/* =========================================================
   6163银河中心 · 共享站点样式
   深空银河蓝 / 星云紫 / 电光青 / 暖金
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,figcaption,blockquote,dl,dd{margin:0;padding:0;}
ul,ol{list-style:none;}
img,svg,video{display:block;max-width:100%;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
a{color:inherit;text-decoration:none;}
table{border-collapse:collapse;width:100%;}

/* ---------- 2. 变量 ---------- */
:root{
  color-scheme:dark;

  --space-ink:#070B1F;
  --space-mid:#0E1635;
  --nebula:#6D5DFB;
  --electric:#35E6E0;
  --gold:#F5B84B;
  --star:#F4F7FF;
  --dusk:#A9B0D6;
  --line:#26305A;
  --ok:#4ADE9B;
  --warn:#FF7A90;

  --line-soft:rgba(38,48,90,.6);
  --panel:rgba(14,22,53,.66);
  --panel-strong:rgba(10,16,40,.92);

  --shell:1180px;
  --gutter:clamp(18px,4vw,48px);
  --radius:2px;

  --font-display:"PingFang SC","Hiragino Sans GB","Noto Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"SF Mono","JetBrains Mono","Roboto Mono",Menlo,Consolas,"Noto Sans Mono",monospace;

  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 3. 基础与中文排版 ---------- */
body{
  min-height:100vh;
  background:var(--space-ink);
  color:var(--star);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.8;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-2;
  pointer-events:none;
  background:
    radial-gradient(1200px 720px at 12% -14%,rgba(109,93,251,.34),transparent 62%),
    radial-gradient(960px 640px at 94% 2%,rgba(53,230,224,.15),transparent 60%),
    radial-gradient(820px 540px at 58% 112%,rgba(109,93,251,.18),transparent 66%),
    linear-gradient(180deg,#070B1F 0%,#0A1130 46%,#070B1F 100%);
}
body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  opacity:.55;
  background-image:
    radial-gradient(1.2px 1.2px at 20% 30%,rgba(244,247,255,.8),transparent 62%),
    radial-gradient(1px 1px at 72% 12%,rgba(244,247,255,.6),transparent 62%),
    radial-gradient(1.4px 1.4px at 44% 78%,rgba(53,230,224,.55),transparent 62%),
    radial-gradient(1px 1px at 88% 62%,rgba(244,247,255,.5),transparent 62%),
    radial-gradient(1.1px 1.1px at 8% 88%,rgba(169,176,214,.55),transparent 62%);
  background-size:340px 340px,260px 260px,420px 420px,300px 300px,380px 380px;
}
h1,h2,h3,h4,h5{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.12;
  letter-spacing:-.01em;
  color:var(--star);
}
h1{font-size:clamp(2.4rem,5.6vw,4.2rem);}
h2{font-size:clamp(1.85rem,3.4vw,2.75rem);line-height:1.18;}
h3{font-size:clamp(1.22rem,2vw,1.6rem);line-height:1.32;}
h4{font-size:1.05rem;line-height:1.5;}
p{max-width:70ch;}
strong{font-weight:600;color:var(--star);}
::selection{background:rgba(53,230,224,.28);color:#fff;}
#main-content{scroll-margin-top:150px;}

/* ---------- 4. 通用文字工具 ---------- */
.mono{
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.14em;
  color:var(--dusk);
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--electric);
}
.eyebrow::before{
  content:"";
  width:26px;
  height:1px;
  background:linear-gradient(90deg,var(--nebula),var(--electric));
}
.display{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(2.7rem,8vw,6.2rem);
  line-height:1.02;
  letter-spacing:-.035em;
}
.lead{
  font-size:clamp(1.02rem,1.5vw,1.18rem);
  line-height:1.85;
  color:var(--dusk);
  max-width:62ch;
}
.note{
  font-size:.85rem;
  line-height:1.6;
  color:var(--dusk);
}
.rule{
  height:1px;
  border:0;
  margin:0;
  background:linear-gradient(90deg,var(--line),rgba(38,48,90,0));
}

/* ---------- 5. 布局 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{
  position:relative;
  padding-block:clamp(40px,6vw,86px);
}
.grid{display:grid;gap:clamp(16px,2.4vw,28px);}
.grid--halves{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--thirds{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(min(100%,256px),1fr));}

/* ---------- 6. 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:16px;
  top:-120px;
  z-index:200;
  padding:10px 20px;
  background:var(--gold);
  color:#14101F;
  font-weight:700;
  font-size:.85rem;
  letter-spacing:.06em;
  border-radius:var(--radius);
  transition:top .22s var(--ease);
}
.skip-link:focus{top:14px;}

/* ---------- 7. 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(7,11,31,.86);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  backdrop-filter:blur(16px) saturate(140%);
  border-bottom:1px solid var(--line);
  transition:background .3s var(--ease),box-shadow .3s var(--ease);
}
.site-header[data-scrolled]{
  background:rgba(7,11,31,.97);
  box-shadow:0 22px 44px -34px rgba(53,230,224,.75);
}

/* 顶部坐标条 */
.header-meta{border-bottom:1px solid var(--line-soft);}
.header-meta__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  min-height:38px;
  padding-block:5px;
}
.header-meta__coord{
  flex:0 0 auto;
  font-size:.7rem;
  letter-spacing:.18em;
  color:rgba(169,176,214,.75);
}
.header-meta__tag{
  max-width:52%;
  overflow:hidden;
  white-space:nowrap;
  text-overflow:ellipsis;
  font-size:.72rem;
  letter-spacing:.14em;
  color:var(--dusk);
}
.header-utility{
  display:flex;
  align-items:center;
  gap:8px;
  flex:0 0 auto;
}
.utility-link{
  font-size:.75rem;
  letter-spacing:.1em;
  color:var(--star);
  padding:2px 2px;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.utility-link:hover{color:var(--electric);border-bottom-color:var(--electric);}
.utility-sep{color:var(--line);font-size:.7rem;}

/* 刊头 */
.masthead{
  position:relative;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:2px;
  text-align:center;
  padding-block:16px 14px;
}
.masthead__eyebrow{
  position:absolute;
  left:var(--gutter);
  top:50%;
  transform:translateY(-50%);
  font-size:.68rem;
  letter-spacing:.22em;
  color:rgba(169,176,214,.72);
}
.masthead__brand{display:block;}
.masthead__name{
  display:block;
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(1.32rem,2.8vw,2rem);
  letter-spacing:.06em;
  line-height:1.2;
  color:var(--star);
  transition:color .22s var(--ease),text-shadow .3s var(--ease);
}
.masthead__line{
  display:block;
  margin-top:5px;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.24em;
  color:var(--dusk);
  transition:color .22s var(--ease);
}
.masthead__brand:hover .masthead__name{
  color:#fff;
  text-shadow:0 0 18px rgba(53,230,224,.55);
}
.masthead__brand:hover .masthead__line{color:var(--electric);}

/* 移动导航按钮 */
.nav-toggle{
  position:absolute;
  right:var(--gutter);
  top:50%;
  transform:translateY(-50%);
  display:none;
  align-items:center;
  gap:8px;
  padding:8px 12px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:rgba(14,22,53,.78);
  color:var(--star);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.16em;
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--electric);color:var(--electric);}
.nav-toggle__bars{
  display:inline-flex;
  flex-direction:column;
  justify-content:space-between;
  gap:3px;
  width:16px;
  height:11px;
}
.nav-toggle__bars span{
  display:block;
  height:1.5px;
  width:100%;
  background:currentColor;
  transition:transform .26s var(--ease),opacity .2s var(--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;}

/* 主导航 */
.primary-nav{border-top:1px solid var(--line-soft);}
.nav-list{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  align-items:center;
  gap:clamp(10px,2.2vw,34px);
}
.nav-list__item{display:block;}
.nav-link{
  position:relative;
  display:inline-block;
  padding:13px 2px 15px;
  font-size:.92rem;
  letter-spacing:.06em;
  color:var(--dusk);
  transition:color .2s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:7px;
  height:2px;
  border-radius:2px;
  background:linear-gradient(90deg,var(--nebula),var(--electric));
  transform:scaleX(0);
  transform-origin:center;
  transition:transform .28s var(--ease),box-shadow .28s var(--ease);
}
.nav-link:hover{color:var(--star);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link[aria-current="page"]{color:var(--star);}
.nav-link[aria-current="page"]::after{
  transform:scaleX(1);
  box-shadow:0 0 14px rgba(53,230,224,.8);
}

/* 阅读进度 */
.scroll-progress{
  height:2px;
  width:100%;
  background:rgba(38,48,90,.5);
  overflow:hidden;
}
.scroll-progress__bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--nebula),var(--electric));
  box-shadow:0 0 14px rgba(53,230,224,.75);
  transition:width .12s linear;
}

/* ---------- 8. 按钮与标签 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:13px 26px;
  font-family:var(--font-display);
  font-size:.95rem;
  font-weight:600;
  letter-spacing:.05em;
  line-height:1.2;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:rgba(14,22,53,.82);
  color:var(--star);
  transition:transform .2s var(--ease),border-color .2s var(--ease),box-shadow .28s var(--ease),background .2s var(--ease),color .2s var(--ease);
}
.btn:hover{
  transform:translateY(-2px);
  border-color:var(--electric);
  box-shadow:0 16px 32px -22px rgba(53,230,224,.95);
}
.btn--gold{
  background:linear-gradient(180deg,#F5B84B,#E0A02E);
  border-color:rgba(245,184,75,.9);
  color:#14101F;
}
.btn--gold:hover{
  border-color:#FFD480;
  color:#0C0A14;
  box-shadow:0 18px 36px -20px rgba(245,184,75,.85);
}
.btn--ghost{
  background:transparent;
  border-color:rgba(53,230,224,.42);
  color:var(--electric);
}
.btn--ghost:hover{background:rgba(53,230,224,.09);}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(14,22,53,.62);
  color:var(--dusk);
}
.tag--cyan{
  color:var(--electric);
  border-color:rgba(53,230,224,.45);
  background:rgba(53,230,224,.09);
}
.tag--gold{
  color:var(--gold);
  border-color:rgba(245,184,75,.45);
  background:rgba(245,184,75,.09);
}

/* ---------- 9. 卡片 ---------- */
.card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:14px;
  padding:clamp(20px,3vw,30px);
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow:hidden;
  transition:transform .25s var(--ease),border-color .25s var(--ease),box-shadow .3s var(--ease),background .25s var(--ease);
}
.card::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(53,230,224,.6),transparent);
  opacity:0;
  transition:opacity .3s var(--ease);
}
.card:hover{
  transform:translateY(-4px);
  border-color:rgba(53,230,224,.55);
  background:rgba(16,26,60,.8);
  box-shadow:0 30px 54px -38px rgba(53,230,224,.8);
}
.card:hover::before{opacity:1;}
.card__index{
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.22em;
  color:var(--nebula);
}
.card__title{
  font-family:var(--font-display);
  font-weight:700;
  font-size:1.2rem;
  line-height:1.35;
  letter-spacing:0;
  color:var(--star);
}
.card__body{
  font-size:.95rem;
  line-height:1.78;
  color:var(--dusk);
}
.card__meta{
  margin-top:auto;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.12em;
  color:rgba(169,176,214,.85);
}

/* ---------- 10. 图像容器基础 ---------- */
.media{
  position:relative;
  margin:0;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(160deg,rgba(14,22,53,.92),rgba(7,11,31,.94));
  overflow:hidden;
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:
    radial-gradient(120% 90% at 82% 0%,rgba(53,230,224,.16),transparent 62%),
    radial-gradient(100% 80% at 0% 100%,rgba(109,93,251,.22),transparent 66%);
}
.media__frame{
  position:relative;
  aspect-ratio:16/9;
  display:grid;
  place-items:center;
  overflow:hidden;
  background-image:
    linear-gradient(rgba(38,48,90,.42) 1px,transparent 1px),
    linear-gradient(90deg,rgba(38,48,90,.42) 1px,transparent 1px);
  background-size:46px 46px;
  background-position:center;
}
.media__frame--tall{aspect-ratio:4/5;}
.media__frame img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media__cap{
  position:relative;
  z-index:1;
  padding:11px 16px;
  border-top:1px solid var(--line);
  background:rgba(7,11,31,.66);
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.12em;
  color:var(--dusk);
}

/* ---------- 11. 面包屑与内页首屏 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.12em;
  color:var(--dusk);
}
.breadcrumb__link{
  color:var(--dusk);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.breadcrumb__link:hover{color:var(--electric);border-bottom-color:var(--electric);}
.breadcrumb__sep{color:var(--line);}
.breadcrumb__current{color:var(--star);}

.page-head{
  display:grid;
  gap:18px;
  padding-block:clamp(32px,5vw,64px) clamp(22px,3vw,38px);
  border-bottom:1px solid var(--line);
}
.page-head__title{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(2rem,5vw,3.5rem);
  line-height:1.08;
  letter-spacing:-.025em;
}

/* ---------- 12. 标签页 ---------- */
.tabs{display:grid;gap:18px;}
.tabs__list{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
}
.tabs__tab{
  padding:8px 16px;
  border:1px solid transparent;
  border-radius:var(--radius);
  font-size:.86rem;
  letter-spacing:.06em;
  color:var(--dusk);
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease),box-shadow .2s var(--ease);
}
.tabs__tab:hover{color:var(--star);border-color:var(--line);}
.tabs__tab[aria-selected="true"]{
  color:var(--star);
  border-color:rgba(53,230,224,.5);
  background:rgba(53,230,224,.1);
  box-shadow:inset 0 -1px 0 var(--electric);
}
.tabs__panel[hidden]{display:none;}

/* ---------- 13. 进入视线 ---------- */
.is-js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
.is-js [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 14. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,110px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(14,22,53,.78),rgba(7,11,31,.98));
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(109,93,251,.7),rgba(53,230,224,.7),transparent);
}
.footer-grid{
  display:grid;
  grid-template-columns:1.25fr .95fr 1.1fr;
  gap:clamp(24px,4vw,52px);
  padding-block:clamp(36px,5vw,64px);
}
.footer-brand__link{
  display:inline-block;
  font-family:var(--font-display);
  font-weight:700;
  font-size:1.5rem;
  letter-spacing:.06em;
  color:var(--star);
  transition:color .22s var(--ease),text-shadow .3s var(--ease);
}
.footer-brand__link:hover{color:#fff;text-shadow:0 0 18px rgba(53,230,224,.6);}
.footer-brand__note{
  margin-top:12px;
  font-size:.85rem;
  letter-spacing:.1em;
  color:var(--dusk);
}
.footer-brand__status{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-top:18px;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.14em;
  color:var(--dusk);
}
.status-dot{
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--ok);
  box-shadow:0 0 10px rgba(74,222,155,.9);
}
.footer-nav__title,
.footer-contact__title{
  margin-bottom:16px;
  font-family:var(--font-mono);
  font-size:.7rem;
  font-weight:500;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--nebula);
}
.footer-nav__list{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:10px 20px;
}
.footer-nav__link{
  display:inline-block;
  font-size:.9rem;
  color:var(--dusk);
  padding-bottom:2px;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-nav__link:hover{color:var(--electric);border-bottom-color:var(--electric);}
.footer-contact{
  display:grid;
  align-content:start;
  gap:8px;
}
.footer-contact__row{
  display:grid;
  gap:2px;
  max-width:none;
}
.footer-contact__label{
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.2em;
  color:rgba(169,176,214,.8);
}
.footer-contact__value{
  font-family:var(--font-mono);
  font-size:.82rem;
  letter-spacing:.03em;
  line-height:1.65;
  color:var(--star);
  overflow-wrap:anywhere;
}
.footer-contact__note{
  margin-top:8px;
  max-width:36ch;
  font-size:.78rem;
  line-height:1.7;
  color:var(--dusk);
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 20px;
  padding-block:18px 28px;
  border-top:1px solid var(--line-soft);
  font-size:.78rem;
  color:var(--dusk);
}
.footer-legal__copy{font-size:.78rem;letter-spacing:.06em;}
.footer-legal__links{
  display:flex;
  flex-wrap:wrap;
  gap:16px;
}
.footer-legal__links a{
  color:var(--dusk);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-legal__links a:hover{color:var(--electric);border-bottom-color:var(--electric);}
.footer-legal__icp{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.08em;
  color:rgba(169,176,214,.9);
}

/* ---------- 15. 返回顶部 ---------- */
.to-top{
  position:fixed;
  right:clamp(14px,3vw,32px);
  bottom:clamp(14px,3vw,32px);
  z-index:70;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 16px;
  border:1px solid var(--line);
  border-radius:999px;
  background:var(--panel-strong);
  color:var(--dusk);
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.16em;
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  transition:opacity .3s var(--ease),transform .3s var(--ease),color .2s var(--ease),border-color .2s var(--ease),box-shadow .3s var(--ease),visibility .3s;
}
.to-top[data-visible]{
  opacity:1;
  visibility:visible;
  transform:none;
}
.to-top:hover{
  color:var(--electric);
  border-color:var(--electric);
  box-shadow:0 0 26px -10px rgba(53,230,224,.9);
}

/* ---------- 16. 焦点可见 ---------- */
:where(a,button,[tabindex],summary):focus-visible{
  outline:2px solid var(--electric);
  outline-offset:3px;
  border-radius:2px;
}
.skip-link:focus-visible{outline-color:#14101F;}

/* ---------- 17. 响应式 ---------- */
@media (max-width:1080px){
  .masthead__eyebrow{display:none;}
}
@media (max-width:960px){
  .footer-grid{grid-template-columns:1fr 1fr;}
  .footer-contact{grid-column:1 / -1;}
}
@media (max-width:899px){
  .nav-toggle{display:inline-flex;}
  .primary-nav{
    display:none;
    border-top:1px solid var(--line);
    background:rgba(8,13,34,.99);
  }
  .primary-nav[data-open]{display:block;}
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding-block:6px 16px;
  }
  .nav-link{
    display:block;
    padding:14px 4px;
    font-size:1rem;
    border-bottom:1px solid rgba(38,48,90,.42);
  }
  .nav-link::after{display:none;}
  .nav-link[aria-current="page"]{
    color:var(--electric);
    border-bottom-color:rgba(53,230,224,.55);
    background:linear-gradient(90deg,rgba(53,230,224,.12),transparent 70%);
    box-shadow:inset 2px 0 0 var(--electric);
  }
  .grid--halves,.grid--thirds{grid-template-columns:1fr;}
  .header-meta__coord{display:none;}
  .header-meta__tag{max-width:60%;}
}
@media (max-width:760px){
  body{font-size:16px;}
  .header-meta__tag{display:none;}
  .header-meta__inner{justify-content:flex-end;}
  .footer-grid{grid-template-columns:1fr;gap:28px;}
  .footer-contact{grid-column:auto;}
  .footer-legal{flex-direction:column;align-items:flex-start;gap:10px;}
  .to-top{padding:9px 14px;font-size:.66rem;}
}
@media (max-width:520px){
  .masthead{padding-block:14px 12px;}
  .masthead__line{letter-spacing:.16em;font-size:.6rem;}
  .nav-toggle{padding:7px 10px;letter-spacing:.1em;}
  .nav-toggle__label{display:none;}
  .footer-nav__list{grid-template-columns:1fr;}
}

/* ---------- 18. 减少动态 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
  .is-js [data-reveal]{opacity:1;transform:none;}
  .card:hover{transform:none;}
  .btn:hover{transform:none;}
  .to-top{transform:none;}
}