/* ============================================================
   澳门新京葡站 /assets/site.css —— 共享外壳与基础组件
   深蓝网格 · 鎏金描线 · 等宽索引 · 直角无圆角
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --c-deep:#071A33;
  --c-midnight:#0E2A4D;
  --c-black:#03070F;
  --c-gold:#D4AF37;
  --c-gold-hi:#F2D57E;
  --c-purple:#7A4DFF;
  --c-jade:#1FBF8F;
  --c-ivory:#F5F1E6;
  --c-slate:#8FA3B8;
  --c-amber:#E2703A;

  --line:rgba(212,175,55,.30);
  --line-soft:rgba(143,163,184,.22);
  --grid-line:rgba(143,163,184,.09);

  --font-serif:"Source Han Serif SC","Noto Serif SC","Songti SC","SimSun",Georgia,"Times New Roman",serif;
  --font-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","SFMono-Regular",Menlo,Consolas,"Courier New",monospace;

  --wrap:1280px;
  --gut:clamp(18px,4vw,52px);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. Reset 与基础排版 ---------- */
*,*::before,*::after{box-sizing:border-box;}

html{
  background:var(--c-deep);
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}
html[data-nav-locked]{overflow:hidden;}

body{
  margin:0;
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.85;
  letter-spacing:.015em;
  color:var(--c-ivory);
  background:transparent;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{
  margin:0;
  font-family:var(--font-serif);
  font-weight:700;
  line-height:1.25;
  letter-spacing:.01em;
}
p{margin:0 0 1.1em;}
img,svg,video{max-width:100%;display:block;}
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;}
figure{margin:0;}

:focus-visible{outline:2px solid var(--c-gold-hi);outline-offset:3px;}
::selection{background:rgba(122,77,255,.45);color:#FFFFFF;}

/* ---------- 3. 背景图层：蓝图网格 + 对角光带 ---------- */
body::before{
  content:"";
  position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);
  background-size:calc(100% / 12) 100%;
  -webkit-mask-image:linear-gradient(180deg,transparent 0,#000 8%,#000 92%,transparent 100%);
  mask-image:linear-gradient(180deg,transparent 0,#000 8%,#000 92%,transparent 100%);
}
body::after{
  content:"";
  position:fixed;top:-30vh;left:-30vw;width:70vw;height:170vh;
  z-index:0;pointer-events:none;
  background:linear-gradient(115deg,
    transparent 0%,
    rgba(212,175,55,.10) 38%,
    rgba(122,77,255,.09) 55%,
    rgba(31,191,143,.05) 68%,
    transparent 84%);
  animation:xz-band 20s linear infinite;
  will-change:transform;
}
@keyframes xz-band{
  0%{transform:translate3d(-10%,0,0) rotate(16deg);}
  50%{transform:translate3d(50%,0,0) rotate(16deg);}
  100%{transform:translate3d(-10%,0,0) rotate(16deg);}
}
#main-content,.site-footer{position:relative;z-index:1;}

/* ---------- 4. 跳转链接 ---------- */
.skip-link{
  position:absolute;left:50%;top:-120px;transform:translateX(-50%);
  z-index:120;
  padding:10px 20px;
  background:var(--c-gold);color:#03101F;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;
  transition:top .22s var(--ease);
}
.skip-link:focus{top:10px;}

/* ---------- 5. 页头：居中刊头 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:linear-gradient(180deg,#03070F 0%,#061529 62%,#071A33 100%);
  border-bottom:1px solid var(--line);
  color:var(--c-ivory);
}
.site-header__inner{
  max-width:var(--wrap);
  margin:0 auto;
  padding:18px var(--gut) 10px;
  transition:padding .35s var(--ease);
}
.masthead{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:18px;
}
.masthead__coord{
  margin:0;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--c-slate);
  white-space:nowrap;
}
.masthead__brand{
  justify-self:center;
  display:flex;flex-direction:column;align-items:center;gap:3px;
  text-align:center;
}
.masthead__brand-cn{
  font-family:var(--font-serif);font-weight:700;
  font-size:clamp(1.5rem,3.2vw,2.35rem);
  line-height:1.1;
  letter-spacing:.16em;text-indent:.16em;
  background:linear-gradient(100deg,#F2D57E 0%,#D4AF37 34%,#FBF3D2 52%,#B8912A 76%,#F2D57E 100%);
  -webkit-background-clip:text;background-clip:text;
  color:var(--c-gold-hi);
  -webkit-text-fill-color:transparent;
  transition:font-size .35s var(--ease);
}
.masthead__brand-en{
  font-family:var(--font-mono);
  font-size:9.5px;letter-spacing:.42em;text-indent:.42em;
  color:var(--c-slate);
}
.header-actions{
  justify-self:end;
  display:flex;align-items:center;gap:10px;
}

.masthead__meta{
  margin:9px 0 0;
  max-height:40px;overflow:hidden;
  display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  color:var(--c-slate);
  transition:max-height .35s var(--ease),opacity .3s var(--ease),margin .35s var(--ease);
}
.masthead__tagline{color:rgba(245,241,230,.82);letter-spacing:.16em;}
.masthead__dot{color:var(--c-gold);}
.masthead__mono{color:var(--c-gold);}

/* 滚动收缩态 */
.site-header[data-scrolled="true"] .site-header__inner{padding-top:10px;padding-bottom:6px;}
.site-header[data-scrolled="true"] .masthead__meta{max-height:0;margin-top:0;opacity:0;}
.site-header[data-scrolled="true"] .masthead__brand-cn{font-size:clamp(1.2rem,2.4vw,1.7rem);}
.site-header[data-scrolled="true"] .site-nav__link{padding-top:10px;padding-bottom:10px;}

/* ---------- 6. 主导航（细线分隔带） ---------- */
.site-nav{
  border-top:1px solid var(--line-soft);
  background:rgba(3,7,15,.35);
}
.site-nav__list{
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gut);
  display:flex;justify-content:center;align-items:stretch;
}
.site-nav__item{
  position:relative;
  display:flex;flex-direction:column;
  border-right:1px solid var(--line-soft);
}
.site-nav__item:first-child{border-left:1px solid var(--line-soft);}
.site-nav__link{
  position:relative;
  display:flex;align-items:baseline;gap:8px;
  padding:14px 22px;
  font-size:15px;letter-spacing:.06em;
  color:var(--c-slate);
  transition:color .25s var(--ease),background .25s var(--ease),padding .35s var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,var(--c-gold),var(--c-gold-hi));
  transform:scaleX(0);transform-origin:left;
  transition:transform .35s var(--ease);
}
.site-nav__link:hover{color:var(--c-ivory);background:rgba(212,175,55,.06);}
.site-nav__link:hover::after{transform:scaleX(1);}
.site-nav__link:focus-visible::after{transform:scaleX(1);}
.site-nav__link[aria-current="page"]{color:var(--c-gold-hi);background:rgba(122,77,255,.10);}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);}
.site-nav__num{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;
  color:var(--c-gold);opacity:.72;
}
.site-nav__link[aria-current="page"] .site-nav__num{opacity:1;color:var(--c-gold-hi);}
.site-nav__desc{display:none;}
.site-nav__foot{display:none;}

/* 滚动进度 */
.site-header__progress{
  position:absolute;left:0;bottom:-1px;
  width:0;height:1px;
  background:linear-gradient(90deg,var(--c-jade),var(--c-gold-hi),var(--c-purple));
  transition:width .12s linear;
}

/* ---------- 7. 按钮 ---------- */
.btn{
  position:relative;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;
  border:1px solid var(--line);
  font-family:var(--font-sans);
  font-size:14px;letter-spacing:.09em;
  color:var(--c-ivory);
  background:transparent;
  transition:border-color .25s var(--ease),color .25s var(--ease),background .25s var(--ease),box-shadow .25s var(--ease);
}
.btn--sm{padding:8px 14px;font-size:13px;}
.btn--gold{
  border-color:rgba(212,175,55,.85);
  color:#04101F;
  background:linear-gradient(100deg,#D4AF37 0%,#F2D57E 100%);
  font-weight:600;
}
.btn--gold:hover,.btn--gold:focus-visible{
  background:linear-gradient(100deg,#F2D57E 0%,#FBF3D2 100%);
  box-shadow:0 0 0 1px rgba(242,213,126,.55);
}
.btn--ghost{
  border-color:rgba(212,175,55,.45);
  color:var(--c-gold-hi);
}
.btn--ghost:hover,.btn--ghost:focus-visible{
  border-color:var(--c-gold-hi);
  background:rgba(212,175,55,.10);
  color:#FBF3D2;
}

/* ---------- 8. 移动导航按钮 ---------- */
.nav-toggle{
  display:none;
  align-items:center;gap:9px;
  padding:8px 12px;
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.2em;
  color:var(--c-gold-hi);
}
.nav-toggle__bars{
  position:relative;
  display:inline-block;width:18px;height:10px;
}
.nav-toggle__bar{
  position:absolute;left:0;right:0;height:1px;
  background:currentColor;
  transition:transform .3s var(--ease),top .3s var(--ease);
}
.nav-toggle__bar--top{top:0;}
.nav-toggle__bar--bottom{top:9px;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar--top{top:4.5px;transform:rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar--bottom{top:4.5px;transform:rotate(-45deg);}

/* ---------- 9. 页脚 ---------- */
.site-footer{
  background:var(--c-black);
  border-top:1px solid var(--line);
  color:var(--c-slate);
  padding:clamp(40px,6vw,68px) 0 0;
}
.site-footer__inner{
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gut) clamp(28px,4vw,46px);
  display:grid;
  grid-template-columns:minmax(220px,1fr) 2.2fr;
  gap:clamp(24px,5vw,64px);
}
.site-footer__brand-link{
  display:inline-flex;flex-direction:column;gap:5px;
}
.site-footer__brand-cn{
  font-family:var(--font-serif);font-weight:700;
  font-size:clamp(1.4rem,2.4vw,1.85rem);
  letter-spacing:.16em;
  color:var(--c-ivory);
}
.site-footer__brand-en{
  font-family:var(--font-mono);
  font-size:10px;letter-spacing:.4em;
  color:var(--c-gold);
}
.site-footer__brand-link:hover .site-footer__brand-cn{color:var(--c-gold-hi);}
.site-footer__words{
  margin:16px 0 0;
  max-width:32em;
  font-size:14px;line-height:1.9;
  color:var(--c-slate);
}
.site-footer__words--mono{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:10.5px;letter-spacing:.2em;
  color:rgba(143,163,184,.65);
}
.site-footer__cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,42px);
}
.footer-col__title{
  position:relative;
  margin:0 0 16px;
  padding-bottom:10px;
  font-family:var(--font-mono);font-size:11px;font-weight:400;
  letter-spacing:.26em;
  color:var(--c-gold);
}
.footer-col__title::after{
  content:"";position:absolute;left:0;bottom:0;width:34px;height:1px;
  background:var(--c-gold);
}
.footer-col__list li{margin-bottom:10px;}
.footer-col__link{
  display:inline-flex;align-items:baseline;gap:9px;
  font-size:13.5px;letter-spacing:.08em;
  color:var(--c-slate);
  border-bottom:1px solid transparent;
  transition:color .22s var(--ease),border-color .22s var(--ease);
}
.footer-col__link:hover,.footer-col__link:focus-visible{
  color:var(--c-gold-hi);
  border-bottom-color:rgba(212,175,55,.5);
}
.footer-col__num{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;
  color:rgba(212,175,55,.7);
}
.footer-col__text{
  display:flex;align-items:baseline;gap:9px;
  font-size:13.5px;line-height:1.8;
  color:var(--c-slate);
  word-break:break-word;
}
.site-footer__legal{
  border-top:1px solid var(--line);
  background:rgba(212,175,55,.03);
}
.site-footer__legal-inner{
  max-width:var(--wrap);
  margin:0 auto;
  padding:16px var(--gut);
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 26px;
}
.site-footer__legal-inner p{margin:0;}
.site-footer__icp,
.site-footer__copy,
.site-footer__sig{
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.16em;
  color:var(--c-slate);
}
.site-footer__sig{
  margin-left:auto;
  color:rgba(212,175,55,.55);
}

/* ---------- 10. 布局容器与网格 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gut);
}
.section{
  position:relative;
  padding:clamp(56px,9vw,120px) 0;
}
.section--tight{padding:clamp(36px,5vw,72px) 0;}
.section--mid{background:linear-gradient(180deg,transparent,rgba(14,42,77,.72),transparent);}
.section--alt{background:var(--c-black);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft);}

.grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(18px,2.4vw,32px);
}
.grid--tight{gap:clamp(10px,1.4vw,18px);}

/* ---------- 11. 文字层级与索引元素 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11.5px;letter-spacing:.26em;text-transform:uppercase;
  color:var(--c-gold);
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--c-gold);}
.section-title{
  font-size:clamp(1.6rem,3vw,2.6rem);
  margin:0 0 18px;
  color:var(--c-ivory);
}
.section-title__accent{font-style:normal;color:var(--c-gold-hi);}
.lede{
  font-size:clamp(1rem,1.2vw,1.15rem);
  line-height:1.9;
  color:var(--c-slate);
  max-width:42em;
}
.prose{max-width:42em;}
.prose p{margin:0 0 1.2em;}
.prose h3{margin:1.8em 0 .6em;font-size:clamp(1.15rem,1.6vw,1.45rem);color:var(--c-ivory);}
.mono{
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.14em;
  color:var(--c-slate);
}
.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;
}
.divider{
  height:1px;border:0;margin:0;
  background:linear-gradient(90deg,var(--c-gold),rgba(212,175,55,0));
}

/* 等宽索引条 */
.index-bar{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 18px;
  padding:10px 0;
  border-top:1px solid var(--line-soft);
  border-bottom:1px solid var(--line-soft);
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--c-slate);
}
.index-bar__key{color:var(--c-gold);}
.index-bar__spacer{flex:1 1 auto;}

/* 面包屑 */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:9px;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.16em;
  color:var(--c-slate);
}
.breadcrumb__sep{color:var(--c-gold);}
.breadcrumb a{transition:color .2s var(--ease);}
.breadcrumb a:hover{color:var(--c-gold-hi);}

/* ---------- 12. 通用组件 ---------- */
.card{
  position:relative;
  padding:clamp(20px,3vw,32px);
  background:var(--c-midnight);
  border:1px solid var(--line-soft);
  transition:border-color .3s var(--ease),background .3s var(--ease),transform .3s var(--ease);
}
.card::after{
  content:"";position:absolute;top:-1px;left:-1px;width:18px;height:18px;
  border-top:1px solid var(--c-gold);border-left:1px solid var(--c-gold);
  pointer-events:none;transition:width .35s var(--ease),height .35s var(--ease);
}
.card:hover{border-color:rgba(212,175,55,.55);background:#102F57;}
.card:hover::after{width:38px;height:38px;}
.card__title{
  margin:0 0 10px;
  font-family:var(--font-serif);font-size:clamp(1.1rem,1.6vw,1.35rem);
  color:var(--c-ivory);
}
.card__meta{
  margin:0;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--c-gold);
}

.tag{
  display:inline-block;
  padding:3px 10px;
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.14em;
  color:var(--c-gold-hi);
}
.tag--jade{border-color:rgba(31,191,143,.5);color:var(--c-jade);}
.tag--purple{border-color:rgba(122,77,255,.55);color:#C3ACFF;}
.tag--amber{border-color:rgba(226,112,58,.5);color:var(--c-amber);}

.notice{
  padding:14px 18px;
  border-left:2px solid var(--c-amber);
  background:rgba(226,112,58,.08);
  font-size:15px;
  color:var(--c-ivory);
}
.notice--ok{border-left-color:var(--c-jade);background:rgba(31,191,143,.08);}

.link-arrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:15px;
  color:var(--c-gold-hi);
  border-bottom:1px solid rgba(212,175,55,.45);
  padding-bottom:2px;
}
.link-arrow::after{
  content:"→";font-family:var(--font-mono);
  transition:transform .25s var(--ease);
}
.link-arrow:hover::after{transform:translateX(4px);}

.stat__num{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(1.8rem,3.4vw,2.8rem);
  line-height:1;
  color:var(--c-gold-hi);
}
.stat__label{
  display:block;
  margin-top:8px;
  font-size:13px;letter-spacing:.1em;
  color:var(--c-slate);
}

/* 标签页 */
.tabs{position:relative;}
.tabs__list{
  display:flex;align-items:stretch;
  border-bottom:1px solid var(--line-soft);
  overflow-x:auto;
  scrollbar-width:none;
}
.tabs__list::-webkit-scrollbar{display:none;}
.tabs__tab{
  position:relative;
  flex:0 0 auto;
  padding:14px 20px;
  border-right:1px solid var(--line-soft);
  font-size:15px;letter-spacing:.05em;white-space:nowrap;
  color:var(--c-slate);
  transition:color .25s var(--ease),background .25s var(--ease);
}
.tabs__tab:first-child{border-left:1px solid var(--line-soft);}
.tabs__tab:hover{color:var(--c-ivory);background:rgba(212,175,55,.06);}
.tabs__tab[aria-selected="true"]{color:var(--c-gold-hi);background:rgba(122,77,255,.12);}
.tabs__tab[aria-selected="true"]::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:linear-gradient(90deg,var(--c-purple),var(--c-gold-hi));
}
.tabs__num{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;
  color:var(--c-gold);margin-right:8px;
}
.tabs__panel{padding:clamp(20px,3vw,32px) 0;}
.tabs__panel[hidden]{display:none;}

/* 图片容器 */
.media{
  position:relative;
  overflow:hidden;
  background:var(--c-midnight);
  border:1px solid var(--line-soft);
}
.media::after{
  content:"";position:absolute;top:-1px;left:-1px;width:22px;height:22px;
  border-top:1px solid var(--c-gold);border-left:1px solid var(--c-gold);
  pointer-events:none;
}
.media > img,
.media > picture > img,
.media > svg{
  width:100%;height:100%;object-fit:cover;display:block;
}
.media--21x9{aspect-ratio:21 / 9;}
.media--16x9{aspect-ratio:16 / 9;}
.media--4x3{aspect-ratio:4 / 3;}
.media--1x1{aspect-ratio:1 / 1;}
.media--3x4{aspect-ratio:3 / 4;}
.media--bleed{min-height:clamp(260px,50vh,540px);}
.media--placeholder{
  background-image:
    repeating-linear-gradient(45deg,rgba(143,163,184,.10) 0 1px,transparent 1px 14px),
    linear-gradient(150deg,#0E2A4D 0%,#071A33 55%,#03070F 100%);
}
.media--glow::before{
  content:"";position:absolute;inset:-20%;pointer-events:none;
  background:
    radial-gradient(circle at 66% 34%,rgba(122,77,255,.35),transparent 55%),
    radial-gradient(circle at 28% 72%,rgba(212,175,55,.26),transparent 52%);
}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:14px 16px;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.16em;
  color:var(--c-ivory);
  background:linear-gradient(180deg,transparent,rgba(3,7,15,.9));
}
figcaption{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.14em;
  color:var(--c-slate);
}

/* ---------- 13. 显现动效契约 ---------- */
html[data-reveal-ready] [data-reveal]{
  opacity:0;
  transform:translateY(24px);
  transition:opacity .5s ease-out,transform .5s ease-out;
}
html[data-reveal-ready] [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 14. 响应式：平板 ---------- */
@media (max-width:1023px){
  .grid{grid-template-columns:repeat(6,minmax(0,1fr));}
  .span-4{grid-column:span 3;}
  .span-6,.span-7,.span-8,.span-12{grid-column:span 6;}

  .site-footer__inner{grid-template-columns:1fr;}
  .site-footer__cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px;}
}

/* ---------- 15. 响应式：移动端导航与页头 ---------- */
@media (max-width:959px){
  .site-header__inner{
    position:relative;z-index:2;
    padding:12px var(--gut) 9px;
  }
  .masthead{grid-template-columns:1fr auto;gap:10px;}
  .masthead__coord{display:none;}
  .masthead__brand{justify-self:start;align-items:flex-start;text-align:left;}
  .header-actions .btn{display:none;}
  .nav-toggle{display:inline-flex;}
  .masthead__meta{justify-content:flex-start;font-size:10px;letter-spacing:.14em;gap:8px;}

  .site-nav{
    position:fixed;inset:0;z-index:1;
    display:flex;flex-direction:column;
    padding:104px var(--gut) 40px;
    overflow-y:auto;
    border-top:0;
    background:linear-gradient(160deg,#03070F 0%,#0E2A4D 58%,#071A33 100%);
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s var(--ease);
  }
  .site-header[data-open="true"] .site-nav{
    opacity:1;visibility:visible;transform:none;
  }
  .site-nav__list{
    flex-direction:column;align-items:stretch;
    max-width:none;padding:0;
  }
  .site-nav__item{
    border-right:0;
    border-bottom:1px solid var(--line-soft);
  }
  .site-nav__item:first-child{border-left:0;border-top:1px solid var(--line-soft);}
  .site-nav__link{
    padding:16px 2px 6px;
    font-family:var(--font-serif);
    font-size:20px;letter-spacing:.08em;
    color:var(--c-ivory);
  }
  .site-nav__link::after{display:none;}
  .site-nav__num{font-size:12px;color:var(--c-gold);}
  .site-nav__desc{
    display:block;
    padding:0 2px 16px;
    font-family:var(--font-sans);
    font-size:13px;line-height:1.7;
    color:var(--c-slate);
  }
  .site-nav__foot{
    display:flex;flex-wrap:wrap;gap:12px;
    margin-top:26px;
  }
  .site-nav__foot .btn{flex:1 1 150px;}
}

/* ---------- 16. 响应式：手机 ---------- */
@media (max-width:639px){
  body{font-size:16px;}
  .grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;}
  .span-4,.span-6,.span-7,.span-8,.span-12{grid-column:span 4;}

  .masthead__brand-cn{letter-spacing:.1em;text-indent:.1em;}
  .masthead__brand-en{letter-spacing:.3em;text-indent:.3em;}

  .index-bar{font-size:10px;gap:6px 12px;}
  .tabs__tab{padding:12px 14px;font-size:14px;}

  .site-footer__cols{grid-template-columns:1fr;gap:26px;}
  .site-footer__legal-inner{flex-direction:column;align-items:flex-start;gap:8px;}
  .site-footer__sig{margin-left:0;}
}

/* ---------- 17. 桌面网格显式声明 ---------- */
@media (min-width:1024px){
  .span-4{grid-column:span 4;}
  .span-6{grid-column:span 6;}
  .span-7{grid-column:span 7;}
  .span-8{grid-column:span 8;}
  .span-12{grid-column:span 12;}
}

/* ---------- 18. 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;
  }
  body::after{display:none;}
  html[data-reveal-ready] [data-reveal]{opacity:1;transform:none;}
}