/* ===========================================================
   亚盈CN · 共享站点样式  /assets/site.css
   高原暮色 + 技术蓝图：立轨呼号导航、双层信息头、山脊页脚
   =========================================================== */

/* ---------- 1. tokens ---------- */
:root{
  --ink-900:#0A1730;
  --ink-800:#102A4C;
  --ink-700:#173A5E;
  --line:#5C7592;
  --hair:rgba(92,117,146,.34);
  --hair-soft:rgba(92,117,146,.18);
  --teal:#2FB6A6;
  --teal-soft:#7AD8CB;
  --ochre:#C68A3A;
  --gold:#E8B86D;
  --paper:#F2EFE6;
  --shade:#1A1F2B;

  --sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:"JetBrains Mono","SFMono-Regular",Consolas,"Courier New",monospace;

  --rail-w:88px;
  --topbar-h:56px;
  --gutter:clamp(18px,4.5vw,56px);
  --measure:1180px;
  --radius:3px;
  --p:0;
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  padding-left:var(--rail-w);
  padding-top:var(--topbar-h);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.8;
  font-weight:400;
  color:var(--paper);
  background-color:var(--ink-900);
  background-image:
    repeating-linear-gradient(90deg, rgba(92,117,146,.13) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, rgba(92,117,146,.09) 0 1px, transparent 1px 96px);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
main{display:block}
img,svg{max-width:100%;height:auto}
ul,ol{margin:0 0 1.1em;padding-left:1.2em}
figure{margin:0}
dl,dd{margin:0}
button{font:inherit}

/* ---------- 3. base typography ---------- */
h1,h2,h3,h4,h5,h6{
  margin:0 0 .62em;
  font-family:var(--sans);
  font-weight:800;
  line-height:1.15;
  color:var(--paper);
}
h1{font-size:clamp(34px,6vw,66px);letter-spacing:.1em}
h2{font-size:clamp(24px,3.4vw,38px);letter-spacing:.08em}
h3{font-size:clamp(19px,2.2vw,25px);letter-spacing:.06em}
h4{font-size:clamp(16px,1.7vw,19px);letter-spacing:.05em;font-weight:700}
p{margin:0 0 1.1em}
p:last-child{margin-bottom:0}
a{color:var(--teal-soft);text-decoration:none;transition:color .18s ease,border-color .18s ease,background-color .18s ease}
a:hover{color:var(--paper)}
strong{font-weight:700;color:var(--paper)}
::selection{background:rgba(47,182,166,.32);color:var(--paper)}

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

/* ---------- 4. layout helpers ---------- */
.container{
  width:min(100% - (var(--gutter) * 2), var(--measure));
  margin-inline:auto;
}
.section{padding-block:clamp(48px,7vw,104px)}
.section--tight{padding-block:clamp(26px,4vw,52px)}
.section--alt{
  background:var(--ink-800);
  border-block:1px solid var(--hair);
}
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr))}
.stack{display:flex;flex-direction:column;gap:clamp(12px,1.8vw,20px)}
.hairline{height:1px;border:0;background:var(--hair);margin:0}

/* ---------- 5. editorial atoms ---------- */
.eyebrow{
  display:flex;align-items:center;gap:10px;
  margin:0 0 14px;
  font-family:var(--mono);
  font-size:12px;letter-spacing:.26em;text-transform:uppercase;
  color:var(--teal);
}
.eyebrow::before{content:"";width:28px;height:1px;background:var(--ochre);flex:none}
.mono-label{font-family:var(--mono);font-size:12px;letter-spacing:.18em;color:var(--line)}
.lede{
  max-width:60ch;
  font-size:clamp(17px,2vw,20px);
  line-height:1.8;
  color:rgba(242,239,230,.88);
}
.note{
  font-family:var(--mono);
  font-size:12.5px;line-height:1.75;letter-spacing:.02em;
  color:var(--line);
}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;
  color:rgba(242,239,230,.88);
  background:rgba(23,58,94,.55);
  border:1px solid var(--hair);
  border-radius:2px;
}
.tag--teal{border-color:rgba(47,182,166,.5);color:var(--teal-soft)}
.tag--gold{border-color:rgba(198,138,58,.55);color:var(--gold)}

/* ---------- 6. buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:12px 18px;
  font-family:var(--sans);font-size:14px;font-weight:700;
  letter-spacing:.1em;line-height:1;
  text-decoration:none;
  border:1px solid transparent;
  border-radius:var(--radius);
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn--sm{font-size:12px;padding:9px 14px;letter-spacing:.12em}
.btn--solid{background:var(--teal);color:#04140F;border-color:var(--teal)}
.btn--solid:hover{background:var(--teal-soft);color:#04140F}
.btn--gold{background:var(--ochre);color:#170F05;border-color:var(--ochre)}
.btn--gold:hover{background:var(--gold);color:#170F05}
.btn--ghost{background:transparent;color:var(--paper);border-color:var(--hair)}
.btn--ghost:hover{background:rgba(47,182,166,.1);color:var(--teal-soft);border-color:var(--teal)}

/* ---------- 7. breadcrumbs ---------- */
.breadcrumbs{margin:0 0 clamp(18px,3vw,30px)}
.breadcrumbs__list{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  list-style:none;margin:0;padding:0;
  font-family:var(--mono);font-size:12px;letter-spacing:.1em;
  color:var(--line);
}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs__item[aria-current="page"]{color:var(--paper)}
.breadcrumbs__link{color:var(--line);border-bottom:1px solid transparent}
.breadcrumbs__link:hover{color:var(--teal-soft);border-bottom-color:var(--teal)}
.breadcrumbs__sep{color:rgba(92,117,146,.7)}

/* ---------- 8. media containers ---------- */
.media{
  position:relative;
  margin:0;
  overflow:hidden;
  isolation:isolate;
  border:1px solid var(--hair);
  border-radius:var(--radius);
  background:linear-gradient(150deg,var(--ink-700),var(--ink-800));
}
.media__img{
  display:block;width:100%;height:100%;
  object-fit:cover;
  filter:saturate(.82) contrast(1.02);
}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--wide{aspect-ratio:21/9}
.media--blueprint{
  background-image:
    repeating-linear-gradient(90deg, rgba(92,117,146,.24) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(0deg, rgba(92,117,146,.16) 0 1px, transparent 1px 32px);
}
.media--grain::after{
  content:"";
  position:absolute;inset:0;
  pointer-events:none;
  background-image:radial-gradient(rgba(242,239,230,.5) .5px, transparent .5px);
  background-size:3px 3px;
  opacity:.12;
  mix-blend-mode:overlay;
}
.media__caption{
  margin-top:10px;
  font-family:var(--mono);font-size:12px;letter-spacing:.05em;
  color:var(--line);
}

/* ---------- 9. skip link ---------- */
.skip-link{
  position:absolute;left:10px;top:10px;z-index:200;
  padding:10px 16px;
  font-size:14px;font-weight:700;letter-spacing:.04em;
  color:#170F05;background:var(--gold);
  border-radius:var(--radius);
  text-decoration:none;
  pointer-events:auto;
  transform:translateY(-180%);
  transition:transform .18s ease;
}
.skip-link:focus{transform:translateY(0);color:#170F05}

/* ---------- 10. header ---------- */
.site-header{
  position:fixed;
  inset:0;
  z-index:80;
  pointer-events:none;
}

/* 上层：品牌说明横带 */
.header-topbar{
  position:absolute;
  top:0;left:var(--rail-w);right:0;
  height:var(--topbar-h);
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:0 clamp(20px,4vw,48px);
  background:rgba(16,42,76,.94);
  border-bottom:1px solid var(--hair);
  pointer-events:auto;
}
.topbar-line{
  display:flex;align-items:center;gap:10px;
  margin:0;
  font-size:13px;letter-spacing:.16em;
  color:rgba(242,239,230,.82);
}
.topbar-mark{color:var(--gold);font-size:12px;line-height:1}
.header-cta{white-space:nowrap;flex:none}

/* 下层：左侧呼号立轨 */
.rail{
  position:absolute;
  top:0;left:0;bottom:0;
  width:var(--rail-w);
  display:flex;flex-direction:column;align-items:stretch;
  gap:16px;
  padding:16px 0 20px;
  background:var(--ink-800);
  border-right:1px solid var(--hair);
  pointer-events:auto;
  overflow-y:auto;
  scrollbar-width:thin;
}
.rail-brand{
  display:flex;flex-direction:column;align-items:center;gap:3px;
  margin:0 12px;
  padding:4px 0 13px;
  border-bottom:1px solid var(--hair);
  color:var(--paper);
  text-decoration:none;
  transition:color .18s ease;
}
.rail-brand:hover{color:var(--gold)}
.rail-brand__cn{
  font-size:22px;font-weight:800;line-height:1.1;letter-spacing:.1em;
}
.rail-brand__mark{
  font-family:var(--mono);font-size:10px;letter-spacing:.3em;
  color:var(--teal);
}
.rail-brand:hover .rail-brand__mark{color:var(--gold)}

/* 导航：纵向索引 */
.site-nav{display:block}
.site-nav__list{
  display:flex;flex-direction:column;gap:2px;
  list-style:none;margin:0;padding:0;
}
.site-nav__link{
  display:flex;flex-direction:column;align-items:center;gap:2px;
  padding:9px 4px;
  font-size:13px;line-height:1.3;letter-spacing:.06em;
  color:rgba(242,239,230,.76);
  text-decoration:none;
  border-left:2px solid transparent;
  transition:color .18s ease,background-color .18s ease,border-color .18s ease;
}
.site-nav__index{
  font-family:var(--mono);font-size:9px;letter-spacing:.14em;
  color:var(--line);
  transition:color .18s ease;
}
.site-nav__label{display:inline-block}
.site-nav__link:hover{color:var(--teal-soft);background:rgba(47,182,166,.1)}
.site-nav__link:hover .site-nav__index{color:var(--teal-soft)}
.site-nav__link[aria-current="page"]{
  color:var(--gold);
  background:rgba(198,138,58,.14);
  border-left-color:var(--ochre);
}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--gold)}

.rail-meta{
  margin:auto 0 0;
  padding:0 10px;
  font-family:var(--mono);font-size:10px;line-height:1.7;letter-spacing:.1em;
  text-align:center;
  color:rgba(92,117,146,.9);
}

/* 滚动进度尺（桌面纵向） */
.rail-progress{
  position:absolute;top:0;right:0;bottom:0;
  width:2px;
  background:rgba(92,117,146,.22);
  pointer-events:none;
}
.rail-progress__bar{
  display:block;width:100%;height:100%;
  transform:scaleY(var(--p,0));
  transform-origin:top center;
  background:linear-gradient(180deg,var(--teal),var(--gold));
}

/* 移动端开关 */
.nav-toggle{
  display:none;
  align-items:center;gap:10px;
  padding:9px 14px;
  font-size:13px;letter-spacing:.14em;
  color:var(--paper);
  background:transparent;
  border:1px solid var(--line);
  border-radius:var(--radius);
  cursor:pointer;
  transition:border-color .18s ease,color .18s ease,background-color .18s ease;
}
.nav-toggle:hover{border-color:var(--teal);color:var(--teal-soft);background:rgba(47,182,166,.08)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px;flex:none}
.nav-toggle__bars span{
  display:block;height:1.5px;width:100%;
  background:currentColor;
  transition:transform .18s ease,opacity .18s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(4.5px) 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(-4.5px) rotate(-45deg)}
.nav-toggle__label{line-height:1}

/* ---------- 11. footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,10vw,128px);
  background:var(--ink-800);
  border-top:1px solid var(--hair);
  color:rgba(242,239,230,.84);
  overflow:hidden;
}
.footer-ridge{
  height:clamp(44px,7vw,84px);
  background:linear-gradient(180deg,rgba(47,182,166,.22),rgba(23,58,94,.04));
  clip-path:polygon(0% 100%,0% 64%,7% 46%,14% 60%,23% 32%,32% 54%,41% 40%,52% 58%,61% 34%,71% 56%,80% 42%,89% 60%,96% 48%,100% 56%,100% 100%);
}
.footer-inner{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,1.5fr) minmax(0,.95fr);
  gap:clamp(28px,4vw,56px);
  align-items:start;
  padding-block:clamp(36px,5vw,64px);
}
.footer-lead{min-width:0}
.footer-brand{
  display:inline-block;
  font-size:26px;font-weight:800;letter-spacing:.14em;
  color:var(--paper);
  text-decoration:none;
}
.footer-brand:hover{color:var(--gold)}
.footer-brand__suffix{
  margin-left:.5em;
  font-family:var(--mono);font-size:13px;letter-spacing:.28em;
  color:var(--ochre);
}
.footer-summary{
  max-width:34ch;
  margin:14px 0 20px;
  font-size:15px;line-height:1.8;
  color:rgba(242,239,230,.78);
}
.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,2.5vw,32px);
}
.footer-col{min-width:0}
.footer-col__title{
  margin:0 0 14px;
  font-family:var(--mono);font-size:11.5px;font-weight:500;
  letter-spacing:.24em;text-transform:uppercase;
  color:var(--teal);
}
.footer-links{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.footer-link{
  display:inline-block;
  padding-block:4px;
  font-size:15px;
  color:rgba(242,239,230,.78);
  border-bottom:1px solid transparent;
}
.footer-link:hover{color:var(--paper);border-bottom-color:var(--teal)}
.footer-contact{
  min-width:0;
  padding-left:clamp(16px,2vw,28px);
  border-left:1px solid var(--hair);
}
.footer-contact__list{display:grid;gap:12px;margin:0 0 4px}
.footer-contact__row{
  display:grid;grid-template-columns:auto minmax(0,1fr);
  gap:12px;align-items:baseline;
}
.footer-contact__row dt{
  font-family:var(--mono);font-size:11px;letter-spacing:.18em;
  color:var(--line);
}
.footer-contact__row dd{
  font-size:14px;line-height:1.65;
  color:rgba(242,239,230,.86);
  overflow-wrap:anywhere;
}
.footer-mono{font-family:var(--mono);font-size:13px;letter-spacing:.02em}
.copy-btn{
  display:inline-flex;align-items:center;gap:8px;
  margin-top:16px;
  padding:8px 12px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.14em;
  color:var(--gold);
  background:transparent;
  border:1px dashed rgba(198,138,58,.6);
  border-radius:2px;
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.copy-btn:hover{background:rgba(198,138,58,.14);border-color:var(--gold);color:var(--gold)}
.copy-btn[data-state="done"]{border-style:solid;border-color:var(--teal);color:var(--teal-soft);background:rgba(47,182,166,.12)}
.copy-btn[data-state="error"]{border-style:solid;border-color:var(--line);color:var(--paper)}
.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;
  margin-top:clamp(24px,4vw,44px);
  padding-block:20px 32px;
  border-top:1px solid var(--hair-soft);
}
.footer-note{
  margin:0;
  max-width:62ch;
  font-family:var(--mono);font-size:12px;line-height:1.75;
  letter-spacing:.02em;
  color:var(--line);
}
.footer-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  margin:0;
  font-family:var(--mono);font-size:12px;letter-spacing:.06em;
  color:rgba(242,239,230,.78);
}
.footer-meta__sep{color:rgba(92,117,146,.75)}

/* ---------- 12. tablet / mobile ---------- */
@media (max-width:1023px){
  body{
    padding-left:0;
    padding-top:0;
    background-attachment:scroll;
    background-image:
      repeating-linear-gradient(90deg, rgba(92,117,146,.1) 0 1px, transparent 1px 64px),
      repeating-linear-gradient(0deg, rgba(92,117,146,.07) 0 1px, transparent 1px 64px);
  }
  .site-header{
    position:sticky;
    inset:auto;
    top:0;
    width:auto;
    pointer-events:auto;
    background:var(--ink-900);
    border-bottom:1px solid var(--hair);
  }
  .header-topbar{
    position:static;
    height:auto;
    padding:7px var(--gutter);
    background:var(--ink-800);
    border-bottom:1px solid var(--hair-soft);
  }
  .topbar-line{font-size:11.5px;letter-spacing:.12em}
  .header-cta{font-size:11px;padding:7px 10px;letter-spacing:.08em}

  .rail{
    position:relative;
    inset:auto;
    width:auto;
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    padding:10px var(--gutter) 12px;
    border-right:0;
    overflow:visible;
  }
  .rail-brand{
    flex-direction:row;align-items:baseline;gap:7px;
    margin:0;padding:0;border-bottom:0;
  }
  .rail-brand__cn{font-size:18px;letter-spacing:.08em}
  .rail-brand__mark{font-size:9px;letter-spacing:.24em}
  .rail-meta{display:none}
  .nav-toggle{display:inline-flex}

  .site-nav{
    position:absolute;
    top:100%;left:0;right:0;
    display:none;
    max-height:calc(100dvh - 120px);
    overflow-y:auto;
    padding:6px var(--gutter) 18px;
    background:var(--ink-800);
    border-bottom:1px solid var(--hair);
    box-shadow:0 24px 44px rgba(10,23,48,.6);
  }
  .site-nav[data-open]{display:block}
  .site-nav__list{gap:0;flex-direction:column}
  .site-nav__link{
    flex-direction:row;align-items:baseline;gap:14px;
    padding:14px 4px;
    font-size:16px;letter-spacing:.08em;
    border-left:0;
    border-bottom:1px solid var(--hair-soft);
  }
  .site-nav__index{font-size:11px;letter-spacing:.16em}
  .site-nav__link[aria-current="page"]{
    border-left:0;
    border-bottom-color:var(--ochre);
    background:rgba(198,138,58,.12);
  }
  .rail-progress{
    top:auto;left:0;right:0;bottom:0;
    width:auto;height:2px;
  }
  .rail-progress__bar{
    width:100%;height:100%;
    transform:scaleX(var(--p,0));
    transform-origin:left center;
  }

  .footer-inner{grid-template-columns:1fr 1fr}
  .footer-lead{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1;padding-left:0;border-left:0;border-top:1px solid var(--hair-soft);padding-top:clamp(20px,3vw,28px)}
}

@media (max-width:639px){
  body{font-size:16px}
  .grid--12{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr}
  .footer-nav{grid-template-columns:1fr 1fr}
  .footer-base{flex-direction:column;align-items:flex-start}
  .nav-toggle{padding:8px 11px;font-size:12px}
  .header-cta{display:none}
}

@media (min-width:1024px) and (max-width:1279px){
  :root{--rail-w:80px}
  .site-nav__link{font-size:12.5px}
}

/* ---------- 13. motion preferences ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    transition-duration:.001ms !important;
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
  }
  .skip-link{transition:none}
}