/* ============================================================
   /assets/site.css — 海博体育入口 共享样式
   1 变量 / 2 重置 / 3 排版 / 4 布局工具 / 5 头部 / 6 页脚
   7 通用组件 / 8 动效 / 9 响应式与无障碍
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root{
  --ink:#04121D;
  --sea:#0A2238;
  --cyan:#35F2D0;
  --turf:#2FBF71;
  --orange:#FF8A3D;
  --paper:#F3E9D2;
  --mist:#E6F1F5;
  --steel:#6E8CA8;
  --teal-ink:#062B2A;
  --alert:#E45757;

  --rail-w:88px;
  --header-h:64px;
  --content-max:1180px;
  --page-max:1440px;
  --gutter:clamp(16px,4vw,48px);

  --hair:rgba(230,241,245,.14);
  --hair-soft:rgba(230,241,245,.08);
  --hair-cyan:rgba(53,242,208,.38);
  --shadow-soft:0 26px 50px -36px rgba(0,0,0,.95);

  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  background:var(--ink);
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}
body,h1,h2,h3,h4,h5,p,figure,blockquote,ul,ol,li,dl,dd,fieldset{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
[hidden]{display:none !important}
:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:2px;
}

/* ---------- 3. 排版 ---------- */
body{
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.7;
  color:var(--mist);
  background:var(--ink);
  padding-top:var(--header-h);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-weight:800;letter-spacing:-.02em;line-height:1.06;color:var(--mist)}
h1{font-size:clamp(40px,7vw,92px);line-height:1}
h2{font-size:clamp(28px,4vw,44px)}
h3{font-size:clamp(20px,2.4vw,26px)}
h4{font-size:clamp(17px,1.8vw,20px)}
p{text-wrap:pretty}
strong{color:var(--cyan);font-weight:700}
::selection{background:var(--cyan);color:var(--ink)}

/* ---------- 4. 布局工具 ---------- */
.container{
  width:100%;
  max-width:var(--content-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(40px,7vw,88px)}
.section--sea{background:linear-gradient(180deg,var(--ink),var(--sea) 22%,var(--sea) 78%,var(--ink))}
.section--paper{background:var(--paper);color:var(--ink)}
.section--paper :is(h1,h2,h3,h4,p,li){color:var(--ink)}
.section--paper strong{color:#0b6f60}

.section-head{
  display:grid;
  gap:12px;
  max-width:70ch;
  margin-bottom:clamp(20px,3vw,36px);
}
.section-head__title{font-size:clamp(26px,3.6vw,42px)}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.26em;
  color:var(--cyan);
}
.eyebrow::before{
  content:"";
  width:7px;height:7px;
  background:var(--cyan);
  box-shadow:0 0 12px rgba(53,242,208,.75);
}
.coordinate{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.22em;
  color:var(--steel);
}
.divider{
  height:1px;
  border:0;
  background:linear-gradient(90deg,var(--hair-cyan),var(--hair) 38%,transparent);
  margin-block:clamp(24px,4vw,44px);
}

.grid{display:grid;gap:clamp(14px,2.4vw,24px);grid-template-columns:1fr}
@media (min-width:720px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1024px){
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
}
.split{display:grid;gap:clamp(16px,3vw,32px);grid-template-columns:1fr}
@media (min-width:900px){
  .split{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* ---------- 5. 头部 ---------- */
.skip-link{
  position:fixed;
  top:8px;left:8px;
  z-index:300;
  padding:10px 16px;
  background:var(--cyan);
  color:var(--ink);
  font-size:13px;
  font-weight:700;
  letter-spacing:.06em;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

.site-header{
  position:fixed;
  inset:0 0 auto 0;
  z-index:60;
  height:var(--header-h);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:0 clamp(14px,4vw,22px);
  background:linear-gradient(180deg,#061A28,#04121D);
  border-bottom:1px solid var(--hair);
  box-shadow:0 14px 34px -28px #000;
}

.brand-lockup{min-width:0;flex:0 1 auto}
.brand{display:flex;align-items:center;gap:10px;color:var(--mist)}
.brand__mark{
  position:relative;
  flex:0 0 auto;
  width:30px;height:30px;
  display:grid;
  place-items:center;
  border:1px solid var(--hair-cyan);
  background:rgba(53,242,208,.07);
}
.brand__mark::before{
  content:"";
  position:absolute;
  inset:4px;
  border:1px solid var(--hair-soft);
}
.brand__mark-core{
  width:9px;height:9px;
  background:var(--cyan);
  transform:rotate(45deg);
  box-shadow:0 0 14px rgba(53,242,208,.7);
}
.brand__text{display:block;min-width:0}
.brand__name{
  display:block;
  font-size:15px;
  font-weight:800;
  letter-spacing:.08em;
  line-height:1.15;
  color:var(--mist);
}
.brand__tag{
  display:block;
  margin-top:3px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.2em;
  color:var(--steel);
  line-height:1.3;
}

.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 11px;
  border:1px solid var(--hair-cyan);
  border-radius:2px;
  color:var(--cyan);
  background:rgba(53,242,208,.06);
  font-size:11px;
  letter-spacing:.22em;
}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars i{
  display:block;
  height:1.5px;
  background:currentColor;
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.site-header[data-open] .nav-toggle__bars i:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars i:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars i:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}
.nav-toggle__label{line-height:1}

.scroll-meter{
  position:absolute;
  left:0;bottom:0;
  width:100%;height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--turf));
  transform:scaleX(var(--progress,0));
  transform-origin:0 50%;
  pointer-events:none;
  box-shadow:0 0 12px rgba(53,242,208,.55);
}

.nav-drawer{
  position:fixed;
  inset:var(--header-h) 0 0 0;
  z-index:55;
  padding:22px var(--gutter) 40px;
  overflow-y:auto;
  overscroll-behavior:contain;
  background:
    radial-gradient(120% 70% at 80% 0%,rgba(53,242,208,.10),transparent 60%),
    linear-gradient(165deg,#061A28,#04121D 65%);
  border-top:1px solid var(--hair);
  opacity:0;
  visibility:hidden;
  pointer-events:none;
  transform:translateY(-10px);
  transition:opacity .2s var(--ease),transform .24s var(--ease),visibility .24s;
}
.site-header[data-open] .nav-drawer{
  opacity:1;
  visibility:visible;
  pointer-events:auto;
  transform:none;
}

.nav{display:block}
.nav__list{display:grid;gap:2px;width:100%}
.nav__item{min-width:0}
.nav__link{
  display:flex;
  align-items:center;
  gap:14px;
  padding:14px 10px;
  border-bottom:1px solid var(--hair-soft);
  color:var(--mist);
  font-size:17px;
  font-weight:700;
  letter-spacing:.04em;
  transition:color .18s var(--ease),background .18s var(--ease),padding-left .18s var(--ease);
}
.nav__link:hover{color:var(--cyan);background:rgba(53,242,208,.06);padding-left:16px}
.nav__index{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--steel);
}
.nav__label{line-height:1.2}
.nav__link[aria-current="page"]{
  color:var(--cyan);
  box-shadow:inset 2px 0 0 0 var(--cyan);
  background:rgba(53,242,208,.08);
}
.nav__link[aria-current="page"] .nav__index{color:var(--turf)}

.rail-scale{
  display:flex;
  align-items:center;
  gap:6px;
  margin-top:22px;
  padding:0 10px;
}
.rail-scale__tick{display:block;width:1px;height:10px;background:var(--hair)}
.rail-scale__tick--major{height:18px;background:var(--hair-cyan)}

.rail-utility{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px;padding:0 10px}
.rail-utility__link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:7px 10px;
  border:1px solid var(--hair-cyan);
  border-radius:2px;
  background:rgba(53,242,208,.07);
  color:var(--cyan);
  font-size:11px;
  letter-spacing:.14em;
  transition:background .18s var(--ease),transform .18s var(--ease);
}
.rail-utility__link:hover{background:rgba(53,242,208,.18);transform:translateY(-1px)}

.rail-note{
  margin-top:14px;
  padding:0 10px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  color:var(--steel);
}

/* 桌面端：竖排轨道 */
@media (min-width:1024px){
  body{padding-top:0;padding-left:var(--rail-w)}

  .site-header{
    inset:0 auto 0 0;
    width:var(--rail-w);
    height:100vh;
    height:100dvh;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    padding:18px 0 14px;
    border-bottom:0;
    border-right:1px solid var(--hair);
    background:
      linear-gradient(180deg,#04121D 0%,#08202F 50%,#04121D 100%);
    box-shadow:none;
  }

  .brand-lockup{
    display:flex;
    justify-content:center;
    padding:0 6px 16px;
    margin:0 10px;
    border-bottom:1px solid var(--hair);
  }
  .brand{flex-direction:column;gap:8px;text-align:center}
  .brand__mark{width:32px;height:32px}
  .brand__name{writing-mode:vertical-rl;text-orientation:upright;font-size:13px;letter-spacing:.2em;margin:0 auto}
  .brand__tag{writing-mode:vertical-rl;text-orientation:upright;font-size:9px;letter-spacing:.16em;margin:6px auto 0}

  .nav-toggle{display:none}

  .scroll-meter{
    left:auto;right:0;top:0;bottom:auto;
    width:2px;height:100%;
    transform:scaleY(var(--progress,0));
    transform-origin:50% 0;
  }

  .nav-drawer{
    position:relative;
    inset:auto;
    z-index:auto;
    flex:1 1 auto;
    min-height:0;
    display:flex;
    flex-direction:column;
    padding:0;
    overflow:visible;
    background:none;
    border-top:0;
    opacity:1;
    visibility:visible;
    pointer-events:auto;
    transform:none;
  }

  .nav{flex:1 1 auto;min-height:0;display:flex;align-items:center;overflow-y:auto;overflow-x:hidden;padding:8px 0}
  .nav__list{gap:0}
  .nav__link{
    flex-direction:column;
    align-items:center;
    gap:7px;
    padding:12px 0;
    font-size:13px;
    border-bottom:0;
    transition:color .18s var(--ease),background .18s var(--ease);
  }
  .nav__item + .nav__item .nav__link{border-top:1px solid var(--hair-soft)}
  .nav__link:hover{padding-left:0;color:var(--cyan);background:rgba(53,242,208,.07)}
  .nav__label{writing-mode:vertical-rl;text-orientation:upright;font-size:13px;letter-spacing:.16em}
  .nav__index{font-size:9px;letter-spacing:.06em}
  .nav__link[aria-current="page"]{padding-left:0;box-shadow:inset 2px 0 0 0 var(--cyan)}

  .rail-scale{
    position:absolute;
    top:0;right:0;bottom:0;
    margin:0;padding:64px 3px;
    width:9px;
    flex-direction:column;
    justify-content:space-between;
    align-items:flex-end;
  }
  .rail-scale__tick{width:6px;height:1px;background:rgba(230,241,245,.22)}
  .rail-scale__tick--major{width:12px;height:2px;background:var(--hair-cyan)}

  .rail-utility{
    flex-direction:column;
    gap:7px;
    margin:10px 0 0;
    padding:0 8px;
  }
  .rail-utility__link{justify-content:center;padding:6px 4px;font-size:10px;letter-spacing:.06em}

  .rail-note{margin-top:10px;padding:0 6px;font-size:9px;letter-spacing:.1em;text-align:center}
}

@media (min-width:1024px) and (max-height:840px){
  .brand__tag{display:none}
  .nav__link{padding:8px 0}
  .nav__label{font-size:12px;letter-spacing:.12em}
  .rail-note{display:none}
}
@media (min-width:1024px) and (max-height:680px){
  .brand__name{font-size:12px;letter-spacing:.14em}
  .nav__link{padding:6px 0;gap:5px}
  .nav__index{display:none}
  .rail-utility__link{font-size:9px}
}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,96px);
  padding:clamp(36px,6vw,64px) 0 24px;
  background:
    radial-gradient(90% 60% at 12% 0%,rgba(53,242,208,.09),transparent 62%),
    linear-gradient(180deg,var(--sea) 0%,#071B2B 46%,var(--ink) 100%);
  border-top:1px solid var(--hair);
  color:var(--mist);
  font-size:14px;
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:6px;
  background-image:repeating-linear-gradient(90deg,var(--hair-cyan) 0 1px,transparent 1px 26px);
  opacity:.7;
}
.footer__grid{display:grid;gap:clamp(26px,4vw,48px);grid-template-columns:1fr}
@media (min-width:720px){
  .footer__grid{grid-template-columns:1.15fr 1.6fr}
}
@media (min-width:1080px){
  .footer__grid{grid-template-columns:1.05fr 1.7fr 1.15fr;align-items:start}
}

.footer__brand{min-width:0}
.footer__mark{
  position:relative;
  display:block;
  width:26px;height:26px;
  border:1px solid var(--hair-cyan);
  background:rgba(53,242,208,.07);
}
.footer__mark::after{
  content:"";
  position:absolute;
  inset:8px;
  background:var(--cyan);
  transform:rotate(45deg);
  box-shadow:0 0 14px rgba(53,242,208,.6);
}
.footer__name{
  margin-top:14px;
  font-size:18px;
  font-weight:800;
  letter-spacing:.08em;
  color:var(--mist);
}
.footer__summary{
  margin-top:8px;
  max-width:34ch;
  font-size:13.5px;
  line-height:1.75;
  color:var(--steel);
}
.footer__brand .btn{margin-top:18px}

.footer__cols{
  display:grid;
  gap:22px;
  grid-template-columns:repeat(2,minmax(0,1fr));
}
@media (min-width:560px){
  .footer__cols{grid-template-columns:repeat(3,minmax(0,1fr))}
}
.footer__col{min-width:0}
.footer__col-title{
  padding-bottom:8px;
  margin-bottom:12px;
  border-bottom:1px solid var(--hair);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.24em;
  color:var(--cyan);
}
.footer__list{display:grid;gap:9px}
.footer__link{
  display:inline-block;
  font-size:13.5px;
  color:var(--mist);
  transition:color .16s var(--ease),transform .16s var(--ease);
}
.footer__link:hover{color:var(--cyan);transform:translateX(3px)}
.footer__link[aria-current="page"]{color:var(--cyan)}

.footer__contact{display:grid;gap:12px;align-content:start;min-width:0}
.footer__contact-item{display:grid;gap:3px}
.footer__contact-label{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.22em;
  color:var(--steel);
}
.footer__contact-value{
  font-size:13.5px;
  line-height:1.6;
  color:var(--mist);
  overflow-wrap:anywhere;
}
.footer__contact-value--mono{
  font-family:var(--font-mono);
  letter-spacing:.04em;
  color:var(--orange);
}
.footer__note{
  padding:10px 12px;
  border-left:2px solid var(--turf);
  background:rgba(47,191,113,.08);
  font-size:12px;
  line-height:1.7;
  color:var(--steel);
}

.footer__bottom{
  display:flex;
  flex-wrap:wrap;
  gap:10px 24px;
  align-items:center;
  justify-content:space-between;
  margin-top:clamp(26px,4vw,44px);
  padding-top:16px;
  border-top:1px solid var(--hair);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--steel);
}
.footer__copy,.footer__icp{margin:0}
.footer__icp{color:rgba(230,241,245,.55)}

/* ---------- 7. 通用组件 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 20px;
  border:1px solid var(--hair-cyan);
  border-radius:2px;
  background:rgba(53,242,208,.07);
  color:var(--cyan);
  font-size:13px;
  font-weight:700;
  letter-spacing:.12em;
  line-height:1.2;
  transition:transform .18s var(--ease),background .18s var(--ease),filter .18s var(--ease),color .18s var(--ease);
}
.btn:hover{transform:translateY(-2px);background:rgba(53,242,208,.16)}
.btn--primary{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--ink);
  box-shadow:0 16px 30px -20px rgba(53,242,208,.9);
}
.btn--primary:hover{filter:brightness(1.08);background:var(--cyan)}
.btn--ghost{
  background:transparent;
  border-color:var(--hair);
  color:var(--mist);
}
.btn--ghost:hover{border-color:var(--hair-cyan);color:var(--cyan);background:rgba(53,242,208,.07)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--hair);
  border-radius:999px;
  background:rgba(230,241,245,.05);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  color:var(--mist);
  white-space:nowrap;
}
.tag--turf{
  border-color:rgba(47,191,113,.42);
  background:rgba(47,191,113,.12);
  color:var(--turf);
}
.tag--orange{
  border-color:rgba(255,138,61,.45);
  background:rgba(255,138,61,.12);
  color:var(--orange);
}

.card{
  position:relative;
  padding:clamp(16px,2.4vw,26px);
  border:1px solid var(--hair);
  border-radius:3px;
  background:linear-gradient(170deg,rgba(10,34,56,.94),rgba(6,24,38,.94));
  box-shadow:var(--shadow-soft);
  transition:border-color .18s var(--ease),transform .18s var(--ease);
}
.card:hover{border-color:var(--hair-cyan);transform:translateY(-2px)}
.card > :is(h3,h4){margin-bottom:.4em}

.panel{
  padding:clamp(16px,2.4vw,28px);
  border:1px solid var(--hair);
  border-radius:3px;
  background:rgba(10,34,56,.62);
}

.paper{
  padding:clamp(20px,3.4vw,44px);
  border-radius:3px;
  background:var(--paper);
  color:var(--ink);
  box-shadow:var(--shadow-soft);
}
.paper :is(h1,h2,h3,h4){color:var(--ink)}
.paper a{color:#0b6f60;text-decoration:underline;text-underline-offset:3px}
.prose{max-width:68ch;font-size:16.5px;line-height:1.78}
.prose p + p{margin-top:1em}
.prose :is(h2,h3){margin-top:1.5em;margin-bottom:.5em}
.prose ul,.prose ol{margin-top:.8em;padding-left:1.2em;list-style:disc}
.prose li + li{margin-top:.4em}

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding-block:14px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--steel);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:rgba(230,241,245,.3)}
.breadcrumb a{color:var(--mist)}
.breadcrumb a:hover{color:var(--cyan)}

.media-frame{
  position:relative;
  overflow:hidden;
  border:1px solid var(--hair);
  border-radius:3px;
  background:
    linear-gradient(140deg,var(--sea),var(--teal-ink));
  aspect-ratio:16 / 10;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:8px;
  border:1px solid rgba(230,241,245,.12);
  pointer-events:none;
}
.media-frame__img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:4 / 5}

.legend{
  display:flex;
  flex-wrap:wrap;
  gap:10px 20px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--steel);
}
.legend__item{display:inline-flex;align-items:center;gap:8px}
.legend__dot{
  width:8px;height:8px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 10px rgba(53,242,208,.6);
}
.legend__dot--turf{background:var(--turf);box-shadow:0 0 10px rgba(47,191,113,.55)}
.legend__dot--orange{background:var(--orange);box-shadow:0 0 10px rgba(255,138,61,.55)}

.stat{display:grid;gap:5px}
.stat__value{
  font-family:var(--font-mono);
  font-size:clamp(24px,3vw,34px);
  line-height:1;
  letter-spacing:-.01em;
  color:var(--orange);
}
.stat__label{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.2em;
  color:var(--steel);
}

.filter-bar{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding:10px 0;
}
.filter-bar__label{
  margin-right:4px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.22em;
  color:var(--steel);
}
.filter-btn{
  padding:7px 13px;
  border:1px solid var(--hair);
  border-radius:999px;
  background:rgba(230,241,245,.04);
  color:var(--mist);
  font-size:12px;
  letter-spacing:.08em;
  transition:color .18s var(--ease),border-color .18s var(--ease),background .18s var(--ease);
}
.filter-btn:hover{border-color:var(--hair-cyan);color:var(--cyan)}
.filter-btn[aria-pressed="true"]{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--ink);
  font-weight:700;
}

.note-block{
  padding:12px 16px;
  border-left:2px solid var(--cyan);
  background:rgba(53,242,208,.07);
  font-size:13.5px;
  line-height:1.75;
  color:var(--mist);
}

/* ---------- 8. 动效 ---------- */
.js-reveal [data-reveal]{opacity:0;transform:translateY(16px)}
.js-reveal [data-reveal].is-in{
  opacity:1;
  transform:none;
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}

/* ---------- 9. 响应式与无障碍 ---------- */
@media (max-width:1023px){
  html.is-nav-open,
  html.is-nav-open body{overflow:hidden}
}

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