0 auto;
	color: var(--c-text);
}

.doc .footnote { font-size: 14px; color: var(--c-muted); }

.doc .doc-title {
	margin: 0 0 4px;
	font-size: 15px;
	font-weight: 400;
	color: var(--c-muted);
}

.doc .status { color: var(--c-muted); }

/* 上一篇 / 下一篇 */
.doc .pager {
	display: flex;
	justify-content: space-between;
	gap: 16px;
	margin: 2.4em 0 0;
	padding-top: 1em;
	border-top: 1px solid var(--c-line);
	font-size: 15px;
}

.doc .pager .next { margin-left: auto; text-align: right; }

.doc .pager .none { color: var(--c-muted); }

.doc .pager a { max-width: 46%; }

/* 链接: 正常颜色, 默认无下划线, 悬浮才出现下划线 */
a { color: var(--c-link); text-decoration: none; }

a:hover, a:focus { text-decoration: underline; }

.doc .anchor {
	margin-left: .35em;
	font-size: .72em;
	opacity: 0;
	font-weight: 400;
}

.doc h1:hover .anchor, .doc h2:hover .anchor, .doc h3:hover .anchor,
.doc h4:hover .anchor, .doc h5:hover .anchor, .doc h6:hover .anchor { opacity: .65; }

/* --------------------------------------------------------------- 页脚 */

.foot {
	border-top: 1px solid var(--c-line);
	text-align: center;
	font-size: 14px;
	color: var(--c-muted);
	padding: 18px 16px 26px;
}

.foot p { margin: 0; }

.foot a { color: var(--c-link); }

/* --------------------------------------------------------------- 窄屏 */

@media (max-width: 860px) {
	.menu-btn { display: inline-block; }

	.layout { display: block; }

	.side {
		display: none;
		position: fixed;
		top: var(--nav-h);
		left: 0;
		bottom: 0;
		width: min(86vw, var(--side-w));
		max-height: none;
		z-index: 20;
		background: var(--c-bg);
		box-shadow: 0 0 0 1px var(--c-line);
	}

	body.side-open .side { display: block; }

	.doc, .home { padding: 20px 16px 48px; }
}