/* ==========================================================================
   有得CMS 官网主题
   手写、无预处理器、无 CDN。所有颜色走 CSS 变量，深浅色只切换变量取值，
   组件规则只写一次——这样新增区块不必再各写一遍 prefers-color-scheme 分支。
   ========================================================================== */

/* --- 设计令牌 ---------------------------------------------------------- */
:root {
    --bg:        #ffffff;
    --bg-soft:   #f7f8fa;
    --bg-sunk:   #f1f3f6;
    --fg:        #15181e;
    --fg-dim:    #4d5666;
    --fg-mute:   #6b7484;
    --line:      #e3e7ec;
    --line-soft: #edf0f4;
    --acc:       #2f5fe0;
    --acc-fg:    #ffffff;
    --acc-soft:  #eef2fe;
    /* 核心的 404 页用了 var(--primary)，这里必须给出定义，否则那一页会掉回硬编码深蓝 */
    --primary:   var(--acc);

    --code-bg:   #f7f8fa;
    --tok-cmt:   #79828f;
    --tok-str:   #16794f;
    --tok-kw:    #7a3fbf;
    --tok-num:   #a8500a;
    --tok-var:   #0b5ca6;
    --tok-flag:  #9a4a00;
    --tok-key:   #0b5ca6;
    --tok-tag:   #7a3fbf;

    --r:   8px;
    --r-l: 14px;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
            "Microsoft YaHei", "Noto Sans CJK SC", Roboto, Helvetica, Arial, sans-serif;
    --mono: ui-monospace, SFMono-Regular, "SF Mono", "Cascadia Mono", "JetBrains Mono",
            Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg:        #0e1116;
        --bg-soft:   #12161d;
        --bg-sunk:   #171c24;
        --fg:        #e6e9ee;
        --fg-dim:    #b3bcc9;
        --fg-mute:   #8d97a6;
        --line:      #242a34;
        --line-soft: #1c2129;
        --acc:       #7ea6ff;
        --acc-fg:    #0e1116;
        --acc-soft:  #182135;

        --code-bg:   #12161d;
        --tok-cmt:   #6d7686;
        --tok-str:   #7ddfae;
        --tok-kw:    #c8a6f7;
        --tok-num:   #f0a868;
        --tok-var:   #80c9f8;
        --tok-flag:  #f0a868;
        --tok-key:   #80c9f8;
        --tok-tag:   #c8a6f7;
    }
}

/* --- 基础 -------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
    /* 锚点跳转要避开吸顶导航，否则点目录会把标题顶到 header 底下 */
    scroll-padding-top: 84px;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font: 16px/1.75 var(--sans);
    -webkit-font-smoothing: antialiased;
    /* 任何子元素都不该把整页撑出横向滚动条；宽内容自己在容器里滚 */
    overflow-x: hidden;
}

a { color: var(--acc); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }
h1, h2, h3, h4 { line-height: 1.3; font-weight: 650; letter-spacing: -.01em; margin: 0; }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.4em; }
li { margin: .3em 0; }
hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }
code, pre, kbd, samp { font-family: var(--mono); font-size: .9em; }

:focus-visible { outline: 2px solid var(--acc); outline-offset: 2px; border-radius: 4px; }

.skip {
    position: absolute; left: -9999px; top: 0; z-index: 200;
    background: var(--acc); color: var(--acc-fg); padding: 10px 16px; border-radius: 0 0 var(--r) 0;
}
.skip:focus { left: 0; }

.wrap, .container { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.wrap.narrow, .container.narrow { max-width: 760px; }
.muted { color: var(--fg-mute); }
.section { padding: 72px 0; }
.sep { margin: 0 .5em; color: var(--line); }

/* --- 按钮 -------------------------------------------------------------- */
.btn, .btn-more, .btn-link {
    display: inline-flex; align-items: center; gap: .45em;
    padding: 11px 20px; border-radius: var(--r);
    border: 1px solid var(--acc); background: var(--acc); color: var(--acc-fg);
    font-size: 15px; font-weight: 600; line-height: 1.2; cursor: pointer;
    transition: background .15s, border-color .15s, color .15s, opacity .15s;
}
.btn:hover, .btn-more:hover, .btn-link:hover { text-decoration: none; opacity: .88; }
.btn-ghost { background: transparent; color: var(--fg); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--acc); color: var(--acc); opacity: 1; }
.btn-sm { padding: 7px 14px; font-size: 14px; }
.btn[aria-disabled="true"] { opacity: .5; cursor: not-allowed; pointer-events: none; }
.btn-link { background: transparent; border: 0; color: var(--acc); padding: 0; }

/* --- 头部导航 ---------------------------------------------------------- */
.hdr {
    position: sticky; top: 0; z-index: 60;
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: saturate(160%) blur(10px);
    border-bottom: 1px solid var(--line);
}
@supports not (backdrop-filter: blur(1px)) { .hdr { background: var(--bg); } }

.hdr-in { display: flex; align-items: center; gap: 28px; height: 62px; }

.brand { display: inline-flex; align-items: center; gap: 9px; color: var(--fg); font-weight: 700; letter-spacing: -.015em; }
.brand:hover { text-decoration: none; }
.brand-logo { height: 28px; width: auto; }
.brand-mark {
    display: inline-grid; place-items: center; width: 26px; height: 26px; flex: none;
    border-radius: 6px; background: var(--acc); color: var(--acc-fg);
    font: 600 11px/1 var(--mono);
}

.nav { display: flex; align-items: center; gap: 24px; margin-left: auto; }
.nav-list { display: flex; align-items: center; gap: 4px; list-style: none; margin: 0; padding: 0; }
.nav-list > li { position: relative; margin: 0; }
.nav-list > li > a {
    display: block; padding: 7px 12px; border-radius: var(--r);
    color: var(--fg-dim); font-size: 15px; font-weight: 520;
}
.nav-list > li > a:hover { background: var(--bg-sunk); color: var(--fg); text-decoration: none; }
.nav-list > li > a.on { color: var(--acc); background: var(--acc-soft); }

.sub {
    position: absolute; left: 0; top: 100%; min-width: 168px; margin: 0; padding: 6px;
    list-style: none; background: var(--bg); border: 1px solid var(--line);
    border-radius: var(--r); box-shadow: 0 8px 28px rgb(0 0 0 / .09);
    opacity: 0; visibility: hidden; transform: translateY(-4px);
    transition: opacity .14s, transform .14s, visibility .14s;
}
.has-sub:hover > .sub, .has-sub:focus-within > .sub { opacity: 1; visibility: visible; transform: none; }
.sub a { display: block; padding: 7px 10px; border-radius: 6px; color: var(--fg-dim); font-size: 14px; }
.sub a:hover { background: var(--bg-sunk); color: var(--fg); text-decoration: none; }

.nav-side { display: flex; align-items: center; gap: 14px; }
.langs { display: inline-flex; gap: 8px; font-size: 14px; }
.langs a { color: var(--fg-mute); }
.langs a.on { color: var(--fg); font-weight: 600; }

/* 桌面端整个开关退出文档流与 Tab 序；移动端才把它变成「看不见但可聚焦」 */
.nav-cb, .nav-burger { display: none; }

/* --- 首页 Hero --------------------------------------------------------- */
.hero { padding: 96px 0 72px; text-align: center; border-bottom: 1px solid var(--line-soft); }
.eyebrow {
    display: inline-flex; align-items: center; gap: .5em; margin-bottom: 22px;
    padding: 5px 13px; border-radius: 999px;
    border: 1px solid var(--line); background: var(--bg-soft);
    color: var(--fg-dim); font: 500 13px/1.4 var(--mono);
}
.eyebrow .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--acc); }
.hero h1 { font-size: clamp(30px, 5.4vw, 50px); letter-spacing: -.028em; margin-bottom: 20px; }
.hero-sub { max-width: 620px; margin: 0 auto 32px; color: var(--fg-dim); font-size: clamp(16px, 2.1vw, 18px); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 34px; }

.taglist { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; list-style: none; margin: 0; padding: 0; }
.taglist li {
    margin: 0; padding: 5px 12px; border-radius: 999px;
    border: 1px solid var(--line); background: var(--bg);
    color: var(--fg-mute); font: 500 13px/1.5 var(--mono);
}

/* --- 通用页头 ---------------------------------------------------------- */
.phead { padding: 64px 0 44px; border-bottom: 1px solid var(--line-soft); background: var(--bg-soft); }
.phead h1 { font-size: clamp(26px, 4.2vw, 38px); letter-spacing: -.022em; }
.phead p { max-width: 680px; margin: 14px 0 0; color: var(--fg-dim); }
.crumb { margin-bottom: 14px; color: var(--fg-mute); font-size: 14px; }
.crumb a { color: var(--fg-mute); }

.shead { margin-bottom: 32px; }
.shead h2 { font-size: clamp(21px, 3vw, 27px); letter-spacing: -.018em; }
.shead p { margin: 10px 0 0; color: var(--fg-mute); max-width: 640px; }

/* --- 卡片网格 ---------------------------------------------------------- */
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(258px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }

.card {
    display: block; padding: 22px; border: 1px solid var(--line);
    border-radius: var(--r-l); background: var(--bg); color: inherit;
    transition: border-color .16s, background .16s;
}
a.card:hover { border-color: var(--acc); background: var(--bg-soft); text-decoration: none; }
.card h3 { font-size: 16px; margin-bottom: 8px; }
.card p { margin: 0; color: var(--fg-mute); font-size: 14.5px; line-height: 1.7; }
.card .idx { display: block; margin-bottom: 12px; color: var(--acc); font: 600 12px/1 var(--mono); letter-spacing: .06em; }
.card .more { display: inline-block; margin-top: 12px; font-size: 14px; font-weight: 600; }

/* --- 代码块 ------------------------------------------------------------ */
.codeblock {
    margin: 0 0 20px; border: 1px solid var(--line); border-radius: var(--r-l);
    background: var(--code-bg); overflow: hidden;
}
.code-head {
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    padding: 9px 16px; border-bottom: 1px solid var(--line);
    background: var(--bg-soft); color: var(--fg-mute); font: 500 12.5px/1.5 var(--mono);
}
.code-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.code-lang { flex: none; text-transform: uppercase; letter-spacing: .07em; opacity: .75; }
/* 宽代码只在这里横滚，页面本体不动 */
pre.code { margin: 0; padding: 16px 18px; overflow-x: auto; line-height: 1.7; tab-size: 4; }
pre.code code { display: block; white-space: pre; font-size: 13.5px; }

.tok-cmt  { color: var(--tok-cmt); font-style: italic; }
.tok-str  { color: var(--tok-str); }
.tok-kw   { color: var(--tok-kw); font-weight: 600; }
.tok-num  { color: var(--tok-num); }
.tok-var  { color: var(--tok-var); }
.tok-flag { color: var(--tok-flag); }
.tok-key  { color: var(--tok-key); }
.tok-tag  { color: var(--tok-tag); font-weight: 600; }

/* --- 正文排版（富文本 / 文档正文共用） --------------------------------- */
.prose { font-size: 16px; line-height: 1.85; color: var(--fg-dim); }
.prose > :first-child { margin-top: 0; }
.prose h2 {
    margin: 46px 0 16px; padding-top: 10px; font-size: 23px;
    letter-spacing: -.018em; color: var(--fg); border-top: 1px solid var(--line-soft);
}
.prose h3 { margin: 32px 0 12px; font-size: 18px; color: var(--fg); }
.prose h4 { margin: 24px 0 10px; font-size: 16px; color: var(--fg); }
.prose strong { color: var(--fg); font-weight: 640; }
.prose ul, .prose ol { padding-left: 1.35em; }
.prose li > code, .prose p > code, .prose td > code, .prose h2 > code, .prose h3 > code {
    padding: .12em .42em; border: 1px solid var(--line);
    border-radius: 5px; background: var(--bg-sunk); color: var(--fg);
    font-size: .875em; word-break: break-word;
}
.prose blockquote {
    margin: 22px 0; padding: 2px 18px; border-left: 3px solid var(--acc);
    background: var(--acc-soft); border-radius: 0 var(--r) var(--r) 0; color: var(--fg-dim);
}
.prose blockquote p:last-child { margin-bottom: 0; }
.prose blockquote p:first-child { margin-top: 1em; }
.prose img { border: 1px solid var(--line); border-radius: var(--r); }
.prose .codeblock { margin: 22px 0; }

/* 宽表格自己横滚；不给它，窄屏上整页会被表格拽歪 */
.table-wrap { margin: 22px 0; overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r-l); }
.table-wrap table { margin: 0; border: 0; }
.prose table { width: 100%; min-width: 460px; border-collapse: collapse; font-size: 14.5px; }
.prose th, .prose td { padding: 10px 14px; border-bottom: 1px solid var(--line-soft); text-align: left; vertical-align: top; }
.prose thead th { background: var(--bg-soft); color: var(--fg); font-weight: 620; white-space: nowrap; }
.prose tbody tr:last-child td { border-bottom: 0; }

/* --- 首页：目录结构对照 ------------------------------------------------ */
.split { display: grid; gap: 32px; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start; }
.split .codeblock { margin: 0; }

/* --- 特点页 ------------------------------------------------------------ */
.fgroup { padding: 40px 0; border-top: 1px solid var(--line-soft); }
.fgroup:first-child { border-top: 0; padding-top: 8px; }
.fgroup-head { margin-bottom: 18px; }
.fgroup-head h2 { font-size: 21px; letter-spacing: -.016em; }
.fgroup-head .note { margin: 6px 0 0; color: var(--fg-mute); font-size: 14.5px; }
.fgroup .prose ul { list-style: none; padding: 0; display: grid; gap: 10px; }
.fgroup .prose ul > li {
    margin: 0; padding: 13px 16px 13px 38px; position: relative;
    border: 1px solid var(--line); border-radius: var(--r); background: var(--bg);
    font-size: 15px; line-height: 1.7;
}
.fgroup .prose ul > li::before {
    content: ""; position: absolute; left: 16px; top: 1.42em;
    width: 7px; height: 7px; border-radius: 2px; background: var(--acc);
}

/* --- 更新历史 ---------------------------------------------------------- */
.rel { display: grid; grid-template-columns: 168px 1fr; gap: 28px; padding: 34px 0; border-top: 1px solid var(--line-soft); }
.rel:first-child { border-top: 0; }
.rel-meta { position: sticky; top: 84px; align-self: start; }
.rel-ver { font: 700 20px/1.3 var(--mono); letter-spacing: -.02em; }
.rel-date { display: block; margin-top: 4px; color: var(--fg-mute); font-size: 14px; }
.chip {
    display: inline-block; margin-top: 10px; padding: 3px 10px; border-radius: 999px;
    border: 1px solid var(--acc); background: var(--acc-soft); color: var(--acc);
    font: 600 12px/1.6 var(--sans);
}
.rel-body h3 { font-size: 17px; margin-bottom: 10px; }
.rel-sum { margin: 0 0 14px; color: var(--fg); font-weight: 560; }

/* --- 下载页 ------------------------------------------------------------ */
.dlbox { padding: 26px; border: 1px solid var(--line); border-radius: var(--r-l); background: var(--bg-soft); }
.dlbox-top { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 18px; }
.dlbox-name { font: 600 17px/1.4 var(--mono); word-break: break-all; }
.dlbox-sub { margin: 4px 0 0; color: var(--fg-mute); font-size: 14px; }
.kv { display: grid; grid-template-columns: 108px 1fr; gap: 8px 16px; margin: 22px 0 0; font-size: 14.5px; }
.kv dt { color: var(--fg-mute); }
.kv dd { margin: 0; }
.kv dd code {
    display: block; padding: 8px 12px; border: 1px solid var(--line); border-radius: 6px;
    background: var(--bg); font-size: 13px; word-break: break-all; overflow-wrap: anywhere;
}
.note-box {
    padding: 18px 22px; border: 1px solid var(--line); border-left: 3px solid var(--acc);
    border-radius: 0 var(--r-l) var(--r-l) 0; background: var(--acc-soft);
}
.note-box > :last-child { margin-bottom: 0; }
.step { padding: 28px 0; border-top: 1px solid var(--line-soft); }
.step h3 { display: flex; align-items: baseline; gap: 10px; font-size: 18px; margin-bottom: 8px; }
.step h3 .n { color: var(--acc); font: 700 14px/1 var(--mono); }
.step > p { color: var(--fg-dim); }

/* --- 文档库 ------------------------------------------------------------ */
.doc-layout { display: grid; grid-template-columns: 232px minmax(0, 1fr); gap: 52px; align-items: start; }
.doc-layout > article { min-width: 0; }
.doc-side { position: sticky; top: 86px; }
.doc-side h2 { margin-bottom: 12px; color: var(--fg-mute); font: 600 12px/1 var(--sans); letter-spacing: .1em; text-transform: uppercase; }
.doc-side ul { list-style: none; margin: 0 0 26px; padding: 0; border-left: 1px solid var(--line); }
.doc-side li { margin: 0; }
.doc-side a { display: block; padding: 7px 14px; margin-left: -1px; border-left: 2px solid transparent; color: var(--fg-dim); font-size: 14.5px; }
.doc-side a:hover { color: var(--fg); text-decoration: none; }
.doc-side a.on { border-left-color: var(--acc); color: var(--acc); font-weight: 600; }

.doc-title { font-size: clamp(25px, 4vw, 33px); letter-spacing: -.024em; }
.doc-meta { margin: 10px 0 30px; padding-bottom: 22px; border-bottom: 1px solid var(--line-soft); color: var(--fg-mute); font-size: 14px; }
.doc-nav { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 14px; margin-top: 52px; padding-top: 26px; border-top: 1px solid var(--line); }
.doc-nav a { padding: 14px 18px; border: 1px solid var(--line); border-radius: var(--r-l); color: inherit; }
.doc-nav a:hover { border-color: var(--acc); text-decoration: none; }
.doc-nav .lbl { display: block; color: var(--fg-mute); font-size: 12.5px; margin-bottom: 3px; }
.doc-nav .ttl { font-weight: 600; font-size: 15px; }
.doc-nav .next { text-align: right; }

/* --- 列表 / 搜索 ------------------------------------------------------- */
.list { display: grid; gap: 12px; }
.list-item {
    display: block; padding: 20px 22px; border: 1px solid var(--line);
    border-radius: var(--r-l); background: var(--bg); color: inherit;
}
.list-item:hover { border-color: var(--acc); text-decoration: none; background: var(--bg-soft); }
.list-item h3 { font-size: 16.5px; margin-bottom: 6px; }
.list-item p { margin: 0; color: var(--fg-mute); font-size: 14.5px; }
.list-item .meta { display: block; margin-top: 10px; color: var(--fg-mute); font: 500 12.5px/1 var(--mono); }
mark { background: var(--acc-soft); color: var(--acc); padding: 0 2px; border-radius: 3px; }

.pager { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 28px; }
.pager a {
    min-width: 36px; padding: 7px 10px; text-align: center;
    border: 1px solid var(--line); border-radius: var(--r);
    color: var(--fg-dim); font-size: 14px;
}
.pager a:hover { border-color: var(--acc); text-decoration: none; }
.pager a.active { background: var(--acc); border-color: var(--acc); color: var(--acc-fg); font-weight: 600; }

/* --- 表单 -------------------------------------------------------------- */
input[type=text], input[type=email], input:not([type]), textarea, select {
    width: 100%; padding: 10px 13px; border: 1px solid var(--line); border-radius: var(--r);
    background: var(--bg); color: var(--fg); font: inherit; font-size: 15px;
}
input::placeholder, textarea::placeholder { color: var(--fg-mute); }
textarea { resize: vertical; }
.search-box { display: flex; gap: 10px; }
.search-box button { flex: none; }
.contact-grid { display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 44px; align-items: start; }
.contact-form { display: grid; gap: 12px; }
.frow { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.captcha-row { display: flex; align-items: center; gap: 12px; }
.captcha-question { flex: none; color: var(--fg-dim); font: 600 15px/1 var(--mono); }
.ci { padding: 14px 0; border-bottom: 1px solid var(--line-soft); }
.ci strong { display: block; margin-bottom: 3px; color: var(--fg-mute); font-size: 13px; font-weight: 500; }

.flash { padding: 12px 18px; margin: 20px 0 0; border-radius: var(--r); border: 1px solid var(--line); background: var(--bg-soft); }
.flash-success { border-color: var(--acc); background: var(--acc-soft); }

/* --- 页脚 -------------------------------------------------------------- */
.ftr { margin-top: 88px; border-top: 1px solid var(--line); background: var(--bg-soft); }
.ftr-top { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 2fr); gap: 44px; padding-top: 52px; padding-bottom: 40px; }
.ftr-brand strong { display: inline-block; margin-left: 8px; vertical-align: 4px; }
.ftr-brand p { margin: 14px 0 0; font-size: 14px; max-width: 300px; }
.ftr-cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; }
.ftr-cols h2 { margin-bottom: 12px; color: var(--fg); font-size: 13px; font-weight: 640; }
.ftr-cols ul { list-style: none; margin: 0; padding: 0; }
.ftr-cols li { margin: 0; }
.ftr-cols a { display: block; padding: 4px 0; color: var(--fg-mute); font-size: 14.5px; }
.ftr-cols a:hover { color: var(--acc); text-decoration: none; }
.ftr-bot { display: flex; flex-wrap: wrap; gap: 6px 24px; justify-content: space-between; padding-top: 20px; padding-bottom: 34px; border-top: 1px solid var(--line); }
.ftr-bot p { margin: 0; font-size: 13.5px; color: var(--fg-dim); }
.tagv { padding: 2px 9px; border: 1px solid var(--line); border-radius: 999px; background: var(--bg); font: 600 12.5px/1.6 var(--mono); }

/* --- 响应式 ------------------------------------------------------------ */
@media (max-width: 1000px) {
    .doc-layout { grid-template-columns: 200px minmax(0, 1fr); gap: 34px; }
    .split { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
    .wrap, .container { padding: 0 18px; }
    .section { padding: 52px 0; }
    .hero { padding: 64px 0 52px; }
    .ftr-top { grid-template-columns: 1fr; gap: 34px; }

    /* 移动端导航：checkbox 控制展开，纯 CSS 无脚本。
       checkbox 只是视觉上藏起来，仍在 Tab 序里，空格键即可展开／收起。 */
    .nav-cb {
        display: block; position: absolute; width: 1px; height: 1px;
        margin: 0; opacity: 0; pointer-events: none;
    }
    .nav-cb:focus-visible ~ .nav-burger { outline: 2px solid var(--acc); outline-offset: 2px; }
    .nav-burger {
        display: flex; flex-direction: column; justify-content: center; gap: 5px;
        width: 40px; height: 40px; margin-left: auto; padding: 0 9px;
        border: 1px solid var(--line); border-radius: var(--r); cursor: pointer;
    }
    .nav-burger span { display: block; height: 2px; border-radius: 2px; background: var(--fg); transition: transform .18s, opacity .18s; }
    .nav-cb:checked ~ .nav-burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .nav-cb:checked ~ .nav-burger span:nth-child(2) { opacity: 0; }
    .nav-cb:checked ~ .nav-burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

    .nav {
        display: none; position: absolute; left: 0; right: 0; top: 62px;
        flex-direction: column; align-items: stretch; gap: 0;
        margin: 0; padding: 10px 18px 18px;
        background: var(--bg); border-bottom: 1px solid var(--line);
        box-shadow: 0 12px 28px rgb(0 0 0 / .1);
        max-height: calc(100vh - 62px); overflow-y: auto;
    }
    .nav-cb:checked ~ .nav { display: flex; }
    .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
    .nav-list > li > a { padding: 11px 12px; font-size: 16px; }
    /* 桌面版子菜单是悬浮层；移动端直接平铺，避免出现摸不到的 hover 菜单 */
    .sub {
        position: static; opacity: 1; visibility: visible; transform: none;
        min-width: 0; margin: 0 0 4px 12px; padding: 0 0 0 10px;
        border: 0; border-left: 1px solid var(--line); border-radius: 0; box-shadow: none; background: none;
    }
    .nav-side { justify-content: space-between; margin-top: 12px; padding-top: 14px; border-top: 1px solid var(--line-soft); }

    .doc-layout { grid-template-columns: 1fr; gap: 0; }
    .doc-side { position: static; margin-bottom: 34px; padding-bottom: 26px; border-bottom: 1px solid var(--line); }
    .doc-side ul { margin-bottom: 18px; }

    .rel { grid-template-columns: 1fr; gap: 14px; }
    .rel-meta { position: static; display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 12px; }
    .rel-date, .chip { margin-top: 0; }

    .contact-grid { grid-template-columns: 1fr; gap: 28px; }
    .kv { grid-template-columns: 1fr; gap: 4px 0; }
    .kv dt { margin-top: 12px; }
}

@media (max-width: 560px) {
    .frow { grid-template-columns: 1fr; }
    .doc-nav { grid-template-columns: 1fr; }
    .doc-nav .next { text-align: left; }
    .hero-cta .btn { flex: 1 1 100%; justify-content: center; }
    .ftr-cols { grid-template-columns: 1fr 1fr; }
    pre.code code { font-size: 12.8px; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}