/* ==========================================================================
   GOGO体育站 · 共享样式表 /assets/site.css
   深空蓝骨架 + 荧光绿路径 + 珠宝色分区 + 等宽索引
   ========================================================================== */

:root{
  /* 色板 */
  --ink-900:#071223;
  --ink-700:#0F2647;
  --ink-500:#1D3F73;
  --lime-400:#C6FF3D;
  --lime-700:#46750A;
  --orange-500:#FF7A2F;
  --white-50:#F7FAFF;
  --haze-200:#E3EAF3;
  --black-900:#0C1520;
  --gray-500:#55677E;
  --jade-800:#0B3B3C;
  --violet-800:#32204F;

  /* 语义映射 */
  --bg:var(--ink-900);
  --bg-soft:var(--ink-700);
  --line:var(--ink-500);
  --text:var(--white-50);
  --text-muted:rgba(227,234,243,.7);
  --accent:var(--lime-400);
  --accent-ink:var(--lime-700);
  --warm:var(--orange-500);
  --light-bg:var(--white-50);
  --light-line:var(--haze-200);
  --light-text:var(--black-900);
  --light-muted:var(--gray-500);

  /* 字体 */
  --font-display:"Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:var(--font-display);
  --font-mono:"JetBrains Mono","SFMono-Regular",ui-monospace,"Cascadia Mono","Menlo","Consolas",monospace;

  /* 尺度 */
  --shell-max:1240px;
  --header-h:64px;
  --radius-xl:28px;
  --radius-lg:20px;
  --radius-md:14px;
  --radius-sm:8px;
  --shadow-1:0 18px 44px rgba(3,9,20,.5);

  /* 全站统一的斜切方向与角度（6–12 度） */
  --cut-band:polygon(0 0,100% 4%,100% 100%,0 96%);
  --cut-soft:polygon(0 2%,100% 0,100% 98%,0 100%);
}

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

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-block-start:calc(var(--header-h) + 20px);
}

body{
  margin:0;
  background-color:var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,h5{
  margin:0;
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.18;
  letter-spacing:-.012em;
}

h1{
  font-size:clamp(38px,7vw,64px);
  font-weight:900;
  line-height:1.05;
  letter-spacing:-.02em;
}

h2{font-size:clamp(24px,3.4vw,34px);line-height:1.25}
h3{font-size:22px;line-height:1.3}
h4{font-size:18px}

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

:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
  border-radius:6px;
}

.surface-light :focus-visible{outline-color:var(--accent-ink)}

.sr-only{
  position:absolute;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  white-space:nowrap;
  border:0;
}

#main-content{scroll-margin-block-start:calc(var(--header-h) + 16px)}

/* --------------------------------------------------------------------------
   版心
   -------------------------------------------------------------------------- */
.shell{
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding-inline:20px;
}

.text-muted{color:var(--text-muted)}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--accent);
}

.index-number{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.14em;
  color:var(--accent);
}

.section-head{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
  align-items:baseline;
  justify-content:space-between;
  margin-block-end:26px;
}

.cut-tilt{clip-path:var(--cut-soft)}

.surface-light{
  background:var(--light-bg);
  color:var(--light-text);
}

.surface-light a{color:var(--accent-ink)}

/* --------------------------------------------------------------------------
   跳转链接
   -------------------------------------------------------------------------- */
.skip-link{
  position:fixed;
  inset-block-start:10px;
  inset-inline-start:10px;
  z-index:200;
  padding:10px 20px;
  border-radius:999px;
  background:var(--accent);
  color:var(--ink-900);
  font-size:14px;
  font-weight:700;
  transform:translateY(-180%);
  transition:transform .2s ease;
}

.skip-link:focus{transform:translateY(0)}

/* --------------------------------------------------------------------------
   顶部阅读进度
   -------------------------------------------------------------------------- */
.read-progress{
  position:absolute;
  inset-inline:0;
  inset-block-end:-1px;
  height:3px;
  background:rgba(29,63,115,.45);
  overflow:hidden;
  pointer-events:none;
}

.read-progress__bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--lime-400) 0%,var(--orange-500) 100%);
  transition:width .1s linear;
}

/* --------------------------------------------------------------------------
   头部
   -------------------------------------------------------------------------- */
.site-header{
  position:fixed;
  inset-block-start:0;
  inset-inline:0;
  z-index:90;
  background-color:transparent;
  border-block-end:1px solid transparent;
  transition:background-color .28s ease,border-color .28s ease,box-shadow .28s ease;
}

.site-header[data-stuck="true"]{
  background-color:rgba(7,18,35,.97);
  border-block-end-color:var(--line);
  box-shadow:0 14px 34px rgba(3,9,20,.5);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}

.site-header__shell{
  display:flex;
  align-items:center;
  gap:18px;
  max-width:var(--shell-max);
  min-height:var(--header-h);
  margin-inline:auto;
  padding:12px 20px;
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
}

.brand__mark{
  display:grid;
  place-items:center;
  width:36px;
  height:36px;
  border-radius:11px;
  background:linear-gradient(140deg,var(--lime-400),#8FD117);
  color:var(--ink-900);
  font-family:var(--font-mono);
  font-size:17px;
  font-weight:700;
  letter-spacing:.02em;
  box-shadow:0 10px 24px rgba(198,255,61,.24);
}

.brand__text{display:flex;flex-direction:column;line-height:1.15}

.brand__name{
  font-family:var(--font-display);
  font-size:17px;
  font-weight:800;
  letter-spacing:-.01em;
}

.brand__line{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--text-muted);
}

@media (max-width:520px){
  .brand__line{display:none}
}

/* 主导航：移动优先 = 抽屉面板 */
.primary-nav{
  position:fixed;
  inset-block-start:calc(var(--header-h) + 10px);
  inset-inline:12px;
  display:flex;
  flex-direction:column;
  gap:6px;
  padding:16px;
  max-height:calc(100vh - var(--header-h) - 24px);
  overflow-y:auto;
  background:rgba(9,22,41,.985);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-1);
  opacity:0;
  visibility:hidden;
  transform:translateY(-12px);
  transition:opacity .22s ease,transform .22s ease,visibility .22s ease;
}

.primary-nav[data-open]{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}

.primary-nav__list{
  display:flex;
  flex-direction:column;
  gap:2px;
}

.primary-nav__link{
  display:block;
  padding:12px 14px;
  border-radius:var(--radius-md);
  font-size:16px;
  font-weight:600;
  color:var(--text);
  transition:background-color .2s ease,color .2s ease;
}

.primary-nav__link:hover{
  background:rgba(29,63,115,.55);
  color:var(--lime-400);
}

.primary-nav__link[aria-current="page"]{
  color:var(--lime-400);
  background:rgba(198,255,61,.09);
}

.nav-utility{
  display:flex;
  flex-direction:column;
  gap:2px;
  margin-block-start:10px;
  padding-block-start:14px;
  border-block-start:1px solid var(--line);
}

.nav-utility__link{
  display:block;
  padding:10px 14px;
  border-radius:var(--radius-md);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--text-muted);
  transition:color .2s ease,background-color .2s ease;
}

.nav-utility__link:hover{
  color:var(--lime-400);
  background:rgba(29,63,115,.45);
}

.nav-utility .btn{
  margin-block-start:12px;
  justify-content:center;
}

/* 抽屉按钮 */
.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:9px;
  margin-inline-start:auto;
  padding:9px 14px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(15,38,71,.7);
  color:var(--text);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  transition:border-color .2s ease,color .2s ease;
}

.nav-toggle:hover{border-color:var(--lime-400);color:var(--lime-400)}

.nav-toggle__bars{
  display:flex;
  flex-direction:column;
  gap:4px;
  width:16px;
}

.nav-toggle__bars span{
  display:block;
  height:2px;
  border-radius:2px;
  background:var(--lime-400);
  transition:transform .22s ease,opacity .22s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) 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(-6px) rotate(-45deg)}

.nav-toggle__label{white-space:nowrap}

/* 桌面端：横向透明导航 */
@media (min-width:1024px){
  .primary-nav{
    position:static;
    inset:auto;
    flex-direction:row;
    align-items:center;
    gap:22px;
    margin-inline-start:auto;
    padding:0;
    max-height:none;
    overflow:visible;
    background:none;
    border:0;
    border-radius:0;
    box-shadow:none;
    opacity:1;
    visibility:visible;
    transform:none;
  }

  .primary-nav__list{flex-direction:row;gap:22px}

  .primary-nav__link{
    position:relative;
    padding:6px 2px;
    border-radius:0;
    font-size:15px;
    font-weight:500;
  }

  .primary-nav__link:hover{background:none;color:var(--lime-400)}
  .primary-nav__link[aria-current="page"]{background:none;color:var(--lime-400)}

  .primary-nav__link[aria-current="page"]::after{
    content:"";
    position:absolute;
    inset-inline:2px;
    inset-block-end:-6px;
    height:2px;
    border-radius:2px;
    background:var(--lime-400);
  }

  .nav-utility{
    flex-direction:row;
    align-items:center;
    gap:16px;
    margin:0;
    padding:0 0 0 22px;
    border-block-start:0;
    border-inline-start:1px solid var(--line);
  }

  .nav-utility__link{padding:4px 0;font-size:11px}
  .nav-utility .btn{margin:0}

  .nav-toggle{display:none}
}

@media (max-width:1023px){
  body.nav-open{overflow:hidden}
}

/* --------------------------------------------------------------------------
   按钮
   -------------------------------------------------------------------------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  border:1px solid transparent;
  border-radius:999px;
  font-family:var(--font-display);
  font-size:15px;
  font-weight:700;
  letter-spacing:.01em;
  transition:transform .2s ease,background-color .2s ease,border-color .2s ease,color .2s ease;
}

.btn:hover{transform:translateY(-2px)}

.btn--primary{
  background:var(--accent);
  color:var(--ink-900);
}

.btn--primary:hover{background:#D8FF6B}

.btn--ghost{
  background:rgba(15,38,71,.35);
  border-color:var(--line);
  color:var(--text);
}

.btn--ghost:hover{
  border-color:var(--accent);
  color:var(--accent);
}

.btn--warm{
  background:var(--warm);
  color:var(--ink-900);
}

.btn--warm:hover{background:#FF9257}

.btn--sm{padding:9px 16px;font-size:13px}
.btn--block{width:100%}

/* --------------------------------------------------------------------------
   页脚
   -------------------------------------------------------------------------- */
.site-footer{
  position:relative;
  margin-block-start:80px;
  padding-block:56px 28px;
  background-color:var(--ink-900);
  border-block-start:1px solid var(--line);
  overflow:hidden;
  color:var(--text);
}

.site-footer::before{
  content:"";
  position:absolute;
  inset-block-start:-1px;
  inset-inline-start:0;
  width:min(460px,58%);
  height:3px;
  background:linear-gradient(90deg,var(--lime-400),rgba(198,255,61,0));
}

.site-footer__glow{
  position:absolute;
  inset-block-end:-200px;
  inset-inline-end:-120px;
  width:min(640px,72%);
  aspect-ratio:1;
  background:radial-gradient(circle,rgba(198,255,61,.15),transparent 62%);
  pointer-events:none;
}

.site-footer__shell{
  position:relative;
  display:grid;
  grid-template-columns:1fr;
  gap:36px;
  padding-block-end:36px;
  border-block-end:1px solid var(--line);
}

.site-footer__brand{display:block}

.site-footer__note{
  max-width:40ch;
  margin-block-start:16px;
  font-size:15px;
  line-height:1.75;
  color:var(--text-muted);
}

.footer-nav{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:28px;
}

.footer-nav__col{min-width:0}

.footer-nav__title{
  margin-block-end:14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--accent);
}

.footer-nav__list{
  display:flex;
  flex-direction:column;
  gap:10px;
}

.footer-nav__link{
  display:inline-block;
  font-size:15px;
  color:rgba(247,250,255,.78);
  transition:color .2s ease,transform .2s ease;
}

.footer-nav__link:hover{
  color:var(--accent);
  transform:translateX(3px);
}

.footer-contact__title{
  margin-block-end:14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--accent);
}

.footer-contact__list{
  display:flex;
  flex-direction:column;
  gap:10px;
}

.footer-contact__item{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  font-size:14px;
  line-height:1.6;
}

.footer-contact__key{
  min-width:38px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--text-muted);
}

.footer-contact__val{
  color:rgba(247,250,255,.88);
  word-break:break-word;
}

.footer-contact__hint{
  margin-block-start:16px;
  font-size:13px;
  line-height:1.7;
  color:var(--text-muted);
}

.site-footer__legal{
  position:relative;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  padding-block-start:24px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--text-muted);
}

.legal-line{margin:0}

@media (min-width:768px){
  .site-footer{margin-block-start:104px;padding-block:68px 32px}
  .site-footer__shell{grid-template-columns:repeat(2,minmax(0,1fr));gap:32px}
  .footer-nav{grid-template-columns:repeat(3,minmax(0,1fr))}
}

@media (min-width:1024px){
  .site-footer__shell{grid-template-columns:1.15fr 1.5fr .95fr;gap:44px}
}

/* --------------------------------------------------------------------------
   面包屑
   -------------------------------------------------------------------------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--text-muted);
}

.breadcrumb__link{
  color:var(--text-muted);
  transition:color .2s ease;
}

.breadcrumb__link:hover{color:var(--accent)}
.breadcrumb__sep{color:var(--line)}
.breadcrumb [aria-current="page"]{color:var(--accent)}

.surface-light .breadcrumb{color:var(--light-muted)}
.surface-light .breadcrumb__link{color:var(--light-muted)}
.surface-light .breadcrumb__link:hover{color:var(--accent-ink)}
.surface-light .breadcrumb [aria-current="page"]{color:var(--accent-ink)}

/* --------------------------------------------------------------------------
   正文
   -------------------------------------------------------------------------- */
.prose{
  max-width:72ch;
  font-size:17px;
  line-height:1.8;
  color:rgba(247,250,255,.84);
}

.prose h2,
.prose h3{margin-block:1.6em .6em;color:var(--text)}
.prose p + p{margin-block-start:1.1em}
.prose ul,
.prose ol{margin-block:1em;padding-inline-start:1.4em;list-style:disc}
.prose ol{list-style:decimal}
.prose li + li{margin-block-start:.4em}
.prose strong{color:var(--accent)}

.surface-light .prose{color:var(--light-muted)}
.surface-light .prose h2,
.surface-light .prose h3{color:var(--light-text)}
.surface-light .prose strong{color:var(--accent-ink)}

/* --------------------------------------------------------------------------
   栅格与 Bento
   -------------------------------------------------------------------------- */
.grid{display:grid;grid-template-columns:1fr;gap:20px}

@media (min-width:768px){
  .grid--2,
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (min-width:1024px){
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
}

.bento{display:grid;grid-template-columns:1fr;gap:18px}

@media (min-width:768px){
  .bento{grid-template-columns:repeat(6,minmax(0,1fr))}
  .bento__cell--full{grid-column:1 / -1}
  .bento__cell--wide{grid-column:span 4}
  .bento__cell--half{grid-column:span 3}
  .bento__cell--third{grid-column:span 2}
  .bento__cell--tall{grid-row:span 2}
}

/* --------------------------------------------------------------------------
   面板 / 卡片
   -------------------------------------------------------------------------- */
.panel{
  position:relative;
  padding:22px;
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  background:linear-gradient(160deg,rgba(15,38,71,.94),rgba(7,18,35,.94));
  transition:transform .22s ease,border-color .22s ease;
}

.panel:hover{
  transform:translateY(-4px);
  border-color:rgba(198,255,61,.55);
}

.panel--flat{background:var(--ink-700)}
.panel--cut{border-radius:0;clip-path:var(--cut-soft)}

.panel--light{
  background:#FFFFFF;
  border-color:var(--light-line);
  color:var(--light-text);
}

.panel--light:hover{border-color:var(--accent-ink)}

/* 标签 */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 12px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(15,38,71,.5);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--text-muted);
  transition:border-color .2s ease,color .2s ease,background-color .2s ease;
}

.tag--accent{
  border-color:rgba(198,255,61,.6);
  background:rgba(198,255,61,.08);
  color:var(--accent);
}

.tag--warm{
  border-color:rgba(255,122,47,.6);
  background:rgba(255,122,47,.1);
  color:var(--warm);
}

button.tag{cursor:pointer}
button.tag:hover{border-color:var(--accent);color:var(--accent)}
button.tag[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:var(--ink-900)}

/* 统计 */
.stat{display:flex;flex-direction:column;gap:6px}

.stat__value{
  font-family:var(--font-mono);
  font-size:clamp(28px,4.4vw,44px);
  font-weight:700;
  line-height:1.05;
  letter-spacing:-.02em;
  color:var(--accent);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
}

.stat__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--text-muted);
}

.surface-light .stat__value{color:var(--accent-ink)}
.surface-light .stat__label{color:var(--light-muted)}

/* --------------------------------------------------------------------------
   横向主题带
   -------------------------------------------------------------------------- */
.theme-band{
  position:relative;
  padding-block:56px;
  background-color:var(--jade-800);
  color:var(--text);
  clip-path:var(--cut-band);
}

.theme-band--violet{background-color:var(--violet-800)}
.theme-band--ink{background-color:var(--ink-700)}

.theme-band--light{
  background-color:var(--haze-200);
  color:var(--light-text);
}

@media (min-width:1024px){
  .theme-band{padding-block:72px}
}

/* --------------------------------------------------------------------------
   时间轴
   -------------------------------------------------------------------------- */
.timeline{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:24px;
  padding-inline-start:26px;
}

.timeline::before{
  content:"";
  position:absolute;
  inset-block:6px;
  inset-inline-start:6px;
  width:2px;
  background:linear-gradient(180deg,var(--lime-400),rgba(29,63,115,.35));
}

.timeline__item{position:relative}

.timeline__item::before{
  content:"";
  position:absolute;
  inset-inline-start:-26px;
  inset-block-start:8px;
  width:12px;
  height:12px;
  border-radius:50%;
  background:var(--ink-900);
  border:2px solid var(--lime-400);
  transition:transform .2s ease;
}

.timeline__item:hover::before{transform:scale(1.06)}

.surface-light .timeline__item::before{background:var(--light-bg)}

/* --------------------------------------------------------------------------
   图片容器（供页面阶段放置 <img> / <picture>）
   -------------------------------------------------------------------------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  background:linear-gradient(150deg,var(--ink-700),#050D19);
}

.media > img,
.media > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
}

.media--hero{aspect-ratio:16/9}
.media--photo{aspect-ratio:4/3}
.media--square{aspect-ratio:1/1}
.media--portrait{aspect-ratio:3/4}
.media--wide{aspect-ratio:21/9}

.media--jade::after,
.media--violet::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
}

.media--jade::after{background:linear-gradient(180deg,rgba(11,59,60,.55),rgba(7,18,35,.15))}
.media--violet::after{background:linear-gradient(180deg,rgba(50,32,79,.58),rgba(7,18,35,.12))}

.media__scrim{
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(7,18,35,0) 42%,rgba(7,18,35,.84));
  pointer-events:none;
}

.media__caption{
  position:absolute;
  inset-inline:0;
  inset-block-end:0;
  padding:16px;
  font-size:14px;
  line-height:1.6;
  color:var(--text);
}

/* --------------------------------------------------------------------------
   右侧章节索引（由 JS 生成）
   -------------------------------------------------------------------------- */
.section-rail{
  position:fixed;
  inset-block-start:50%;
  inset-inline-end:16px;
  transform:translateY(-50%);
  z-index:70;
  display:none;
  flex-direction:column;
  align-items:flex-end;
  gap:8px;
}

@media (min-width:1200px){
  .section-rail{display:flex}
}

.section-rail__item{
  padding:6px 12px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(7,18,35,.74);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--text-muted);
  transition:color .22s ease,background-color .22s ease,border-color .22s ease;
}

.section-rail__item:hover{
  color:var(--text);
  border-color:var(--lime-400);
}

.section-rail__item[aria-current="true"]{
  background:var(--lime-400);
  border-color:var(--lime-400);
  color:var(--ink-900);
}

/* --------------------------------------------------------------------------
   滚动显现
   -------------------------------------------------------------------------- */
html.js [data-reveal]{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .55s ease,transform .55s ease;
}

html.js [data-reveal][data-revealed="true"]{
  opacity:1;
  transform:none;
}

/* --------------------------------------------------------------------------
   减少动态
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}

  *,
  *::before,
  *::after{
    transition-duration:.01ms !important;
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
  }

  html.js [data-reveal]{
    opacity:1;
    transform:none;
  }

  .btn:hover,
  .panel:hover,
  .footer-nav__link:hover{transform:none}
}