/* ==========================================================================
   亚新赛场 yaxin-sprint.com.cn — shared site.css
   高原赛场 × 数据仪表盘：夜赛道深蓝底、青海湖蓝承重、青稞金索引、熔岩橙脉冲
   ========================================================================== */

:root{
  --lake-blue:#0B5C8A;
  --night-blue:#071C2B;
  --barley-gold:#D9A620;
  --lava-orange:#FF5A1F;
  --electric-teal:#1FD1C0;
  --graphite:#2A2E33;
  --ice-blue:#CFE3F0;
  --snow:#F7F8F9;
  --fog:#6E767D;

  --font-display:"Oswald","Archivo Narrow","PingFang SC","Source Han Sans SC",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,"SFMono-Regular",monospace;
  --font-body:"Source Han Sans SC","PingFang SC","Noto Sans SC",system-ui,sans-serif;

  --maxw:1280px;
  --gutter:24px;
  --header-pad:18px;
  --hard-shadow:10px 10px 0 var(--night-blue);
  --ease:cubic-bezier(.2,.7,.2,1);
}

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--snow);
  color:var(--graphite);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
h1,h2,h3,h4,h5,h6{
  margin:0;
  font-family:var(--font-display);
  font-weight:700;
  letter-spacing:-.01em;
  line-height:1.08;
  color:var(--night-blue);
}
p{margin:0 0 1.1em}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
img,svg,video{max-width:100%;display:block}
figure{margin:0}
table{border-collapse:collapse;width:100%}
input,select,textarea{font:inherit;color:inherit}
::selection{background:var(--barley-gold);color:var(--night-blue)}

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

#main-content{scroll-margin-top:96px}

/* ---------- 2. 通用容器与章节 ---------- */
.container{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--gutter);
}
.section{padding:84px 0}
.section--tight{padding:52px 0}
.section--dark{
  background:var(--night-blue);
  color:var(--ice-blue);
}
.section--dark h1,.section--dark h2,.section--dark h3{color:var(--snow)}

.section-title{
  font-family:var(--font-display);
  font-size:clamp(32px,5vw,56px);
  font-weight:700;
  letter-spacing:-.01em;
  line-height:1.04;
  color:var(--night-blue);
  margin:12px 0 20px;
}

.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(--barley-gold);
}
.eyebrow::before{
  content:"";
  width:22px;
  height:2px;
  background:currentColor;
  flex:none;
}

.lede{
  font-size:19px;
  line-height:1.72;
  color:var(--graphite);
  max-width:64ch;
}
.muted{color:var(--fog)}

.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.06em;
  color:var(--barley-gold);
}

.aside-note{
  font-size:14px;
  line-height:1.72;
  color:var(--fog);
  border-left:2px solid var(--ice-blue);
  padding-left:14px;
}

/* ---------- 3. 堆叠面板 ---------- */
.panel{
  background:var(--snow);
  border:3px solid var(--graphite);
  box-shadow:var(--hard-shadow);
  padding:32px;
}
.panel--dark{
  background:var(--night-blue);
  color:var(--ice-blue);
  border-color:var(--night-blue);
  box-shadow:10px 10px 0 var(--barley-gold);
}
.panel--dark h2,.panel--dark h3{color:var(--snow)}
.panel--gold{box-shadow:10px 10px 0 var(--barley-gold)}

/* ---------- 4. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:9px;
  min-height:46px;
  padding:13px 24px;
  font-family:var(--font-display);
  font-size:15px;
  font-weight:700;
  letter-spacing:.07em;
  border:2px solid transparent;
  transition:background .2s var(--ease),color .2s var(--ease),
             transform .16s var(--ease),box-shadow .16s var(--ease),
             border-color .2s var(--ease);
}
.btn--primary{background:var(--lava-orange);color:var(--snow);border-color:var(--lava-orange)}
.btn--primary:hover{background:#e04b12;box-shadow:5px 5px 0 var(--night-blue);transform:translate(-2px,-2px)}
.btn--ghost{background:transparent;color:var(--lake-blue);border-color:var(--lake-blue)}
.btn--ghost:hover{background:var(--lake-blue);color:var(--snow);box-shadow:5px 5px 0 var(--barley-gold);transform:translate(-2px,-2px)}
.btn--gold{background:var(--barley-gold);color:var(--night-blue);border-color:var(--barley-gold)}
.btn--gold:hover{box-shadow:5px 5px 0 var(--graphite);transform:translate(-2px,-2px)}
.btn:active{transform:translate(1px,1px)}

/* ---------- 5. 面包屑 ---------- */
.breadcrumb{
  padding:20px 0;
  border-bottom:1px solid var(--ice-blue);
  margin-bottom:44px;
}
.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--fog);
}
.breadcrumb li{display:flex;align-items:center;gap:10px}
.breadcrumb li + li::before{content:"/";color:var(--barley-gold)}
.breadcrumb a{color:var(--lake-blue)}
.breadcrumb a:hover{text-decoration:underline}
.breadcrumb [aria-current="page"]{color:var(--graphite)}

/* ---------- 6. 栅格 ---------- */
.grid{display:grid;gap:var(--gutter)}
.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))}
.grid--split{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}

/* ---------- 7. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  background:linear-gradient(135deg,var(--night-blue) 0%,#123c56 100%);
  border:3px solid var(--night-blue);
  aspect-ratio:16 / 10;
}
.media-frame > img{
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform .5s var(--ease);
}
.media-frame:hover > img{transform:scale(1.03)}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame--overlay::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(7,28,43,0) 42%,rgba(7,28,43,.78) 100%);
  pointer-events:none;
}
.media-caption{
  position:absolute;
  left:18px;
  right:18px;
  bottom:16px;
  z-index:2;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--snow);
}

/* ---------- 8. 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--snow);
  border-bottom:3px solid var(--graphite);
  transition:border-color .24s var(--ease);
}
.site-header[data-scrolled]{border-bottom-color:var(--barley-gold)}

.header-inner{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:var(--header-pad) 24px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:36px;
  transition:padding .26s var(--ease);
}
.site-header[data-scrolled] .header-inner{--header-pad:10px}

.skip-link{
  position:absolute;
  left:18px;
  top:-120px;
  z-index:200;
  padding:12px 22px;
  background:var(--night-blue);
  color:var(--snow);
  font-family:var(--font-display);
  font-size:15px;
  font-weight:700;
  letter-spacing:.07em;
  border:3px solid var(--barley-gold);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:14px}

.brand-block{
  display:flex;
  align-items:baseline;
  gap:16px;
  min-width:0;
  flex:0 1 auto;
}
.brand-mark{
  display:flex;
  align-items:baseline;
  gap:12px;
  min-width:0;
}
.brand-name{
  font-family:var(--font-display);
  font-weight:700;
  font-size:25px;
  letter-spacing:.09em;
  color:var(--night-blue);
  white-space:nowrap;
  transition:font-size .26s var(--ease);
}
.site-header[data-scrolled] .brand-name{font-size:21px}
.brand-domain{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--fog);
  white-space:nowrap;
}
.brand-coord{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--lava-orange);
  white-space:nowrap;
  overflow:hidden;
  max-width:0;
  opacity:0;
  border-left:2px solid var(--barley-gold);
  padding-left:0;
  transition:opacity .2s var(--ease),max-width .28s var(--ease),padding-left .28s var(--ease);
}
.site-header[data-scrolled] .brand-coord{
  opacity:1;
  max-width:220px;
  padding-left:12px;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  min-height:46px;
  min-width:46px;
  padding:10px 14px;
  border:2px solid var(--graphite);
  background:var(--snow);
  color:var(--graphite);
  transition:background .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{background:var(--night-blue);color:var(--snow);border-color:var(--night-blue)}
.nav-toggle-bars{
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:4px;
  width:22px;
  flex:none;
}
.nav-toggle-bar{
  display:block;
  width:100%;
  height:2px;
  background:currentColor;
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle-text{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.site-nav{
  display:flex;
  align-items:center;
  gap:34px;
  flex:0 1 auto;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:26px;
  flex-wrap:nowrap;
}
.nav-list a{
  position:relative;
  display:inline-block;
  padding:7px 2px;
  font-size:15px;
  font-weight:500;
  letter-spacing:.02em;
  color:var(--graphite);
  white-space:nowrap;
  transition:color .18s var(--ease);
}
.nav-list a::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:var(--barley-gold);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .22s var(--ease),background .18s var(--ease);
}
.nav-list a:hover{color:var(--lake-blue)}
.nav-list a:hover::after{transform:scaleX(1)}
.nav-list a[aria-current="page"]{color:var(--lake-blue);font-weight:700}
.nav-list a[aria-current="page"]::after{transform:scaleX(1);background:var(--lava-orange)}

.nav-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:11px 20px;
  border:2px solid var(--lava-orange);
  color:var(--lava-orange);
  font-family:var(--font-display);
  font-size:15px;
  font-weight:700;
  letter-spacing:.07em;
  white-space:nowrap;
  transition:background .2s var(--ease),color .2s var(--ease),
             transform .16s var(--ease),box-shadow .16s var(--ease);
}
.nav-cta:hover{
  background:var(--lava-orange);
  color:var(--snow);
  transform:translate(-2px,-2px);
  box-shadow:4px 4px 0 var(--night-blue);
}

/* ---------- 9. 页脚 ---------- */
.site-footer{
  margin-top:104px;
  background:var(--night-blue);
  color:var(--ice-blue);
  border-top:6px solid var(--barley-gold);
}
.footer-inner{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--gutter);
}
.footer-top{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:14px 40px;
  padding:56px 0 32px;
}
.footer-brand{
  display:flex;
  align-items:baseline;
  gap:14px;
  flex-wrap:wrap;
}
.footer-brand-name{
  font-family:var(--font-display);
  font-size:30px;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--snow);
}
.footer-brand-domain{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--barley-gold);
}
.footer-tagline{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--fog);
}

.footer-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  border-top:1px solid rgba(217,166,32,.34);
  border-bottom:1px solid rgba(217,166,32,.34);
}
.footer-col{
  padding:34px 28px 40px;
  border-right:1px solid rgba(217,166,32,.26);
}
.footer-col:first-child{padding-left:0}
.footer-col:last-child{border-right:0;padding-right:0}

.footer-col-title{
  display:block;
  margin-bottom:18px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--barley-gold);
}
.footer-text{
  margin:0 0 16px;
  font-size:15px;
  line-height:1.72;
  color:var(--ice-blue);
}
.footer-links a{
  display:block;
  padding:6px 0;
  font-size:15px;
  color:var(--ice-blue);
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.footer-links a:hover{
  color:var(--barley-gold);
  transform:translateX(4px);
}
.footer-contact{
  margin:0 0 8px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.04em;
  color:var(--ice-blue);
  word-break:break-word;
}

.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 28px;
  padding:24px 0 36px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--fog);
}
.footer-icp{color:var(--ice-blue)}

/* ---------- 10. 滚动进度条与显现 ---------- */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:3px;
  z-index:120;
  pointer-events:none;
  background:linear-gradient(90deg,var(--barley-gold),var(--lava-orange),var(--electric-teal));
  transform:scaleX(0);
  transform-origin:0 50%;
}

.has-js [data-reveal]{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}
.has-js [data-reveal].is-revealed{
  opacity:1;
  transform:none;
}

/* ---------- 11. 平板 ---------- */
@media (max-width:1024px){
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--split{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-col{padding:30px 24px 34px}
  .footer-col:nth-child(2n){border-right:0;padding-right:0}
  .footer-col:nth-child(2n+1){padding-left:0}
  .footer-col:nth-child(n+3){border-top:1px solid rgba(217,166,32,.26)}
}

/* ---------- 12. 移动端 ---------- */
@media (max-width:900px){
  .header-inner{padding:14px 20px;gap:16px}
  .site-header[data-scrolled] .header-inner{padding:10px 20px}
  .brand-domain{display:none}
  .brand-coord{display:none}
  .nav-toggle{display:inline-flex}

  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:8px 0 26px;
    max-height:78vh;
    overflow-y:auto;
    background:var(--night-blue);
    border-bottom:4px solid var(--lava-orange);
    box-shadow:0 18px 0 rgba(7,28,43,.14);
    opacity:0;
    visibility:hidden;
    pointer-events:none;
    transform:translateY(-8px);
    transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s;
    z-index:70;
  }
  .site-nav[data-open]{
    opacity:1;
    visibility:visible;
    pointer-events:auto;
    transform:translateY(0);
  }
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    width:100%;
    flex-wrap:wrap;
  }
  .nav-list li{border-bottom:1px solid rgba(207,227,240,.14)}
  .nav-list a{
    display:flex;
    align-items:center;
    min-height:56px;
    padding:14px 24px;
    font-family:var(--font-display);
    font-size:17px;
    letter-spacing:.05em;
    color:var(--ice-blue);
    white-space:normal;
  }
  .nav-list a::after{display:none}
  .nav-list a:hover{color:var(--snow);background:rgba(11,92,138,.35)}
  .nav-list a[aria-current="page"]{
    color:var(--barley-gold);
    background:rgba(11,92,138,.22);
    box-shadow:inset 4px 0 0 var(--lava-orange);
  }
  .nav-cta{
    margin:22px 24px 0;
    min-height:52px;
    font-size:16px;
    background:var(--lava-orange);
    color:var(--snow);
  }
  .nav-cta:hover{transform:none;box-shadow:none;background:#e04b12}

  .section{padding:60px 0}
  .section--tight{padding:40px 0}
  .panel{padding:24px;box-shadow:6px 6px 0 var(--night-blue)}
  .panel--dark{box-shadow:6px 6px 0 var(--barley-gold)}
  .site-footer{margin-top:72px}
}

@media (max-width:640px){
  body{font-size:16px}
  .container{padding:0 18px}
  .footer-inner{padding:0 18px}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-col{
    padding:26px 0 30px;
    border-right:0;
    border-top:1px solid rgba(217,166,32,.26);
  }
  .footer-col:first-child{border-top:0;padding-top:8px}
  .footer-top{padding:44px 0 24px}
  .footer-brand-name{font-size:24px}
  .footer-legal{flex-direction:column;align-items:flex-start;gap:8px}
  .brand-name{font-size:21px}
}

/* ---------- 13. 降级动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  .media-frame:hover > img{transform:none}
}