/* =========================================================
   英亚平台CN官方站 · 共享样式 /assets/site.css
   隐喻：深夜机场电子指示牌 —— 冷底、细描边、精确坐标
   ========================================================= */

:root{
  --navy-950:#050C1C;
  --navy-900:#04091A;
  --navy-800:#081226;
  --navy-700:#10204A;
  --line:#1E3560;
  --line-soft:rgba(30,53,96,.62);
  --cyan:#2FE0F0;
  --cyan-soft:rgba(47,224,240,.14);
  --orange:#FF8A3D;
  --green:#6BF2A4;
  --amber:#FFC861;
  --paper:#F2EFE6;
  --paper-line:#D8D2C2;
  --ink:#0C1730;
  --ink-dim:#4C5566;
  --text:#E9EFFA;
  --text-dim:#93A6C4;
  --font-display:"PingFang SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:"PingFang SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono","SF Mono",Consolas,"Liberation Mono",monospace;
  --wrap:1280px;
  --rail:240px;
  --header-h:98px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 16px)}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg,video{display:block;max-width:100%}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}
::selection{background:var(--cyan);color:var(--navy-900)}

/* ---------- base typography ---------- */
body{
  background:var(--navy-800);
  color:var(--text);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.8;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  min-height:100vh;
}
h1,h2,h3,h4{font-weight:500;line-height:1.35;letter-spacing:-.01em}
p{text-wrap:pretty}

.mono{
  font-family:var(--font-mono);
  font-size:.82em;
  letter-spacing:.04em;
}
.text-dim{color:var(--text-dim)}
.display{
  font-family:var(--font-display);
  font-weight:300;
  font-stretch:75%;
  font-size:clamp(2.6rem,8vw,7rem);
  line-height:.95;
  letter-spacing:-.02em;
}
.eyebrow{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--cyan);
}
.lede{
  font-size:1.05rem;
  line-height:1.9;
  color:var(--text-dim);
  max-width:62ch;
}
.visually-hidden{
  position:absolute !important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- focus / motion ---------- */
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:2px}
.skip-link{
  position:absolute;left:16px;top:-64px;z-index:120;
  background:var(--cyan);color:var(--navy-900);
  padding:10px 18px;border-radius:2px;font-size:.85rem;
  transition:top .16s var(--ease);
}
.skip-link:focus{top:8px}

/* ---------- layout containers ---------- */
.wrap{
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding-inline:clamp(16px,3vw,40px);
}
.section{padding-block:clamp(36px,5.5vw,84px)}
.section--deep{background:var(--navy-700)}
.section--tight{padding-block:clamp(24px,3.4vw,48px)}
.stack{display:grid;gap:clamp(14px,1.6vw,22px)}
.layout{
  display:grid;
  grid-template-columns:var(--rail) minmax(0,1fr);
  gap:clamp(24px,3vw,56px);
  align-items:start;
}
.section-head{
  display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;
  gap:10px 20px;
  border-bottom:1px solid var(--line);
  padding-bottom:12px;margin-bottom:clamp(20px,3vw,36px);
}
.section-head__title{font-size:clamp(1.35rem,2.4vw,2rem);font-weight:500}
.section-head__note{font-family:var(--font-mono);font-size:.72rem;color:var(--text-dim);letter-spacing:.08em}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:var(--navy-800);
  border-bottom:1px solid var(--line);
}
.topbar{background:var(--navy-900);border-bottom:1px solid var(--line);transition:background .2s var(--ease)}
.navbar{position:relative}
.topbar__inner,.navbar__inner,.footer__inner{
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding-inline:clamp(16px,3vw,40px);
}
.topbar__inner{
  min-height:32px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  font-size:.75rem;letter-spacing:.06em;
}
.topbar__brand{color:var(--text-dim);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topbar__status{display:inline-flex;align-items:center;gap:8px;color:var(--text-dim);white-space:nowrap}
.topbar__ver{color:var(--text)}
.topbar__sep{color:var(--line)}
.topbar__flag{color:var(--green);letter-spacing:.08em}
.site-header[data-scrolled] .topbar{background:var(--navy-950)}
.site-header[data-scrolled]{box-shadow:0 10px 26px -22px rgba(0,0,0,.9)}

.navbar__inner{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  min-height:66px;
}
.brand{display:flex;align-items:center;gap:14px;min-width:0}
.brand__link{display:inline-flex;align-items:center;gap:10px;font-weight:500;font-size:1.02rem;letter-spacing:.02em}
.brand__mark{
  width:28px;height:28px;flex:none;
  display:grid;place-items:center;
  border:1px solid var(--cyan);border-radius:2px;
  color:var(--cyan);font-family:var(--font-mono);font-size:.78rem;
}
.brand__name{white-space:nowrap}
.brand__tags{display:flex;gap:6px}
.chip{
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;
  border:1px solid var(--line);color:var(--text-dim);
  padding:2px 8px;border-radius:999px;
}
.chip--on{color:var(--cyan);border-color:rgba(47,224,240,.5);background:var(--cyan-soft)}

.site-nav__list{display:flex;align-items:center;gap:clamp(10px,1.8vw,26px)}
.site-nav__link{
  position:relative;display:inline-block;padding:6px 2px;
  font-size:.9rem;letter-spacing:.04em;color:var(--text-dim);
  transition:color .12s var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left;
  transition:transform .2s var(--ease);
}
.site-nav__link:hover{color:var(--text)}
.site-nav__link[aria-current="page"]{color:var(--cyan)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}

.nav-toggle{display:none}
.nav-toggle__bars{
  width:16px;height:9px;flex:none;
  background-image:linear-gradient(var(--cyan),var(--cyan)),linear-gradient(var(--cyan),var(--cyan)),linear-gradient(var(--cyan),var(--cyan));
  background-size:100% 1.5px,100% 1.5px,100% 1.5px;
  background-position:0 0,0 50%,0 100%;
  background-repeat:no-repeat;
}
.nav-toggle__text{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.14em}

/* ---------- footer ---------- */
.site-footer{
  background:var(--navy-900);
  border-top:1px solid var(--line);
  margin-top:clamp(48px,7vw,96px);
}
.footer__inner{
  display:grid;
  grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr) minmax(0,1.15fr);
  gap:clamp(24px,4vw,64px);
  padding-block:clamp(32px,4.6vw,60px) clamp(28px,4vw,52px);
}
.footer__col{min-width:0}
.footer__brand{font-size:1.05rem;font-weight:500;letter-spacing:.02em;margin-bottom:10px}
.footer__line{font-size:.85rem;line-height:1.95;color:var(--text-dim)}
.footer__line .mono{color:var(--text)}
.footer__copy{
  margin-top:16px;font-family:var(--font-mono);
  font-size:.7rem;letter-spacing:.08em;color:var(--text-dim);
}
.footer__title{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.18em;
  color:var(--cyan);margin-bottom:14px;font-weight:400;
}
.footer__list{display:grid;gap:8px;font-size:.88rem;color:var(--text-dim)}
.footer__list a{transition:color .12s var(--ease)}
.footer__list a:hover{color:var(--cyan)}
.footer__list--legal{border-top:1px solid var(--line);margin-top:16px;padding-top:14px}
.footer__col--contact .footer__list{color:var(--text)}
.footer__col--contact .footer__list .mono{font-size:.86rem;word-break:break-all}
.footer__note{margin-top:14px;font-size:.78rem;line-height:1.85;color:var(--text-dim);max-width:34ch}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 18px;border:1px solid var(--line);border-radius:2px;
  font-size:.9rem;letter-spacing:.04em;color:var(--text);
  transition:border-color .12s var(--ease),color .12s var(--ease),background .12s var(--ease),transform .12s var(--ease);
}
.btn:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--primary{background:var(--orange);border-color:var(--orange);color:#200B01;font-weight:500}
.btn--primary:hover{background:#FF9E63;border-color:#FF9E63;color:#200B01}
.btn--ghost{border-color:rgba(47,224,240,.45);color:var(--cyan);background:rgba(47,224,240,.05)}
.btn--ghost:hover{background:var(--cyan-soft);border-color:var(--cyan)}
.btn--quiet{border-color:transparent;color:var(--cyan);padding-inline:4px}
.btn--quiet:hover{border-color:transparent;color:var(--cyan);text-decoration:underline;text-underline-offset:4px}

/* ---------- breadcrumb ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;
  color:var(--text-dim);
}
.breadcrumb a{transition:color .12s var(--ease)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb__sep{color:var(--line)}

/* ---------- status dots ---------- */
.dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--text-dim);flex:none}
.dot--live{background:var(--green);animation:dot-pulse 1.6s ease-in-out infinite}
.dot--warn{background:var(--amber)}
.dot--info{background:var(--cyan)}
@keyframes dot-pulse{
  0%,100%{box-shadow:0 0 0 0 rgba(107,242,164,.55)}
  50%{box-shadow:0 0 0 5px rgba(107,242,164,0)}
}

/* ---------- cards ---------- */
.card-grid{
  display:grid;gap:clamp(14px,1.6vw,22px);
  grid-template-columns:repeat(auto-fill,minmax(272px,1fr));
}
.card-grid--narrow{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}
.card{
  display:flex;flex-direction:column;gap:10px;
  background:var(--navy-700);
  border:1px solid var(--line);border-radius:3px;
  padding:clamp(16px,2vw,24px);
  transition:border-color .14s var(--ease),transform .14s var(--ease);
}
.card:hover{border-color:rgba(47,224,240,.5);transform:translateY(-2px)}
.card__index{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.12em;color:var(--text-dim)}
.card__title{font-size:1.05rem;font-weight:500;letter-spacing:.01em;color:var(--text)}
.card__body{font-size:.92rem;line-height:1.85;color:var(--text-dim)}
.card__foot{
  margin-top:auto;padding-top:12px;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  border-top:1px solid var(--line-soft);
  font-family:var(--font-mono);font-size:.72rem;color:var(--text-dim);letter-spacing:.06em;
}
.card--paper{background:var(--paper);border-color:var(--paper-line);color:var(--ink)}
.card--paper .card__title{color:var(--ink)}
.card--paper .card__body{color:var(--ink-dim)}
.card--paper .card__index{color:#7A8398}
.card--paper .card__foot{border-top-color:var(--paper-line);color:#7A8398}
.card--paper .btn--quiet{color:#B8541A}

/* ---------- rail / timeline / tags ---------- */
.rail{position:sticky;top:calc(var(--header-h) + 20px)}
.rail__title{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.16em;
  color:var(--cyan);margin-bottom:14px;
}
.rail-nav{display:grid;gap:2px;margin-top:22px}
.rail-link{
  display:flex;gap:10px;align-items:baseline;
  padding:8px 10px;font-size:.88rem;color:var(--text-dim);
  border-left:2px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.rail-link:hover{color:var(--text)}
.rail-link[aria-current="true"]{color:var(--cyan);border-left-color:var(--cyan);background:rgba(47,224,240,.06)}
.rail-link__idx{font-family:var(--font-mono);font-size:.68rem;color:var(--text-dim)}

.timeline{
  position:relative;display:grid;gap:18px;
  padding-left:18px;border-left:1px solid var(--line);
}
.timeline__item{position:relative}
.timeline__item::before{
  content:"";position:absolute;left:-24px;top:7px;
  width:7px;height:7px;border-radius:50%;
  background:var(--navy-700);border:1px solid var(--line);
  transition:background .2s var(--ease),box-shadow .2s var(--ease);
}
.timeline__item--on::before{background:var(--cyan);border-color:var(--cyan);box-shadow:0 0 0 3px rgba(47,224,240,.18)}
.timeline__ver{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.1em;color:var(--cyan)}
.timeline__text{font-size:.84rem;line-height:1.7;color:var(--text-dim);margin-top:2px}

.tagbar{display:flex;flex-wrap:wrap;gap:8px}
.tagbar__item{
  border:1px solid var(--line);border-radius:999px;
  padding:5px 12px;font-size:.78rem;color:var(--text-dim);
  transition:color .12s var(--ease),border-color .12s var(--ease),background .12s var(--ease);
}
.tagbar__item:hover{color:var(--text);border-color:var(--cyan)}
.tagbar__item[aria-pressed="true"]{
  color:var(--cyan);border-color:rgba(47,224,240,.55);background:var(--cyan-soft);
}

/* ---------- prose & callout ---------- */
.prose{display:grid;gap:1.2em;max-width:68ch;font-size:1.05rem;line-height:1.8}
.prose h2{font-size:clamp(1.25rem,2vw,1.6rem);margin-top:.6em}
.prose h3{font-size:1.1rem;margin-top:.4em}
.prose ul{list-style:disc;padding-left:1.3em;display:grid;gap:.4em}
.prose ol{list-style:decimal;padding-left:1.4em;display:grid;gap:.4em}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:4px}
.callout{
  border:1px solid var(--line);border-left:3px solid var(--orange);
  background:rgba(16,32,74,.72);
  padding:14px 18px;border-radius:2px;
  font-size:.92rem;line-height:1.85;color:var(--text-dim);
}
.callout--info{border-left-color:var(--cyan)}
.callout--good{border-left-color:var(--green)}

/* ---------- media (页面阶段放图) ---------- */
.media{
  position:relative;display:block;width:100%;overflow:hidden;
  background:var(--navy-700);
  border:1px solid var(--line);border-radius:3px;
}
.media__frame{position:relative;width:100%;padding-top:56.25%}
.media__frame > img,
.media__frame > svg,
.media__frame > picture{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.media--4x3 .media__frame{padding-top:75%}
.media--1x1 .media__frame{padding-top:100%}
.media--21x9 .media__frame{padding-top:42.86%}
.media__grid{
  position:absolute;inset:0;pointer-events:none;opacity:.32;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),
                   linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:32px 32px;
}
.media__cap{
  display:block;padding:8px 2px 0;
  font-family:var(--font-mono);font-size:.72rem;color:var(--text-dim);letter-spacing:.06em;
}

/* ---------- copyfield ---------- */
.copyfield{
  display:flex;align-items:center;gap:12px;
  border:1px dashed var(--line);border-radius:2px;
  background:rgba(5,12,28,.6);
  padding:10px 12px;
}
.copyfield__value{
  font-family:var(--font-mono);font-size:.82rem;color:var(--text);
  overflow-x:auto;white-space:nowrap;flex:1;min-width:0;
}
.copyfield__btn{
  flex:none;border:1px solid var(--line);border-radius:2px;
  padding:6px 12px;font-size:.76rem;color:var(--cyan);letter-spacing:.06em;
  transition:border-color .12s var(--ease),background .12s var(--ease);
}
.copyfield__btn:hover{border-color:var(--cyan);background:var(--cyan-soft)}

/* ---------- injected: progress / toast / back-to-top ---------- */
.scroll-progress{
  position:fixed;top:0;left:0;height:2px;width:0;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  z-index:95;pointer-events:none;
}
.toast{
  position:fixed;left:50%;bottom:32px;z-index:96;
  transform:translate(-50%,12px);
  background:var(--navy-900);border:1px solid var(--cyan);color:var(--cyan);
  padding:9px 18px;border-radius:2px;
  font-family:var(--font-mono);font-size:.76rem;letter-spacing:.06em;
  opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s;
}
.toast[data-show]{opacity:1;visibility:visible;transform:translate(-50%,0)}
.to-top{
  position:fixed;right:clamp(16px,3vw,32px);bottom:clamp(16px,3vw,32px);z-index:94;
  width:44px;height:44px;display:grid;place-items:center;
  background:var(--navy-950);border:1px solid var(--line);border-radius:2px;
  color:var(--cyan);font-size:1rem;line-height:1;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s,border-color .12s var(--ease);
}
.to-top[data-show]{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--cyan)}

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

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .site-nav__list{gap:12px}
  .site-nav__link{font-size:.85rem}
}
@media (max-width:980px){
  .layout{grid-template-columns:1fr;gap:24px}
  .rail{position:static;border-top:1px solid var(--line);padding-top:18px}
  .rail-nav{
    display:flex;gap:6px;overflow-x:auto;margin-top:12px;
    padding-bottom:4px;scrollbar-width:thin;
  }
  .rail-link{
    border-left:0;border-bottom:2px solid transparent;
    white-space:nowrap;padding:6px 10px;
  }
  .rail-link[aria-current="true"]{border-left-color:transparent;border-bottom-color:var(--cyan)}
  .timeline{
    grid-auto-flow:column;grid-auto-columns:minmax(150px,1fr);
    overflow-x:auto;padding-left:0;border-left:0;
    border-top:1px solid var(--line);padding-top:14px;
  }
  .timeline__item::before{display:none}
}
@media (max-width:900px){
  :root{--header-h:98px}
  .nav-toggle{
    display:inline-flex;align-items:center;gap:8px;
    border:1px solid var(--line);border-radius:2px;
    padding:8px 12px;color:var(--text);
    transition:border-color .12s var(--ease),color .12s var(--ease);
  }
  .nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
  .nav-toggle[aria-expanded="true"]{border-color:var(--cyan);color:var(--cyan)}
  .site-nav{
    display:none;
    position:absolute;left:0;right:0;top:100%;
    background:var(--navy-950);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line);
    box-shadow:0 24px 40px -30px rgba(0,0,0,.95);
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
  }
  .site-nav[data-open]{display:block}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;padding:6px 0 12px}
  .site-nav__link{
    display:block;padding:14px clamp(16px,3vw,40px);
    font-size:.98rem;border-bottom:1px solid var(--line-soft);color:var(--text);
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{
    color:var(--cyan);
    border-left:3px solid var(--cyan);
    padding-left:calc(clamp(16px,3vw,40px) - 3px);
    background:rgba(47,224,240,.06);
  }
  .site-nav li:last-child .site-nav__link{border-bottom:0}
}
@media (max-width:860px){
  .footer__inner{grid-template-columns:1fr 1fr}
  .footer__col--contact{grid-column:1 / -1}
  .footer__col--contact .footer__note{max-width:56ch}
}
@media (max-width:640px){
  body{font-size:16px}
  .topbar__sep,.topbar__status .mono:not(.topbar__ver){display:none}
  .topbar__status{gap:6px}
  .brand__tags{display:none}
  .brand__name{font-size:.95rem}
  .navbar__inner{min-height:58px}
  .footer__inner{grid-template-columns:1fr;gap:28px}
  .card-grid{grid-template-columns:1fr}
  .copyfield{flex-wrap:wrap}
}

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