/* ============================================================
   利来体育看台 · /assets/site.css
   共享外壳：框架式页头 / 看台页脚 / 通用排版 / 基础组件
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root{
  --deep-900:#05182E;
  --stand-800:#0B2A4A;
  --venue-700:#14406E;
  --track-500:#2E6FA8;
  --orange-500:#FF7A1A;
  --orange-300:#FFB25C;
  --cyan-400:#12C2A0;
  --paper-050:#F4F7FB;
  --gray-300:#C9D6E4;
  --ink-900:#1A2430;

  --font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --top-h:64px;
  --rail-w:0px;
  --container:1240px;
  --cut-sm:14px;
  --cut-lg:28px;
  --ease:cubic-bezier(.22,.61,.36,1);

  --line:rgba(201,214,228,.16);
  --line-strong:rgba(201,214,228,.32);
  --muted:rgba(201,214,228,.82);
  --link:var(--orange-300);
}

@media (min-width:1080px){
  :root{--top-h:68px;--rail-w:96px}
}

/* ---------- 2. reset ---------- */
*,
*::before,
*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--top-h) + 18px);
}

body{
  margin:0;
  padding-top:var(--top-h);
  padding-left:var(--rail-w);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  color:var(--paper-050);
  background-color:var(--deep-900);
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
img,svg,video{display:block;max-width:100%}
table{border-collapse:collapse;width:100%}

::selection{background:var(--orange-500);color:var(--deep-900)}

:focus-visible{
  outline:2px solid var(--orange-300);
  outline-offset:3px;
}

/* ---------- 3. 中文排版基线 ---------- */
h1{
  font-family:var(--font-serif);
  font-size:clamp(28px,4.2vw,48px);
  font-weight:700;
  line-height:1.2;
  letter-spacing:-.01em;
}
h2{
  font-family:var(--font-serif);
  font-size:clamp(23px,3vw,36px);
  font-weight:700;
  line-height:1.25;
  letter-spacing:-.01em;
}
h3{
  font-family:var(--font-sans);
  font-size:clamp(17px,1.8vw,21px);
  font-weight:700;
  line-height:1.4;
}
h4{
  font-family:var(--font-sans);
  font-size:15px;
  font-weight:700;
  line-height:1.5;
}
p{font-size:16px;line-height:1.75}
strong{font-weight:700;color:var(--paper-050)}

.impact-title{
  font-family:var(--font-sans);
  font-weight:900;
  font-size:clamp(34px,6vw,72px);
  line-height:1.05;
  letter-spacing:-.02em;
}
.serif-title{
  font-family:var(--font-serif);
  font-weight:700;
  font-size:clamp(25px,3.4vw,44px);
  line-height:1.2;
  letter-spacing:-.01em;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:12px;
  font-weight:600;
  letter-spacing:.2em;
  line-height:1.4;
  color:var(--orange-300);
}
.eyebrow::before{
  content:"";
  width:22px;
  height:2px;
  background:currentColor;
}
.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  white-space:nowrap;
  border:0;
}

/* ---------- 4. 布局骨架 ---------- */
.container{
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding-inline:clamp(18px,4.5vw,44px);
}
.section{padding-block:clamp(48px,7vw,96px)}
.section--tight{padding-block:clamp(28px,4vw,56px)}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(268px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(212px,1fr))}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}

@media (max-width:900px){
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
}
@media (max-width:600px){
  .grid--12{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* 近白阅读区：内部变量整体翻转，band / panel / 链接自动适配 */
.surface-paper{
  background-color:var(--paper-050);
  color:var(--ink-900);
  --line:rgba(26,36,48,.14);
  --line-strong:rgba(26,36,48,.3);
  --gray-300:#41556B;
  --paper-050:#0B2A4A;
  --muted:#3A4A5C;
  --link:var(--venue-700);
}

/* ---------- 5. 按钮与链接 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:0 20px;
  font-family:var(--font-sans);
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
  line-height:1;
  color:var(--paper-050);
  background:transparent;
  border:1px solid transparent;
  white-space:nowrap;
  transition:background-color .18s var(--ease),color .18s var(--ease),
             border-color .18s var(--ease),transform .18s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--primary{
  background-color:var(--orange-500);
  color:var(--deep-900);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%);
}
.btn--primary:hover{background-color:var(--orange-300)}
.btn--ghost{
  border-color:var(--line-strong);
  color:var(--gray-300);
}
.btn--ghost:hover{
  border-color:var(--orange-500);
  color:var(--paper-050);
  background-color:rgba(46,111,168,.25);
}
.btn--quiet{
  min-height:36px;
  padding:0 2px;
  border-bottom:2px solid var(--orange-500);
  color:var(--paper-050);
}
.btn--quiet:hover{color:var(--orange-300)}

.link-inline{
  color:var(--link);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
}
.link-inline:hover{text-decoration-thickness:2px}

/* ---------- 6. 框架式页头 ---------- */
.site-frame{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:80;
}

.skip-link{
  position:fixed;
  top:-120px;
  left:16px;
  z-index:200;
  padding:13px 20px;
  font-size:13px;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--deep-900);
  background-color:var(--orange-500);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:12px}

/* 顶部横梁 */
.frame-top{
  position:relative;
  display:flex;
  align-items:center;
  gap:16px;
  height:var(--top-h);
  padding:0 clamp(12px,2.4vw,26px);
  background-color:rgba(5,24,46,.97);
  border-bottom:1px solid var(--line);
}

.frame-brand{
  display:flex;
  align-items:center;
  gap:11px;
  min-width:0;
}
.frame-brand__mark{
  flex:0 0 auto;
  width:34px;
  height:34px;
  display:grid;
  place-items:center;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--deep-900);
  background-color:var(--orange-500);
  clip-path:polygon(0 0,100% 0,100% 68%,72% 100%,0 100%);
}
.frame-brand__text{
  display:flex;
  flex-direction:column;
  justify-content:center;
  min-width:0;
}
.frame-brand__name{
  font-size:16px;
  font-weight:800;
  letter-spacing:.05em;
  line-height:1.25;
  color:var(--paper-050);
}
.frame-brand__tag{
  font-size:11px;
  font-weight:500;
  letter-spacing:.14em;
  line-height:1.5;
  color:var(--gray-300);
  white-space:nowrap;
}

.frame-actions{
  display:flex;
  align-items:center;
  gap:10px;
  margin-left:auto;
}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-width:44px;
  min-height:44px;
  padding:0 12px;
  margin-left:auto;
  font-size:12px;
  font-weight:600;
  letter-spacing:.16em;
  color:var(--paper-050);
  border:1px solid var(--line-strong);
  background-color:rgba(20,64,110,.45);
  transition:border-color .18s var(--ease),background-color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--orange-500)}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:18px;
  height:12px;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  height:2px;
  background-color:currentColor;
  transition:transform .2s var(--ease),top .2s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:10px}
.site-frame[data-open] .nav-toggle__bars::before{top:5px;transform:rotate(45deg)}
.site-frame[data-open] .nav-toggle__bars::after{top:5px;transform:rotate(-45deg)}
.nav-toggle__label{line-height:1}

/* 滚动进度 */
.frame-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background-color:rgba(201,214,228,.1);
  pointer-events:none;
}
.frame-progress__bar{
  display:block;
  width:0;
  height:100%;
  background-image:linear-gradient(90deg,var(--orange-500),var(--orange-300));
}

/* 导航：桌面竖轨 / 移动底部抽屉 */
.frame-nav{
  position:fixed;
  z-index:79;
  background-color:var(--deep-900);
}
.frame-nav__item{width:100%}
.frame-nav__label{white-space:nowrap}

@media (min-width:1080px){
  .frame-nav{
    top:var(--top-h);
    left:0;
    bottom:0;
    width:var(--rail-w);
    padding:16px 8px 28px;
    border-right:1px solid var(--line);
    display:flex;
    flex-direction:column;
    overflow-y:auto;
  }
  .frame-nav__list{
    display:flex;
    flex-direction:column;
    gap:2px;
  }
  .frame-nav__link{
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:5px;
    padding:11px 4px;
    font-size:11px;
    font-weight:600;
    letter-spacing:.06em;
    line-height:1.2;
    text-align:center;
    color:var(--gray-300);
    transition:color .18s var(--ease),background-color .18s var(--ease),
               box-shadow .18s var(--ease);
  }
  .frame-nav__num{
    font-family:var(--font-mono);
    font-size:10px;
    font-weight:500;
    letter-spacing:.1em;
    font-variant-numeric:tabular-nums;
    color:var(--track-500);
  }
  .frame-nav__link:hover{
    color:var(--paper-050);
    background-color:rgba(46,111,168,.22);
  }
  .frame-nav__link[aria-current="page"]{
    color:var(--paper-050);
    background-color:rgba(46,111,168,.32);
    box-shadow:inset 3px 0 0 var(--orange-500);
  }
  .frame-nav__link[aria-current="page"] .frame-nav__num{color:var(--orange-500)}
}

@media (max-width:1079px){
  .nav-toggle{display:inline-flex}
  .frame-actions{display:none}

  .frame-nav{
    top:auto;
    left:0;
    right:0;
    bottom:0;
    width:100%;
    max-height:calc(100vh - var(--top-h));
    padding:14px 14px calc(20px + env(safe-area-inset-bottom,0px));
    border-top:1px solid var(--line-strong);
    box-shadow:0 -20px 44px rgba(2,10,20,.6);
    display:flex;
    flex-direction:column;
    overflow-y:auto;
    transform:translateY(102%);
    visibility:hidden;
    opacity:0;
    transition:transform .24s var(--ease),opacity .24s var(--ease),visibility 0s linear .24s;
  }
  .site-frame[data-open] .frame-nav{
    transform:translateY(0);
    visibility:visible;
    opacity:1;
    transition:transform .24s var(--ease),opacity .24s var(--ease),visibility 0s;
  }
  .frame-nav__list{display:flex;flex-direction:column}
  .frame-nav__link{
    display:flex;
    align-items:center;
    gap:14px;
    min-height:56px;
    padding:0 14px;
    font-size:15px;
    font-weight:600;
    letter-spacing:.04em;
    color:var(--gray-300);
    border-bottom:1px solid var(--line);
  }
  .frame-nav__num{
    min-width:24px;
    font-family:var(--font-mono);
    font-size:12px;
    font-weight:500;
    letter-spacing:.08em;
    color:var(--track-500);
  }
  .frame-nav__link:hover{
    color:var(--paper-050);
    background-color:rgba(46,111,168,.2);
  }
  .frame-nav__link[aria-current="page"]{
    color:var(--paper-050);
    background-color:rgba(46,111,168,.34);
    box-shadow:inset 3px 0 0 var(--orange-500);
  }
  .frame-nav__link[aria-current="page"] .frame-nav__num{color:var(--orange-500)}
}

@media (max-width:760px){
  .frame-brand__tag{display:none}
  .frame-brand__mark{width:30px;height:30px;font-size:11px}
  .frame-brand__name{font-size:15px}
  .nav-toggle__label{display:none}
  .nav-toggle{padding:0 11px}
}

/* ---------- 7. 看台页脚 ---------- */
.site-footer{
  position:relative;
  background-color:var(--stand-800);
  border-top:1px solid var(--line);
  color:var(--gray-300);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:3px;
  background-image:linear-gradient(90deg,
    var(--orange-500) 0 20%,
    var(--orange-300) 20% 32%,
    var(--track-500) 32% 74%,
    rgba(18,194,160,.55) 74% 100%);
}

.footer-inner{
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding:clamp(40px,5.5vw,64px) clamp(18px,4.5vw,44px) 32px;
  display:grid;
  grid-template-columns:minmax(0,1.35fr) minmax(0,2.4fr);
  gap:clamp(28px,4vw,56px);
}

.footer-brand{min-width:0}
.footer-brand__link{
  display:inline-block;
  font-family:var(--font-serif);
  font-size:clamp(21px,2.4vw,27px);
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.3;
  color:var(--paper-050);
}
.footer-brand__link:hover{color:var(--orange-300)}
.footer-brand__tag{
  margin-top:8px;
  font-size:12px;
  font-weight:600;
  letter-spacing:.16em;
  line-height:1.6;
  color:var(--track-500);
}
.footer-brand__note{
  margin-top:14px;
  max-width:34ch;
  font-size:13px;
  line-height:1.8;
  color:var(--muted);
}

.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,36px);
}
.footer-col__title{
  margin-bottom:14px;
  font-family:var(--font-sans);
  font-size:12px;
  font-weight:600;
  letter-spacing:.2em;
  line-height:1.5;
  color:var(--paper-050);
}
.footer-col__list{display:flex;flex-direction:column;gap:10px}
.footer-col__link{
  display:inline-block;
  padding:3px 0;
  font-size:14px;
  line-height:1.5;
  color:var(--gray-300);
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-col__link:hover{
  color:var(--paper-050);
  border-bottom-color:var(--orange-500);
}

.footer-contact{
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding:0 clamp(18px,4.5vw,44px) 26px;
  display:flex;
  flex-wrap:wrap;
  gap:10px 30px;
  font-size:13px;
  line-height:1.7;
  color:var(--muted);
}
.footer-contact__item{display:inline-flex;align-items:baseline;gap:9px}
.footer-contact__key{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.14em;
  color:var(--track-500);
}

.footer-legal{
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding:16px clamp(18px,4.5vw,44px) 30px;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 24px;
  border-top:1px solid var(--line);
  font-size:12px;
  letter-spacing:.06em;
  line-height:1.7;
  color:rgba(201,214,228,.68);
}
.footer-legal__item{margin:0}

@media (max-width:860px){
  .footer-inner{grid-template-columns:1fr}
  .footer-nav{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:520px){
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-legal{flex-direction:column;align-items:flex-start}
}

/* ---------- 8. 章节色带 ---------- */
.band{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:8px 18px;
  padding-block:14px;
  border-top:1px solid var(--line);
}
.band__num{
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:500;
  letter-spacing:.1em;
  font-variant-numeric:tabular-nums;
  color:var(--orange-500);
}
.band__label{
  font-size:12px;
  font-weight:600;
  letter-spacing:.2em;
  line-height:1.5;
  color:var(--gray-300);
}
.band__title{
  flex:0 0 100%;
  font-family:var(--font-serif);
  font-size:clamp(22px,2.8vw,36px);
  font-weight:700;
  line-height:1.22;
  letter-spacing:-.01em;
  color:var(--paper-050);
}
.band__note{
  flex:0 0 100%;
  max-width:54ch;
  font-size:14px;
  line-height:1.75;
  color:var(--muted);
}

/* ---------- 9. 面板 / 数据 / 图例 ---------- */
.panel{
  position:relative;
  padding:clamp(20px,2.6vw,32px);
  background-color:var(--stand-800);
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut-sm)),calc(100% - var(--cut-sm)) 100%,0 100%);
}
.panel--venue{background-color:var(--venue-700)}
.panel--paper{
  background-color:var(--paper-050);
  color:var(--ink-900);
  --line:rgba(26,36,48,.14);
  --line-strong:rgba(26,36,48,.3);
  --gray-300:#41556B;
  --paper-050:#0B2A4A;
  --muted:#3A4A5C;
  --link:var(--venue-700);
}
.panel--accent::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:4px;
  height:64px;
  background-color:var(--orange-500);
}

.metric{
  font-family:var(--font-mono);
  font-weight:500;
  font-variant-numeric:tabular-nums;
  letter-spacing:.01em;
}
.metric--up{color:var(--cyan-400)}
.metric--down{color:var(--orange-500)}

.legend{
  display:flex;
  flex-wrap:wrap;
  gap:8px 20px;
  font-size:12px;
  font-weight:500;
  letter-spacing:.1em;
  line-height:1.6;
  color:var(--gray-300);
}
.legend__item{display:inline-flex;align-items:center;gap:8px}
.legend__swatch{
  width:12px;
  height:12px;
  flex:0 0 auto;
  background-color:var(--cyan-400);
  clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);
}
.legend__swatch--orange{background-color:var(--orange-500)}
.legend__swatch--cyan{background-color:var(--cyan-400)}
.legend__swatch--track{background-color:var(--track-500)}
.legend__swatch--paper{background-color:var(--gray-300)}

/* ---------- 10. 长文流 ---------- */
.prose{
  max-width:68ch;
  font-size:17px;
  line-height:1.75;
}
.prose p{font-size:inherit}
.prose p + p{margin-top:1.2em}
.prose ul,
.prose ol{margin-top:1.2em;padding-left:1.1em;list-style:disc}
.prose li + li{margin-top:.5em}
.prose h2,
.prose h3{margin-top:1.6em;margin-bottom:.6em}
.prose strong{color:inherit;font-weight:700}

/* ---------- 11. 图片容器 ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  background-color:var(--venue-700);
  isolation:isolate;
}
.media > img,
.media > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:linear-gradient(158deg,
    rgba(5,24,46,0) 8%,
    rgba(5,24,46,.52) 62%,
    rgba(5,24,46,.92) 100%);
  clip-path:polygon(0 0,100% 0,100% 100%,0 84%);
}
.media--cut{
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut-lg)),calc(100% - var(--cut-lg)) 100%,0 100%);
}
.media--plain::after{display:none}

.ratio-16x9{aspect-ratio:16/9}
.ratio-4x3{aspect-ratio:4/3}
.ratio-1x1{aspect-ratio:1/1}
.ratio-3x4{aspect-ratio:3/4}

.media-caption{
  margin-top:10px;
  font-size:12px;
  letter-spacing:.08em;
  line-height:1.6;
  color:var(--gray-300);
}

/* ---------- 12. 分段切换 ---------- */
.tabs{
  display:flex;
  flex-wrap:wrap;
  gap:4px;
  border-bottom:1px solid var(--line);
}
.tab{
  position:relative;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 16px;
  font-size:13px;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--gray-300);
  transition:color .18s var(--ease);
}
.tab:hover{color:var(--paper-050)}
.tab[aria-selected="true"]{color:var(--paper-050)}
.tab[aria-selected="true"]::after{
  content:"";
  position:absolute;
  left:10px;
  right:10px;
  bottom:-1px;
  height:3px;
  background-color:var(--orange-500);
}
.tabpanel{padding-top:22px}
.tabpanel[hidden]{display:none}
.tabpanel:not([hidden]){animation:tabIn .18s var(--ease) both}
@keyframes tabIn{
  from{opacity:0;transform:translateY(6px)}
  to{opacity:1;transform:none}
}

/* ---------- 13. 折叠问答 ---------- */
.fold{border-top:1px solid var(--line)}
.fold__summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  min-height:56px;
  padding:14px 0;
  font-size:16px;
  font-weight:600;
  line-height:1.6;
  color:var(--paper-050);
  cursor:pointer;
  list-style:none;
}
.fold__summary::-webkit-details-marker{display:none}
.fold__summary::after{
  content:"";
  flex:0 0 auto;
  width:10px;
  height:10px;
  margin-right:4px;
  border-right:2px solid var(--orange-500);
  border-bottom:2px solid var(--orange-500);
  transform:rotate(45deg);
  transition:transform .2s var(--ease);
}
details[open] > .fold__summary::after{transform:rotate(-135deg)}
.fold__body{
  padding:0 0 20px;
  max-width:68ch;
  font-size:15px;
  line-height:1.8;
  color:var(--muted);
}

/* ---------- 14. 面包屑 ---------- */
.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding-block:18px;
  font-size:12px;
  font-weight:500;
  letter-spacing:.1em;
  line-height:1.6;
  color:var(--gray-300);
}
.breadcrumbs__link{color:var(--gray-300)}
.breadcrumbs__link:hover{color:var(--orange-300)}
.breadcrumbs__sep{color:var(--track-500)}
.breadcrumbs__current{color:var(--paper-050)}

/* ---------- 15. 滚动显现 ---------- */
[data-reveal]{
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
.js-reveal [data-reveal]{
  opacity:0;
  transform:translateY(20px);
}
.js-reveal [data-reveal].is-revealed{
  opacity:1;
  transform:none;
}

/* ---------- 16. 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;
    scroll-behavior:auto!important;
  }
  .js-reveal [data-reveal]{
    opacity:1;
    transform:none;
  }
  .tabpanel:not([hidden]){animation:none}
}