/* ==========================================================================
   皇冠足球站 · 共享样式表 /assets/site.css
   午夜黑 + 深墨绿底 / 皇冠金强调 / 冷电蓝数据高亮
   ========================================================================== */

/* 1. Reset ---------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{max-width:100%;height:auto;display:block}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
::selection{background:rgba(200,166,86,.35);color:#fff}

/* 2. 变量 ---------------------------------------------------------------- */
:root{
  --ink-black:#070B0E;
  --deep-green:#0C2B22;
  --green-raise:#123B2E;
  --crown-gold:#C8A656;
  --light-gold:#E8D9A0;
  --electric:#3F8CFF;
  --ice:#D7E3EA;
  --mist:#8E9BA3;
  --blue-black:#0A1724;
  --amber:#D98C3F;

  --line:rgba(200,166,86,.26);
  --line-soft:rgba(215,227,234,.13);
  --surface:rgba(18,59,46,.55);

  --font-head:"Oswald","Barlow Condensed","PingFang SC","Source Han Sans SC","Noto Sans SC",-apple-system,"Segoe UI",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --shell:1240px;
  --gutter:clamp(18px,4vw,56px);
  --header-h:76px;
  --rail-h:34px;
  --radius:2px;
  --shadow-micro:0 1px 0 rgba(215,227,234,.04),0 16px 40px -30px rgba(0,0,0,.92);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* 3. 基础 ---------------------------------------------------------------- */
body{
  min-height:100vh;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  color:var(--ice);
  background-color:var(--ink-black);
  background-image:
    radial-gradient(1100px 620px at 84% -10%, rgba(12,43,34,.92), rgba(12,43,34,0) 62%),
    radial-gradient(900px 520px at -12% 14%, rgba(63,140,255,.10), rgba(63,140,255,0) 60%),
    radial-gradient(700px 500px at 50% 120%, rgba(12,43,34,.55), rgba(12,43,34,0) 65%);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--font-head);font-weight:500;letter-spacing:.02em;line-height:1.12;color:#fff}
h1{font-size:clamp(40px,6.4vw,88px);text-transform:uppercase}
h2{font-size:clamp(26px,3.6vw,44px);text-transform:uppercase}
h3{font-size:clamp(19px,2vw,26px)}
strong{color:#fff;font-weight:600}
a{transition:color .25s var(--ease),border-color .25s var(--ease),background-color .25s var(--ease)}
:focus-visible{outline:2px solid var(--electric);outline-offset:3px;border-radius:1px}

#main-content{
  display:block;
  position:relative;
  padding-top:calc(var(--header-h) + var(--rail-h));
  scroll-margin-top:calc(var(--header-h) + var(--rail-h));
}
#main-content.main--flush{padding-top:0}

.is-visually-hidden{
  position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}

.skip-link{
  position:absolute;left:16px;top:12px;z-index:200;
  transform:translateY(-180%);
  padding:10px 16px;border-radius:var(--radius);
  background:linear-gradient(135deg,var(--crown-gold),#A8863B);
  color:#07100C;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;
  transition:transform .25s var(--ease);
}
.skip-link:focus{transform:none}

/* 4. 布局工具 ------------------------------------------------------------ */
.container{width:min(calc(100% - var(--gutter) * 2),var(--shell));margin-inline:auto}
.section{padding-block:clamp(48px,7vw,96px)}
.grid{display:grid;gap:clamp(18px,2.4vw,30px)}
.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))}

/* 5. 按钮与链接 ---------------------------------------------------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  padding:14px 24px;border:1px solid var(--line);border-radius:var(--radius);
  background:transparent;color:var(--ice);
  font-family:var(--font-head);font-size:14px;letter-spacing:.16em;text-transform:uppercase;
  cursor:pointer;transition:color .25s var(--ease),background .25s var(--ease),border-color .25s var(--ease),transform .25s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--gold{
  border-color:transparent;
  background:linear-gradient(135deg,var(--light-gold),var(--crown-gold) 48%,#A8863B);
  color:#07100C;font-weight:600;
  box-shadow:0 14px 30px -22px rgba(200,166,86,.95);
}
.btn--gold:hover{background:linear-gradient(135deg,#fff0c2,var(--crown-gold) 52%,#8F7229)}
.btn--ghost{border-color:var(--line);color:var(--light-gold)}
.btn--ghost:hover{background:rgba(200,166,86,.10);border-color:var(--crown-gold);color:#fff}
.btn--sm{padding:10px 16px;font-size:12.5px;letter-spacing:.14em}

.link-more{
  display:inline-flex;align-items:center;gap:8px;
  padding-bottom:4px;border-bottom:1px solid rgba(200,166,86,.42);
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--light-gold);
}
.link-more::after{content:"→";font-size:13px}
.link-more:hover{color:#fff;border-color:#fff}

/* 6. 卡片与网格组件 ------------------------------------------------------ */
.card{
  position:relative;
  padding:clamp(20px,2.4vw,32px);
  border:1px solid var(--line-soft);border-radius:var(--radius);
  background:linear-gradient(158deg,rgba(18,59,46,.72),rgba(10,23,36,.78));
  box-shadow:var(--shadow-micro);
}
.card::before{
  content:"";position:absolute;left:0;top:0;width:42px;height:1px;
  background:var(--crown-gold);opacity:.75;
}
.card__title{font-family:var(--font-head);font-size:20px;letter-spacing:.04em;margin-bottom:10px;color:#fff}
.card__text{font-size:15.5px;color:rgba(215,227,234,.82);margin-bottom:14px}
.card--blue{border-color:rgba(63,140,255,.3)}
.card--blue::before{background:var(--electric)}

/* 7. 章节头 / 索引 ------------------------------------------------------- */
.section-head{
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:clamp(14px,2vw,30px);
  align-items:end;
  padding-bottom:18px;margin-bottom:clamp(24px,3.4vw,44px);
  border-bottom:1px solid var(--line-soft);
}
.section-head__index{
  font-family:var(--font-mono);font-size:clamp(16px,1.8vw,20px);letter-spacing:.12em;
  color:var(--crown-gold);
}
.section-head__title{margin:0}
.section-head__note{margin-top:8px;font-size:14px;color:var(--mist)}

.kicker{
  display:inline-block;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.24em;text-transform:uppercase;color:var(--crown-gold);
}
.stamp{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--mist)}

/* 8. 标签 / 数据块 ------------------------------------------------------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 11px;border:1px solid var(--line-soft);border-radius:999px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--mist);white-space:nowrap;
}
.tag--gold{color:var(--light-gold);border-color:rgba(200,166,86,.48)}
.tag--blue{color:var(--electric);border-color:rgba(63,140,255,.42)}
.tag--amber{color:var(--amber);border-color:rgba(217,140,63,.46)}

.stat{display:grid;gap:8px;padding:22px 0}
.stat__value{
  font-family:var(--font-mono);font-weight:400;
  font-size:clamp(32px,5vw,54px);line-height:1;letter-spacing:-.01em;color:var(--ice);
}
.stat__value--gold{color:var(--light-gold)}
.stat__value--blue{color:var(--electric)}
.stat__label{font-size:14px;color:rgba(215,227,234,.8)}
.stat__meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--mist)}

/* 9. 正文 / 面包屑 ------------------------------------------------------- */
.prose{max-width:68ch;font-size:17px;line-height:1.78;color:rgba(215,227,234,.88)}
.prose p{margin-bottom:1.1em}
.prose h2{margin:1.6em 0 .6em}
.prose h3{margin:1.4em 0 .5em;color:var(--light-gold)}
.prose ul,.prose ol{list-style:disc;padding-left:1.35em;margin-bottom:1.1em}
.prose ol{list-style:decimal}
.prose li{margin-bottom:.4em}
.prose a{border-bottom:1px solid rgba(200,166,86,.5);color:var(--light-gold)}
.prose a:hover{color:#fff;border-color:#fff}
.prose table{font-size:15px;margin-bottom:1.4em}
.prose th,.prose td{padding:12px 14px;border-bottom:1px solid var(--line-soft);text-align:left}
.prose th{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--light-gold)}

.breadcrumb{margin-bottom:clamp(20px,3vw,34px)}
.breadcrumb__list{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--mist);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:10px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:rgba(200,166,86,.55)}
.breadcrumb__link{color:rgba(215,227,234,.75)}
.breadcrumb__link:hover{color:var(--light-gold)}

/* 10. 图片占位容器（页面阶段放 <img>） ----------------------------------- */
.media{
  position:relative;overflow:hidden;
  border:1px solid var(--line-soft);border-radius:var(--radius);
  background:linear-gradient(150deg,var(--green-raise),var(--blue-black) 70%);
}
.media img{width:100%;height:100%;object-fit:cover;filter:saturate(.62) contrast(1.06) brightness(.94)}
.media--wide{aspect-ratio:16/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media--pitch{aspect-ratio:21/9}
.media__scrim{position:absolute;inset:0;background:linear-gradient(180deg,rgba(7,11,14,0) 34%,rgba(7,11,14,.88))}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;padding:16px 18px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--ice);
}

/* 11. 分段切换 Tabs ------------------------------------------------------ */
.tabs{display:grid;gap:clamp(18px,2.4vw,28px)}
.tabs__list{
  display:inline-flex;flex-wrap:wrap;gap:4px;justify-self:start;
  padding:4px;border:1px solid var(--line-soft);border-radius:999px;
  background:rgba(10,23,36,.6);
}
.tabs__tab{
  appearance:none;border:0;border-radius:999px;cursor:pointer;
  padding:9px 16px;background:transparent;color:var(--mist);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  transition:color .25s var(--ease),background .25s var(--ease);
}
.tabs__tab:hover{color:var(--ice)}
.tabs__tab[aria-selected="true"]{
  background:linear-gradient(135deg,var(--light-gold),var(--crown-gold) 55%,#A8863B);
  color:#07100C;
}
.tabs__panels{position:relative}
.tabs__panel{padding-top:2px}
.tabs__panel[hidden]{display:none}

/* 12. 滚动显现 ----------------------------------------------------------- */
[data-reveal]{
  opacity:0;transform:translateY(18px);
  transition:opacity .7s var(--ease),transform .7s var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* 13. 头部 --------------------------------------------------------------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:80;
  padding-inline:var(--gutter);
  color:var(--ice);
  background:linear-gradient(180deg,rgba(7,11,14,.74),rgba(7,11,14,0));
  transition:background .35s var(--ease),border-color .35s var(--ease),box-shadow .35s var(--ease);
}
.site-header[data-scrolled="true"]{
  background:linear-gradient(180deg,rgba(12,43,34,.96),rgba(7,11,14,.97));
  border-bottom:1px solid var(--line-soft);
  box-shadow:0 22px 48px -40px rgba(0,0,0,.95);
  -webkit-backdrop-filter:blur(16px) saturate(120%);
  backdrop-filter:blur(16px) saturate(120%);
}

.header-rail{
  display:flex;align-items:center;gap:14px;
  height:var(--rail-h);overflow:hidden;
  border-bottom:1px solid var(--line-soft);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--mist);
  transition:height .35s var(--ease),opacity .3s var(--ease),border-color .3s var(--ease);
}
.site-header[data-scrolled="true"] .header-rail{height:0;opacity:0;border-color:transparent}
.header-rail__note{color:var(--light-gold)}
.header-rail__meta{margin-left:auto}
.header-rail__pulse{
  flex:0 0 auto;width:7px;height:7px;border-radius:50%;
  background:var(--crown-gold);
  box-shadow:0 0 0 0 rgba(200,166,86,.6);
  animation:railPulse 2.6s var(--ease) infinite;
}
@keyframes railPulse{
  0%{box-shadow:0 0 0 0 rgba(200,166,86,.55)}
  70%{box-shadow:0 0 0 9px rgba(200,166,86,0)}
  100%{box-shadow:0 0 0 0 rgba(200,166,86,0)}
}

.header-shell{
  position:relative;
  display:flex;align-items:center;gap:clamp(14px,2.4vw,34px);
  height:var(--header-h);
}

.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto}
.brand__mark{position:relative;display:block;width:30px;height:26px;flex:0 0 auto}
.brand__mark i{
  position:absolute;bottom:0;width:6px;border-radius:1px;
  background:linear-gradient(180deg,var(--light-gold),var(--crown-gold) 68%,rgba(200,166,86,.25));
}
.brand__mark i:nth-child(1){left:0;height:13px}
.brand__mark i:nth-child(2){left:9px;height:24px}
.brand__mark i:nth-child(3){left:18px;height:17px}
.brand__mark::after{
  content:"";position:absolute;left:0;right:0;bottom:-6px;height:2px;
  background:linear-gradient(90deg,var(--crown-gold),rgba(200,166,86,0));
}
.brand__text{display:grid;gap:2px}
.brand__name{font-family:var(--font-head);font-size:18px;letter-spacing:.2em;color:#fff}
.brand__line{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.24em;text-transform:uppercase;color:var(--mist)}
.brand:hover .brand__line{color:var(--light-gold)}

.site-nav{flex:1 1 auto;display:flex;justify-content:center}
.site-nav__list{display:flex;align-items:center;gap:clamp(8px,1.6vw,26px)}
.site-nav__link{
  position:relative;display:inline-block;padding:10px 2px;
  font-size:14.5px;letter-spacing:.08em;color:rgba(215,227,234,.82);
}
.site-nav__link::after{
  content:"";position:absolute;left:0;right:100%;bottom:4px;height:1px;
  background:var(--crown-gold);
  transition:right .3s var(--ease),background .3s var(--ease);
}
.site-nav__link:hover,.site-nav__link:focus-visible{color:var(--light-gold)}
.site-nav__link:hover::after{right:0}
.site-nav__link[aria-current="page"]{color:var(--light-gold)}
.site-nav__link[aria-current="page"]::after{
  right:0;background:linear-gradient(90deg,var(--electric),var(--crown-gold));
}

.header-actions{display:flex;align-items:center;gap:12px;flex:0 0 auto;margin-left:auto}
.header-cta{white-space:nowrap}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:10px 13px;border:1px solid var(--line);border-radius:var(--radius);
  background:transparent;color:var(--ice);cursor:pointer;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;
}
.nav-toggle:hover{border-color:var(--crown-gold);color:var(--light-gold)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:5px;width:18px}
.nav-toggle__bar{
  display:block;height:1px;width:100%;background:var(--crown-gold);
  transition:transform .3s var(--ease),opacity .3s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:last-child{transform:translateY(-3px) rotate(-45deg)}

.scroll-progress{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:rgba(215,227,234,.08);
  opacity:0;transition:opacity .3s var(--ease);
}
.site-header[data-scrolled="true"] .scroll-progress{opacity:1}
.scroll-progress__bar{
  display:block;width:100%;height:100%;
  transform:scaleX(0);transform-origin:left center;
  background:linear-gradient(90deg,var(--electric),var(--crown-gold));
}

/* 14. 页脚 --------------------------------------------------------------- */
.site-footer{
  position:relative;
  margin-top:clamp(60px,8vw,120px);
  padding:clamp(44px,6vw,84px) var(--gutter) 0;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(12,43,34,.86),var(--ink-black) 62%);
  color:var(--ice);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(90deg,var(--line-soft) 1px,rgba(0,0,0,0) 1px);
  background-size:calc(100% / 6) 100%;
  opacity:.4;
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.9),rgba(0,0,0,0) 66%);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.9),rgba(0,0,0,0) 66%);
}
.site-footer > *{position:relative;z-index:1}

.footer-grid{
  width:min(100%,var(--shell));margin-inline:auto;
  display:grid;
  grid-template-columns:minmax(0,1.5fr) minmax(0,.8fr) minmax(0,.8fr) minmax(0,1.15fr);
  gap:clamp(26px,3.2vw,54px);
}
.footer-brand__name{font-family:var(--font-head);font-size:22px;letter-spacing:.2em;color:#fff}
.footer-brand__line{
  margin-top:6px;font-family:var(--font-mono);font-size:11.5px;
  letter-spacing:.22em;text-transform:uppercase;color:var(--crown-gold);
}
.footer-brand__summary{margin-top:16px;max-width:38ch;font-size:14.5px;line-height:1.8;color:rgba(215,227,234,.8)}
.footer-brand__meta{
  margin-top:16px;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.1em;color:var(--mist);
}

.footer-col__title{
  margin:0 0 16px;font-family:var(--font-head);font-size:13.5px;
  letter-spacing:.22em;text-transform:uppercase;color:var(--light-gold);
}
.footer-col__list{display:grid;gap:10px}
.footer-col__list a{
  position:relative;display:inline-block;font-size:14.5px;color:rgba(215,227,234,.78);
}
.footer-col__list a::after{
  content:"";position:absolute;left:0;right:100%;bottom:-2px;height:1px;
  background:var(--crown-gold);transition:right .3s var(--ease);
}
.footer-col__list a:hover{color:var(--light-gold)}
.footer-col__list a:hover::after{right:0}

.footer-contact{display:grid;gap:14px}
.footer-contact__label{
  display:block;margin-bottom:3px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--crown-gold);
}
.footer-contact__value{display:block;font-size:14px;line-height:1.65;color:rgba(215,227,234,.9);word-break:break-word}
.footer-contact__note{margin-top:14px;font-size:12.5px;line-height:1.75;color:var(--mist)}

.footer-base{
  width:min(100%,var(--shell));margin:clamp(34px,4vw,62px) auto 0;
  padding:20px 0 34px;border-top:1px solid var(--line-soft);
  display:flex;flex-wrap:wrap;gap:10px 26px;justify-content:space-between;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--mist);
}
.footer-base__legal{color:rgba(215,227,234,.72)}
.footer-base__meta{color:var(--mist)}

/* 15. 响应式 ------------------------------------------------------------- */
@media (max-width:1080px){
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}

@media (max-width:940px){
  :root{--header-h:66px}
  .header-cta{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;top:calc(100% + 10px);left:0;right:0;
    display:block;
    padding:10px 18px;
    border:1px solid var(--line);border-radius:var(--radius);
    background:linear-gradient(180deg,rgba(12,43,34,.98),rgba(7,11,14,.99));
    box-shadow:0 34px 70px -34px rgba(0,0,0,.98);
    -webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
    max-height:calc(100vh - 150px);overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-10px);pointer-events:none;
    transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s var(--ease);
  }
  .site-nav[data-open="true"]{opacity:1;visibility:visible;transform:none;pointer-events:auto}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;counter-reset:navItem}
  .site-nav__item{
    display:flex;align-items:center;gap:14px;
    border-bottom:1px solid var(--line-soft);
    counter-increment:navItem;
  }
  .site-nav__item:last-child{border-bottom:0}
  .site-nav__item::before{
    content:counter(navItem,decimal-leading-zero);
    font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--crown-gold);
    min-width:22px;
  }
  .site-nav__link{flex:1;padding:15px 0;font-size:16px}
  .site-nav__link::after{display:none}
}

@media (max-width:820px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .brand__line{display:none}
  .section-head{grid-template-columns:minmax(0,1fr);gap:8px}
  .tabs__list{width:100%;justify-content:flex-start;border-radius:var(--radius)}
  .tabs__tab{flex:1 1 auto;text-align:center}
}

@media (max-width:640px){
  body{font-size:16px;background-attachment:scroll}
  .header-rail{font-size:10.5px;letter-spacing:.1em;gap:10px}
  .header-rail__meta{display:none}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:30px}
  .footer-base{flex-direction:column;align-items:flex-start}
  .media--pitch{aspect-ratio:16/9}
}

/* 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;
  }
  [data-reveal]{opacity:1!important;transform:none!important}
  .btn:hover{transform:none}
}