/* ============================================================
   金牛国际中文站 · 共享样式 /assets/site.css
   鎏金夜色 + 精密网格 + 数据叙事
   ============================================================ */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;background:#0B0E14;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0}
ul,ol{list-style:none;margin:0;padding:0}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}

/* ---------- 2. 设计令牌 ---------- */
:root{
  --ink-900:#0B0E14;
  --ink-800:#141924;
  --ink-700:#1E2533;
  --copper:#8C2F1E;
  --gold:#C9A227;
  --gold-bright:#F2D06B;
  --jade:#2FBFA0;
  --paper:#E9E4DA;
  --mist:#9AA3B2;
  --stone:#6E7686;

  --line:rgba(110,118,134,.38);
  --line-soft:rgba(110,118,134,.18);
  --grid-line:rgba(110,118,134,.07);

  --rail-w:220px;
  --status-h:32px;
  --mobile-bar-h:56px;
  --wrap:1180px;

  --font-display:"Source Han Serif SC","Noto Serif SC","Songti SC","SimSun",Georgia,serif;
  --font-body:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;

  --dur:.12s;
}

/* ---------- 3. 基底与中文排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:clamp(.95rem,1.02vw,1.05rem);
  line-height:1.8;
  color:var(--paper);
  background-color:var(--ink-900);
  background-image:
    linear-gradient(var(--grid-line) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);
  background-size:56px 56px;
  min-height:100vh;
  padding-top:var(--status-h);
}
html.nav-open{overflow:hidden}

h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;line-height:1.16;letter-spacing:-.005em;color:var(--paper)}
h1{font-size:clamp(2.2rem,5vw,3.6rem)}
h2{font-size:clamp(1.6rem,3vw,2.4rem)}
h3{font-size:clamp(1.2rem,1.9vw,1.5rem)}
h4{font-family:var(--font-body);font-weight:700;font-size:clamp(1.02rem,1.4vw,1.15rem)}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}

.mono,.data-figure,.rail__num,.status-bar__version,.footer__icp,
.footer__updated,.footer__copy,.copy-btn,.media-caption{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.04em;
}
time{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:1.2em;letter-spacing:.06em}

:focus-visible{outline:2px solid var(--jade);outline-offset:2px}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.rule{height:1px;background:var(--line);border:0;margin:clamp(1.5rem,4vw,2.5rem) 0}

.skip-link{
  position:fixed;top:calc(var(--status-h) + 6px);left:8px;z-index:130;
  transform:translateY(-200%);
  background:var(--gold-bright);color:var(--ink-900);
  padding:.5rem .9rem;font-size:.85rem;letter-spacing:.06em;
  transition:transform var(--dur) ease;
}
.skip-link:focus{transform:none}

/* ---------- 4. 顶部状态条 ---------- */
.site-header{position:relative;z-index:60}
.status-bar{
  position:fixed;top:0;left:0;right:0;height:var(--status-h);z-index:80;
  background:linear-gradient(90deg,#0B0E14 0%,#141924 55%,#0B0E14 100%);
  border-bottom:1px solid var(--line);
}
.status-bar__inner{
  height:100%;max-width:1760px;margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:0 clamp(.7rem,2vw,1.25rem);
}
.status-bar__section{
  display:flex;align-items:center;gap:.55rem;margin:0;
  font-size:.72rem;letter-spacing:.2em;color:var(--paper);white-space:nowrap;overflow:hidden;
}
.status-bar__dot{flex:none;width:6px;height:6px;background:var(--jade);box-shadow:0 0 8px rgba(47,191,160,.9)}
.status-bar__meta{display:flex;align-items:center;gap:.6rem}
.status-bar__version{font-size:.68rem;color:var(--mist);letter-spacing:.08em}
.status-bar__sep{width:1px;height:12px;background:var(--line)}
.lang-toggle{display:inline-flex;border:1px solid var(--line)}
.lang-toggle__btn{
  padding:.1rem .45rem;font-size:.68rem;letter-spacing:.12em;color:var(--mist);
  transition:color var(--dur) ease,background-color var(--dur) ease;
}
.lang-toggle__btn:hover{color:var(--paper)}
.lang-toggle__btn.is-active{background:var(--gold);color:var(--ink-900)}
[data-lang="hant"] .lang-toggle__btn.is-active{background:var(--gold-bright)}

/* ---------- 5. 移动端顶栏与抽屉按钮 ---------- */
.mobile-bar{
  position:fixed;top:var(--status-h);left:0;right:0;height:var(--mobile-bar-h);z-index:70;
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:0 clamp(.7rem,3vw,1.25rem);
  background:rgba(20,25,36,.96);
  border-bottom:1px solid var(--line);
}
.mobile-bar__brand{font-family:var(--font-display);font-weight:900;font-size:1.05rem;letter-spacing:.1em;color:var(--paper)}
.mobile-bar__brand em,.rail__brand-name em,.footer__wordmark em{font-style:normal;color:var(--gold)}
.nav-toggle{
  display:inline-flex;align-items:center;gap:.55rem;height:36px;padding:0 .6rem;
  border:1px solid var(--line);color:var(--mist);
  font-size:.72rem;letter-spacing:.16em;
  transition:border-color var(--dur) ease,color var(--dur) ease;
}
.nav-toggle:hover{border-color:var(--jade);color:var(--paper)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle__bar{height:1px;width:100%;background:currentColor;transition:transform var(--dur) ease,opacity var(--dur) ease}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(5px) 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(-5px) rotate(-45deg)}

/* ---------- 6. 侧边轨道导航（移动端 = 全屏抽屉） ---------- */
.rail{
  --rail-progress:0;
  position:fixed;z-index:60;
  top:calc(var(--status-h) + var(--mobile-bar-h));left:0;right:0;bottom:0;
  display:flex;flex-direction:column;
  padding:1.25rem clamp(1rem,5vw,2rem) 2rem;
  background:rgba(11,14,20,.98);
  border-right:1px solid var(--line);
  overflow-y:auto;
  opacity:0;visibility:hidden;transform:translateY(-6px);
  transition:opacity .16s ease,transform .16s ease,visibility .16s ease;
}
.rail[data-open]{opacity:1;visibility:visible;transform:none}

.rail__brand{padding-bottom:1rem;border-bottom:1px solid var(--line)}
.rail__brand-name{display:block;font-family:var(--font-display);font-weight:900;font-size:1.35rem;letter-spacing:.08em;color:var(--paper)}
.rail__brand-sub{margin:.4rem 0 0;font-size:.68rem;letter-spacing:.16em;color:var(--mist)}

.rail__body{flex:1 1 auto;padding-top:1.25rem}
.rail__label{margin:0 0 .7rem;font-size:.68rem;letter-spacing:.22em;color:var(--mist)}
.rail__list{display:flex;flex-direction:column}
.rail__item{border-bottom:1px solid var(--line-soft)}
.rail__item:last-child{border-bottom:0}
.rail__link{
  position:relative;display:flex;align-items:baseline;gap:.7rem;
  padding:.62rem .3rem;color:var(--mist);font-size:1rem;letter-spacing:.03em;
  transition:color var(--dur) ease,background-color var(--dur) ease;
}
.rail__link:hover{color:var(--paper)}
.rail__num{font-size:.7rem;color:var(--stone);letter-spacing:.1em}
.rail__link[aria-current="page"]{color:var(--gold-bright)}
.rail__link[aria-current="page"] .rail__num{color:var(--gold)}
.rail__link[aria-current="page"]::after{
  content:"";position:absolute;right:0;top:50%;width:16px;height:1px;
  background:var(--gold-bright);transform:translateY(-50%);
}
.rail__scale{display:none}

.rail__quick{margin-top:1.25rem;padding-top:1rem;border-top:1px solid var(--line)}
.rail__quick-list{display:flex;flex-direction:column;gap:.35rem}
.quick-link{
  display:flex;align-items:center;justify-content:space-between;gap:.6rem;
  padding:.5rem .55rem;border:1px solid transparent;color:var(--mist);font-size:.88rem;
  transition:border-color var(--dur) ease,color var(--dur) ease,background-color var(--dur) ease;
}
.quick-link:hover,.quick-link:focus-visible{border-color:var(--jade);color:var(--paper)}
.quick-link__tag{
  flex:none;font-family:var(--font-mono);font-size:.62rem;letter-spacing:.1em;
  color:var(--jade);border:1px solid rgba(47,191,160,.5);padding:.05rem .3rem;
}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  position:relative;
  background:linear-gradient(180deg,var(--ink-800) 0%,#0B0E14 78%);
  border-top:2px solid var(--copper);
  margin-top:clamp(3rem,7vw,6rem);
}
.footer__inner{
  max-width:var(--wrap);margin:0 auto;
  padding:clamp(2.25rem,5vw,3.5rem) clamp(1rem,3vw,2.5rem) clamp(1.25rem,3vw,2rem);
  display:grid;gap:clamp(1.6rem,3vw,2.5rem);
  grid-template-columns:1fr;
}
.footer__brand{display:flex;flex-direction:column;align-items:flex-start;gap:.5rem}
.footer__wordmark{font-family:var(--font-display);font-weight:900;font-size:1.5rem;letter-spacing:.08em;color:var(--paper)}
.footer__sub{margin:0;font-size:.74rem;letter-spacing:.16em;color:var(--mist)}
.footer__status{
  display:flex;align-items:center;gap:.45rem;margin:.4rem 0 0;
  font-size:.72rem;letter-spacing:.08em;color:var(--mist);
  border:1px solid var(--line);padding:.25rem .55rem;
}
.footer__status-dot{width:5px;height:5px;background:var(--jade);box-shadow:0 0 6px rgba(47,191,160,.9)}
.footer__col-title{
  margin:0 0 1rem;font-family:var(--font-body);font-weight:700;
  font-size:.72rem;letter-spacing:.2em;color:var(--mist);
}
.footer__col-title::after{content:"";display:block;width:18px;height:1px;background:var(--copper);margin-top:.55rem}
.footer__list li+li{margin-top:.1rem}
.footer__link{
  display:inline-block;padding:.2rem 0;font-size:.9rem;color:var(--mist);
  border-bottom:1px solid transparent;
  transition:color var(--dur) ease,border-color var(--dur) ease;
}
.footer__link:hover,.footer__link:focus-visible{color:var(--paper);border-bottom-color:var(--jade)}

.support-item{margin-bottom:.9rem}
.support-item:last-child{margin-bottom:0}
.support-item__label{display:block;font-size:.66rem;letter-spacing:.2em;color:var(--mist);opacity:.82}
.support-item__value{margin:.2rem 0 0;font-size:.86rem;line-height:1.7;color:var(--mist)}
.copy-btn{
  display:inline-flex;align-items:center;gap:.4rem;margin-top:.2rem;
  font-size:.88rem;color:var(--gold-bright);
  border-bottom:1px dashed rgba(242,208,107,.45);padding:.05rem 0;
  transition:color var(--dur) ease,border-color var(--dur) ease;
}
.copy-btn:hover,.copy-btn:focus-visible{color:var(--jade);border-bottom-color:var(--jade)}
.copy-btn::after{
  content:"复制";font-family:var(--font-body);font-size:.62rem;letter-spacing:.12em;
  color:var(--mist);border:1px solid var(--line);padding:0 .28rem;
}
.copy-btn.is-copied::after{content:"已复制";color:var(--jade);border-color:rgba(47,191,160,.5)}
.footer__icp{
  margin:1rem 0 0;padding-top:.65rem;border-top:1px solid var(--line);
  font-size:.76rem;color:var(--mist);
}
.footer__bottom{
  max-width:var(--wrap);margin:0 auto;
  padding:1rem clamp(1rem,3vw,2.5rem) 1.6rem;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;gap:.5rem 1.5rem;justify-content:space-between;
  font-size:.74rem;color:var(--mist);
}
.footer__bottom p{margin:0}
.footer__updated{font-size:.74rem}
.footer__copy{font-size:.74rem}

/* ---------- 8. 页面骨架与通用模块 ---------- */
.content-wrap{
  width:100%;max-width:var(--wrap);margin:0 auto;
  padding:clamp(1.75rem,4vw,3.25rem) clamp(1rem,3vw,2.5rem) clamp(3rem,6vw,5rem);
}
.content-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:clamp(1.5rem,4vw,3rem)}
.content-main{min-width:0}
.annotation-rail{
  display:flex;flex-wrap:wrap;gap:1rem 2rem;
  border-top:1px solid var(--line);padding-top:1rem;
}
.vert-note{
  writing-mode:vertical-rl;font-size:13px;letter-spacing:.28em;color:var(--mist);
  font-family:var(--font-body);
}
.vert-note--gold{color:var(--gold)}

.eyebrow{
  display:inline-flex;align-items:center;gap:.5rem;margin:0 0 .9rem;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.22em;color:var(--gold);
}
.lede{font-size:clamp(1.05rem,1.6vw,1.25rem);line-height:1.75;color:var(--paper);max-width:34em}
.prose{max-width:42em}
.prose p{margin:0 0 1.15em}
.prose h2{margin:2.2em 0 .7em;font-size:clamp(1.4rem,2.4vw,1.9rem)}
.prose h3{margin:1.8em 0 .6em;font-size:clamp(1.15rem,1.8vw,1.4rem)}
.prose ul{list-style:none;margin:0 0 1.15em}
.prose li{position:relative;padding-left:1.2rem;margin-bottom:.5em}
.prose li::before{content:"";position:absolute;left:0;top:.78em;width:8px;height:1px;background:var(--jade)}

.section-head{
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:.3rem 1rem;align-items:baseline;
  margin:0 0 clamp(1.25rem,3vw,2rem);
  padding-bottom:.85rem;border-bottom:1px solid var(--line);
}
.section-head__num{font-family:var(--font-mono);font-size:1rem;letter-spacing:.1em;color:var(--gold)}
.section-head__title{margin:0}
.section-head__note{grid-column:2;margin:.45rem 0 0;font-size:.85rem;color:var(--mist)}
[data-section].is-current .section-head__num{color:var(--gold-bright)}

.panel{background:var(--ink-700);border:1px solid var(--line);padding:clamp(1rem,2.5vw,1.75rem)}
.panel--copper{border-top:2px solid var(--copper)}
.panel--jade{border-left:2px solid var(--jade)}
.data-figure{
  display:block;font-size:clamp(1.6rem,4vw,2.6rem);line-height:1.1;
  color:var(--gold-bright);letter-spacing:.02em;
}
.tag{
  display:inline-flex;align-items:center;font-size:.68rem;letter-spacing:.12em;
  padding:.15rem .45rem;border:1px solid var(--line);color:var(--mist);
}
.tag--jade{color:var(--jade);border-color:rgba(47,191,160,.45)}
.tag--gold{color:var(--gold-bright);border-color:rgba(242,208,107,.45)}

.grid{display:grid;gap:clamp(1rem,2.2vw,1.5rem)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}

.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.65rem 1.1rem;border:1px solid var(--line);color:var(--paper);
  font-size:.9rem;letter-spacing:.06em;
  transition:border-color var(--dur) ease,color var(--dur) ease,background-color var(--dur) ease;
}
.btn:hover,.btn:focus-visible{border-color:var(--jade);color:var(--jade)}
.btn--gold{
  background:linear-gradient(100deg,var(--copper) 0%,var(--gold) 100%);
  border-color:transparent;color:var(--ink-900);font-weight:600;
}
.btn--gold:hover,.btn--gold:focus-visible{color:var(--ink-900);filter:brightness(1.08)}

.breadcrumbs{margin:0 0 1.25rem;font-size:.78rem;color:var(--mist)}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem}
.breadcrumbs li+li::before{content:"/";color:var(--stone);margin-right:.4rem}
.breadcrumbs a:hover,.breadcrumbs a:focus-visible{color:var(--jade)}
.breadcrumbs [aria-current="page"]{color:var(--paper)}

.media-frame{
  position:relative;overflow:hidden;aspect-ratio:16/10;
  border:1px solid var(--line);
  background:linear-gradient(150deg,var(--copper) 0%,var(--ink-800) 55%,var(--ink-900) 100%);
}
.media-frame>img{width:100%;height:100%;object-fit:cover;filter:saturate(.82) contrast(1.06) brightness(.86)}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(160deg,rgba(140,47,30,.42),rgba(11,14,20,.78));
  mix-blend-mode:multiply;
}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-caption{margin-top:.6rem;font-size:.74rem;color:var(--mist);letter-spacing:.06em}

/* ---------- 9. 返回顶部 ---------- */
.to-top{
  position:fixed;z-index:50;
  right:clamp(.75rem,2vw,1.5rem);bottom:clamp(.75rem,2vw,1.5rem);
  width:44px;height:44px;display:grid;place-items:center;
  border:1px solid var(--line);background:rgba(20,25,36,.92);
  color:var(--mist);font-family:var(--font-mono);font-size:.8rem;
  opacity:0;visibility:hidden;
  transition:opacity .16s ease,visibility .16s ease,color var(--dur) ease,border-color var(--dur) ease;
}
.to-top.is-visible{opacity:1;visibility:visible}
.to-top:hover,.to-top:focus-visible{color:var(--jade);border-color:var(--jade)}

/* ---------- 10. 显现动效 ---------- */
.js-enabled [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .3s ease,transform .3s ease;
}
.js-enabled [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 11. 响应式 ---------- */
@media (min-width:640px){
  .footer__inner{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__brand{grid-column:1 / -1}
}
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .mobile-bar{display:none}
  .rail{
    top:var(--status-h);right:auto;bottom:0;width:var(--rail-w);
    padding:1.5rem 1.1rem 1.1rem;
    background:var(--ink-800);
    opacity:1;visibility:visible;transform:none;
    transition:none;
    overflow:visible;
  }
  .rail__brand::before{
    content:"";display:block;width:30px;height:2px;margin-bottom:.9rem;
    background:linear-gradient(90deg,var(--copper),var(--gold));
  }
  .rail__body{position:relative;padding-right:16px}
  .rail__list{margin-top:.2rem}
  .rail__item{border-bottom:0}
  .rail__link{padding:.42rem 0;font-size:.94rem}
  .rail__link[aria-current="page"]::after{right:auto;left:-1.1rem;width:14px}
  .rail__scale{
    display:block;position:absolute;top:.4rem;bottom:.4rem;right:0;width:2px;
    background:rgba(110,118,134,.22);
  }
  .rail__scale-bar{
    position:absolute;left:0;top:0;width:100%;height:100%;
    background:linear-gradient(180deg,var(--gold),var(--jade));
    transform:scaleY(var(--rail-progress));transform-origin:top center;
  }
  .rail__quick{margin-top:auto}
}
@media (min-width:1200px){
  .content-grid{grid-template-columns:minmax(0,1fr) 160px}
  .annotation-rail{
    flex-direction:column;flex-wrap:nowrap;
    border-top:0;border-left:1px solid var(--line);padding-top:0;padding-left:1rem;
  }
}
@media (min-width:1080px){
  .footer__inner{grid-template-columns:1.5fr repeat(4,minmax(0,1fr))}
  .footer__brand{grid-column:auto}
}

/* ---------- 12. 无障碍与减弱动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js-enabled [data-reveal]{opacity:1;transform:none}
  .rail{transition:none}
}