/* =========================================================
   必博官方中文站 · 共享样式 /assets/site.css
   深色控制台底座 · 玻璃层与实色层并置 · 等宽索引
   ========================================================= */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --blue-deep:#081726;
  --blue-panel:#10243A;
  --cyan:#2FE0C8;
  --gold:#F2B84B;
  --violet:#6E6C93;
  --lime:#7BE38F;
  --coral:#FF8B7A;
  --text:#E9F2FB;
  --text-dim:#93A8C2;
  --line:#1E3A5A;

  --glass:rgba(16,36,58,.62);
  --glass-2:rgba(16,36,58,.86);

  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --wrap:1120px;
  --gutter:clamp(16px,4vw,32px);
  --radius:14px;
  --radius-sm:9px;
  --dur:.18s;
  --dur-slow:.22s;
}

/* ---------- 2. reset 与基础排版 ---------- */
*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%}

body{
  margin:0;
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.85;
  letter-spacing:.01em;
  background-color:var(--blue-deep);
  background-image:
    radial-gradient(900px 520px at 8% -10%, rgba(47,224,200,.10), transparent 62%),
    radial-gradient(760px 460px at 104% 2%, rgba(110,108,147,.16), transparent 64%),
    linear-gradient(180deg,#081726 0%,#071421 100%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

h1,h2,h3,h4{
  margin:0;
  font-family:var(--font-display);
  font-weight:800;
  font-stretch:87.5%;
  letter-spacing:-.015em;
  line-height:1.22;
  color:var(--text);
}
h1{font-size:clamp(30px,6vw,46px);line-height:1.1}
h2{font-size:clamp(24px,4.6vw,34px)}
h3{font-size:clamp(19px,3.4vw,24px)}
h4{font-size:17px}

p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,figure{margin:0;max-width:100%}
img{display:block}
table{border-collapse:collapse;width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}

[id]{scroll-margin-top:96px}

.mono{font-family:var(--font-mono);font-size:13px;letter-spacing:.02em}
.text-dim{color:var(--text-dim)}

@media (prefers-reduced-motion: no-preference){
  html{scroll-behavior:smooth}
}

/* ---------- 3. 页头 ---------- */
.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-70px;
  z-index:120;
  padding:10px 18px;
  border-radius:0 0 10px 10px;
  background:var(--cyan);
  color:#04222a;
  font-size:14px;
  font-weight:800;
  transition:top var(--dur) ease;
}
.skip-link:focus{top:0}

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(8,23,38,.93);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(16px) saturate(150%);
  -webkit-backdrop-filter:blur(16px) saturate(150%);
}
.site-header::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  opacity:.7;
  background-image:repeating-linear-gradient(135deg,rgba(47,224,200,.05) 0 1px,transparent 1px 9px);
}
.site-header::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:1px;
  pointer-events:none;
  background:linear-gradient(90deg,transparent,rgba(47,224,200,.45) 22%,rgba(242,184,75,.35) 78%,transparent);
}

.header-inner{
  position:relative;
  z-index:1;
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gutter);
}

.header-top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  min-height:64px;
  padding:9px 0;
}

.brand{display:flex;flex-direction:column;gap:1px;min-width:0}
.brand-name{
  position:relative;
  display:inline-block;
  padding-left:15px;
  font-family:var(--font-display);
  font-weight:800;
  font-stretch:87.5%;
  font-size:clamp(18px,2.6vw,22px);
  letter-spacing:-.01em;
  line-height:1.3;
  color:var(--text);
  transition:color var(--dur) ease;
}
.brand-name::before{
  content:"";
  position:absolute;
  left:0;
  top:.42em;
  width:7px;height:7px;
  border-radius:2px;
  background:var(--cyan);
  box-shadow:0 0 12px rgba(47,224,200,.85);
}
.brand:hover .brand-name{color:var(--cyan)}
.brand-tag{
  padding-left:15px;
  max-width:46ch;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
  font-family:var(--font-mono);
  font-size:11.5px;
  line-height:1.5;
  color:var(--text-dim);
}

.header-state{display:flex;align-items:center;gap:10px;flex-shrink:0}

.version-chip{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:6px 12px;
  border:1px solid var(--line);
  border-radius:999px;
  background:var(--glass);
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--text-dim);
  white-space:nowrap;
}
.version-chip b{font-weight:500;color:var(--cyan)}

.status-dot{
  position:relative;
  flex-shrink:0;
  width:7px;height:7px;
  border-radius:50%;
  background:var(--lime);
}
.status-dot::after{
  content:"";
  position:absolute;
  inset:-4px;
  border-radius:50%;
  border:1px solid rgba(123,227,143,.55);
  animation:breathe 2.4s ease-in-out infinite;
}
@keyframes breathe{
  0%,100%{transform:scale(.72);opacity:.9}
  50%{transform:scale(1.18);opacity:.12}
}

.header-cta{min-height:40px;padding:0 16px;font-size:13.5px}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:0 14px;
  border:1px solid var(--line);
  border-radius:999px;
  background:var(--glass);
  font-size:14px;
  font-weight:600;
  color:var(--text);
  transition:color var(--dur) ease,border-color var(--dur) ease;
}
.nav-toggle-bars{
  display:inline-flex;
  flex-direction:column;
  justify-content:center;
  gap:4px;
  width:16px;height:14px;
}
.nav-toggle-bars span{
  display:block;
  height:1.5px;
  border-radius:2px;
  background:var(--text);
  transition:transform var(--dur) ease,opacity var(--dur) ease,background var(--dur) ease;
}
.nav-toggle[aria-expanded="true"]{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span{background:var(--cyan)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

.site-nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:2px 0;
  border-top:1px solid rgba(30,58,90,.75);
}

.nav-list{display:flex;align-items:center;flex-wrap:wrap;gap:clamp(2px,1.2vw,10px)}

.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  min-height:48px;
  padding:0 13px;
  font-size:15px;
  font-weight:500;
  color:var(--text-dim);
  transition:color var(--dur) ease;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:13px;right:13px;bottom:8px;
  height:2px;
  border-radius:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur) ease,opacity var(--dur) ease;
}
.nav-link:hover,.nav-link:focus-visible{color:var(--text)}
.nav-link:hover::after{transform:scaleX(1);opacity:.55}
.nav-link[aria-current="page"]{color:var(--cyan);font-weight:600}
.nav-link[aria-current="page"]::after{
  transform:scaleX(1);
  opacity:1;
  box-shadow:0 0 10px rgba(47,224,200,.75);
}

.nav-meta{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--violet);
  white-space:nowrap;
}

.nav-drawer-status,.nav-quick{display:none}

@media (max-width:860px){
  .brand-tag{max-width:min(56vw,300px)}
  .header-cta,.nav-meta{display:none}
  .nav-toggle{display:inline-flex}

  .site-nav{
    display:block;
    padding:0;
    border-top:0;
    max-height:0;
    overflow:hidden;
    transition:max-height var(--dur-slow) ease;
  }
  .site-nav[data-open]{
    max-height:min(78vh,620px);
    overflow-y:auto;
    padding-bottom:14px;
    border-top:1px solid var(--line);
  }

  .nav-drawer-status{
    display:block;
    padding:18px 4px 14px;
    border-bottom:1px dashed rgba(30,58,90,.9);
  }
  .nav-drawer-line{display:flex;align-items:center;gap:9px;font-size:14.5px;color:var(--text)}
  .nav-drawer-note{margin-top:5px;color:var(--text-dim)}

  .nav-list{flex-direction:column;align-items:stretch;gap:0;padding:6px 0}
  .nav-link{
    min-height:52px;
    padding:0 6px;
    font-size:16.5px;
    border-bottom:1px solid rgba(30,58,90,.6);
  }
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{
    padding-left:16px;
    box-shadow:inset 3px 0 0 var(--cyan);
    border-bottom-color:rgba(47,224,200,.4);
  }

  .nav-quick{display:block;padding:16px 6px 4px}
  .nav-quick-title{
    margin-bottom:10px;
    font-family:var(--font-mono);
    font-size:11.5px;
    letter-spacing:.14em;
    color:var(--violet);
  }
  .nav-quick-list{display:flex;flex-wrap:wrap;gap:8px}
  .nav-quick-list a{
    display:inline-flex;
    align-items:center;
    min-height:40px;
    padding:0 14px;
    border:1px solid var(--line);
    border-radius:999px;
    background:var(--glass);
    font-size:14px;
    color:var(--text-dim);
    transition:color var(--dur) ease,border-color var(--dur) ease;
  }
  .nav-quick-list a:hover{color:var(--cyan);border-color:rgba(47,224,200,.5)}
}

/* ---------- 4. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,96px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(16,36,58,.42),rgba(8,23,38,.98) 55%);
}

.footer-inner{
  display:grid;
  gap:clamp(26px,4vw,40px);
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:clamp(34px,6vw,60px) var(--gutter) 26px;
}

.footer-top{
  display:grid;
  grid-template-columns:minmax(210px,1fr) 2.2fr;
  gap:clamp(22px,4vw,48px);
}

.footer-brand{display:grid;align-content:start;gap:8px;max-width:34ch}
.footer-brand-name{
  font-family:var(--font-display);
  font-weight:800;
  font-stretch:87.5%;
  font-size:18px;
  letter-spacing:-.01em;
  color:var(--text);
}
.footer-brand-tag{font-size:11.5px;letter-spacing:.02em;color:var(--cyan)}
.footer-brand-note{font-size:13.5px;line-height:1.8;color:var(--text-dim)}

.footer-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(16px,2.4vw,26px);
}
.footer-col-title{
  margin-bottom:10px;
  padding-bottom:9px;
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--text-dim);
}
.footer-links{display:grid;gap:2px}
.footer-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:38px;
  font-size:14px;
  color:var(--text-dim);
  transition:color var(--dur) ease,padding-left var(--dur) ease;
}
.footer-link::before{
  content:"";
  flex-shrink:0;
  width:5px;height:5px;
  border-radius:1px;
  background:var(--line);
  transition:background var(--dur) ease;
}
.footer-link:hover,.footer-link:focus-visible{color:var(--cyan);padding-left:2px}
.footer-link:hover::before,.footer-link:focus-visible::before{background:var(--cyan)}

.contact-card{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:18px 26px;
  padding:clamp(18px,3vw,26px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--glass);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.contact-label{
  margin-bottom:5px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--violet);
}
.contact-value{font-size:14.5px;line-height:1.7;color:var(--text);overflow-wrap:anywhere}
.contact-note{
  grid-column:1 / -1;
  padding-top:14px;
  border-top:1px dashed rgba(30,58,90,.9);
  font-size:13px;
  line-height:1.8;
  color:var(--text-dim);
}

.legal-line{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px 22px;
  padding-top:20px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--text-dim);
}
.legal-closing{margin-left:auto}

.sitemap-band{
  border-top:1px solid var(--line);
  background:rgba(4,13,22,.85);
}
.sitemap-inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px 16px;
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:13px var(--gutter);
  font-family:var(--font-mono);
  font-size:11.5px;
  color:var(--text-dim);
}
.sitemap-label{
  display:inline-flex;
  align-items:center;
  gap:7px;
  color:var(--cyan);
  letter-spacing:.12em;
}
.sitemap-label::before{
  content:"";
  width:6px;height:6px;
  border-radius:1px;
  background:var(--cyan);
}
.sitemap-list{display:flex;flex-wrap:wrap;gap:6px 16px}
.sitemap-route{
  border-bottom:1px solid transparent;
  color:var(--text-dim);
  transition:color var(--dur) ease,border-color var(--dur) ease;
}
.sitemap-route:hover,.sitemap-route:focus-visible{color:var(--cyan);border-bottom-color:rgba(47,224,200,.6)}
.sitemap-version{margin-left:auto;color:var(--gold)}

@media (max-width:960px){
  .footer-top{grid-template-columns:1fr}
  .footer-brand{max-width:none}
  .contact-card{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:620px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .contact-card{grid-template-columns:1fr}
  .legal-closing{margin-left:0}
  .sitemap-version{margin-left:0}
}
@media (max-width:400px){
  .footer-grid{grid-template-columns:1fr}
}

/* ---------- 5. 版心与正文容器 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gutter);
}
.content-shell{
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:clamp(26px,4.6vw,54px) var(--gutter);
}

.prose{max-width:72ch}
.prose p{font-size:16px;line-height:1.85;color:var(--text)}
.prose p + p{margin-top:1.2em}
.prose h2{margin-top:1.7em;margin-bottom:.6em}
.prose h3{margin-top:1.4em;margin-bottom:.5em}
.prose ul{margin:1.1em 0}
.prose li{
  position:relative;
  margin-bottom:.5em;
  padding-left:18px;
  line-height:1.8;
  color:var(--text-dim);
}
.prose li::before{
  content:"";
  position:absolute;
  left:0;
  top:.78em;
  width:6px;height:6px;
  border-radius:1px;
  background:var(--cyan);
  opacity:.75;
}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(47,224,200,.4)}
.prose strong{color:var(--text);font-weight:600}

/* ---------- 6. 编号章节头 ---------- */
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:10px 16px;
  margin-bottom:18px;
}
.section-index{
  display:inline-flex;
  align-items:center;
  padding:3px 9px;
  border:1px solid rgba(47,224,200,.35);
  border-radius:999px;
  background:rgba(47,224,200,.07);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--cyan);
}
.section-title{
  font-family:var(--font-display);
  font-weight:800;
  font-stretch:87.5%;
  font-size:clamp(21px,3.6vw,28px);
  letter-spacing:-.015em;
  line-height:1.25;
  color:var(--text);
}
.section-note{font-size:13.5px;line-height:1.7;color:var(--text-dim)}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:0 18px;
  border:1px solid transparent;
  border-radius:999px;
  font-size:14.5px;
  font-weight:600;
  white-space:nowrap;
  transition:background var(--dur) ease,color var(--dur) ease,border-color var(--dur) ease;
}
.btn--cyan{background:var(--cyan);border-color:var(--cyan);color:#04222a}
.btn--cyan:hover,.btn--cyan:focus-visible{background:#5CF0DC;border-color:#5CF0DC}
.btn--gold{
  background:rgba(242,184,75,.10);
  border-color:rgba(242,184,75,.45);
  color:var(--gold);
}
.btn--gold:hover,.btn--gold:focus-visible{background:rgba(242,184,75,.2);border-color:var(--gold)}
.btn--ghost{background:var(--glass);border-color:var(--line);color:var(--text)}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--cyan);color:var(--cyan)}

/* ---------- 8. 状态徽标 ---------- */
.badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(16,36,58,.7);
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.6;
  color:var(--text-dim);
}
.badge--cyan{color:var(--cyan);border-color:rgba(47,224,200,.4);background:rgba(47,224,200,.08)}
.badge--gold{color:var(--gold);border-color:rgba(242,184,75,.4);background:rgba(242,184,75,.1)}
.badge--violet{color:#A9A7C8;border-color:rgba(110,108,147,.5);background:rgba(110,108,147,.16)}
.badge--lime{color:var(--lime);border-color:rgba(123,227,143,.4);background:rgba(123,227,143,.1)}
.badge--alert{color:var(--coral);border-color:rgba(255,139,122,.45);background:rgba(255,139,122,.1)}

/* ---------- 9. 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin-bottom:18px;
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--text-dim);
}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:var(--line)}
.breadcrumb a{color:var(--text-dim);transition:color var(--dur) ease}
.breadcrumb a:hover,.breadcrumb a:focus-visible{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--cyan)}

/* ---------- 10. 网格与卡片 ---------- */
.grid{display:grid;gap:clamp(14px,2.4vw,22px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

@media (max-width:960px){
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:720px){
  .grid--2,.grid--3{grid-template-columns:1fr}
}
@media (max-width:540px){
  .grid--4{grid-template-columns:1fr}
}

.card{
  position:relative;
  padding:clamp(16px,2.4vw,22px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(158deg,rgba(16,36,58,.94),rgba(8,23,38,.88));
}
.card--glass{
  border-color:rgba(30,58,90,.85);
  background:var(--glass);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}

/* ---------- 11. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius);
  aspect-ratio:16 / 10;
  background-image:
    repeating-linear-gradient(135deg,rgba(47,224,200,.07) 0 1px,transparent 1px 10px),
    linear-gradient(160deg,rgba(16,36,58,.95),rgba(8,23,38,.95));
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame--portrait{aspect-ratio:9 / 16}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame__tag{
  position:absolute;
  left:12px;top:12px;
  z-index:2;
  display:inline-flex;
  align-items:center;
  padding:4px 10px;
  border:1px solid rgba(47,224,200,.35);
  border-radius:999px;
  background:rgba(8,23,38,.78);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--cyan);
}
.media-frame__caption{margin-top:9px;font-size:13px;line-height:1.7;color:var(--text-dim)}
.media-grid{
  display:grid;
  gap:clamp(12px,2vw,20px);
  grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
}

/* ---------- 12. 标签页 ---------- */
.tabs{position:relative}
.tablist{
  display:flex;
  gap:4px;
  overflow-x:auto;
  border-bottom:1px solid var(--line);
}
.tab{
  position:relative;
  flex:none;
  min-height:46px;
  margin-bottom:-1px;
  padding:0 16px;
  border-bottom:2px solid transparent;
  font-size:14.5px;
  font-weight:500;
  color:var(--text-dim);
  white-space:nowrap;
  transition:color var(--dur) ease,border-color var(--dur) ease;
}
.tab:hover,.tab:focus-visible{color:var(--text)}
.tab[aria-selected="true"]{
  color:var(--cyan);
  font-weight:600;
  border-bottom-color:var(--cyan);
}
.tabpanel{padding-top:22px}
.tabpanel[hidden]{display:none}
@keyframes panelIn{
  from{opacity:0;transform:translateX(10px)}
  to{opacity:1;transform:none}
}
@media (prefers-reduced-motion: no-preference){
  .tabpanel:not([hidden]){animation:panelIn var(--dur) ease both}
}

/* ---------- 13. 折叠目录 ---------- */
.accordion{display:grid;gap:10px}
.accordion-item{
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  background:rgba(16,36,58,.5);
}
.accordion-trigger{
  display:flex;
  width:100%;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  min-height:54px;
  padding:0 16px;
  font-size:15.5px;
  font-weight:600;
  text-align:left;
  color:var(--text);
  transition:color var(--dur) ease,background var(--dur) ease;
}
.accordion-trigger:hover,.accordion-trigger:focus-visible{
  color:var(--cyan);
  background:rgba(47,224,200,.06);
}
.accordion-icon{position:relative;flex:none;width:14px;height:14px}
.accordion-icon::before,.accordion-icon::after{
  content:"";
  position:absolute;
  left:0;top:50%;
  width:14px;height:1.5px;
  border-radius:2px;
  background:var(--cyan);
  transition:transform var(--dur) ease;
}
.accordion-icon::after{transform:rotate(90deg)}
.accordion-trigger[aria-expanded="true"] .accordion-icon::after{transform:rotate(0)}
.accordion-panel{
  display:grid;
  grid-template-rows:0fr;
  transition:grid-template-rows var(--dur-slow) ease;
}
.accordion-panel[data-open]{grid-template-rows:1fr}
.accordion-panel-inner{overflow:hidden;min-height:0}
.accordion-body{
  padding:0 16px 18px;
  font-size:15px;
  line-height:1.8;
  color:var(--text-dim);
}

/* ---------- 14. 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
}