/* ============================================================
   小花猫英语 · 官网
   视觉基线取自 App：墨绿 #2A6E62 / 奶白 / 暖棕，圆角 + 轻阴影
   ============================================================ */

:root{
  --brand:#2A6E62;
  --brand-deep:#245C52;
  --brand-soft:#E4F0ED;
  --brand-mist:#F1F7F5;
  --ink:#23201C;
  --ink2:#6B6459;
  --ink3:#8C8577;
  --line:#E7E0D4;
  --cream:#FBF9F4;
  --warm:#F7EBD8;
  --gold:#C08A2E;

  --watch:#FF8A4C;
  --practice:#4E9BE8;
  --listen:#8E7BE0;
  --lesson:#F2B23E;
  --chat:#7FD1C1;

  --r-s:10px;
  --r-m:16px;
  --r-l:24px;
  --r-xl:32px;
  --shadow:0 8px 28px rgba(80,60,30,.07);
  --shadow-lg:0 20px 60px rgba(42,110,98,.13);
  --max:1160px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--cream);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",sans-serif;
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3{letter-spacing:-.02em;line-height:1.25;margin:0}
p{margin:0}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:999px;font-weight:600;cursor:pointer;border:1px solid transparent;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease;
  white-space:nowrap;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-sm{padding:9px 18px;font-size:14px}
.btn-lg{padding:14px 26px;font-size:16px}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 6px 18px rgba(42,110,98,.22)}
.btn-primary:hover{background:var(--brand-deep);box-shadow:0 10px 24px rgba(42,110,98,.28)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.btn-white{background:#fff;color:var(--brand-deep)}
.btn-white:hover{background:#F4FBF9}
.btn-line{background:transparent;color:#fff;border-color:rgba(255,255,255,.42)}
.btn-line:hover{border-color:#fff;background:rgba(255,255,255,.08)}

/* ---------- 小标签 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:600;color:var(--brand);
  background:var(--brand-soft);border-radius:999px;padding:6px 14px;
  margin-bottom:20px;letter-spacing:0;
}
.eyebrow .dot{width:6px;height:6px;border-radius:50%;background:var(--brand);display:block}
.eyebrow.light{background:rgba(255,255,255,.14);color:#DCEFEA}

/* ---------- 导航 ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(251,249,244,.82);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid transparent;
  transition:border-color .2s ease,box-shadow .2s ease;
}
.nav.scrolled{border-bottom-color:var(--line);box-shadow:0 4px 18px rgba(80,60,30,.05)}
.nav-in{display:flex;align-items:center;gap:32px;height:70px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;letter-spacing:-.02em}
.brand img{width:34px;height:34px;border-radius:9px}
.nav-links{display:flex;gap:28px;margin-left:auto;font-size:15px;color:var(--ink2)}
.nav-links a{transition:color .15s}
.nav-links a:hover{color:var(--brand)}
.nav-burger{display:none;background:none;border:0;padding:8px;cursor:pointer}
.nav-burger span{display:block;width:22px;height:2px;background:var(--ink);border-radius:2px;margin:5px 0}

/* ---------- 首屏 ---------- */
.hero{position:relative;overflow:hidden;padding:64px 0 40px}
.hero::before{
  content:"";position:absolute;width:900px;height:900px;right:-320px;top:-380px;
  background:radial-gradient(circle,rgba(42,110,98,.10),rgba(42,110,98,0) 62%);
  pointer-events:none;
}
.hero::after{
  content:"";position:absolute;width:560px;height:560px;left:-260px;bottom:-300px;
  background:radial-gradient(circle,rgba(242,178,62,.10),rgba(242,178,62,0) 65%);
  pointer-events:none;
}
.hero-in{position:relative;display:grid;grid-template-columns:1.04fr .96fr;gap:40px;align-items:center}
.hero-copy{padding-bottom:24px}
.hero h1{font-size:clamp(30px,3.35vw,46px);font-weight:800;letter-spacing:-.035em;line-height:1.34}
.hero h1 em{
  font-style:normal;color:var(--brand);white-space:nowrap;padding:0 2px;
  background-image:linear-gradient(180deg,transparent 66%,rgba(127,209,193,.5) 66%,rgba(127,209,193,.5) 94%,transparent 94%);
}
.lead{margin-top:22px;font-size:17px;color:var(--ink2);max-width:34em;line-height:1.85}
.hero-cta{display:flex;gap:12px;margin-top:32px;flex-wrap:wrap}
.hero-note{margin-top:16px;font-size:13.5px;color:var(--ink3)}

/* 手机：真机截图装进设备框（截图已裁掉系统状态栏与导航条） */
.hero-visual{position:relative;display:flex;justify-content:center;padding:16px 0 40px}
.phone{
  width:318px;background:#fff;border:1px solid var(--line);
  border-radius:46px;padding:9px;box-shadow:var(--shadow-lg);
  position:relative;z-index:2;
}
.screen{border-radius:37px;overflow:hidden;background:#fff;border:1px solid #F0EBE1;line-height:0}
.shot{display:block;width:100%;height:auto}

/* 浮卡 */
.float-card{
  position:absolute;background:#fff;border:1px solid var(--line);
  border-radius:18px;box-shadow:var(--shadow);z-index:3;padding:12px 14px;
}
.fc-2{right:26px;bottom:86px;padding:12px 14px;animation:float 7s ease-in-out infinite .8s}
.fc-line{display:flex;align-items:center;gap:7px;font-size:11px;padding:3px 0;color:var(--ink2)}
.fc-line i{width:7px;height:7px;border-radius:2px;display:block}
.fc-line .d1{background:var(--watch)}.fc-line .d2{background:var(--practice)}
.fc-line .d3{background:var(--listen)}.fc-line .d4{background:var(--chat)}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}

/* ---------- 数字条 ---------- */
.stats{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:#FFFDF8}
.stats-in{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;padding:30px 24px}
.stats-in>div{text-align:center}
.stats-in b{display:block;font-size:34px;font-weight:800;color:var(--brand);letter-spacing:-.03em;line-height:1.1}
.stats-in span{font-size:13px;color:var(--ink3)}

/* ---------- 通用段落 ---------- */
.sec{padding:96px 0}
.sec-warm{background:#FFFDF8;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{max-width:640px;margin-bottom:52px}
.sec-head h2{font-size:clamp(26px,3.2vw,40px);font-weight:800}
.sec-head p{margin-top:16px;color:var(--ink2);font-size:16.5px}
.sec-head.light h2{color:#fff}
.sec-head.light p{color:#CFE3DE}

/* ---------- 四步 ---------- */
.steps4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.s4{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-l);
  padding:26px 22px 24px;transition:transform .2s ease,box-shadow .2s ease;
}
.s4:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.s4-ico{
  width:46px;height:46px;border-radius:14px;display:grid;place-items:center;margin-bottom:18px;
}
.s4-ico svg{width:22px;height:22px}
.c-watch{background:#FFEFE6;color:#D96A2E}
.c-practice{background:#E9F2FD;color:#2F72B8}
.c-listen{background:#EFECFC;color:#6A57C4}
.c-talk{background:#E4F6F2;color:#2A6E62}
.c-lesson{background:#FEF4DF;color:#A97A18}
.s4 h3{font-size:19px;font-weight:800;margin-bottom:10px}
.s4 h3 span{font-size:13px;font-weight:600;color:var(--ink3);margin-left:2px}
.s4 p{font-size:14px;color:var(--ink2);line-height:1.8}

/* ---------- 课程体系 ---------- */
.path-in{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.path-copy p{margin-top:18px;color:var(--ink2);font-size:15.5px;line-height:1.9}
.ticks{list-style:none;padding:0;margin:26px 0 0}
.ticks li{position:relative;padding-left:26px;margin-bottom:12px;font-size:14.5px;color:var(--ink2)}
.ticks li::before{
  content:"";position:absolute;left:0;top:6px;width:14px;height:14px;border-radius:50%;
  background:var(--brand-soft);
  box-shadow:inset 0 0 0 4px var(--brand-soft);
  border:1px solid var(--brand);
}
.ticks b{color:var(--ink)}
.stairs{background:#fff;border:1px solid var(--line);border-radius:var(--r-xl);padding:30px 26px;box-shadow:var(--shadow)}
.stair-row{display:flex;align-items:center;gap:12px;margin-bottom:10px}
.stair-no{width:18px;font-size:12px;font-weight:700;color:var(--ink3);text-align:center}
.stair-bar{
  width:var(--w);display:flex;align-items:center;justify-content:space-between;
  border-radius:12px;padding:11px 14px;color:#fff;
}
.stair-bar b{font-size:14px;font-weight:700}
.stair-bar i{font-size:11px;opacity:.8;font-style:normal}
.b5{background:#1F5148}.b4{background:#276158}.b3{background:var(--brand)}
.b2{background:#3C8879}.b1{background:#59A395}
.stairs-note{margin-top:16px;font-size:12.5px;color:var(--ink3);text-align:center}

/* ---------- 双端界面 ---------- */
.duo{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.duo-card{
  border-radius:var(--r-xl);padding:32px 28px 28px;border:1px solid var(--line);
  background:#fff;position:relative;overflow:hidden;
}
.duo-card.kid{background:linear-gradient(170deg,#F0FAF7 0%,#FBFDFC 58%)}
.duo-card.parent{background:linear-gradient(170deg,#F7F5EF 0%,#FDFCFA 58%)}
.duo-tag{
  display:inline-block;font-size:12px;font-weight:700;letter-spacing:.02em;
  padding:5px 12px;border-radius:99px;background:#fff;border:1px solid var(--line);color:var(--ink2);
}
.duo-shot{display:flex;justify-content:center;align-items:center;min-height:536px;margin:26px 0 24px}
/* 机身尺寸写死（264 宽 → 262 内容宽，高 = 262 ÷ 图宽高比），
   图片用 height:100% + object-fit:cover：Safari 会在 flex 里把 height:auto
   的图片按容器高度撑开，这里不给它「自动」的机会 */
.mini-phone{
  flex:0 0 auto;align-self:center;width:264px;height:533px;
  background:#fff;border:1px solid #EDE7DB;border-radius:28px;
  box-shadow:0 10px 30px rgba(80,60,30,.07);overflow:hidden;line-height:0;
}
.duo-card.kid .mini-phone{height:398px}
.mini-phone .shot{width:100%;height:100%;object-fit:cover;object-position:center top}

/* 「我的」「消息」两张小截图 */
.shot-strip{
  margin-top:24px;border:1px solid var(--line);border-radius:var(--r-xl);
  background:#FCFBF7;padding:26px 34px;
  display:flex;align-items:center;justify-content:space-between;gap:40px;
}
.ss-copy{max-width:440px}
.ss-copy b{display:block;font-size:18px;font-weight:800;letter-spacing:-.01em;margin-bottom:9px}
.ss-copy span{font-size:14.5px;color:var(--ink2);line-height:1.8}
.ss-shots{display:flex;align-items:flex-start;gap:16px;flex:none}
.ss-shots figure{margin:0;flex:none}
/* 高度写死（148 宽 × 811/400），同样是防 Safari 把 height:auto 的图撑开 */
.ss-shots img{
  display:block;width:148px;height:300px;object-fit:cover;object-position:center top;
  border-radius:20px;border:1px solid #EDE7DB;
  box-shadow:0 8px 22px rgba(80,60,30,.08);
}
.ss-shots figcaption{
  margin-top:9px;font-size:11.5px;color:var(--ink3);text-align:center;letter-spacing:.01em;
}
/* ---------- 深色三条 ---------- */
.sec-brand{background:var(--brand-deep);color:#fff;position:relative;overflow:hidden}
.sec-brand::after{
  content:"";position:absolute;width:620px;height:620px;right:-200px;top:-240px;
  background:radial-gradient(circle,rgba(127,209,193,.16),transparent 62%);
}
.three{display:grid;grid-template-columns:repeat(3,1fr);gap:0;position:relative}
.t3{padding:0 34px;border-left:1px solid rgba(255,255,255,.14)}
.t3:first-child{padding-left:0;border-left:0}
.t3-no{font-size:12px;font-weight:700;color:#7FD1C1;letter-spacing:.12em}
.t3 h3{font-size:19px;font-weight:800;margin:14px 0 10px}
.t3 p{font-size:14px;color:#CFE3DE;line-height:1.85}

/* ---------- 图图 + 学园 ---------- */
.buddy{display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:start}
.buddy-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-xl);padding:36px;
  display:grid;grid-template-columns:120px 1fr;gap:26px;align-items:center;
}
.buddy-art{
  width:120px;height:120px;border-radius:50%;background:#FDF3E6;
  display:grid;place-items:center;
}
.buddy-copy h2{font-size:24px;font-weight:800;margin-bottom:12px}
.buddy-copy p{font-size:14.5px;color:var(--ink2)}
.acad{background:#fff;border:1px solid var(--line);border-radius:var(--r-xl);padding:26px 26px 18px}
.acad-head{display:flex;align-items:baseline;justify-content:space-between;gap:10px;margin-bottom:14px}
.acad-head h3{font-size:17px;font-weight:800}
.acad-head span{font-size:12px;color:var(--ink3)}
.acad-list{list-style:none;margin:0;padding:0;counter-reset:a}
.acad-list li{
  display:flex;gap:10px;font-size:13px;color:var(--ink2);padding:8px 0;
  border-top:1px solid #F4EFE6;line-height:1.6;
}
.acad-list li:first-child{border-top:0}
.acad-list b{
  font-size:10.5px;font-weight:700;color:var(--brand-deep);background:var(--brand-soft);
  border-radius:6px;padding:1px 7px;height:fit-content;flex:none;margin-top:2px;
}

/* ---------- 下载 ---------- */
.download{
  background:linear-gradient(165deg,#2A6E62 0%,#1F5148 100%);
  color:#fff;position:relative;overflow:hidden;
}
.download::before{
  content:"";position:absolute;width:760px;height:760px;left:-240px;bottom:-420px;
  background:radial-gradient(circle,rgba(127,209,193,.18),transparent 62%);
}
.dl-in{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center;position:relative}
.dl-copy h2{font-size:clamp(26px,3.2vw,40px);font-weight:800;color:#fff}
.dl-copy>p{margin-top:16px;color:#CFE3DE;font-size:16px;max-width:30em}
.dl-btns{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}
.dl-ios{margin-top:18px;font-size:13.5px;color:#A9C7C1}
.dl-ios b{color:#DCEFEA;font-weight:600}
.dl-how{margin-top:34px;display:flex;flex-direction:column;gap:10px}
.dl-step{display:flex;align-items:flex-start;gap:10px;font-size:13.5px;color:#CFE3DE}
.dl-step span{
  width:20px;height:20px;border-radius:50%;background:rgba(255,255,255,.16);
  display:grid;place-items:center;font-size:11px;font-weight:700;color:#fff;flex:none;margin-top:1px;
}
.dl-art{display:flex;justify-content:center}
.qr-card{
  background:#fff;border-radius:24px;padding:26px 26px 22px;text-align:center;
  box-shadow:0 24px 60px rgba(0,0,0,.2);color:var(--ink);
}
.qr-box{width:188px;height:188px;margin:0 auto 16px;display:grid;place-items:center;background:#fff}
.qr-box img{width:100%}
.qr-card p{font-size:14px;font-weight:700}
.qr-card span{font-size:11px;color:var(--ink3);display:block;margin-top:6px;word-break:break-all}
.qr-card code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11px}

/* ---------- FAQ ---------- */
.faq-wrap{max-width:820px}
.faq{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-m);
  padding:4px 22px;margin-bottom:10px;transition:border-color .18s;
}
.faq[open]{border-color:#CFE3DE;box-shadow:var(--shadow)}
.faq summary{
  cursor:pointer;list-style:none;font-weight:600;font-size:15.5px;padding:16px 0;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"+";font-size:20px;font-weight:400;color:var(--brand);flex:none;
  transition:transform .2s;line-height:1;
}
.faq[open] summary::after{transform:rotate(45deg)}
.faq p{padding:0 0 18px;font-size:14.5px;color:var(--ink2);line-height:1.85;margin:0;max-width:64ch}

/* ---------- 页脚 ---------- */
.foot{background:#1B1A17;color:#B9B4A9;padding:48px 0 40px}
.foot-in{display:grid;grid-template-columns:1.2fr .8fr 1fr;gap:24px;align-items:center}
.foot-brand{display:flex;align-items:center;gap:12px}
.foot-brand img{width:38px;height:38px;border-radius:10px}
.foot-brand b{display:block;color:#fff;font-size:15px}
.foot-brand span{font-size:12px;color:#8C8779}
.foot-links{display:flex;gap:22px;font-size:13.5px;flex-wrap:wrap}
.foot-links a:hover{color:#fff}
.foot-legal{font-size:12px;color:#7E7A6E;text-align:right;line-height:1.8}
.foot-legal .sep{margin:0 4px}
.foot-legal a{color:#A8A296;border-bottom:1px solid rgba(168,162,150,.35);padding-bottom:1px}
.foot-legal a:hover{color:#fff;border-bottom-color:rgba(255,255,255,.5)}

/* ---------- 滚动出现 ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:980px){
  .hero-in{grid-template-columns:1fr;gap:8px}
  .hero-visual{order:2;padding-bottom:20px}
  .fc-1{left:0;top:40px}
  .fc-2{right:0;bottom:24px}
  .path-in,.dl-in,.buddy{grid-template-columns:1fr;gap:36px}
  .duo{grid-template-columns:1fr}
  .three{grid-template-columns:1fr;gap:24px}
  .t3{padding:0;border-left:0}
  .t3+.t3{border-top:1px solid rgba(255,255,255,.14);padding-top:24px}
  .stats-in{grid-template-columns:repeat(2,1fr);gap:22px}
  .steps4{grid-template-columns:1fr 1fr}
  .foot-in{grid-template-columns:1fr;gap:20px;text-align:left}
  .foot-legal{text-align:left}
  .sec{padding:72px 0}
}
@media (max-width:720px){
  .nav-links{display:none}
  .nav-burger{display:block}
  .nav-in{gap:12px;height:62px}
  .brand{font-size:16px}
  .nav.open .nav-links{
    display:flex;flex-direction:column;position:absolute;left:0;right:0;top:62px;
    background:#fff;border-bottom:1px solid var(--line);padding:14px 24px;gap:4px;
    box-shadow:0 12px 30px rgba(80,60,30,.08);
  }
  .nav.open .nav-links a{padding:10px 0;font-size:15px}
  .hero{padding:36px 0 20px}
  .hero h1{font-size:32px}
  .lead{font-size:15.5px}
  .hero-cta .btn{flex:1;justify-content:center}
  .phone{width:280px}
  .screen{border-radius:32px}
  .shot-strip{flex-direction:column;align-items:flex-start;gap:22px;padding:24px}
  .ss-shots{width:100%;justify-content:center}
  .float-card{display:none}
  .steps4{grid-template-columns:1fr}
  .buddy-card{grid-template-columns:1fr;text-align:left;padding:26px}
  .buddy-art{width:88px;height:88px}
  .buddy-art svg{width:72px;height:72px}
  .duo-card{padding:24px}
  .dl-btns .btn{flex:1;justify-content:center}
  .qr-card{padding:20px}
  .qr-box{width:160px;height:160px}
  .stairs{padding:22px 16px}
  .stair-bar{padding:9px 11px}
  .sec-head{margin-bottom:36px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}
@media (max-width:400px){
  .hero h1{font-size:27px}
  .hero-cta{gap:10px}
  .hero-cta .btn{font-size:14.5px;padding:13px 16px;gap:6px}
  .wrap{padding:0 18px}
}
/* 小屏收窄机身：宽度减到 224，高度按同一比例重算，不靠 auto 撑高 */
@media (max-width:360px){
  .mini-phone{width:224px;height:452px}
  .duo-card.kid .mini-phone{height:338px}
  .ss-shots{gap:12px}
  .ss-shots img{width:104px;height:211px}
}

/* ---------- 文档页（隐私政策 / 用户协议） ---------- */
.doc-wrap{max-width:820px;margin:0 auto;padding:0 24px}
.doc-top{padding:36px 0 8px}
.doc-back{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--ink3)}
.doc-back:hover{color:var(--brand)}
.doc-head{padding:18px 0 8px;border-bottom:1px solid var(--line)}
.doc-head h1{font-size:clamp(24px,3vw,34px);font-weight:800}
.doc-meta{margin-top:12px;font-size:13px;color:var(--ink3)}
.doc{padding:26px 0 72px;font-size:15.5px;line-height:1.9;color:var(--ink2)}
.doc h2{
  font-size:19px;font-weight:800;color:var(--ink);margin:34px 0 12px;
  padding-left:12px;border-left:4px solid var(--brand);line-height:1.4;
}
.doc h2:first-child{margin-top:6px}
.doc h3{font-size:16px;font-weight:700;color:var(--ink);margin:22px 0 8px}
.doc p{margin:10px 0}
.doc ul,.doc ol{margin:10px 0;padding-left:22px}
.doc li{margin:6px 0}
.doc b,.doc strong{color:var(--ink)}
.doc a{color:var(--brand);border-bottom:1px solid rgba(42,110,98,.3)}
.doc a:hover{border-bottom-color:var(--brand)}
.doc table{width:100%;border-collapse:collapse;margin:14px 0;font-size:14px}
.doc th,.doc td{border:1px solid var(--line);padding:9px 11px;text-align:left;vertical-align:top}
.doc th{background:var(--brand-mist);color:var(--ink);font-weight:700;white-space:nowrap}
.doc-note{
  background:var(--brand-mist);border:1px solid #DDEBE7;border-radius:14px;
  padding:14px 16px;margin:16px 0;font-size:14.5px;color:var(--ink2);
}
/* 协议页目录：长文档先给一张「查什么点哪」的索引 */
.doc-toc{
  background:#fff;border:1px solid var(--line);border-radius:16px;
  padding:16px 18px 14px;margin:18px 0 26px;box-shadow:var(--shadow);
}
.doc-toc>b{
  display:block;font-size:13px;color:var(--ink3);font-weight:700;
  margin-bottom:8px;letter-spacing:.02em;
}
.doc-toc ol{
  margin:0;padding:0;list-style:none;counter-reset:toc;
  display:grid;grid-template-columns:1fr 1fr;gap:0 22px;
}
.doc-toc li{counter-increment:toc;margin:0}
.doc-toc a{
  display:block;padding:6px 0;font-size:14px;color:var(--ink2);
  border-bottom:none;line-height:1.5;
}
.doc-toc a:hover{color:var(--brand)}
.doc-toc a::before{
  content:counter(toc,decimal-leading-zero);margin-right:9px;
  font-size:11.5px;color:var(--ink3);font-variant-numeric:tabular-nums;
}
@media (max-width:560px){
  .doc-toc ol{grid-template-columns:1fr;gap:0}
}
/* 锚点跳转别被吸顶导航挡住 */
.doc h2[id]{scroll-margin-top:88px}
.doc-note b{color:var(--brand-deep)}
@media (max-width:720px){
  .doc{padding:20px 0 56px;font-size:15px}
  .doc table{display:block;overflow-x:auto;white-space:nowrap}
  .doc th,.doc td{white-space:normal;min-width:110px}
}

/* 阶梯右侧的集数列：与柱长解绑（柱长表示层级高低，不是集数多少） */
.stair-bar{max-width:calc(100% - 72px)}
.stair-cnt{flex:none;width:56px;font-size:12.5px;color:var(--ink3);text-align:right;font-variant-numeric:tabular-nums}