/* ==========================================================================
   华体汇移动端 — 共享样式（/assets/site.css）
   夜间索引站：深墨蓝基座 + 电光青骨架 + 暖橙行动点 + 纸白叠层
   ========================================================================== */

:root{
  --ink-900:#0A1428;
  --ink-800:#0F1F3D;
  --ink-700:#16294F;
  --ink-600:#1F3A6B;
  --cyan-500:#00E5D4;
  --cyan-300:#7FF6EC;
  --orange-500:#FF8A3D;
  --orange-300:#FFC46B;
  --white-100:#E9F2FF;
  --mist-300:#A8BBD9;
  --paper-200:#F4F7FC;

  --font-head:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,monospace;

  --shell-max:1240px;
  --gutter:20px;
  --gap:24px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --line:1px solid var(--ink-600);
  --radius:16px;
  --radius-sm:12px;
  --radius-pill:999px;
  --shadow-lift:0 24px 48px rgba(4,10,22,.5);
}
@media (min-width:768px){:root{--gutter:40px}}
@media (min-width:1200px){:root{--gutter:64px}}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink-900);
  color:var(--white-100);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg,video{max-width:100%;display:block}
button,input,select,textarea{font:inherit;color:inherit}
a{color:var(--cyan-300);text-decoration-color:rgba(127,246,236,.4);text-underline-offset:3px}
ul,ol{margin:0;padding:0}
p{margin:0 0 1em}
h1,h2,h3,h4,h5{margin:0;font-family:var(--font-head);color:var(--white-100);line-height:1.25}
h1,.h1{font-size:clamp(32px,4.4vw,56px);line-height:1.15;font-weight:750;letter-spacing:-.01em}
h2,.h2{font-size:clamp(24px,2.6vw,36px);line-height:1.25;font-weight:700}
h3,.h3{font-size:20px;line-height:1.4;font-weight:650}
hr{border:0}
kbd{
  font-family:var(--font-mono);font-size:12px;line-height:1;
  padding:3px 6px;border-radius:5px;background:#fff;
  border:1px solid rgba(10,20,40,.28);color:var(--ink-900);
}
:focus-visible{outline:2px solid var(--cyan-500);outline-offset:3px;border-radius:4px}

/* ---------- 无障碍 ---------- */
.skip-link{
  position:absolute;left:16px;top:-90px;z-index:200;
  padding:10px 18px;border-radius:0 0 12px 12px;
  background:var(--cyan-500);color:var(--ink-900);
  font-family:var(--font-head);font-weight:650;font-size:14px;text-decoration:none;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:0}
.visually-hidden{
  position:absolute!important;width:1px;height:1px;overflow:hidden;
  clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;
}

/* ---------- 布局容器 ---------- */
.shell{width:100%;max-width:var(--shell-max);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(48px,7vw,96px)}
.section--narrow{padding-block:clamp(30px,4vw,56px)}
.section--tint{background:var(--ink-800);border-block:1px solid rgba(31,58,107,.75)}
.container-narrow{max-width:820px;margin-inline:auto}
.content-block{max-width:44em}
.stack{display:grid;gap:var(--stack-gap,20px)}
.stack--sm{--stack-gap:12px}
.stack--lg{--stack-gap:32px}
.grid-cards{display:grid;gap:18px;grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}
.rule{height:1px;background:var(--ink-600);border:0;margin:0}
.flowline{
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(0,229,212,.55),rgba(255,138,61,.4),transparent);
}

/* 左右分屏系统 */
.split{display:grid;gap:28px;grid-template-columns:1fr;align-items:start}
.split__aside{min-width:0}
.split__main{min-width:0}
@media (min-width:1024px){
  .split{grid-template-columns:minmax(0,4fr) minmax(0,8fr);gap:48px}
  .split--5-7{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
  .split--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
  .split__aside{position:sticky;top:104px}
}
@media (max-width:1023px){
  .split__aside{position:static}
}

/* ---------- 排版元素 ---------- */
.display{
  font-family:var(--font-head);
  font-size:clamp(44px,7vw,96px);
  line-height:1.05;
  font-weight:800;
  letter-spacing:-.02em;
  color:var(--white-100);
}
.lead{font-size:clamp(18px,1.5vw,22px);line-height:1.6;color:#C9D8F2;max-width:36em}
.note{font-size:14px;line-height:1.65;color:var(--mist-300)}
.mono-label{
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.2;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--cyan-500);
}
.mono-key{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.04em;
  color:var(--white-100);
}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--cyan-500);
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--cyan-500);flex:none}
.section-head{
  display:flex;flex-wrap:wrap;gap:14px 24px;
  align-items:flex-end;justify-content:space-between;
  margin-bottom:clamp(22px,3vw,40px);
}
.section-head__text{max-width:42em}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border-radius:var(--radius-pill);
  border:1px solid transparent;background:var(--ink-700);
  font-family:var(--font-head);font-size:14.5px;font-weight:650;letter-spacing:.01em;
  color:var(--white-100);text-decoration:none;cursor:pointer;
  transition:transform .2s var(--ease),background-color .2s var(--ease),
             color .2s var(--ease),border-color .2s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--accent{background:var(--orange-500);color:var(--ink-900)}
.btn--accent:hover{background:var(--orange-300)}
.btn--cyan{background:var(--cyan-500);color:var(--ink-900)}
.btn--cyan:hover{background:var(--cyan-300)}
.btn--ghost{background:transparent;color:var(--white-100);border-color:var(--ink-600)}
.btn--ghost:hover{border-color:var(--cyan-500);color:var(--cyan-300)}
.btn--paper{background:var(--paper-200);color:var(--ink-900);border-color:transparent}
.btn--paper:hover{background:#fff}
.btn--sm{padding:8px 15px;font-size:13.5px}

/* ---------- 标签 / 卡片 / 叠层 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border-radius:var(--radius-pill);
  border:1px solid var(--ink-600);background:rgba(22,41,79,.6);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--mist-300);white-space:nowrap;
}
.tag--cyan{border-color:rgba(0,229,212,.5);background:rgba(0,229,212,.1);color:var(--cyan-300)}
.tag--orange{border-color:rgba(255,138,61,.5);background:rgba(255,138,61,.12);color:var(--orange-300)}

.frame{
  border:var(--line);border-radius:var(--radius);
  background:var(--ink-700);padding:clamp(18px,2.4vw,28px);
}
.frame--flat{background:transparent}
.frame--paper{background:var(--paper-200);color:var(--ink-900);border-color:rgba(10,20,40,.14)}
.frame--paper .mono-label{color:var(--ink-700)}
.frame--paper h2,.frame--paper h3{color:var(--ink-900)}
.plate{
  position:relative;background:var(--paper-200);color:var(--ink-900);
  border:1px solid rgba(10,20,40,.16);border-radius:var(--radius-sm);
  padding:20px;box-shadow:7px 7px 0 rgba(0,229,212,.16);
}
.card{
  position:relative;display:grid;gap:10px;min-width:0;
  border:var(--line);background:var(--ink-700);border-radius:var(--radius);
  padding:20px;
  transition:transform .25s var(--ease),border-color .25s var(--ease),background-color .25s var(--ease);
}
.card:hover{transform:translateY(-4px);border-color:var(--cyan-500);background:var(--ink-800)}
.card__key{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--cyan-500)}
.card__title{font-family:var(--font-head);font-size:18px;font-weight:650;color:var(--white-100);margin:0}
.card__meta{font-size:14px;line-height:1.7;color:var(--mist-300);margin:0}
.list-plain{list-style:none;margin:0;padding:0}

/* ---------- 时间轴 ---------- */
.timeline{list-style:none;margin:0;padding:0 0 0 2px;display:grid;gap:22px;border-left:1px solid var(--ink-600)}
.timeline__item{position:relative;padding-left:22px}
.timeline__item::before{
  content:"";position:absolute;left:-5px;top:9px;width:9px;height:9px;
  border-radius:50%;background:var(--ink-900);border:2px solid var(--cyan-500);
}
.timeline__item--now::before{background:var(--orange-500);border-color:var(--orange-500)}
.timeline__key{display:block;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--cyan-500)}
.timeline__body{margin-top:6px;font-size:15px;line-height:1.7;color:var(--mist-300)}
.timeline__body strong{color:var(--white-100)}

/* ---------- 折叠详情 ---------- */
[data-disclosure]{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  width:100%;text-align:left;cursor:pointer;
  background:var(--ink-800);border:var(--line);border-radius:var(--radius-sm);
  padding:14px 16px;color:var(--white-100);
  font-family:var(--font-head);font-size:15.5px;font-weight:650;
  transition:border-color .2s var(--ease),background-color .2s var(--ease);
}
[data-disclosure]:hover{border-color:var(--cyan-500)}
[data-disclosure]::after{
  content:"+";font-family:var(--font-mono);font-size:18px;line-height:1;
  color:var(--cyan-500);flex:none;transition:transform .25s var(--ease);
}
[data-disclosure].is-open::after{content:"−";transform:rotate(180deg)}
[data-disclosure-panel]{
  border:var(--line);border-top:0;border-radius:0 0 var(--radius-sm) var(--radius-sm);
  padding:16px;background:rgba(15,31,61,.7);
}

/* ---------- 图片容器 ---------- */
.media{
  position:relative;overflow:hidden;isolate:isolate;
  border:var(--line);border-radius:var(--radius);
  background:linear-gradient(150deg,var(--ink-800),var(--ink-900));
  aspect-ratio:16/10;
}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media__img{
  width:100%;height:100%;object-fit:cover;
  filter:saturate(.92) contrast(1.06);
}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(10,20,40,.06),rgba(10,20,40,.58));
}
.media__caption{
  position:absolute;left:16px;right:16px;bottom:14px;z-index:2;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  color:var(--cyan-300);
}
.media-placeholder{
  position:absolute;inset:0;display:grid;place-items:center;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  color:rgba(168,187,217,.65);text-transform:uppercase;
}
.media__grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}

/* ---------- 面包屑 / 正文 ---------- */
.breadcrumbs{
  padding-block:14px;border-bottom:1px solid rgba(31,58,107,.65);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--mist-300);
}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:0;list-style:none;margin:0;padding:0}
.breadcrumbs li{display:inline-flex;align-items:center}
.breadcrumbs li:not(:last-child)::after{content:"/";margin:0 9px;color:var(--ink-600)}
.breadcrumbs a{color:var(--mist-300);text-decoration:none}
.breadcrumbs a:hover{color:var(--cyan-300)}
.breadcrumbs [aria-current="page"]{color:var(--white-100)}

.prose{max-width:38em}
.prose p{color:#CDDBF3}
.prose h2{margin:1.9em 0 .55em}
.prose h3{margin:1.5em 0 .45em}
.prose ul,.prose ol{margin:0 0 1.2em 1.15em;padding:0}
.prose li{margin-bottom:.5em;color:#CDDBF3}
.prose li::marker{color:var(--cyan-500)}
.prose a{color:var(--cyan-300)}
.prose strong{color:var(--white-100)}

/* ---------- 显现动画 ---------- */
[data-reveal]{opacity:1;transform:none}
html.js [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
html.js [data-reveal].is-in{opacity:1;transform:none}

/* ==========================================================================
   悬浮胶囊头部
   ========================================================================== */
.site-header{
  position:sticky;top:0;z-index:80;
  background:linear-gradient(180deg,rgba(10,20,40,.96),rgba(10,20,40,.82));
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(31,58,107,.55);
  transition:background-color .3s var(--ease),border-color .3s var(--ease);
}
.nav-shell{
  position:relative;
  display:flex;align-items:center;gap:14px;
  min-height:74px;padding-block:10px;
  transition:min-height .28s var(--ease),padding .28s var(--ease);
}
.site-header[data-condensed]{
  background:linear-gradient(180deg,rgba(10,20,40,.99),rgba(15,31,61,.94));
  border-bottom-color:rgba(31,58,107,.9);
}
.site-header[data-condensed] .nav-shell{min-height:60px;padding-block:7px}
.site-header[data-condensed] .brand-line{opacity:0;visibility:hidden}
.site-header[data-condensed] .nav-link{padding:7px 12px;font-size:13.5px}

/* 品牌标记 */
.brand{
  display:flex;align-items:center;gap:12px;flex:0 0 auto;
  color:var(--white-100);text-decoration:none;
}
.brand-mark{
  position:relative;flex:none;width:38px;height:38px;
  border:1px solid var(--ink-600);border-radius:11px;background:var(--ink-700);
  display:grid;place-items:center;
}
.brand-mark::before{
  content:"";width:17px;height:17px;border-radius:50%;
  border:2px solid var(--cyan-500);border-right-color:transparent;border-bottom-color:var(--orange-500);
  transition:transform .5s var(--ease);
}
.brand:hover .brand-mark::before{transform:rotate(120deg)}
.brand-text{display:flex;flex-direction:column;gap:2px;line-height:1.15;min-width:0}
.brand-name{font-family:var(--font-head);font-size:17px;font-weight:750;letter-spacing:.01em}
.brand-line{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.07em;color:var(--mist-300);
  transition:opacity .25s var(--ease),visibility .25s var(--ease);
}

/* 栏目浮岛 */
.nav-capsule{flex:1 1 auto;display:flex;justify-content:center;min-width:0}
.nav-list{
  display:flex;align-items:center;gap:3px;list-style:none;margin:0;padding:5px;
  border:1px solid rgba(31,58,107,.95);border-radius:var(--radius-pill);
  background:rgba(22,41,79,.6);
}
.nav-link{
  display:block;padding:8px 13px;border-radius:var(--radius-pill);
  font-size:13.5px;line-height:1.2;color:var(--mist-300);text-decoration:none;white-space:nowrap;
  transition:color .2s var(--ease),background-color .2s var(--ease),box-shadow .2s var(--ease);
}
.nav-link:hover{color:var(--cyan-300);background:rgba(0,229,212,.1)}
.nav-link.is-active{color:var(--cyan-300);box-shadow:inset 0 0 0 1px rgba(0,229,212,.45)}
.nav-link[aria-current="page"]{
  background:var(--cyan-500);color:var(--ink-900);font-weight:650;
  box-shadow:none;
}
.nav-link[aria-current="page"]:hover{background:var(--cyan-300);color:var(--ink-900)}

/* 右侧动作区 */
.header-actions{display:flex;align-items:center;gap:9px;flex:0 0 auto;margin-left:auto}
.icon-btn{
  display:inline-flex;align-items:center;gap:7px;height:38px;padding:0 13px;
  border:1px solid var(--ink-600);border-radius:var(--radius-pill);
  background:transparent;color:var(--mist-300);font-size:13px;cursor:pointer;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.icon-btn:hover{color:var(--cyan-300);border-color:var(--cyan-500)}
.icon-btn[aria-expanded="true"]{background:var(--orange-300);border-color:var(--orange-300);color:var(--ink-900)}
.icon-btn__glyph{font-size:14px;line-height:1}
.icon-btn__label{font-family:var(--font-head);font-weight:650}

.nav-toggle{
  display:none;align-items:center;gap:9px;height:38px;padding:0 14px;
  border:1px solid var(--ink-600);border-radius:var(--radius-pill);
  background:var(--ink-700);color:var(--white-100);font-size:13px;cursor:pointer;
}
.nav-toggle:hover{border-color:var(--cyan-500)}
.nav-toggle__bars{display:grid;gap:4px}
.nav-toggle__bars i{
  display:block;width:15px;height:1.5px;background:currentColor;
  transition:transform .25s var(--ease);
}
.nav-toggle__text{font-family:var(--font-head);font-weight:650}
.site-header[data-open] .nav-toggle{border-color:var(--cyan-500);color:var(--cyan-300)}
.site-header[data-open] .nav-toggle__bars i:first-child{transform:translateY(2.75px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars i:last-child{transform:translateY(-2.75px) rotate(-45deg)}

/* 收藏提示浮层 */
.bookmark-tip{
  position:absolute;top:calc(100% + 10px);right:var(--gutter);z-index:6;
  width:min(340px,calc(100% - var(--gutter) * 2));
  background:var(--paper-200);color:var(--ink-900);
  border:1px solid rgba(10,20,40,.18);border-radius:14px;
  padding:16px 18px;box-shadow:var(--shadow-lift);
}
.bookmark-tip[hidden]{display:none}
.bookmark-tip .mono-label{color:var(--ink-700)}
.bookmark-tip p{margin:8px 0 0;font-size:13.5px;line-height:1.7;color:var(--ink-800)}

/* 阅读进度 */
.read-progress{position:absolute;left:0;right:0;bottom:0;height:2px;overflow:hidden}
.read-progress__bar{
  display:block;width:0;height:100%;
  background:linear-gradient(90deg,var(--cyan-500),var(--orange-500));
  transition:width .12s linear;
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer{
  background:var(--ink-800);
  border-top:1px solid var(--ink-600);
  padding-top:clamp(44px,5vw,64px);
}
.footer-grid{
  display:grid;gap:34px;grid-template-columns:1fr;
  padding-bottom:clamp(34px,4vw,52px);
}
@media (min-width:640px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}
@media (min-width:1024px){
  .footer-grid{grid-template-columns:1.5fr 1fr 1.1fr 1.3fr;gap:32px}
  .footer-brand{grid-column:auto}
}
.footer-brand .brand{margin-bottom:16px}
.footer-pitch{
  margin:0 0 20px;max-width:36ch;
  font-size:15px;line-height:1.75;color:var(--mist-300);
}
.footer-paths{display:flex;flex-wrap:wrap;gap:10px}
.footer-col{min-width:0}
.footer-title{margin:0 0 16px;font-weight:400}
.footer-list,.footer-index,.contact-list{list-style:none;margin:0;padding:0}
.footer-list{display:grid;gap:10px}
.footer-list a{font-size:14.5px;color:var(--mist-300);text-decoration:none}
.footer-list a:hover{color:var(--cyan-300)}
.footer-index{display:grid;gap:11px}
.footer-index li{display:flex;align-items:baseline;gap:10px;font-size:14px;color:var(--mist-300)}
.footer-index .mono-key{color:var(--cyan-300);min-width:3.4em}
.index-text{min-width:0}
.contact-list{display:grid;gap:14px}
.contact-list li{display:grid;gap:5px;min-width:0}
.contact-key{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--cyan-500);
}
.contact-row{display:flex;align-items:center;gap:9px;flex-wrap:wrap}
.contact-val{font-size:14.5px;color:var(--white-100);word-break:break-word}
.contact-note{font-size:13.5px;line-height:1.7;color:var(--mist-300)}
.copy-btn{
  flex:none;padding:4px 10px;border-radius:var(--radius-pill);
  border:1px solid var(--ink-600);background:transparent;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:var(--mist-300);cursor:pointer;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.copy-btn:hover{color:var(--cyan-300);border-color:var(--cyan-500)}
.copy-btn.is-done{background:var(--cyan-500);border-color:var(--cyan-500);color:var(--ink-900)}

.footer-legal{
  display:flex;flex-wrap:wrap;gap:12px 26px;align-items:center;justify-content:space-between;
  border-top:1px solid rgba(31,58,107,.8);
  padding-block:20px 26px;
  font-size:13px;color:var(--mist-300);
}
.legal-copy{margin:0}
.legal-copy .mono-key{color:var(--mist-300);font-size:12.5px}
.legal-links{display:flex;flex-wrap:wrap;gap:8px 22px;list-style:none;margin:0;padding:0}
.legal-links a{color:var(--mist-300);text-decoration:none;font-size:13px}
.legal-links a:hover{color:var(--cyan-300)}

/* 移动端底部快捷条 */
.quickbar{display:none}
@media (max-width:1024px){
  .quickbar{
    display:flex;position:fixed;left:12px;right:12px;bottom:12px;z-index:70;gap:8px;
    padding:6px;border:1px solid var(--ink-600);border-radius:var(--radius-pill);
    background:rgba(15,31,61,.95);
    -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
    box-shadow:0 18px 34px rgba(4,10,22,.55);
  }
  .quickbar__link{
    flex:1;text-align:center;padding:11px 8px;border-radius:var(--radius-pill);
    font-family:var(--font-head);font-size:14px;font-weight:650;text-decoration:none;
    background:var(--ink-700);color:var(--white-100);
  }
  .quickbar__link--accent{background:var(--orange-500);color:var(--ink-900)}
  .footer-legal{padding-bottom:84px}
}

/* ==========================================================================
   平板 / 手机：胶囊折叠为浮岛列表
   ========================================================================== */
@media (max-width:1024px){
  .brand-line{display:none}
  .nav-toggle{display:inline-flex}
  .nav-capsule{
    position:absolute;left:0;right:0;top:100%;
    display:block;flex:none;padding-inline:var(--gutter);
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s var(--ease);
  }
  .site-header[data-open] .nav-capsule{opacity:1;visibility:visible;transform:translateY(0)}
  .nav-list{
    flex-direction:column;align-items:stretch;gap:2px;
    padding:10px;border-radius:18px;background:var(--ink-800);
    border-color:var(--ink-600);box-shadow:var(--shadow-lift);
  }
  .nav-link{padding:13px 14px;border-radius:var(--radius-sm);font-size:15.5px}
  .nav-link.is-active{box-shadow:none;color:var(--mist-300)}
  .nav-link[aria-current="page"]{
    background:rgba(0,229,212,.14);color:var(--cyan-300);
    box-shadow:inset 3px 0 0 var(--cyan-500);
  }
  .nav-link[aria-current="page"]:hover{background:rgba(0,229,212,.2);color:var(--cyan-300)}
}

@media (max-width:640px){
  :root{--gap:18px}
  body{font-size:16px}
  .nav-shell{min-height:66px;gap:10px}
  .brand-mark{width:34px;height:34px;border-radius:10px}
  .brand-mark::before{width:15px;height:15px}
  .brand-name{font-size:15.5px}
  .icon-btn__label{display:none}
  .icon-btn{padding:0 11px}
  .header-cta{padding:8px 13px;font-size:13px}
  .nav-toggle{padding:0 12px}
  .bookmark-tip{right:var(--gutter);left:var(--gutter);width:auto}
}

/* ==========================================================================
   动效降级
   ========================================================================== */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  html.js [data-reveal]{opacity:1;transform:none;transition:none}
  .btn:hover,.card:hover{transform:none}
  .read-progress__bar{transition:none}
}