/* ==========================================================================
   nova · 基础层
   设计令牌 / 元素基线 / 页面骨架 / 顶栏 / 头部 / 导航 / 页脚 / 工具类
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 设计令牌
   -------------------------------------------------------------------------- */
:root {
	/* 主色与语义色 */
	--nv-accent: #3c82cd;
	--nv-accent-dark: #2f6cae;
	--nv-accent-soft: #edf4fb;
	--nv-on-accent: #fff;

	/* 文字层级 */
	--nv-heading: #2d425a;
	--nv-text: #5d7188;
	--nv-muted: #8496aa;
	--nv-light: #a2b0c0;

	/* 表面与描边 */
	--nv-canvas: #f6f8fb;
	--nv-surface: #fff;
	--nv-sunken: #f6f8fb;
	--nv-border: #f5f6f7;
	--nv-line: #edf0f4;
	--nv-input-border: #dadfe6;

	/* 状态色 */
	--nv-danger: #d9485f;
	--nv-warn: #c98a1b;
	--nv-success: #2b936b;

	/* 尺度 */
	--nv-radius: 8px;
	--nv-radius-lg: 14px;
	--nv-gap: 20px;
	--nv-pad: 24px;
	--nv-width: 1280px;
	--nv-side: 300px;

	/* 阴影 */
	--nv-shadow: 0 1px 3px rgba(98, 124, 153, .05);
	--nv-shadow-hover: 0 8px 24px rgba(24, 39, 58, .12);

	/* 动效 */
	--nv-ease: cubic-bezier(.4, 0, .2, 1);
	--nv-speed: .18s;
}

/* --------------------------------------------------------------------------
   2. 元素基线
   -------------------------------------------------------------------------- */
html {
	-webkit-text-size-adjust: 100%;
}

body {
	margin: 0;
	background: var(--nv-canvas);
	color: var(--nv-text);
	font: 14px/1.7 Tahoma, Helvetica, "Microsoft Yahei", "PingFang SC", sans-serif;
	-webkit-font-smoothing: antialiased;
}

body,
ul,
ol,
li,
dl,
dd,
p,
h1,
h2,
h3,
h4,
h5,
h6,
form,
fieldset,
figure {
	margin: 0;
	padding: 0;
}

ul,
ol {
	list-style: none;
}

table {
	border-collapse: collapse;
	border-spacing: 0;
}

th,
td {
	text-align: left;
	font-weight: 400;
}

caption {
	text-align: left;
}

img {
	border: 0;
	vertical-align: middle;
	max-width: 100%;
}

a {
	color: var(--nv-text);
	text-decoration: none;
	transition: color var(--nv-speed) var(--nv-ease);
}

a:hover {
	color: var(--nv-accent);
	text-decoration: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
	color: var(--nv-heading);
	font-size: 16px;
	font-weight: 600;
	line-height: 1.5;
}

em,
cite,
i {
	font-style: normal;
}

hr {
	height: 1px;
	margin: 16px 0;
	border: 0;
	background: var(--nv-line);
}

:focus-visible {
	outline: 2px solid var(--nv-accent);
	outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   3. 页面骨架
   -------------------------------------------------------------------------- */
.wp {
	box-sizing: border-box;
	width: 100%;
	max-width: var(--nv-width);
	margin: 0 auto;
	padding: 0 20px;
}

/* Discuz 的结构里 #ct 本身也是 .wp（外层还有一个 .wp），
   横向内边距只能留一层，否则窄屏会被 padding 顶出视口 */
.wp .wp,
.wp .wp.cl {
	padding-left: 0;
	padding-right: 0;
}

#wp {
	padding-bottom: 40px;
}

#ct {
	box-sizing: border-box;
	padding-top: var(--nv-gap);
}

/* 双栏：主体 + 侧栏 */
.nv-columns {
	display: grid;
	grid-template-columns: minmax(0, 1fr) var(--nv-side);
	gap: var(--nv-gap);
	align-items: start;
}

.nv-columns > .nv-main {
	min-width: 0;
}

.nv-columns > .nv-side {
	position: sticky;
	top: 20px;
	min-width: 0;
}

/* --------------------------------------------------------------------------
   4. 顶栏
   -------------------------------------------------------------------------- */
#toptb {
	background: var(--nv-surface);
	border-bottom: 1px solid var(--nv-border);
	color: var(--nv-muted);
	font-size: 12px;
	line-height: 38px;
}

#toptb .wp {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 12px;
	min-height: 38px;
}

#toptb .z,
#toptb .y {
	display: flex;
	align-items: center;
	flex-wrap: wrap;
	gap: 2px;
}

#toptb .y {
	margin-left: auto;
}

#toptb a {
	display: inline-flex;
	align-items: center;
	height: 30px;
	padding: 0 8px;
	border-radius: var(--nv-radius);
	color: var(--nv-muted);
}

#toptb a:hover {
	background: var(--nv-canvas);
	color: var(--nv-accent);
}

#toptb .switchwidth,
#toptb #sslct {
	justify-content: center;
	width: 32px;
	padding: 0 !important;
	overflow: hidden;
	color: var(--nv-light);
	font-size: 0;
}

#toptb .switchwidth::before {
	content: "\2932";
	font-size: 15px;
}

/* 配色选择器 */
.nv-palette {
	position: relative;
}

.nv-palette-trigger {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 32px;
	height: 30px;
	padding: 0;
	border: 1px solid transparent;
	border-radius: var(--nv-radius);
	background: none;
	color: var(--nv-muted);
	cursor: pointer;
}

.nv-palette-trigger:hover {
	border-color: var(--nv-accent);
	color: var(--nv-accent);
}

.nv-palette-menu {
	position: absolute;
	top: calc(100% + 8px);
	right: 0;
	z-index: 60;
	width: 232px;
	padding: 14px;
	border: 1px solid var(--nv-border);
	border-radius: var(--nv-radius-lg);
	background: var(--nv-surface);
	box-shadow: var(--nv-shadow-hover);
}

.nv-palette-menu[hidden] {
	display: none;
}

.nv-palette-menu strong {
	display: block;
	color: var(--nv-heading);
	font-size: 14px;
}

.nv-palette-menu p {
	margin: 4px 0 12px;
	color: var(--nv-muted);
	font-size: 12px;
	line-height: 1.6;
}

.nv-palette-options {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 6px;
}

.nv-palette-options button {
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 5px;
	padding: 7px 2px;
	border: 1px solid transparent;
	border-radius: var(--nv-radius);
	background: none;
	color: var(--nv-muted);
	font-size: 11px;
	cursor: pointer;
}

.nv-palette-options button:hover {
	background: var(--nv-canvas);
	color: var(--nv-heading);
}

.nv-palette-options button[aria-pressed="true"] {
	border-color: var(--nv-accent);
	color: var(--nv-accent);
}

.nv-palette-options i {
	display: block;
	width: 18px;
	height: 18px;
	border-radius: 50%;
	background: var(--nv-accent);
}

/* --------------------------------------------------------------------------
   5. 头部：logo / 搜索 / 登录注册
   -------------------------------------------------------------------------- */
#hd {
	background: var(--nv-surface);
}

#hd .hdc {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: space-between;
	gap: 16px 24px;
	min-height: 88px;
	padding: 18px 0;
}

#hd h2 {
	flex: 0 0 auto;
	max-width: 100%;
}

.nv-logo {
	display: flex;
	align-items: center;
	gap: 10px;
	color: var(--nv-heading);
}

.nv-logo:hover {
	color: var(--nv-heading);
}

.nv-logo-mark {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 36px;
	height: 36px;
	border-radius: 11px;
	background: var(--nv-accent);
	color: #fff;
	font-size: 20px;
	font-weight: 700;
	line-height: 1;
	letter-spacing: -.5px;
}

.nv-logo-word {
	color: var(--nv-heading);
	font-size: 21px;
	font-weight: 700;
	letter-spacing: .5px;
}

.nv-logo-site {
	padding-left: 10px;
	border-left: 1px solid var(--nv-line);
	color: var(--nv-muted);
	font-size: 13px;
	font-weight: 400;
	letter-spacing: 1px;
}

/* 搜索 */
.nv-search {
	position: relative;
}

.nv-search summary {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 36px;
	height: 36px;
	border-radius: var(--nv-radius);
	color: var(--nv-muted);
	cursor: pointer;
	list-style: none;
}

.nv-search summary::-webkit-details-marker {
	display: none;
}

.nv-search summary:hover {
	background: var(--nv-canvas);
	color: var(--nv-accent);
}

.nv-search form {
	position: absolute;
	top: calc(100% + 8px);
	right: 0;
	z-index: 60;
	display: flex;
	align-items: center;
	gap: 6px;
	padding: 8px;
	border: 1px solid var(--nv-border);
	border-radius: var(--nv-radius-lg);
	background: var(--nv-surface);
	box-shadow: var(--nv-shadow-hover);
}

.nv-search input[type="search"] {
	width: 210px;
	height: 34px;
	padding: 0 12px;
	border: 1px solid var(--nv-input-border);
	border-radius: var(--nv-radius);
	background: var(--nv-surface);
	color: var(--nv-text);
	font: inherit;
	font-size: 13px;
	outline: none;
}

.nv-search input[type="search"]::placeholder {
	color: var(--nv-light);
}

.nv-search input[type="search"]:focus {
	border-color: var(--nv-accent);
	box-shadow: 0 0 0 3px var(--nv-accent-soft);
}

.nv-search button {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 34px;
	height: 34px;
	padding: 0;
	border: 0;
	border-radius: var(--nv-radius);
	background: var(--nv-accent);
	color: #fff;
	cursor: pointer;
}

.nv-search button:hover {
	background: var(--nv-accent-dark);
}

/* 登录 / 注册 */
.nv-actions {
	display: flex;
	align-items: center;
	flex-wrap: wrap;
	justify-content: flex-end;
	gap: 12px;
	margin-left: auto;
	min-width: 0;
}

.nv-actions > * {
	min-width: 0;
}

.nv-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 6px;
	height: 36px;
	padding: 0 18px;
	border: 1px solid transparent;
	border-radius: var(--nv-radius);
	background: var(--nv-accent);
	color: var(--nv-on-accent);
	font-size: 14px;
	line-height: 1;
	cursor: pointer;
	transition: background var(--nv-speed) var(--nv-ease), color var(--nv-speed) var(--nv-ease), border-color var(--nv-speed) var(--nv-ease);
}

.nv-btn:hover {
	background: var(--nv-accent-dark);
	color: #fff;
}

.nv-btn-ghost {
	border-color: var(--nv-input-border);
	background: var(--nv-surface);
	color: var(--nv-text);
}

.nv-btn-ghost:hover {
	border-color: var(--nv-accent);
	background: var(--nv-surface);
	color: var(--nv-accent);
}

.nv-link {
	color: var(--nv-muted);
}

.nv-link:hover {
	color: var(--nv-accent);
}

/* 登录后账户菜单 */
.nv-account {
	position: relative;
}

.nv-account-trigger {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	height: 36px;
	padding: 0 12px 0 4px;
	border-radius: 18px;
	color: var(--nv-heading);
}

.nv-account-trigger:hover {
	background: var(--nv-canvas);
	color: var(--nv-heading);
}

.nv-account-trigger img {
	width: 28px;
	height: 28px;
	border-radius: 50%;
}

.nv-account-menu {
	position: absolute;
	top: calc(100% + 8px);
	right: 0;
	z-index: 60;
	min-width: 168px;
	padding: 6px;
	border: 1px solid var(--nv-border);
	border-radius: var(--nv-radius-lg);
	background: var(--nv-surface);
	box-shadow: var(--nv-shadow-hover);
}

.nv-account-menu[hidden] {
	display: none;
}

.nv-account-menu a {
	display: block;
	padding: 8px 12px;
	border-radius: var(--nv-radius);
	color: var(--nv-text);
	font-size: 13px;
}

.nv-account-menu a:hover {
	background: var(--nv-canvas);
	color: var(--nv-accent);
}

.nv-account-menu hr {
	margin: 4px 0;
}

/* --------------------------------------------------------------------------
   6. 主导航
   -------------------------------------------------------------------------- */
#nv {
	box-sizing: border-box;
	background: var(--nv-surface);
	border-bottom: 1px solid var(--nv-border);
}

#nv > ul {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 2px;
}

#nv li {
	position: relative;
}

#nv li > a {
	display: flex;
	align-items: baseline;
	gap: 5px;
	height: 52px;
	padding: 0 18px;
	color: var(--nv-heading);
	font-size: 15px;
	line-height: 52px;
}

#nv li > a span {
	color: var(--nv-light);
	font-size: 11px;
	font-weight: 400;
	letter-spacing: .3px;
	text-transform: uppercase;
}

#nv li > a:hover {
	color: var(--nv-accent);
}

#nv li > a:hover span {
	color: var(--nv-accent);
}

#nv li.a > a {
	color: var(--nv-accent);
	font-weight: 600;
}

/* 带下拉的导航项 */
#nv li.nv-has-sub > a::after {
	content: "";
	width: 5px;
	height: 5px;
	margin-left: 2px;
	border-right: 1.5px solid currentColor;
	border-bottom: 1.5px solid currentColor;
	transform: translateY(-2px) rotate(45deg);
	opacity: .6;
}

#nv .nv-sub {
	position: absolute;
	top: 100%;
	left: 0;
	z-index: 60;
	display: none;
	min-width: 160px;
	padding: 6px;
	border: 1px solid var(--nv-border);
	border-radius: var(--nv-radius-lg);
	background: var(--nv-surface);
	box-shadow: var(--nv-shadow-hover);
}

#nv li:hover > .nv-sub {
	display: block;
}

#nv .nv-sub a {
	display: block;
	padding: 8px 12px;
	border-radius: var(--nv-radius);
	color: var(--nv-text);
	font-size: 13px;
	line-height: 1.6;
}

#nv .nv-sub a:hover {
	background: var(--nv-canvas);
	color: var(--nv-accent);
}

/* 溢出菜单 */
.nv-nav-more {
	position: relative;
	margin-left: auto;
}

.nv-nav-more summary {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 38px;
	height: 52px;
	color: var(--nv-muted);
	cursor: pointer;
	list-style: none;
}

.nv-nav-more summary::-webkit-details-marker {
	display: none;
}

.nv-nav-more-menu {
	position: absolute;
	top: 100%;
	right: 0;
	z-index: 60;
	min-width: 160px;
	padding: 6px;
	border: 1px solid var(--nv-border);
	border-radius: var(--nv-radius-lg);
	background: var(--nv-surface);
	box-shadow: var(--nv-shadow-hover);
}

.nv-nav-more-menu[hidden] {
	display: none;
}

.nv-nav-more-menu a {
	display: block;
	padding: 8px 12px;
	border-radius: var(--nv-radius);
	color: var(--nv-text);
	font-size: 13px;
}

.nv-nav-more-menu a:hover {
	background: var(--nv-canvas);
	color: var(--nv-accent);
}

/* --------------------------------------------------------------------------
   7. 页脚
   -------------------------------------------------------------------------- */
#ft {
	margin-top: 30px;
	padding: 24px 0 32px;
	border-top: 1px solid var(--nv-border);
	color: var(--nv-muted);
	font-size: 12px;
}

#ft .wp {
	display: block;
}

#ft #flk {
	float: none;
}

#ft #frt {
	text-align: left;
}

#ft a {
	color: var(--nv-muted);
}

#ft a:hover {
	color: var(--nv-accent);
}

.nv-footer-links {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 4px 10px;
	margin-bottom: 10px;
}

.nv-footer-links strong a {
	color: var(--nv-heading);
	font-weight: 600;
}

.nv-footer-copy {
	margin-bottom: 4px;
	color: var(--nv-muted);
}

.nv-footer-copy strong {
	color: var(--nv-heading);
	font-weight: 600;
}

.nv-footer-copy em {
	font-style: normal;
}

.nv-footer-meta {
	margin-top: 4px;
	color: var(--nv-light);
}

/* --------------------------------------------------------------------------
   8. 工具类
   -------------------------------------------------------------------------- */
.fl {
	float: left;
}

.fr {
	float: right;
}

.cl {
	clear: both;
}

.mt {
	margin-top: 12px;
}

.mb {
	margin-bottom: 12px;
}

.mb0 {
	margin-bottom: 0;
}

.xs0 {
	font-size: 12px;
}

.xst {
	color: var(--nv-heading);
	font-size: 15px;
	font-weight: 600;
}

.pipe {
	color: var(--nv-line);
}

.bar {
	margin-bottom: 16px;
	padding-bottom: 8px;
	border-bottom: 1px solid var(--nv-line);
	color: var(--nv-heading);
	font-size: 15px;
	font-weight: 600;
}

.nv-sr-only {
	position: absolute;
	width: 1px;
	height: 1px;
	margin: -1px;
	padding: 0;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}

.nv-divider {
	height: 1px;
	margin: 16px 0;
	background: var(--nv-line);
}

/* 回到顶部 */
.nv-backtop {
	position: fixed;
	right: 24px;
	bottom: 24px;
	z-index: 40;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 40px;
	height: 40px;
	border: 1px solid var(--nv-border);
	border-radius: 50%;
	background: var(--nv-surface);
	box-shadow: var(--nv-shadow-hover);
	color: var(--nv-muted);
	cursor: pointer;
	opacity: 0;
	pointer-events: none;
	transition: opacity var(--nv-speed) var(--nv-ease), color var(--nv-speed) var(--nv-ease);
}

.nv-backtop.is-visible {
	opacity: 1;
	pointer-events: auto;
}

.nv-backtop:hover {
	color: var(--nv-accent);
}

/* --------------------------------------------------------------------------
   9. 窄屏适配
   -------------------------------------------------------------------------- */
@media (max-width: 1100px) {
	.nv-columns {
		grid-template-columns: minmax(0, 1fr);
	}

	.nv-columns > .nv-side {
		position: static;
	}
}

@media (max-width: 760px) {
	:root {
		--nv-pad: 16px;
	}

	.wp {
		padding: 0 14px;
	}

	.wp .wp,
	.wp .wp.cl {
		padding-left: 0;
		padding-right: 0;
	}

	#hd .hdc {
		min-height: 0;
	}

	.nv-search input[type="search"] {
		width: 128px;
	}

	.nv-actions {
		gap: 8px;
	}

	#nv li > a {
		padding: 0 12px;
		font-size: 14px;
	}

	/* 移动端护栏：表格与长文本不得撑破视口 */
	.nv-page table,
	.nv-page .tl table,
	.nv-page .plhin {
		max-width: 100%;
	}


	.nv-page td,
	.nv-page th,
	.nv-page p,
	.nv-page h1,
	.nv-page h2,
	.nv-page h3 {
		word-break: break-word;
		overflow-wrap: anywhere;
	}

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

/* --------------------------------------------------------------------------
   10. 悬浮工具条
   -------------------------------------------------------------------------- */
.nv-float-tools {
	position: fixed;
	right: 18px;
	bottom: 60px;
	z-index: 40;
	display: flex;
	flex-direction: column;
	align-items: flex-end;
	gap: 8px;
}

.nv-float-tools a,
.nv-float-tools button {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 38px;
	height: 38px;
	padding: 0;
	border: 1px solid var(--nv-border);
	border-radius: 50%;
	background: var(--nv-surface);
	box-shadow: var(--nv-shadow-hover);
	color: var(--nv-muted);
	font-size: 12px;
	cursor: pointer;
	transition: color var(--nv-speed) var(--nv-ease), border-color var(--nv-speed) var(--nv-ease);
}

.nv-float-tools a:hover,
.nv-float-tools button:hover {
	border-color: var(--nv-accent);
	color: var(--nv-accent);
}

.nv-float-tools .nv-float-reply,
.nv-float-tools .nv-float-list {
	width: auto;
	height: 30px;
	padding: 0 12px;
	border-radius: 15px;
	font-size: 12px;
}

/* 悬浮工具条里的“回到顶部”按钮 */
.nv-float-top {
	color: var(--nv-muted);
}

/* 主题钩子类：模板本身不依赖它，供站点自定义样式使用 */
body.nv-ui {
	color-scheme: light;
}