/* ============================================================
   月汐 YueXi 官网 · 二级页面共享样式 v5「浅海极光」
   高饱和浅海底色 · 极光云雾 · 清透毛玻璃（与首页同一体系）
   ============================================================ */
:root{
  --ink:#0c2242;
  --ink2:rgba(13,38,74,.68);
  --ink3:rgba(13,38,74,.45);
  --brand:#0a6cff;
  --brand-deep:#0a54d0;
  --brand-soft:rgba(10,108,255,.09);
  --gold:#9a7414;
  --line:rgba(20,80,190,.14);
  --glass:rgba(255,255,255,.44);
  --glass-strong:rgba(255,255,255,.5);
  --shadow-sm:0 1px 2px rgba(12,40,90,.05),0 8px 28px rgba(12,40,90,.07);
  --r-lg:22px;--r-md:16px;--r-sm:12px;
  --font:'Inter','PingFang SC','HarmonyOS Sans SC','Microsoft YaHei','Segoe UI',-apple-system,BlinkMacSystemFont,sans-serif;
  --mono:'JetBrains Mono','Cascadia Mono',Consolas,monospace;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  color:var(--ink);
  font-family:var(--font);
  font-size:16px;line-height:1.72;
  line-height:1.72;
  min-height:100vh;
  display:flex;
  flex-direction:column;
  -webkit-font-smoothing:antialiased;
  overflow-x:clip; /* clip 而非 hidden:hidden 会把 body 变成滚动容器,导致 sticky 导航失效 */
  background:#d9ecff;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background-image:linear-gradient(rgba(30,110,230,.09) 1px,transparent 1px),linear-gradient(90deg,rgba(30,110,230,.09) 1px,transparent 1px);
  background-size:44px 44px;
  -webkit-mask-image:radial-gradient(ellipse 110% 70% at 50% 0%,#000 40%,transparent 92%);
  mask-image:radial-gradient(ellipse 110% 70% at 50% 0%,#000 40%,transparent 92%);
}
/* 极光底色:fixed 元素承载(替代 background-attachment:fixed,
   后者与吸顶毛玻璃导航的 backdrop-filter 叠加会触发 Chromium 黑屏合成 bug) */
body::after{
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(ellipse 70% 55% at 12% -5%,rgba(43,127,255,.34),transparent 62%),
    radial-gradient(ellipse 60% 50% at 92% 8%,rgba(34,211,238,.28),transparent 62%),
    radial-gradient(ellipse 55% 40% at 82% 78%,rgba(124,92,246,.18),transparent 65%),
    radial-gradient(ellipse 60% 45% at 8% 92%,rgba(45,212,191,.22),transparent 65%),
    linear-gradient(180deg,#eef6ff 0%,#d9ecff 30%,#c2ddff 68%,#ddeeff 100%);
}
a{color:var(--brand);text-decoration:none;}
strong{font-weight:650;color:var(--brand-deep);}
b{font-weight:620;color:var(--ink);}
a:hover{color:var(--brand-deep);}
img{max-width:100%;}

/* 顶部滚动进度线（与首页一致） */
.scroll-progress{
  position:fixed;top:0;left:0;z-index:120;width:100%;height:2px;
  background:linear-gradient(90deg,#1e7bff,#00b3e6 55%,#6f5bff);
  transform:scaleX(0);transform-origin:0 0;pointer-events:none;
}

/* ---------- 顶部导航（毛玻璃） ---------- */
.site-nav{
  position:sticky;top:0;z-index:100;
  display:flex;align-items:center;gap:18px;
  padding:0 clamp(16px,4vw,48px);height:60px;
  background:rgba(238,246,255,.6);
  backdrop-filter:blur(18px) saturate(1.5);
  -webkit-backdrop-filter:blur(18px) saturate(1.5);
  border-bottom:1px solid var(--line);
}
.site-nav .logo{display:flex;align-items:center;gap:9px;color:var(--ink);}
.site-nav .logo img{width:28px;height:28px;}
.site-nav .logo b{font-weight:600;font-size:1.06rem;letter-spacing:-.01em;}
.site-nav .logo small{font-family:var(--mono);font-weight:600;font-size:.6rem;letter-spacing:.2em;color:var(--ink3);margin-top:4px;}
.site-nav nav{margin-left:auto;display:flex;gap:2px;flex-wrap:wrap;}
.site-nav nav a{
  color:var(--ink2);font-weight:400;font-size:.9rem;
  padding:7px 14px;border-radius:999px;
  transition:color .2s,background-color .2s;
}
.site-nav nav a:hover{color:var(--ink);background:rgba(255,255,255,.6);}
.site-nav nav a.active{background:linear-gradient(135deg,#1e7bff,#0a54d0);color:#fff;}
.site-nav .nav-cta{
  margin-left:6px;display:inline-flex;align-items:center;gap:6px;
  background:linear-gradient(135deg,#1e7bff,#0a54d0);
  color:#fff;font-weight:500;font-size:.88rem;
  padding:7px 17px;border-radius:999px;
  box-shadow:0 4px 18px rgba(30,123,255,.32);
  transition:transform .2s ease,box-shadow .2s ease;
}
.site-nav .nav-cta:hover{color:#fff;transform:translateY(-1px);box-shadow:0 8px 26px rgba(30,123,255,.42);}
.site-nav .nav-cta-ghost{
  margin-left:6px;display:inline-flex;align-items:center;gap:6px;
  background:rgba(255,255,255,.55);color:var(--ink);
  font-weight:500;font-size:.88rem;padding:6px 16px;border-radius:999px;
  border:1px solid rgba(20,80,190,.22);
  transition:transform .2s ease,background .2s ease;
}
.site-nav .nav-cta-ghost:hover{color:#0a54d0;background:#fff;transform:translateY(-1px);}
@media (max-width:860px){
  .site-nav{flex-wrap:wrap;height:auto;padding:12px clamp(16px,4vw,48px);}
  .site-nav nav{margin-left:0;width:100%;order:3;}
  .site-nav .nav-cta{margin-left:auto;}
}

/* ---------- 页面主体 ---------- */
.page{
  flex:1;width:100%;max-width:1080px;margin:0 auto;
  padding:clamp(36px,6vw,64px) clamp(18px,4vw,32px) 72px;
  position:relative;
}
.page-hero{margin-bottom:clamp(30px,5vw,48px);}
.page-hero .crumb{
  font-family:var(--mono);font-size:.74rem;font-weight:400;
  letter-spacing:.08em;color:var(--ink3);margin-bottom:14px;
}
.page-hero .crumb a{color:var(--ink3);}
.page-hero .crumb a:hover{color:var(--brand);}
.page-hero h1{
  font-family:var(--font-light);font-weight:200;
  font-size:clamp(2.2rem,4.8vw,3.2rem);
  letter-spacing:0;line-height:1.16;
  background:linear-gradient(115deg,#0a6cff 8%,#00b3e6 52%,#6f5bff 95%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.page-hero .sub{margin-top:14px;color:var(--ink2);font-size:1.04rem;max-width:44em;}
.section{margin-top:clamp(32px,5vw,52px);}
.section>h2{
  font-weight:400;
  font-size:clamp(1.6rem,3vw,2.05rem);letter-spacing:-.01em;
  display:flex;align-items:center;gap:12px;margin-bottom:18px;
}
.section>h2::before{
  content:"";width:5px;height:22px;border-radius:3px;
  background:linear-gradient(180deg,#1e7bff,#5cc2ff);flex:none;
}
.section>p{margin-bottom:12px;color:var(--ink2);}
.section p strong,.section li strong{color:var(--ink);}
.card{
  background:rgba(255,255,255,.44);backdrop-filter:blur(16px) saturate(1.5);-webkit-backdrop-filter:blur(16px) saturate(1.5);
  border:1px solid rgba(255,255,255,.72);border-radius:var(--r-md);
  padding:24px 26px;
  transition:transform .25s ease,box-shadow .25s ease;
}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);}
.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:14px;}
.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;}
.card h3{font-size:1.04rem;font-weight:600;margin-bottom:8px;color:var(--ink);}
.card p{font-size:.92rem;margin-bottom:0;color:var(--ink2);}
.chip{
  display:inline-block;padding:3px 12px;border-radius:999px;
  font-family:var(--mono);font-size:.68rem;font-weight:600;letter-spacing:.06em;
  background:var(--brand-soft);color:var(--brand);margin-bottom:10px;
}
.chip.gold{background:rgba(209,168,75,.18);color:var(--gold);}
ul.plain{list-style:none;}
ul.plain li{padding:8px 0 8px 26px;position:relative;color:var(--ink2);font-size:.95rem;}
ul.plain li::before{
  content:"";position:absolute;left:4px;top:18px;
  width:7px;height:7px;border-radius:50%;
  background:linear-gradient(135deg,#1e7bff,#5cc2ff);
}
table.tbl{width:100%;border-collapse:collapse;font-size:.92rem;}
table.tbl th,table.tbl td{padding:11px 14px;border-bottom:1px solid rgba(20,80,190,.1);text-align:left;vertical-align:top;}
table.tbl th{color:var(--brand-deep);font-weight:500;white-space:nowrap;background:rgba(30,123,255,.07);}
table.tbl td{color:var(--ink2);}
table.tbl td:first-child{color:var(--ink);font-weight:500;white-space:nowrap;}
.note{
  background:rgba(30,123,255,.07);border:1px dashed rgba(30,123,255,.28);
  border-radius:var(--r-sm);padding:14px 18px;
  font-size:.9rem;color:var(--ink2);
}
.note strong{color:var(--brand-deep);}

/* ---------- 联系页二维码 ---------- */
.qr-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;}
.qr-card{text-align:center;}
.qr-card img{
  width:200px;height:200px;object-fit:contain;margin:0 auto;
  border-radius:var(--r-sm);border:1px solid rgba(255,255,255,.8);background:#fff;
  box-shadow:var(--shadow-sm);
}
.qr-card .wechat-id{
  display:inline-block;margin-top:10px;padding:6px 18px;border-radius:999px;
  background:var(--brand-soft);color:var(--brand-deep);
  font-family:var(--mono);font-weight:600;font-size:1rem;letter-spacing:.05em;
}

/* ---------- 页脚 ---------- */
.site-footer{
  border-top:1px solid var(--line);
  background:rgba(255,255,255,.4);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  padding:46px clamp(18px,4vw,48px) 26px;
}
.footer-inner{max-width:1180px;margin:0 auto;}
.footer-cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:26px;margin-bottom:26px;}
.footer-cols .h{font-weight:600;font-size:.88rem;color:var(--ink);margin-bottom:10px;}
.footer-cols ul{list-style:none;}
.footer-cols li{margin-bottom:7px;}
.footer-cols a,.footer-cols span{color:var(--ink2);font-size:.86rem;}
.footer-cols a:hover{color:var(--brand);}
.footer-brand{display:flex;align-items:center;gap:9px;margin-bottom:10px;}
.footer-brand img{width:26px;height:26px;}
.footer-brand b{font-weight:600;font-size:1.02rem;}
.footer-desc{color:var(--ink2);font-size:.84rem;max-width:26em;}
.footer-bottom{
  border-top:1px solid var(--line);padding-top:16px;
  display:flex;flex-wrap:wrap;gap:8px 22px;align-items:center;justify-content:space-between;
  color:var(--ink3);font-size:.76rem;
}
.footer-bottom a{color:var(--ink3);}
.footer-bottom a:hover{color:var(--brand);}

/* 更新日志页版本标题 */
.card h2{font-size:1.05rem;font-weight:600;}
.badge{
  display:inline-block;margin-left:8px;padding:2px 10px;border-radius:999px;
  background:var(--brand-soft);color:var(--brand);
  font-family:var(--mono);font-size:.68rem;font-weight:600;
}
.card .meta{color:var(--ink3);font-size:.76rem;margin-bottom:12px;font-family:var(--mono);}
.card ul{padding-left:20px;}
.card ul li{font-size:.9rem;line-height:1.8;color:var(--ink2);}

/* ============================================================
   POD 教程（tutorial*.html）· 长文阅读组件
   ============================================================ */

/* 章节眉标（page-hero 里的「第 N 章 · xx篇」） */
.chip.lesson{
  font-size:.72rem;padding:5px 14px;margin-bottom:14px;
  background:linear-gradient(135deg,rgba(30,123,255,.14),rgba(111,91,255,.12));
  color:var(--brand-deep);
}

/* 教程长文排版 */
.prose p{color:var(--ink2);font-size:.97rem;margin:0 0 14px;}
.prose h3{font-size:1.2rem;font-weight:600;color:var(--ink);margin:30px 0 12px;}
.prose h4{font-size:1rem;font-weight:600;color:var(--ink);margin:22px 0 8px;}
.prose ul,.prose ol{margin:0 0 14px 24px;color:var(--ink2);font-size:.95rem;}
.prose li{margin-bottom:7px;}
.prose li strong,.prose p strong{color:var(--ink);}
.prose img{border-radius:var(--r-sm);}
.prose blockquote{
  margin:16px 0;padding:10px 18px;border-left:3px solid rgba(30,123,255,.4);
  color:var(--ink3);font-size:.92rem;background:rgba(255,255,255,.35);
  border-radius:0 var(--r-sm) var(--r-sm) 0;
}

/* 页内目录 */
.toc{
  background:rgba(255,255,255,.44);backdrop-filter:blur(16px);
  border:1px solid rgba(255,255,255,.72);border-radius:var(--r-md);
  padding:18px 24px;margin:0 0 26px;
}
.toc .h{font-weight:600;font-size:.88rem;color:var(--ink);margin-bottom:8px;}
.toc ol{margin:0 0 0 20px;font-size:.92rem;}
.toc li{margin-bottom:5px;}
.toc a{color:var(--ink2);}
.toc a:hover{color:var(--brand);}

/* 配图 */
.figure{margin:24px 0;}
.figure img{
  display:block;width:100%;
  border-radius:var(--r-md);border:1px solid rgba(255,255,255,.85);
  background:#fff;box-shadow:var(--shadow-sm);
}
.figure figcaption{margin-top:9px;text-align:center;color:var(--ink3);font-size:.82rem;}
.figure.duo{display:grid;grid-template-columns:1fr 1fr;gap:14px;align-items:start;}
.figure.duo img{height:100%;object-fit:cover;}
@media (max-width:720px){.figure.duo{grid-template-columns:1fr;}}

/* 编号步骤 */
.steps{list-style:none;counter-reset:step;margin:20px 0;}
.steps li{counter-increment:step;position:relative;padding:0 0 22px 52px;}
.steps li::before{
  content:counter(step);position:absolute;left:0;top:0;
  width:32px;height:32px;border-radius:50%;
  background:linear-gradient(135deg,#1e7bff,#0a54d0);color:#fff;
  font-weight:600;font-size:.9rem;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 14px rgba(30,123,255,.3);
}
.steps li::after{
  content:"";position:absolute;left:15.5px;top:38px;bottom:4px;width:1px;
  background:linear-gradient(180deg,rgba(30,123,255,.35),rgba(30,123,255,.1));
}
.steps li:last-child{padding-bottom:4px;}
.steps li:last-child::after{display:none;}
.steps h4{margin:4px 0 5px;}
.steps p{margin:0 0 8px;}

/* 提示框 */
.callout{
  border-radius:var(--r-sm);padding:15px 19px;margin:20px 0;
  font-size:.92rem;border:1px solid;position:relative;
}
.callout .t{font-weight:600;display:flex;align-items:center;gap:8px;margin-bottom:5px;}
.callout p{margin:0 0 6px;}
.callout p:last-child{margin-bottom:0;}
.callout.tip{border-color:rgba(30,123,255,.28);background:rgba(30,123,255,.07);}
.callout.tip .t{color:var(--brand-deep);}
.callout.warn{border-color:rgba(209,168,75,.5);background:rgba(209,168,75,.12);}
.callout.warn .t{color:var(--gold);}
.callout.danger{border-color:rgba(214,69,69,.4);background:rgba(214,69,69,.09);}
.callout.danger .t{color:#c23a3a;}
.callout ul{margin:4px 0 0 20px;}

/* 自检清单 */
.checklist{list-style:none;margin:14px 0;}
.checklist li{position:relative;padding:7px 0 7px 32px;color:var(--ink2);font-size:.94rem;}
.checklist li::before{
  content:"✓";position:absolute;left:2px;top:9px;
  width:21px;height:21px;border-radius:7px;
  background:rgba(34,197,94,.16);color:#15803d;
  font-size:.78rem;font-weight:700;
  display:flex;align-items:center;justify-content:center;
}
.checklist li strong{color:var(--ink);}

/* 上一章 / 下一章 */
.pager{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:44px;}
.pager a{
  display:block;padding:16px 20px;border-radius:var(--r-md);
  background:rgba(255,255,255,.44);backdrop-filter:blur(16px);
  border:1px solid rgba(255,255,255,.72);
  transition:transform .25s ease,box-shadow .25s ease;
}
.pager a:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm);color:var(--brand-deep);}
.pager .dir{display:block;font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;color:var(--ink3);margin-bottom:5px;}
.pager .name{font-weight:600;font-size:.95rem;color:var(--ink);}
.pager .next{text-align:right;}
@media (max-width:640px){.pager{grid-template-columns:1fr;}.pager .next{text-align:left;}}

/* 教程章节卡（hub 页） */
.lesson-card h3{font-size:1.05rem;}
.lesson-card .go{
  display:inline-block;margin-top:12px;font-size:.86rem;font-weight:500;color:var(--brand);
}
.lesson-card:hover .go{color:var(--brand-deep);}

/* 声明条（非官方/时效声明） */
.disclaimer{
  margin-top:34px;padding:13px 18px;border-radius:var(--r-sm);
  background:rgba(255,255,255,.4);border:1px dashed rgba(20,80,190,.22);
  color:var(--ink3);font-size:.8rem;line-height:1.7;
}

/* ---------- 页面级大 CTA 按钮 ---------- */
.cta-row{display:flex;gap:14px;flex-wrap:wrap;align-items:center;margin-top:28px;}
.cta-btn{
  display:inline-flex;align-items:center;gap:9px;
  padding:16px 38px;border-radius:999px;
  font-weight:600;font-size:1.08rem;letter-spacing:.01em;text-decoration:none;
  transition:transform .25s ease,box-shadow .25s ease,background .25s ease;
}
.cta-btn.primary{
  background:linear-gradient(135deg,#1e7bff,#0a54d0);color:#fff;
  box-shadow:0 10px 30px rgba(30,123,255,.45);
}
.cta-btn.primary:hover{color:#fff;transform:translateY(-3px) scale(1.02);box-shadow:0 16px 42px rgba(30,123,255,.58);}
.cta-btn.ghost{
  background:rgba(255,255,255,.68);color:var(--brand-deep);
  border:1.5px solid rgba(20,80,190,.32);
}
.cta-btn.ghost:hover{transform:translateY(-3px);background:#fff;color:var(--brand);box-shadow:var(--shadow-sm);}
@media (max-width:640px){.cta-btn{width:100%;justify-content:center;}}

/* ============================================================
   POD 教程 v2 · 动效 / 交互 / 后台示意图组件
   ============================================================ */

/* ---------- 滚动浮现 ---------- */
.rv{opacity:0;transform:translateY(20px) scale(.985);transition:opacity .65s cubic-bezier(.2,.7,.3,1),transform .65s cubic-bezier(.2,.7,.3,1);}
.rv-in{opacity:1;transform:none;}
.steps > li.rv{opacity:0;transform:translateX(-14px);}
.steps > li.rv-in{opacity:1;transform:none;}
.steps > li.rv-in::before{animation:pop .5s cubic-bezier(.3,1.6,.5,1) both;}
@keyframes pop{from{transform:scale(.4);}to{transform:scale(1);}}
.page-hero.rv-hero{opacity:0;transform:translateY(14px);}
.page-hero.rv-hero.rv-hero-in{opacity:1;transform:none;transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.3,1);}
@media (prefers-reduced-motion:reduce){
  .rv,.steps>li.rv,.page-hero{opacity:1 !important;transform:none !important;transition:none !important;}
}

/* 滚动浮现偏好关闭时的兜底由 JS 处理 */

/* ---------- 学习进度浮标 ---------- */
.tut-progress{
  position:fixed;right:18px;bottom:18px;z-index:90;
  display:flex;align-items:center;gap:9px;
  padding:9px 14px;border-radius:999px;
  background:rgba(255,255,255,.78);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:1px solid rgba(255,255,255,.9);
  box-shadow:0 6px 24px rgba(12,40,90,.14);
  transition:transform .25s ease,box-shadow .25s ease;
}
.tut-progress:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(12,40,90,.2);color:var(--brand-deep);}
.tut-progress .tp-num{font-family:var(--mono);font-weight:600;font-size:1rem;color:var(--brand-deep);}
.tut-progress .tp-num i{font-style:normal;font-size:.7rem;color:var(--ink3);}
.tut-progress .tp-bar{width:64px;height:6px;border-radius:99px;background:rgba(20,80,190,.14);overflow:hidden;}
.tut-progress .tp-bar i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,#1e7bff,#00b3e6);transition:width .6s cubic-bezier(.2,.7,.3,1);}
.tut-progress .tp-txt{font-size:.74rem;color:var(--ink2);font-weight:500;max-width:9em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.tut-progress.done .tp-txt{color:#15803d;}
@media (max-width:720px){.tut-progress{right:12px;bottom:12px;padding:7px 11px;}.tut-progress .tp-txt{display:none;}}

/* hub 章节卡已学标记 */
.lesson-done{position:relative;}
.lesson-done .done-tick{
  font-size:.72rem;color:#15803d;background:rgba(34,197,94,.14);
  padding:2px 8px;border-radius:99px;margin-left:6px;font-weight:600;
}

/* ---------- Tab 切换 ---------- */
.tab-btns{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px;}
.tab-btn{
  padding:8px 18px;border-radius:999px;border:1px solid rgba(20,80,190,.22);
  background:rgba(255,255,255,.5);color:var(--ink2);font-size:.9rem;font-weight:500;
  cursor:pointer;transition:all .25s ease;font-family:var(--font);
}
.tab-btn:hover{color:var(--brand-deep);background:#fff;transform:translateY(-1px);}
.tab-btn.on{
  background:linear-gradient(135deg,#1e7bff,#0a54d0);color:#fff;border-color:transparent;
  box-shadow:0 4px 16px rgba(30,123,255,.35);
}
.tab-panel{display:none;}
.tab-panel.on{display:block;animation:fadeUp .45s cubic-bezier(.2,.7,.3,1);}
@keyframes fadeUp{from{opacity:0;transform:translateY(10px);}to{opacity:1;transform:none;}}

/* ---------- FAQ 手风琴 ---------- */
details.faq{
  background:rgba(255,255,255,.44);border:1px solid rgba(255,255,255,.72);
  border-radius:var(--r-sm);padding:0;margin-bottom:10px;overflow:hidden;
  transition:box-shadow .25s ease;
}
details.faq:hover{box-shadow:var(--shadow-sm);}
details.faq summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;gap:10px;
  padding:13px 18px;font-weight:600;font-size:.95rem;color:var(--ink);
}
details.faq summary::-webkit-details-marker{display:none;}
details.faq summary::after{
  content:"+";margin-left:auto;flex:none;width:22px;height:22px;border-radius:50%;
  background:var(--brand-soft);color:var(--brand);font-weight:600;
  display:flex;align-items:center;justify-content:center;font-size:1rem;
  transition:transform .3s ease,background .3s ease;
}
details.faq[open] summary::after{content:"−";transform:rotate(180deg);background:var(--brand);color:#fff;}
details.faq .faq-a{padding:0 18px 14px;color:var(--ink2);font-size:.93rem;line-height:1.8;}
details.faq[open]{animation:fadeUp .35s ease;}

/* ---------- 可勾选清单 ---------- */
ul.checklist li.ckable{display:flex;align-items:flex-start;gap:2px;cursor:pointer;}
ul.checklist input.ck-i{
  appearance:none;-webkit-appearance:none;flex:none;width:20px;height:20px;margin:4px 8px 0 -26px;
  border:2px solid rgba(20,80,190,.3);border-radius:6px;background:#fff;
  cursor:pointer;position:relative;transition:all .2s ease;
}
ul.checklist input.ck-i:checked{background:#16a34a;border-color:#16a34a;}
ul.checklist input.ck-i:checked::after{
  content:"✓";position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:.72rem;font-weight:700;
}
ul.checklist li.off > :not(input){opacity:.45;text-decoration:line-through;}
.ck-sum{
  font-family:var(--mono);font-size:.74rem;font-weight:600;color:var(--brand-deep);
  background:var(--brand-soft);display:inline-block;padding:4px 12px;border-radius:99px;margin-bottom:6px;
}

/* ---------- 一图速览 ---------- */
.quickview{margin:6px 0 30px;}
.qv-tag{
  display:inline-flex;align-items:center;gap:8px;margin-bottom:10px;
  font-family:var(--mono);font-size:.7rem;font-weight:600;letter-spacing:.14em;color:var(--brand-deep);
}
.qv-tag::before{content:"";width:22px;height:2px;background:linear-gradient(90deg,#1e7bff,#6f5bff);border-radius:2px;}
.quickview .qv-body{
  background:rgba(255,255,255,.5);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border:1px solid rgba(255,255,255,.78);border-radius:var(--r-lg);
  padding:clamp(14px,3vw,26px);box-shadow:var(--shadow-sm);
  overflow-x:auto;
}
.quickview svg{display:block;min-width:640px;width:100%;height:auto;}
.quickview svg text{font-family:var(--font);}
.quickview svg .mono{font-family:var(--mono);}
.qv-cap{margin-top:9px;text-align:center;color:var(--ink3);font-size:.8rem;}

/* SVG 通用动画（流程线流动） */
.flow-dash{stroke-dasharray:7 9;animation:dashmove 1.1s linear infinite;}
.flow-dash.slow{animation-duration:2s;}
@keyframes dashmove{to{stroke-dashoffset:-32;}}
@media (prefers-reduced-motion:reduce){.flow-dash{animation:none;}}
.ig .pop{animation:igpop .6s cubic-bezier(.3,1.5,.5,1) both;transform-origin:center;transform-box:fill-box;}
.ig .pop.d1{animation-delay:.15s;}.ig .pop.d2{animation-delay:.3s;}.ig .pop.d3{animation-delay:.45s;}
.ig .pop.d4{animation-delay:.6s;}.ig .pop.d5{animation-delay:.75s;}.ig .pop.d6{animation-delay:.9s;}
@keyframes igpop{from{opacity:0;transform:scale(.5);}to{opacity:1;transform:scale(1);}}

/* ---------- TEMU 后台示意图（mock 组件） ---------- */
:root{--temu:#f4680c;--temu-deep:#d95702;--temu-soft:rgba(244,104,12,.09);}
.mock{
  margin:24px 0;border-radius:14px;overflow:hidden;
  border:1px solid rgba(20,80,190,.16);
  background:#fff;box-shadow:0 10px 34px rgba(12,40,90,.13);
  font-family:var(--font);
}
.mock-bar{
  display:flex;align-items:center;gap:10px;padding:10px 16px;
  background:linear-gradient(90deg,#fff3ea,#ffe8d5);
  border-bottom:1px solid rgba(244,104,12,.18);
}
.mock-bar .dot{width:10px;height:10px;border-radius:50%;background:#ffd0a6;}
.mock-bar .dot:nth-child(1){background:#ffb35c;}
.mock-bar .t{font-size:.8rem;font-weight:600;color:var(--temu-deep);}
.mock-tag{
  margin-left:auto;font-family:var(--mono);font-size:.62rem;font-weight:600;letter-spacing:.1em;
  color:#a85a1f;background:rgba(244,104,12,.14);padding:3px 10px;border-radius:99px;
}
.mock-body{display:flex;min-height:220px;}
.mock-side{
  flex:none;width:172px;background:#faf7f4;border-right:1px solid #f0e6dd;
  padding:12px 9px;display:flex;flex-direction:column;gap:3px;
}
.mock-item{
  font-size:.78rem;color:#6b5b4d;padding:8px 11px;border-radius:8px;position:relative;white-space:nowrap;
}
.mock-item.on{background:var(--temu);color:#fff;font-weight:600;box-shadow:0 3px 10px rgba(244,104,12,.35);}
.mock-item .mi-ic{display:inline-block;width:14px;color:var(--temu);margin-right:5px;font-style:normal;}
.mock-item.on .mi-ic{color:#fff;}
.mock-main{flex:1;padding:16px 18px;min-width:0;}
.mock-h{font-size:.92rem;font-weight:700;color:#33261b;margin-bottom:12px;display:flex;align-items:center;gap:8px;flex-wrap:wrap;}
.mock-h .sub{font-weight:400;font-size:.72rem;color:#a08b78;}
.mock-crumb{font-size:.7rem;color:#b09a86;margin-bottom:8px;font-family:var(--mono);}
.mock-field{
  border:1px solid #e8dcd0;border-radius:8px;padding:9px 12px;margin-bottom:9px;
  font-size:.8rem;color:#54453a;background:#fffdfd;position:relative;
}
.mock-field .lb{font-size:.66rem;color:#b09a86;display:block;margin-bottom:2px;letter-spacing:.04em;}
.mock-field .val{color:#33261b;font-weight:500;}
.mock-field.hl{border-color:var(--temu);background:#fffaf6;box-shadow:0 0 0 3px rgba(244,104,12,.12);}
.mock-btn{
  display:inline-block;background:linear-gradient(135deg,#ff8a3c,var(--temu));color:#fff;
  font-size:.82rem;font-weight:600;padding:9px 20px;border-radius:8px;
  box-shadow:0 4px 14px rgba(244,104,12,.4);
}
.mock-btn.ghost{background:#fff;color:var(--temu-deep);border:1px solid rgba(244,104,12,.4);box-shadow:none;}
.mock-pill{display:inline-block;font-size:.66rem;font-weight:600;padding:2px 9px;border-radius:99px;margin-left:6px;vertical-align:1px;}
.mock-pill.ok{background:#e5f7eb;color:#15803d;}
.mock-pill.warn{background:#fef3c7;color:#a16207;}
.mock-pill.err{background:#fee2e2;color:#b91c1c;}
.mock-table{width:100%;border-collapse:collapse;font-size:.76rem;}
.mock-table th{background:#fdf3ea;color:#a85a1f;font-weight:600;text-align:left;padding:7px 10px;border-bottom:1px solid #f3e2d2;white-space:nowrap;}
.mock-table td{padding:7px 10px;border-bottom:1px solid #f6ede4;color:#54453a;}
.mock-table td:first-child{color:#33261b;font-weight:500;}
.mock-note{
  font-size:.72rem;color:#a08b78;margin-top:10px;display:flex;align-items:flex-start;gap:6px;
}
/* 步骤红圈标注 */
.step-dot{
  display:inline-flex;align-items:center;justify-content:center;flex:none;
  width:20px;height:20px;border-radius:50%;margin-right:7px;
  background:var(--temu);color:#fff;font-size:.68rem;font-weight:700;font-family:var(--mono);
  box-shadow:0 0 0 3px rgba(244,104,12,.18);vertical-align:-5px;
}
.mock .pointed{position:relative;}
.mock .pointed::before{
  content:attr(data-step);position:absolute;top:-9px;left:-11px;z-index:2;
  width:20px;height:20px;border-radius:50%;
  background:#e11d48;color:#fff;font-size:.68rem;font-weight:700;font-family:var(--mono);
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 0 0 3px rgba(225,29,72,.15);
}
/* 手把手步骤条（操作序列） */
.ops{list-style:none;counter-reset:op;margin:18px 0;padding:0;}
.ops li{
  counter-increment:op;position:relative;padding:12px 16px 12px 52px;margin-bottom:10px;
  background:rgba(255,255,255,.55);border:1px solid rgba(255,255,255,.75);border-radius:12px;
  font-size:.92rem;color:var(--ink2);
}
.ops li::before{
  content:counter(op);position:absolute;left:14px;top:12px;
  width:24px;height:24px;border-radius:8px;
  background:linear-gradient(135deg,#1e7bff,#0a54d0);color:#fff;
  font-family:var(--mono);font-weight:700;font-size:.8rem;
  display:flex;align-items:center;justify-content:center;
}
.ops li b{color:var(--ink);}
.ops li .where{
  display:inline-block;font-family:var(--mono);font-size:.7rem;font-weight:600;color:var(--temu-deep);
  background:var(--temu-soft);border:1px dashed rgba(244,104,12,.4);border-radius:6px;
  padding:1px 8px;margin:0 2px;white-space:nowrap;
}

/* ---------- 数据可视化组件 ---------- */
/* 指标刻度条 */
.meter{margin:10px 0 16px;}
.meter .m-h{display:flex;justify-content:space-between;font-size:.8rem;color:var(--ink2);margin-bottom:5px;}
.meter .m-h b{color:var(--ink);}
.meter .m-bar{height:12px;border-radius:99px;background:rgba(20,80,190,.1);overflow:hidden;position:relative;}
.meter .m-bar i{
  display:block;height:100%;border-radius:99px;width:0;
  background:linear-gradient(90deg,#1e7bff,#00b3e6);
  transition:width 1.2s cubic-bezier(.2,.7,.3,1);
}
.rv-in .meter .m-bar i,.m-bar.in i{width:var(--w);}
.meter .m-mark{
  position:absolute;top:-4px;bottom:-4px;width:2px;background:#e11d48;border-radius:2px;
}
.meter .m-mark::after{
  content:attr(data-l);position:absolute;top:-17px;left:50%;transform:translateX(-50%);
  font-size:.62rem;color:#e11d48;font-weight:600;white-space:nowrap;font-family:var(--mono);
}
/* 甘特色带（全年节奏） */
.gantt{width:100%;font-size:.78rem;border-collapse:separate;border-spacing:0 4px;}
.gantt th{font-family:var(--mono);font-weight:600;color:var(--ink3);font-size:.66rem;padding:2px 3px;text-align:center;}
.gantt td.rowname{font-size:.8rem;color:var(--ink);font-weight:500;padding-right:10px;white-space:nowrap;}
.gantt .cell{height:16px;border-radius:5px;background:rgba(20,80,190,.06);}
.gantt .cell.on1{background:linear-gradient(135deg,#93c5fd,#60a5fa);}
.gantt .cell.on2{background:linear-gradient(135deg,#1e7bff,#0a54d0);}
.gantt .cell.on3{background:linear-gradient(135deg,#f59e0b,#ea580c);}
.gantt-legend{display:flex;gap:14px;flex-wrap:wrap;font-size:.72rem;color:var(--ink3);margin-top:8px;}
.gantt-legend i{display:inline-block;width:12px;height:12px;border-radius:4px;margin-right:4px;vertical-align:-1px;}
/* 数字卡 */
.numcard{text-align:center;padding:20px 14px;}
.numcard .n{
  font-family:var(--mono);font-weight:700;font-size:clamp(1.5rem,3vw,2.1rem);
  background:linear-gradient(115deg,#0a6cff,#00b3e6 60%,#6f5bff);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.numcard .l{font-size:.8rem;color:var(--ink3);margin-top:3px;}

/* ============================================================
   顶部导航 v2 · 居中悬浮玻璃胶囊岛（2026-09-24）
   入场滑落 / hover 滑动高亮 / 滚动收缩 / 更多下拉 / 移动端抽屉
   ============================================================ */
.float-nav{position:sticky;top:0;z-index:110;padding:14px 16px 6px;}
.fn-pill{
  position:relative;z-index:106;display:flex;align-items:center;gap:6px;
  width:min(1120px,100%);margin:0 auto;padding:9px 10px 9px 16px;
  border-radius:999px;
  background:linear-gradient(135deg,rgba(255,255,255,.74),rgba(255,255,255,.52));
  border:1px solid rgba(255,255,255,.78);
  box-shadow:0 1px 2px rgba(12,40,90,.06),0 14px 40px rgba(12,40,90,.13);
  -webkit-backdrop-filter:blur(18px) saturate(1.5);backdrop-filter:blur(18px) saturate(1.5);
  animation:fn-drop .7s cubic-bezier(.22,1.2,.36,1) both;
  transition:box-shadow .35s ease,padding .35s ease,background .35s ease;
}
@keyframes fn-drop{from{transform:translateY(-26px);opacity:0}to{transform:translateY(0);opacity:1}}
.float-nav.scrolled .fn-pill{
  padding-top:6px;padding-bottom:6px;
  background:linear-gradient(135deg,rgba(255,255,255,.9),rgba(255,255,255,.8));
  box-shadow:0 1px 2px rgba(12,40,90,.08),0 18px 46px rgba(12,40,90,.2);
}
.fn-logo{display:flex;align-items:center;gap:9px;margin-right:12px;flex:none;color:var(--ink);}
.fn-logo img{width:26px;height:26px;}
.fn-brand{display:flex;flex-direction:column;line-height:1.05;}
.fn-brand b{font-weight:600;font-size:1rem;letter-spacing:-.01em;color:var(--ink);white-space:nowrap;}
.fn-brand small{font-family:var(--mono);font-weight:600;font-size:.54rem;letter-spacing:.22em;color:var(--ink3);}
.fn-links{position:relative;display:flex;align-items:center;gap:2px;margin:0 auto;min-width:0;}
.fn-links>a,.fn-more-btn{
  position:relative;z-index:1;border:0;background:none;cursor:pointer;
  padding:8px 14px;border-radius:999px;font-size:.9rem;font-weight:500;color:var(--ink2);
  white-space:nowrap;display:flex;align-items:center;gap:4px;font-family:var(--font);
  transition:color .2s ease;
}
.fn-links>a:hover,.fn-more-btn:hover,.fn-links>a.active,.fn-more.has-active .fn-more-btn{color:var(--ink);}
.fn-links>a.active{color:#fff;}
.fn-slider{
  position:absolute;top:50%;left:0;z-index:0;height:34px;width:0;
  transform:translateY(-50%) translateX(0);border-radius:999px;
  background:linear-gradient(135deg,#1e7bff,#0a54d0);
  box-shadow:0 6px 18px rgba(30,123,255,.35);
  opacity:0;
  transition:transform .38s cubic-bezier(.22,1,.36,1),width .38s cubic-bezier(.22,1,.36,1),opacity .25s ease;
}
.float-nav.slider-on .fn-slider{opacity:1;}
.fn-more{position:relative;}
.fn-caret{width:10px;height:10px;transition:transform .25s ease;}
.fn-more.open .fn-caret{transform:rotate(180deg);}
.fn-more.has-active .fn-more-btn{color:var(--brand-deep);font-weight:600;}
.fn-menu{
  position:absolute;top:calc(100% + 12px);right:0;min-width:150px;padding:6px;
  background:rgba(255,255,255,.94);border:1px solid rgba(255,255,255,.85);border-radius:16px;
  box-shadow:0 18px 46px rgba(12,40,90,.18);
  -webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
  opacity:0;visibility:hidden;transform:translateY(-6px);transition:all .25s ease;
}
.fn-more.open .fn-menu{opacity:1;visibility:visible;transform:translateY(0);}
.fn-menu a{display:block;padding:9px 14px;border-radius:10px;color:var(--ink2);font-size:.9rem;white-space:nowrap;}
.fn-menu a:hover{background:var(--brand-soft);color:var(--brand-deep);}
.fn-menu a.active{background:linear-gradient(135deg,#1e7bff,#0a54d0);color:#fff;}
.fn-ctas{display:flex;align-items:center;gap:8px;margin-left:12px;flex:none;}
.fn-cta{padding:8px 16px;border-radius:999px;font-size:.86rem;font-weight:600;white-space:nowrap;color:#fff;background:linear-gradient(135deg,#1e7bff,#0a54d0);box-shadow:0 6px 18px rgba(30,123,255,.3);transition:all .2s ease;}
.fn-cta:hover{color:#fff;transform:translateY(-1px);box-shadow:0 10px 26px rgba(30,123,255,.45);}
.fn-cta-ghost{background:rgba(255,255,255,.55);color:var(--ink);box-shadow:none;border:1px solid rgba(255,255,255,.8);}
.fn-cta-ghost:hover{color:var(--brand-deep);background:#fff;box-shadow:none;}
.fn-burger{display:none;}
.fn-drawer{
  position:fixed;inset:0;z-index:105;display:flex;flex-direction:column;justify-content:center;gap:4px;
  padding:96px 28px 44px;
  background:rgba(236,245,255,.88);
  -webkit-backdrop-filter:blur(26px) saturate(1.4);backdrop-filter:blur(26px) saturate(1.4);
  opacity:0;visibility:hidden;transform:translateY(-10px);transition:all .3s ease;
}
.fn-drawer.open{opacity:1;visibility:visible;transform:translateY(0);}
.fn-drawer>a{font-size:1.12rem;font-weight:600;color:var(--ink);padding:11px 16px;border-radius:14px;}
.fn-drawer>a:hover{background:rgba(255,255,255,.6);}
.fn-drawer>a.active{color:var(--brand-deep);background:rgba(255,255,255,.78);}
.fn-drawer-cta{margin-top:6px;text-align:center;padding:11px 16px;border-radius:999px;border:1px solid rgba(255,255,255,.85);background:rgba(255,255,255,.6);color:var(--ink);font-weight:600;}
.fn-drawer-cta.primary{background:linear-gradient(135deg,#1e7bff,#0a54d0);color:#fff;border:0;}
@media (max-width:920px){
  .float-nav{padding:10px 12px 4px;}
  .fn-links,.fn-cta-ghost{display:none;}
  .fn-ctas{margin-left:auto;}
  .fn-burger{
    display:flex;flex-direction:column;justify-content:center;align-items:center;gap:4px;
    margin-left:8px;width:38px;height:38px;flex:none;border-radius:12px;border:0;
    background:rgba(255,255,255,.55);cursor:pointer;
  }
  .fn-burger span{width:16px;height:2px;border-radius:2px;background:var(--ink);transition:all .3s ease;}
  .fn-burger.open span:nth-child(1){transform:translateY(6px) rotate(45deg);}
  .fn-burger.open span:nth-child(2){opacity:0;}
  .fn-burger.open span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}
  .fn-pill{padding:7px 12px 7px 14px;}
}