/* ============================================================
   月博登录中心 — /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ============================================================ */

:root{
  --ink:#101816;
  --ink-deep:#0B3B36;
  --ink-deeper:#082A26;
  --tea:#2E6B5E;
  --clay:#A64B2A;
  --clay-deep:#7A2E1D;
  --gold:#E3A72F;
  --gold-hi:#F2C14E;
  --moon:#F4F1E8;
  --paper:#FBFAF5;
  --fog:#C9CFC6;

  --text-mute:#5C6660;
  --line:rgba(16,24,22,.14);
  --line-soft:rgba(16,24,22,.08);
  --line-dark:rgba(244,241,232,.16);
  --line-dark-soft:rgba(244,241,232,.08);
  --tint-moon:rgba(244,241,232,.72);
  --tint-tea:rgba(46,107,94,.10);

  --sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC",Georgia,serif;
  --mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --shell:1200px;
  --pad:clamp(16px,4vw,40px);
  --gap:24px;
  --cut:16px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
hr{border:0;border-top:1px solid var(--line);margin:0}

:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
.site-header :focus-visible,
.site-footer :focus-visible{outline-color:var(--gold-hi)}

body{
  font-family:var(--serif);
  font-size:16.5px;
  line-height:1.85;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,h5{
  font-family:var(--sans);
  font-weight:800;
  line-height:1.18;
  letter-spacing:-.018em;
}
h1{font-size:clamp(2.1rem,4.4vw,3.4rem);letter-spacing:-.032em;line-height:1.06}
h2{font-size:clamp(1.5rem,2.8vw,2.1rem)}
h3{font-size:clamp(1.1rem,1.6vw,1.3rem);letter-spacing:-.01em}
p{max-width:68ch}
strong{font-weight:700}

.mono{
  font-family:var(--mono);
  font-size:.82em;
  letter-spacing:.02em;
  font-variant-numeric:tabular-nums;
}
.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;
}

/* ---------- 跳过链接 ---------- */
.skip-link{
  position:fixed;left:12px;top:10px;z-index:300;
  transform:translateY(-180%);
  padding:10px 18px;
  background:var(--gold);color:var(--ink);
  font-family:var(--sans);font-weight:800;font-size:13px;letter-spacing:.04em;
  border-radius:2px;
  transition:transform .18s ease;
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 通用容器 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--pad);
}

/* ============================================================
   站点头部 —— 三层轨道
   ============================================================ */
.site-header{
  position:relative;
  background:var(--ink-deep);
  color:var(--moon);
  border-bottom:1px solid var(--line-dark);
}

/* 第一层：校验微缩条 */
.rail-bar{
  background:var(--ink-deeper);
  border-bottom:1px solid var(--line-dark-soft);
}
.rail-bar__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  min-height:40px;
  padding-block:6px;
}
.rail-bar__meta{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:8px;
  max-width:none;
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:rgba(244,241,232,.68);
  text-transform:uppercase;
}
.rail-bar__time{color:var(--gold)}
.rail-bar__sep{color:rgba(244,241,232,.28)}
.rail-tick{
  width:7px;height:7px;
  background:var(--gold);
  box-shadow:0 0 0 3px rgba(227,167,47,.18);
  flex:none;
}
.rail-index{
  display:flex;
  align-items:center;
  gap:18px;
}
.rail-index__list{
  display:flex;
  align-items:center;
  gap:16px;
}
.rail-index__link{
  font-family:var(--sans);
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.06em;
  color:rgba(244,241,232,.74);
  padding-block:2px;
  border-bottom:1px solid transparent;
  transition:color .16s ease,border-color .16s ease;
}
.rail-index__link:hover{color:var(--gold-hi);border-bottom-color:var(--gold)}
.rail-index__link[aria-current="page"]{color:var(--gold-hi);border-bottom-color:var(--gold)}
.rail-cta{
  display:inline-flex;
  align-items:center;
  padding:5px 12px;
  background:var(--gold);
  color:var(--ink);
  font-family:var(--sans);
  font-size:12px;
  font-weight:800;
  letter-spacing:.06em;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%);
  transition:background-color .16s ease;
}
.rail-cta:hover{background:var(--gold-hi)}

/* 滚动进度刻度 */
.rail-progress{
  position:fixed;
  top:0;left:0;
  width:100%;
  height:2px;
  background:linear-gradient(90deg,var(--gold),var(--gold-hi));
  transform:scaleX(0);
  transform-origin:0 50%;
  z-index:250;
  pointer-events:none;
}

/* 第二层：品牌署名 */
.masthead{background:var(--ink-deep)}
.masthead__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding-block:16px 14px;
}
.brand{display:inline-flex;align-items:center;gap:14px}
.brand__mark{
  display:grid;
  place-items:center;
  width:42px;height:42px;
  flex:none;
  background:var(--clay);
  color:var(--moon);
  font-family:var(--sans);
  font-size:20px;
  font-weight:900;
  line-height:1;
  clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);
  transition:background-color .18s ease;
}
.brand:hover .brand__mark{background:var(--clay-deep)}
.brand__text{display:flex;flex-direction:column;gap:3px}
.brand__name{
  font-family:var(--sans);
  font-size:clamp(1.05rem,2vw,1.35rem);
  font-weight:900;
  letter-spacing:-.01em;
  line-height:1.2;
  color:var(--moon);
}
.brand__tag{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.18em;
  color:rgba(244,241,232,.52);
}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  border:1px solid var(--line-dark);
  color:var(--moon);
  font-family:var(--sans);
  font-size:12.5px;
  font-weight:800;
  letter-spacing:.14em;
  transition:border-color .16s ease,background-color .16s ease;
}
.nav-toggle:hover{border-color:var(--gold);background:rgba(244,241,232,.06)}
.nav-toggle__bars{
  display:inline-flex;
  flex-direction:column;
  gap:3px;
  width:18px;
}
.nav-toggle__bars span{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform .2s ease,opacity .2s ease,width .2s ease;
}
.nav-toggle__bars span:nth-child(2){width:72%}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(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(-5px) rotate(-45deg)}

/* 第三层：栏目导航 */
.nav-deck{
  background:var(--ink);
  border-top:1px solid var(--line-dark-soft);
}
.nav-deck__inner{
  display:flex;
  align-items:center;
  gap:20px;
  min-height:54px;
}
.nav-deck__list{
  display:flex;
  flex-wrap:wrap;
  align-items:stretch;
  flex:1 1 auto;
}
.nav-deck__item{display:flex}
.nav-deck__link{
  display:inline-flex;
  align-items:baseline;
  gap:8px;
  padding:16px 16px 14px;
  font-family:var(--sans);
  font-size:14.5px;
  font-weight:700;
  letter-spacing:.02em;
  color:rgba(244,241,232,.82);
  border-bottom:2px solid transparent;
  transition:color .16s ease,background-color .16s ease,border-color .16s ease;
}
.nav-deck__link:hover{
  color:var(--gold-hi);
  background:rgba(244,241,232,.05);
}
.nav-deck__link[aria-current="page"]{
  color:var(--moon);
  background:rgba(46,107,94,.55);
  border-bottom-color:var(--gold);
}
.nav-deck__num{
  font-family:var(--mono);
  font-size:10.5px;
  font-weight:500;
  letter-spacing:.08em;
  color:var(--gold);
}
.nav-deck__link[aria-current="page"] .nav-deck__num{color:var(--gold-hi)}
.nav-deck__cta{
  flex:none;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 16px;
  border:1px solid var(--gold);
  color:var(--gold);
  font-family:var(--sans);
  font-size:13px;
  font-weight:800;
  letter-spacing:.06em;
  transition:background-color .16s ease,color .16s ease;
}
.nav-deck__cta:hover{background:var(--gold);color:var(--ink)}

/* ============================================================
   站点页脚
   ============================================================ */
.site-footer{
  background:var(--ink);
  color:var(--moon);
  padding-top:clamp(36px,5vw,60px);
  border-top:3px solid var(--clay);
}

.footer-chain{
  display:grid;
  gap:16px;
  padding:22px 24px;
  background:var(--ink-deep);
  border:1px solid var(--line-dark);
}
.footer-chain__title{
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--gold);
  max-width:none;
}
.footer-chain__list{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:10px;
}
.footer-chain__step{
  display:inline-flex;
  align-items:baseline;
  gap:9px;
}
.footer-chain__step:not(:last-child)::after{
  content:"→";
  font-family:var(--mono);
  font-size:13px;
  color:rgba(244,241,232,.3);
  margin-left:22px;
}
.footer-chain__num{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--clay);
}
.footer-chain__link{
  font-family:var(--sans);
  font-size:15px;
  font-weight:800;
  letter-spacing:.01em;
  color:var(--moon);
  border-bottom:1px dashed rgba(244,241,232,.32);
  padding-bottom:2px;
  transition:color .16s ease,border-color .16s ease;
}
.footer-chain__link:hover{color:var(--gold-hi);border-bottom-color:var(--gold-hi)}

.footer-grid{
  display:grid;
  grid-template-columns:1.3fr 1fr 1fr 1fr 1.5fr;
  gap:clamp(20px,3vw,40px);
  padding-block:clamp(32px,4vw,52px) clamp(28px,3.5vw,44px);
}
.footer-col{display:flex;flex-direction:column;gap:12px}
.footer-col__title{
  font-family:var(--mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--gold);
}
.footer-col__list{display:flex;flex-direction:column;gap:8px}
.footer-col__list a{
  font-family:var(--sans);
  font-size:14.5px;
  color:rgba(244,241,232,.76);
  transition:color .16s ease,padding-left .16s ease;
}
.footer-col__list a:hover{color:var(--gold-hi);padding-left:4px}
.footer-col__list a[aria-current="page"]{color:var(--gold-hi)}
.footer-col__note{
  font-family:var(--serif);
  font-size:14px;
  line-height:1.75;
  color:rgba(244,241,232,.58);
  max-width:32ch;
}
.footer-brand__name{
  font-family:var(--sans);
  font-size:18px;
  font-weight:900;
  letter-spacing:-.01em;
  color:var(--moon);
  max-width:none;
}
.footer-brand__tag{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.22em;
  color:var(--clay);
  max-width:none;
}

.footer-contact{display:flex;flex-direction:column;gap:10px}
.footer-contact__row{
  display:grid;
  grid-template-columns:38px minmax(0,1fr);
  gap:10px;
  align-items:baseline;
  max-width:none;
}
.footer-contact__key{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.1em;
  color:rgba(244,241,232,.42);
}
.footer-contact__val{
  font-family:var(--sans);
  font-size:14px;
  line-height:1.6;
  color:rgba(244,241,232,.82);
  word-break:break-word;
}
.footer-contact__val.mono{font-size:13px;letter-spacing:.01em}

.footer-base{
  border-top:1px solid var(--line-dark-soft);
  background:var(--ink-deeper);
}
.footer-base__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  padding-block:18px;
}
.footer-copy{
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:rgba(244,241,232,.5);
  max-width:none;
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 20px;
}
.footer-legal__link{
  font-family:var(--sans);
  font-size:12.5px;
  color:rgba(244,241,232,.66);
  transition:color .16s ease;
}
.footer-legal__link:hover{color:var(--gold-hi)}
.footer-legal__icp{
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.04em;
  color:rgba(244,241,232,.42);
}

/* ============================================================
   基础组件
   ============================================================ */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--clay);
}
.eyebrow::before{
  content:"";
  width:24px;height:2px;
  background:var(--gold);
  flex:none;
}
.section--dark .eyebrow,
.site-footer .eyebrow{color:var(--gold)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid var(--line);
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--text-mute);
  background:rgba(255,255,255,.4);
  white-space:nowrap;
}
.tag--gold{background:var(--gold);border-color:var(--gold);color:var(--ink);font-weight:700}
.tag--clay{background:var(--clay);border-color:var(--clay);color:var(--moon)}
.tag--tea{background:var(--tea);border-color:var(--tea);color:var(--moon)}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  font-family:var(--sans);
  font-size:14px;
  font-weight:800;
  letter-spacing:.04em;
  border:1px solid transparent;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease,transform .16s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn--gold{background:var(--gold);color:var(--ink)}
.btn--gold:hover{background:var(--gold-hi)}
.btn--ghost{background:transparent;border-color:rgba(244,241,232,.34);color:var(--moon)}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold-hi)}
.btn--line{background:transparent;border-color:rgba(16,24,22,.28);color:var(--ink)}
.btn--line:hover{background:var(--ink);color:var(--moon);border-color:var(--ink)}
.btn--sm{padding:8px 14px;font-size:12.5px}

/* 面包屑 */
.breadcrumb{padding-block:14px 0}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--text-mute);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__link{color:var(--tea);border-bottom:1px solid transparent;transition:border-color .16s ease,color .16s ease}
.breadcrumb__link:hover{color:var(--clay);border-bottom-color:var(--clay)}
.breadcrumb__sep{color:var(--fog)}
.breadcrumb__item:last-child{color:var(--ink)}

/* 章节 */
.page-main{display:block;padding-bottom:clamp(40px,6vw,80px)}
.section{padding-block:clamp(48px,7vw,88px)}
.section--tight{padding-block:clamp(28px,4vw,48px)}
.section--moon{background:var(--moon)}
.section--dark{background:var(--ink-deep);color:var(--moon)}
.section--dark h1,.section--dark h2,.section--dark h3{color:var(--moon)}
.section--dark p{color:rgba(244,241,232,.82)}
.section--dark .tag{border-color:var(--line-dark);color:rgba(244,241,232,.7);background:transparent}

.section__head{display:flex;flex-direction:column;gap:12px;margin-bottom:clamp(24px,3vw,36px)}
.section__title{max-width:24ch}
.section__lead{
  font-family:var(--serif);
  font-size:16px;
  line-height:1.85;
  color:var(--text-mute);
  max-width:58ch;
}
.section--dark .section__lead{color:rgba(244,241,232,.72)}

/* 非对称双栏 */
.split{
  display:grid;
  grid-template-columns:minmax(0,.82fr) minmax(0,1.18fr);
  gap:clamp(20px,3vw,40px);
  align-items:start;
}
.split--reverse{grid-template-columns:minmax(0,1.18fr) minmax(0,.82fr)}
.split--even{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}

/* 面板 */
.panel{
  padding:clamp(18px,2.4vw,28px);
  background:var(--paper);
  border:1px solid var(--line);
}
.panel--dark{background:var(--ink-deep);border-color:var(--line-dark);color:var(--moon)}
.panel--moon{background:var(--moon);border-color:var(--line-soft)}

/* 切角通道卡片 */
.station-card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:12px;
  padding:20px 22px;
  background:var(--paper);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%);
  box-shadow:inset 0 0 0 1px var(--line);
  transition:transform .18s ease,box-shadow .18s ease,background-color .18s ease;
}
.station-card:hover{
  transform:translateY(-2px);
  background:#fff;
  box-shadow:inset 0 0 0 1px var(--tea);
}
.station-card__head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}
.station-card__title{
  font-family:var(--sans);
  font-size:17px;
  font-weight:800;
  letter-spacing:-.01em;
}
.station-card__meta{
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--text-mute);
}
.station-card__foot{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  margin-top:auto;
  padding-top:12px;
  border-top:1px dashed var(--line);
}
.station-card--dark{background:var(--ink-deep);color:var(--moon);box-shadow:inset 0 0 0 1px var(--line-dark)}
.station-card--dark:hover{background:var(--tea);box-shadow:inset 0 0 0 1px var(--gold)}
.station-card--dark .station-card__meta{color:rgba(244,241,232,.62)}
.station-card--dark .station-card__foot{border-top-color:var(--line-dark)}

/* 等宽索引表 */
.index-table{display:flex;flex-direction:column;border-top:1px solid var(--line)}
.index-table__row{
  display:grid;
  grid-template-columns:minmax(96px,.7fr) minmax(0,1.6fr) auto;
  gap:14px;
  align-items:baseline;
  padding:11px 4px;
  border-bottom:1px solid var(--line-soft);
  transition:background-color .14s ease;
}
.index-table__row:hover{background:rgba(46,107,94,.06)}
.index-table__key{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--tea);
}
.index-table__val{font-family:var(--sans);font-size:14.5px;line-height:1.6}
.section--dark .index-table{border-top-color:var(--line-dark)}
.section--dark .index-table__row{border-bottom-color:var(--line-dark-soft)}
.section--dark .index-table__key{color:var(--gold)}
.section--dark .index-table__row:hover{background:rgba(244,241,232,.05)}

/* 纵向时间线 */
.timeline{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:var(--gap);
  padding-left:24px;
}
.timeline::before{
  content:"";
  position:absolute;
  left:5px;top:6px;bottom:6px;
  width:1px;
  background:linear-gradient(180deg,var(--gold),rgba(201,207,198,.5));
}
.timeline__item{position:relative;display:flex;flex-direction:column;gap:6px}
.timeline__node{
  position:absolute;
  left:-24px;top:8px;
  width:11px;height:11px;
  background:var(--paper);
  border:2px solid var(--clay);
  transform:rotate(45deg);
}
.timeline__item:first-child .timeline__node{background:var(--gold);border-color:var(--gold)}
.timeline__body{display:flex;flex-direction:column;gap:4px}
.section--dark .timeline__node{background:var(--ink-deep);border-color:var(--gold)}
.section--dark .timeline::before{background:linear-gradient(180deg,var(--gold),rgba(244,241,232,.2))}

/* 旁注条 */
.note-strip{
  display:flex;
  flex-direction:column;
  gap:6px;
  padding:14px 18px;
  background:var(--moon);
  border-left:3px solid var(--clay);
  font-size:14.5px;
  line-height:1.75;
  color:#3B443F;
}
.note-strip p{max-width:64ch}
.section--dark .note-strip{background:rgba(244,241,232,.06);color:rgba(244,241,232,.84);border-left-color:var(--gold)}

/* 刻度数字条 */
.stat-strip{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(140px,1fr));
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.stat-strip__item{background:var(--paper);padding:16px 18px;display:flex;flex-direction:column;gap:2px}
.stat-strip__num{
  font-family:var(--mono);
  font-size:clamp(1.35rem,2.4vw,1.85rem);
  font-weight:700;
  letter-spacing:-.02em;
  line-height:1.2;
  color:var(--ink-deep);
}
.stat-strip__label{
  font-family:var(--sans);
  font-size:11.5px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--text-mute);
}
.section--dark .stat-strip{background:var(--line-dark);border-color:var(--line-dark)}
.section--dark .stat-strip__item{background:var(--ink-deep)}
.section--dark .stat-strip__num{color:var(--gold)}
.section--dark .stat-strip__label{color:rgba(244,241,232,.6)}

/* 筛选条 */
.filter-bar{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
}
.filter-btn{
  padding:7px 13px;
  border:1px solid var(--line);
  background:transparent;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--text-mute);
  transition:background-color .16s ease,color .16s ease,border-color .16s ease;
}
.filter-btn:hover{border-color:var(--tea);color:var(--tea)}
.filter-btn[aria-pressed="true"]{
  background:var(--tea);
  border-color:var(--tea);
  color:var(--moon);
  box-shadow:inset 0 -2px 0 var(--gold);
}
.section--dark .filter-btn{border-color:var(--line-dark);color:rgba(244,241,232,.7)}
.section--dark .filter-btn:hover{border-color:var(--gold);color:var(--gold-hi)}
.section--dark .filter-btn[aria-pressed="true"]{background:var(--gold);border-color:var(--gold);color:var(--ink)}
.filter-status{
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--text-mute);
}
.section--dark .filter-status{color:rgba(244,241,232,.55)}

/* 标签行 */
.tag-row{display:flex;flex-wrap:wrap;gap:6px}

/* 图片容器基础规则 */
.figure{margin:0;display:flex;flex-direction:column;gap:8px}
.figure__img{
  display:block;
  width:100%;
  aspect-ratio:16/9;
  object-fit:cover;
  border:1px solid var(--line);
  background:
    repeating-linear-gradient(135deg,rgba(11,59,54,.08) 0 2px,transparent 2px 12px),
    linear-gradient(160deg,#DCE5DF 0%,#F1EEE4 58%,#E8DCC6 100%);
}
.figure--wide .figure__img{aspect-ratio:21/9}
.figure--tall .figure__img{aspect-ratio:4/5}
.figure__cap{
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.04em;
  line-height:1.7;
  color:var(--text-mute);
}
.section--dark .figure__img{border-color:var(--line-dark);background:
    repeating-linear-gradient(135deg,rgba(244,241,232,.07) 0 2px,transparent 2px 12px),
    linear-gradient(160deg,#123F39 0%,#0B3B36 60%,#14322D 100%);}
.section--dark .figure__cap{color:rgba(244,241,232,.6)}

/* 工具类 */
.is-hidden{display:none!important}
.stack{display:flex;flex-direction:column;gap:var(--gap)}
.stack--tight{gap:12px}
.row{display:flex;flex-wrap:wrap;align-items:center;gap:12px}
.cluster{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:var(--gap)}

/* 显现动效（需 JS 加 html.js-ready） */
[data-reveal]{transition:opacity .42s ease,transform .42s ease}
html.js-ready [data-reveal]{opacity:0;transform:translateY(12px)}
html.js-ready [data-reveal].is-in{opacity:1;transform:none}
.filter-item.is-in{animation:filter-in .12s ease-out both}
@keyframes filter-in{
  from{opacity:0;transform:translateY(6px)}
  to{opacity:1;transform:none}
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1023px){
  .nav-toggle{display:inline-flex}
  .nav-deck{display:none}
  .nav-deck[data-open="true"]{display:block}
  .nav-deck__inner{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding-block:8px 18px;
  }
  .nav-deck__list{flex-direction:column;width:100%}
  .nav-deck__item{width:100%;border-bottom:1px solid var(--line-dark-soft)}
  .nav-deck__link{
    width:100%;
    padding:15px 4px;
    font-size:15.5px;
    border-bottom:0;
    border-left:3px solid transparent;
  }
  .nav-deck__link[aria-current="page"]{
    background:rgba(46,107,94,.45);
    border-left-color:var(--gold);
    border-bottom-color:transparent;
  }
  .nav-deck__cta{align-self:flex-start;margin-top:16px}

  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}

@media (max-width:860px){
  .rail-index__list{display:none}
  .split,
  .split--reverse,
  .split--even{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:640px){
  body{font-size:16px}
  .rail-bar__meta{font-size:10.5px;letter-spacing:.04em}
  .rail-cta{padding:5px 10px;font-size:11px}
  .masthead__inner{padding-block:14px 12px}
  .brand__mark{width:36px;height:36px;font-size:17px}
  .brand__tag{letter-spacing:.12em;font-size:10px}
  .nav-toggle__label{display:none}
  .nav-toggle{padding:10px}

  .footer-chain{padding:18px 16px}
  .footer-chain__step:not(:last-child)::after{margin-left:10px}
  .footer-chain__list{gap:8px}
  .footer-chain__link{font-size:14px}

  .footer-grid{grid-template-columns:minmax(0,1fr);gap:24px}
  .footer-base__inner{flex-direction:column;align-items:flex-start}
  .footer-legal{gap:8px 16px}

  .index-table__row{grid-template-columns:minmax(0,1fr);gap:2px}
  .timeline{padding-left:20px}
  .timeline__node{left:-20px}
  .section{padding-block:clamp(36px,8vw,56px)}
}

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