/* ============================================================
   Codex 从入门到专精 · 多级页面样式
   在 base.css（单页版抽出的原样式）之上叠加：
   面包屑 / 章节卡 / 分页器 / 页面转场 / 按钮反馈 / 区块进入动画
   ============================================================ */

/* ---------- 1. 折叠面板：原生平滑展开（Chrome 131+ 生效，旧版直接跳变） ---------- */
html{interpolate-size:allow-keywords}
.acc::details-content{
  block-size:0;overflow:hidden;opacity:0;
  transition:block-size .32s cubic-bezier(.22,.7,.3,1),opacity .26s ease,content-visibility .32s;
  transition-behavior:allow-discrete;
}
.acc[open]::details-content{block-size:auto;opacity:1}

/* ---------- 2. 页面骨架 ---------- */
.page.wide .content{max-width:none}
/* 没有封面大图的内页（章节页 / 部分页 / 搜索页）：正文要让开固定顶栏，
   否则最上方的面包屑会被顶栏盖住、点不动 */
main > .page:first-child{padding-top:calc(64px + clamp(18px,2.6vw,30px))}

/* 顶栏动作区 */
.actions{display:flex;align-items:center;gap:8px;margin-left:auto}
.topnav a{position:relative}
.topnav a::after{
  content:"";position:absolute;left:12px;right:12px;bottom:4px;height:1.5px;border-radius:2px;
  background:linear-gradient(90deg,var(--brand),var(--brand-2));
  transform:scaleX(0);transform-origin:0 50%;transition:transform .26s cubic-bezier(.22,.7,.3,1);
}
.topnav a:hover::after,.topnav a[aria-current=page]::after{transform:scaleX(1)}
.topnav a[aria-current=page]{color:var(--fg)}

/* 面包屑 */
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:7px;font-size:13.5px;color:var(--fg-3);margin-bottom:var(--sp3)}
.crumbs a{color:var(--fg-2);transition:color .18s}
.crumbs a:hover{color:var(--brand);text-decoration:none}
.crumbs .sep{opacity:.45}
.crumbs .cur{color:var(--fg);font-weight:600}

/* 章节头 */
.doc-head{margin-bottom:var(--sp4);padding-bottom:var(--sp3);border-bottom:1px solid var(--border-soft)}
.doc-head .kicker{
  display:inline-flex;align-items:center;gap:9px;font-family:var(--mono);font-size:12px;font-weight:700;
  letter-spacing:.1em;color:var(--brand);margin-bottom:12px
}
.doc-head .kicker::before{content:"";width:22px;height:1px;background:var(--brand)}
.doc-head h1{
  font-size:clamp(1.7rem,3.1vw,2.5rem);letter-spacing:-.03em;line-height:1.22;margin-bottom:14px;
}
.doc-head .lead{font-size:clamp(1rem,1.3vw,1.1rem);color:var(--fg-2);margin:0;max-width:60ch}
.doc-head .meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px;font-size:12.5px;color:var(--fg-3)}
.doc-head .meta span{display:inline-flex;align-items:center;gap:6px}

/* ---------- 3. 章节卡片 / 部分卡片 / 快捷入口 ---------- */
.chap-card{
  display:flex;gap:16px;align-items:flex-start;padding:20px;border:1px solid var(--border);border-radius:var(--r);
  background:var(--surface);color:inherit;position:relative;overflow:hidden;
  transition:border-color .22s,translate .22s,box-shadow .28s;
}
.chap-card:hover{border-color:color-mix(in srgb,var(--brand) 45%,var(--border));translate:0 -3px;box-shadow:var(--glow);text-decoration:none}
.chap-card .n{
  flex:none;width:44px;height:44px;border-radius:13px;display:grid;place-items:center;
  font:800 15px/1 var(--mono);color:var(--brand);
  background:color-mix(in srgb,var(--brand) 14%,transparent);border:1px solid color-mix(in srgb,var(--brand) 30%,transparent);
  transition:transform .28s cubic-bezier(.22,.7,.3,1),background .22s
}
.chap-card:hover .n{transform:translateY(-2px) scale(1.05)}
.chap-card .tx{min-width:0}
.chap-card h3{margin:0 0 6px;font-size:1.03rem}
.chap-card p{margin:0;font-size:14.3px;color:var(--fg-2);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.chap-card .go{margin-left:auto;color:var(--fg-3);flex:none;align-self:center;transition:transform .22s,color .22s}
.chap-card:hover .go{color:var(--brand);transform:translateX(3px)}

.pcard{
  display:block;padding:24px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--surface);
  color:inherit;position:relative;overflow:hidden;transition:border-color .22s,translate .22s,box-shadow .28s;
}
.pcard:hover{border-color:color-mix(in srgb,var(--brand) 45%,var(--border));translate:0 -4px;box-shadow:var(--glow);text-decoration:none}
.pcard .pnum{font:700 12px/1 var(--mono);letter-spacing:.12em;color:var(--brand);margin-bottom:12px;display:block}
.pcard h3{margin:0 0 10px;font-size:1.18rem;letter-spacing:-.02em}
.pcard p{margin:0 0 14px;font-size:14.4px;color:var(--fg-2)}
.pcard .chips{display:flex;flex-wrap:wrap;gap:6px}
.pcard .chip{pointer-events:none;font-size:12px;padding:4px 10px;min-height:0}

.quick{
  display:flex;align-items:center;gap:14px;padding:18px 20px;border:1px solid var(--border);border-radius:var(--r);
  background:var(--surface);color:inherit;transition:border-color .22s,translate .22s,box-shadow .28s
}
.quick:hover{border-color:color-mix(in srgb,var(--brand) 45%,var(--border));translate:0 -3px;box-shadow:var(--glow);text-decoration:none}
.quick .qi{width:40px;height:40px;flex:none;border-radius:12px;display:grid;place-items:center;background:var(--surface-3);color:var(--brand);font-size:19px}
.quick b{display:block;font-size:15px;margin-bottom:3px}
.quick span{font-size:13.5px;color:var(--fg-2)}

/* ---------- 4. 上下页 ---------- */
.pager{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:var(--sp5)}
.pager a{
  display:flex;flex-direction:column;gap:7px;padding:20px;border:1px solid var(--border);border-radius:var(--r);
  background:var(--surface);color:inherit;position:relative;overflow:hidden;
  transition:border-color .22s,translate .22s,box-shadow .28s
}
.pager a:hover{border-color:color-mix(in srgb,var(--brand) 50%,var(--border));translate:0 -3px;box-shadow:var(--glow);text-decoration:none}
.pager a small{font-size:12.5px;color:var(--fg-3);display:flex;align-items:center;gap:7px;font-weight:600}
.pager a b{font-size:15.4px;letter-spacing:-.01em}
.pager a.nx{align-items:flex-end;text-align:right}
.pager a .ic{transition:transform .24s cubic-bezier(.22,.7,.3,1)}
.pager a.pv:hover .ic{transform:translateX(-4px)}
.pager a.nx:hover .ic{transform:translateX(4px)}
.pager .empty{border-style:dashed;opacity:.65}

/* 键盘提示 */
.keyhint{display:flex;justify-content:center;gap:8px;margin-top:16px;font-size:12.5px;color:var(--fg-3);flex-wrap:wrap}

/* ---------- 5. 页面转场 ---------- */
@keyframes pageIn{from{opacity:0;transform:translate3d(0,12px,0)}to{opacity:1;transform:none}}
@keyframes blockIn{from{opacity:0;transform:translate3d(0,10px,0)}to{opacity:1;transform:none}}
html.js-anim .hero-in>*{animation:blockIn .5s cubic-bezier(.22,.7,.3,1) both}
html.js-anim .hero-in>*:nth-child(2){animation-delay:.08s}
html.js-anim .page{animation:pageIn .45s cubic-bezier(.22,.7,.3,1) both}
body.leaving .page,body.leaving .hero,body.leaving .foot{
  opacity:0;transform:translate3d(0,-8px,0);
  transition:opacity .17s ease,transform .17s ease;
}
/* 区块进入（JS 自动给内容块打标，无 JS 时始终保持可见） */
.fx{opacity:1}
html.js-anim .fx{opacity:0;transform:translate3d(0,14px,0);
  transition:opacity .5s cubic-bezier(.22,.7,.3,1),transform .5s cubic-bezier(.22,.7,.3,1);
  transition-delay:var(--d,0ms)}
html.js-anim .fx.in{opacity:1;transform:none}

/* ---------- 6. 交互反馈 ---------- */
.btn,.chip,.iconbtn,.copy,.chap-card,.pcard,.quick,.pager a{position:relative}
.btn,.chip,.copy,.iconbtn{overflow:hidden}
.btn{transform:translateZ(0)}
.btn:active{scale:.97}
.chip:active,.iconbtn:active,.copy:active{scale:.95}
.btn,.chip,.iconbtn,.copy{transition:translate .18s,scale .12s,box-shadow .22s,background .2s,border-color .2s,color .2s}
.btn-p:hover{box-shadow:0 20px 40px -18px rgba(49,217,168,.95)}
.btn-s:hover{box-shadow:0 18px 34px -22px rgba(0,0,0,.6)}
.ripple{
  position:absolute;border-radius:50%;pointer-events:none;background:currentColor;opacity:.35;
  transform:scale(0);animation:rip .6s cubic-bezier(.22,.7,.3,1) forwards
}
@keyframes rip{to{transform:scale(2.8);opacity:0}}

/* 卡片跟随光斑 */
.card::after,.chap-card::after,.pcard::after,.quick::after,.pager a::after{
  content:"";position:absolute;inset:0;border-radius:inherit;opacity:0;pointer-events:none;transition:opacity .3s;
  background:radial-gradient(300px circle at var(--mx,50%) var(--my,50%),color-mix(in srgb,var(--brand) 13%,transparent),transparent 65%)
}
.card:hover::after,.chap-card:hover::after,.pcard:hover::after,.quick:hover::after,.pager a:hover::after{opacity:1}
.card,.chap-card,.pcard,.quick,.pager a{isolation:isolate}
.card>*,.chap-card>*,.pcard>*,.quick>*,.pager a>*{position:relative;z-index:1}

/* 侧栏当前项就位 */
.sidebar a.on{position:relative}
.sidebar a.on::before{
  content:"";position:absolute;left:0;top:50%;width:2px;height:58%;translate:0 -50%;border-radius:2px;
  background:linear-gradient(180deg,var(--brand),var(--brand-2))
}

/* 侧栏分组标题本身就是链接（可点进部分页） */
.sb-group>p>a{
  display:inline;padding:0;font-size:inherit;font-weight:700;letter-spacing:.08em;
  color:var(--brand);background:none;border:0;border-radius:0
}
.sb-group>p>a:hover{color:var(--brand-2);text-decoration:none}
.sb-group>p>a:hover::before{display:none}

/* 正文里的章节交叉引用 */
.xref{
  color:var(--brand-2);border-bottom:1px dashed color-mix(in srgb,var(--brand-2) 55%,transparent);
  transition:color .18s,border-color .18s,background .18s;padding:0 .1em;border-radius:4px
}
.xref:hover{color:var(--brand);border-bottom-color:var(--brand);background:color-mix(in srgb,var(--brand) 12%,transparent);text-decoration:none}

/* 搜索结果 */
#qOut .chap-card h3{font-size:.99rem}
#qOut .chap-card .n{font-size:12.5px}
.sr-empty{grid-column:1/-1;padding:28px;text-align:center;color:var(--fg-3);border:1px dashed var(--border);border-radius:var(--r)}

/* 标题渐显下划线 */
.doc-head h1{background:linear-gradient(100deg,var(--fg) 40%,var(--fg-2));-webkit-background-clip:text;background-clip:text;color:transparent}

/* 阅读进度环（右上角小按钮复用 iconbtn） */
.totop{scale:.9;transition:opacity .25s,translate .25s,scale .25s}
.totop.on{scale:1}

/* ---------- 7. 响应式 ---------- */
@media (max-width:1080px){
  .actions .hide-sm{display:none}
  .topnav{display:none}
}
@media (max-width:720px){
  .pager{grid-template-columns:1fr}
  .pager a.nx{align-items:flex-start;text-align:left}
  .chap-card{padding:16px;gap:12px}
  .chap-card .n{width:38px;height:38px;border-radius:11px;font-size:13.5px}
  .pcard{padding:20px}
  .doc-head h1{font-size:1.6rem}
}
@media (prefers-reduced-motion:reduce){
  html.js-anim .hero-in>*,html.js-anim .page{animation:none}
  html.js-anim .fx{opacity:1;transform:none;transition:none}
  body.leaving .page,body.leaving .hero,body.leaving .foot{opacity:1;transform:none}
  .ripple{display:none}
  .acc::details-content{transition:none}
}
@media print{
  .crumbs,.pager,.keyhint,.sidebar,.topbar,.totop,.progress{display:none!important}
  .page{display:block;padding:0}
}

/* ============================================================
   8. 动画演示（.demo）
   设计原则：静态时的样子就是"看得懂的完整状态"，动画只做强调与串联。
   所以关掉 JS、开启「减少动效」、甚至打印出来，信息都不丢。
   ============================================================ */
.demo{
  margin:var(--sp4) 0;border:1px solid var(--border);border-radius:var(--r-lg);
  background:var(--surface);overflow:hidden;position:relative
}
.demo-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:13px 18px;background:var(--surface-2);border-bottom:1px solid var(--border-soft)}
.demo-tag{
  font:700 11.5px/1 var(--mono);letter-spacing:.09em;color:var(--brand);padding:5px 9px;border-radius:999px;
  background:color-mix(in srgb,var(--brand) 14%,transparent);border:1px solid color-mix(in srgb,var(--brand) 32%,transparent)
}
.demo-head b{font-size:15px}
.demo-head .demo-note{margin-left:auto;font-size:12.5px;color:var(--fg-3)}
.demo-stage{position:relative;padding:24px 18px;display:grid;place-items:center;overflow:hidden}
.demo figcaption{padding:2px 18px 0;font-size:14.2px;color:var(--fg-2)}
.demo figcaption b{color:var(--fg)}
.demo-replay{
  margin:12px 18px 0;display:inline-flex;align-items:center;gap:7px;font:600 12.5px/1 var(--sans);
  background:var(--surface-2);border:1px solid var(--border);color:var(--fg-2);padding:8px 12px;border-radius:9px;
  cursor:pointer;transition:color .18s,border-color .18s,scale .12s
}
.demo-replay:hover{color:var(--brand);border-color:var(--brand)}
.demo-replay:active{scale:.96}
/* 只在可见时播放，离开视口暂停以省电；减少动效时完全不播放 */
.demo .demo-stage *{animation-play-state:paused}
.demo.on .demo-stage *{animation-play-state:running}
.demo .demo-reset *{animation:none!important}
@media (prefers-reduced-motion:reduce){.demo .demo-stage *{animation:none!important}}

/* --- 演示 1：Agent 五步流水线 --- */
.dm-flow{display:flex;align-items:center;gap:0;flex-wrap:wrap;justify-content:center}
.dm-step{display:flex;flex-direction:column;align-items:center;gap:8px;width:112px;text-align:center}
.dm-step i{
  width:46px;height:46px;border-radius:14px;display:grid;place-items:center;font-size:21px;
  background:var(--surface-3);border:1px solid var(--border);color:var(--brand)
}
.dm-step span{font-size:12.6px;color:var(--fg-2);line-height:1.4}
.dm-rail{width:26px;height:2px;background:var(--border);flex:none;margin-bottom:26px;position:relative;overflow:hidden}
.dm-rail::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent,var(--brand),transparent);transform:translateX(-100%);animation:dmRail 4.6s linear infinite}
.dm-step:nth-child(1) i{animation:dmGlow 4.6s ease-in-out infinite;animation-delay:0s}
.dm-step:nth-child(3) i{animation:dmGlow 4.6s ease-in-out infinite;animation-delay:.9s}
.dm-step:nth-child(5) i{animation:dmGlow 4.6s ease-in-out infinite;animation-delay:1.8s}
.dm-step:nth-child(7) i{animation:dmGlow 4.6s ease-in-out infinite;animation-delay:2.7s}
.dm-step:nth-child(9) i{animation:dmGlow 4.6s ease-in-out infinite;animation-delay:3.6s}
.dm-rail:nth-child(2)::after{animation-delay:.9s}
.dm-rail:nth-child(4)::after{animation-delay:1.8s}
.dm-rail:nth-child(6)::after{animation-delay:2.7s}
.dm-rail:nth-child(8)::after{animation-delay:3.6s}
@keyframes dmRail{0%{transform:translateX(-100%)}12%{transform:translateX(100%)}100%{transform:translateX(100%)}}
@keyframes dmGlow{
  0%,100%{background:var(--surface-3);border-color:var(--border);box-shadow:none;transform:none}
  6%{background:color-mix(in srgb,var(--brand) 20%,var(--surface-3));border-color:var(--brand);box-shadow:0 10px 24px -14px var(--brand);transform:translateY(-3px)}
  16%{background:var(--surface-3);border-color:var(--border);box-shadow:none;transform:none}
}

/* --- 演示 2：上下文窗口被挤满 --- */
.dm-window{width:100%;max-width:620px;display:grid;gap:12px}
.dm-window .dm-bar{display:flex;gap:6px;padding:12px;border:2px solid var(--border);border-radius:14px;background:var(--bg-2)}
.dm-seg{flex:1;height:38px;border-radius:8px;background:var(--surface-3);border:1px solid var(--border);position:relative;display:grid;place-items:center;font:600 11px/1 var(--mono);color:var(--fg-3)}
.dm-seg::after{content:"×";position:absolute;inset:0;display:grid;place-items:center;font-size:19px;color:var(--danger);opacity:0}
.dm-seg.kill::after{animation:dmKill 6s ease-in-out infinite}
.dm-seg.kill{border-color:color-mix(in srgb,var(--danger) 40%,var(--border))}
@keyframes dmKill{0%,100%{opacity:.25}8%{opacity:1}22%{opacity:.25}}
.dm-window .dm-label{display:flex;justify-content:space-between;font-size:12.5px;color:var(--fg-3)}
.dm-window .dm-new{
  justify-self:end;display:inline-flex;align-items:center;gap:7px;font:600 12.5px/1 var(--sans);
  color:var(--brand);background:color-mix(in srgb,var(--brand) 12%,transparent);border:1px solid color-mix(in srgb,var(--brand) 34%,transparent);
  padding:7px 11px;border-radius:999px;animation:dmNew 6s ease-in-out infinite
}
@keyframes dmNew{0%,100%{transform:translateX(6px);opacity:.55}10%{transform:translateX(0);opacity:1}30%{transform:translateX(0);opacity:.55}}
.dm-seg:nth-child(odd){animation:dmNone 1s}

/* --- 演示 3：沙盒边界与审批 --- */
.dm-sandbox{width:100%;max-width:660px;display:grid;gap:14px;position:relative}
.dm-zone{border:2px dashed color-mix(in srgb,var(--brand) 55%,transparent);border-radius:16px;padding:14px 14px 16px;background:color-mix(in srgb,var(--brand) 7%,transparent)}
.dm-zone-label{display:block;font:700 12px/1 var(--mono);color:var(--brand);letter-spacing:.08em;margin-bottom:10px}
.dm-files{display:flex;gap:8px;flex-wrap:wrap}
.dm-file{display:inline-flex;align-items:center;gap:6px;font-size:12.8px;padding:7px 11px;border-radius:9px;background:var(--surface);border:1px solid var(--border);color:var(--fg-2)}
.dm-file.risk{border-color:color-mix(in srgb,var(--danger) 40%,var(--border));color:var(--fg-3);border-style:dashed}
.dm-outside{border:2px dashed color-mix(in srgb,var(--danger) 40%,transparent);border-radius:16px;padding:12px 14px}
.dm-outside .dm-zone-label{color:var(--danger)}
.dm-ask{
  justify-self:center;max-width:420px;text-align:center;font-size:13.2px;color:var(--fg);
  padding:12px 16px;border-radius:14px;background:var(--surface-2);border:1px solid var(--brand);
  box-shadow:0 18px 40px -26px var(--brand);animation:dmAsk 6s ease-in-out infinite
}
.dm-ask b{display:block;margin-top:6px;color:var(--brand);font-family:var(--mono);font-size:12.5px}
@keyframes dmAsk{0%,42%{transform:scale(.94) translateY(6px);opacity:.35}50%{transform:scale(1) translateY(0);opacity:1}90%{transform:scale(1) translateY(0);opacity:1}100%{transform:scale(.94) translateY(6px);opacity:.35}}
@keyframes dmNone{from{opacity:1}to{opacity:1}}

/* --- 演示 4：提示词五件套 --- */
.dm-five{width:100%;max-width:640px;display:grid;gap:8px}
.dm-row{
  display:grid;grid-template-columns:104px 1fr;gap:12px;align-items:center;font-size:13.4px;
  padding:11px 14px;border-radius:12px;background:var(--surface-2);border:1px solid var(--border);color:var(--fg-2)
}
.dm-row b{font:700 12.5px/1 var(--mono);color:var(--brand);letter-spacing:.04em}
.dm-row:nth-child(1){animation:dmRow 5s ease-out infinite;animation-delay:0s}
.dm-row:nth-child(2){animation:dmRow 5s ease-out infinite;animation-delay:.5s}
.dm-row:nth-child(3){animation:dmRow 5s ease-out infinite;animation-delay:1s}
.dm-row:nth-child(4){animation:dmRow 5s ease-out infinite;animation-delay:1.5s}
.dm-row:nth-child(5){animation:dmRow 5s ease-out infinite;animation-delay:2s}
@keyframes dmRow{
  0%{transform:translateX(0);border-color:var(--border)}
  8%{transform:translateX(8px);border-color:var(--brand);background:color-mix(in srgb,var(--brand) 10%,var(--surface-2))}
  22%,100%{transform:translateX(0);border-color:var(--border);background:var(--surface-2)}
}

/* --- 演示 5：Token 切词 --- */
.dm-token{width:100%;max-width:640px;display:grid;gap:14px;justify-items:center}
.dm-token .dm-sent{font-family:var(--mono);font-size:15px;color:var(--fg-2);text-align:center;line-height:2}
.dm-tk{display:inline-block;padding:2px 6px;border-radius:6px;border:1px solid transparent;animation:dmTk 6s ease-in-out infinite}
.dm-tk:nth-child(1){animation-delay:0s}.dm-tk:nth-child(2){animation-delay:.35s}.dm-tk:nth-child(3){animation-delay:.7s}
.dm-tk:nth-child(4){animation-delay:1.05s}.dm-tk:nth-child(5){animation-delay:1.4s}.dm-tk:nth-child(6){animation-delay:1.75s}
.dm-tk:nth-child(7){animation-delay:2.1s}.dm-tk:nth-child(8){animation-delay:2.45s}
@keyframes dmTk{
  0%,100%{background:transparent;border-color:transparent;color:var(--fg-2)}
  6%{background:color-mix(in srgb,var(--brand) 18%,transparent);border-color:color-mix(in srgb,var(--brand) 40%,transparent);color:var(--fg)}
  18%{background:transparent;border-color:transparent;color:var(--fg-2)}
}
.dm-token .dm-count{display:flex;gap:6px;flex-wrap:wrap;justify-content:center}
.dm-tkbox{font:600 11.5px/1 var(--mono);color:var(--fg-3);border:1px dashed var(--border);border-radius:7px;padding:6px 8px}

/* --- 演示 6：CC Switch 切换流程 --- */
.dm-switch{width:100%;max-width:660px;display:grid;grid-template-columns:repeat(3,1fr);gap:12px;align-items:start}
.dm-col{border:1px solid var(--border);border-radius:14px;background:var(--surface-2);padding:14px;text-align:center}
.dm-col b{display:block;font-size:13.6px;margin-bottom:6px}
.dm-col span{font-size:12.4px;color:var(--fg-3);font-family:var(--mono)}
.dm-col.net{border-color:var(--brand);box-shadow:0 0 0 1px color-mix(in srgb,var(--brand) 30%,transparent),0 18px 40px -30px var(--brand);animation:dmCol 5.4s ease-in-out infinite}
.dm-col.file{animation:dmCol 5.4s ease-in-out infinite;animation-delay:1s}
.dm-col.restart{animation:dmCol 5.4s ease-in-out infinite;animation-delay:2s}
@keyframes dmCol{0%,100%{border-color:var(--border);box-shadow:none}10%{border-color:var(--brand);box-shadow:0 0 0 1px color-mix(in srgb,var(--brand) 30%,transparent)}30%{border-color:var(--border);box-shadow:none}}
.dm-switch .dm-arrowline{grid-column:1/-1;height:2px;background:linear-gradient(90deg,transparent,var(--brand),transparent);transform-origin:0 50%;animation:dmLine 5.4s linear infinite}
@keyframes dmLine{0%{transform:scaleX(0);opacity:0}12%{transform:scaleX(1);opacity:1}45%{transform:scaleX(1);opacity:1}60%,100%{transform:scaleX(1);opacity:0}}

/* ============================================================
   9. 思维导图（.mindmap）
   纯 CSS 树：横向生长，窄屏可横向滚动；没有画布、没有图片。
   ============================================================ */
.mindmap{
  margin:var(--sp4) 0;padding:20px 18px 22px;border:1px solid var(--border);border-radius:var(--r-lg);
  background:var(--surface);overflow-x:auto
}
.mindmap .mm-title{font:700 12px/1 var(--mono);letter-spacing:.1em;color:var(--brand);margin-bottom:16px}
.mm{min-width:max-content}
.mm ul{list-style:none;margin:0;padding:0 0 0 24px;position:relative}
.mm li{position:relative;padding:5px 0}
.mm li::before{content:"";position:absolute;left:-24px;top:50%;width:22px;height:2px;background:var(--border)}
.mm li::after{content:"";position:absolute;left:-24px;top:0;bottom:0;border-left:2px solid var(--border)}
.mm li:first-child::after{top:50%}
.mm li:last-child::after{bottom:50%}
.mm>ul{padding-left:0}
.mm>ul>li::before,.mm>ul>li::after{display:none}
/* 叶子层：横向成簇，用一条左侧括号线兜住，像导图的"分枝"而不是竖排清单 */
.mm ul ul ul{
  display:flex;flex-wrap:wrap;gap:6px 8px;align-items:center;
  padding-left:14px;border-left:2px solid var(--border);margin:2px 0 6px
}
.mm ul ul ul>li{padding:2px 0}
.mm ul ul ul>li::before,.mm ul ul ul>li::after{display:none}
.mm-node{
  display:inline-flex;align-items:center;gap:8px;padding:8px 13px;border-radius:11px;font-size:14px;font-weight:600;
  background:var(--surface-2);border:1px solid var(--border);color:var(--fg)
}
.mm-node .ic{color:var(--brand);font-size:16px}
.mm-root-node{background:linear-gradient(120deg,var(--brand),var(--brand-2));color:#04140E;border-color:transparent;font-weight:800}
.mm-root-node .ic{color:#04140E}
.mm-branch{background:color-mix(in srgb,var(--brand) 10%,var(--surface-2));border-color:color-mix(in srgb,var(--brand) 32%,var(--border));color:var(--fg)}
.mm-leaf{
  display:inline-block;padding:5px 10px;border-radius:8px;font-size:13.2px;color:var(--fg-2);
  background:var(--bg-2);border:1px dashed var(--border)
}
.mm-leaf.hot{border-style:solid;border-color:color-mix(in srgb,var(--brand) 40%,var(--border));color:var(--fg)}
/* 分组卡片式地图（用于全站地图） */
.mm-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(238px,1fr));gap:14px}
.mm-card{border:1px solid var(--border);border-radius:var(--r);background:var(--surface);padding:16px;position:relative;overflow:hidden}
.mm-card::before{content:"";position:absolute;inset:0 auto 0 0;width:3px;background:linear-gradient(180deg,var(--brand),var(--brand-2))}
.mm-card h4{margin:0 0 4px;font-size:15px;display:flex;align-items:center;gap:8px}
.mm-card h4 .ic{color:var(--brand)}
.mm-card .mm-sub{font-size:12.4px;color:var(--fg-3);margin-bottom:10px}
.mm-card .mm-links{display:flex;flex-wrap:wrap;gap:6px}
.mm-card .mm-links a{
  font-size:12.6px;padding:5px 9px;border-radius:8px;background:var(--bg-2);border:1px solid var(--border);
  color:var(--fg-2);transition:color .18s,border-color .18s,translate .18s
}
.mm-card .mm-links a:hover{color:var(--brand);border-color:var(--brand);translate:0 -2px;text-decoration:none}
@media (max-width:720px){
  .dm-flow .dm-rail{display:none}
  .dm-step{width:88px}
  .dm-switch{grid-template-columns:1fr}
  .dm-row{grid-template-columns:88px 1fr}
  .mm-node{font-size:13.2px;padding:7px 11px}
}
/* 关键词链接组（视频教程页用） */
.taglinks{display:flex;flex-wrap:wrap;gap:8px;margin:var(--sp3) 0}
.taglinks a{
  display:inline-flex;align-items:center;gap:6px;font-size:13.4px;padding:9px 13px;border-radius:999px;
  background:var(--surface-2);border:1px solid var(--border);color:var(--fg-2);
  transition:color .18s,border-color .18s,translate .18s,background .18s
}
.taglinks a:hover{color:var(--brand);border-color:var(--brand);translate:0 -2px;text-decoration:none;background:var(--surface)}
.taglinks a::after{content:"↗";font-size:12px;opacity:.65}
.taglinks a small{color:var(--fg-3);font-size:12px}
@media print{
  .demo,.mindmap{border-color:#ccc}
  .demo{break-inside:avoid}
}