/* ==========================================================================
   亚新体育入口 · 共享样式表 /assets/site.css
   夜间战术板：深墨绿底 + 荧光青强调 + 信号橙唯一行动点
   ========================================================================== */

/* 1. 变量
   ========================================================================== */
:root{
  --ink:#0B1F1A;
  --ink-2:#12302A;
  --ink-3:#1B4038;
  --cyan:#3BF0C8;
  --cyan-soft:rgba(59,240,200,.45);
  --signal:#FF6A2B;
  --signal-soft:rgba(255,106,43,.42);
  --grid:#8A9A95;
  --muted:#C7D2CE;
  --white:#F2F7F5;
  --paper:#EAF3F0;
  --line:rgba(138,154,149,.24);
  --line-strong:rgba(138,154,149,.46);
  --radius:2px;
  --shell:1280px;
  --gutter:24px;
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --dur:.2s;
  --ease:ease-out;
  --shadow-lift:0 10px 30px rgba(0,0,0,.4);
}

/* 2. 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,dl,dd,figure,blockquote{margin:0;}

ul,ol{padding:0;list-style:none;}

a{color:inherit;text-decoration:none;}

button,input,select,textarea{font:inherit;color:inherit;}

button{background:none;border:0;cursor:pointer;}

img,svg,video{display:block;max-width:100%;}

table{border-collapse:collapse;width:100%;}

/* 3. 基础版式与底纹
   ========================================================================== */
body{
  min-height:100vh;
  background:var(--ink);
  color:var(--white);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(138,154,149,.09) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(138,154,149,.09) 1px,transparent 1px);
  background-size:56px 56px;
  -webkit-mask-image:radial-gradient(ellipse 120% 70% at 50% 0%,#000 30%,transparent 92%);
  mask-image:radial-gradient(ellipse 120% 70% at 50% 0%,#000 30%,transparent 92%);
}

body > *{
  position:relative;
  z-index:1;
}

::selection{background:var(--signal);color:var(--ink);}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:2px;
  border-radius:1px;
}

.visually-hidden{
  position:absolute;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  white-space:nowrap;
  border:0;
}

/* 4. 头部：居中刊头
   ========================================================================== */
.skip-link{
  position:fixed;
  top:8px;
  left:12px;
  z-index:200;
  padding:10px 16px;
  background:var(--cyan);
  color:var(--ink);
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  border-radius:var(--radius);
  transform:translateY(-180%);
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus{transform:translateY(0);}

.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(11,31,26,.95);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}

.scroll-meter{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  overflow:hidden;
}
.scroll-meter__bar{
  display:block;
  width:100%;
  height:100%;
  background:linear-gradient(90deg,var(--cyan),#7ef7dc 55%,var(--signal));
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .12s linear;
}

.masthead{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:24px;
  padding:20px 0 16px;
}

.masthead__stamp{
  display:flex;
  flex-direction:column;
  gap:5px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--grid);
}
.stamp__coord{color:var(--grid);}
.stamp__live{
  display:inline-flex;
  align-items:center;
  gap:7px;
  color:var(--muted);
  letter-spacing:.08em;
}
.dot{
  display:inline-block;
  width:6px;height:6px;
  border-radius:50%;
  background:var(--cyan);
  animation:pulse 2.8s ease-out infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(59,240,200,.5);}
  70%{box-shadow:0 0 0 9px rgba(59,240,200,0);}
  100%{box-shadow:0 0 0 0 rgba(59,240,200,0);}
}

.brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:6px;
  text-align:center;
}
.brand__name{
  font-size:clamp(21px,2.3vw,30px);
  font-weight:800;
  line-height:1.1;
  letter-spacing:-.02em;
  color:var(--white);
  transition:color var(--dur) var(--ease);
}
.brand__tagline{
  font-size:11.5px;
  letter-spacing:.3em;
  color:var(--muted);
  white-space:nowrap;
}
.brand:hover .brand__name{color:var(--cyan);}

.masthead__tools{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:10px;
}

.searchbox{
  position:relative;
  display:flex;
  align-items:center;
  min-width:220px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  background:rgba(18,48,42,.72);
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.searchbox:focus-within{
  border-color:var(--cyan);
  background:var(--ink-2);
}
.searchbox__input{
  width:100%;
  padding:9px 12px 9px 30px;
  background:none;
  border:0;
  font-size:13px;
  letter-spacing:.02em;
  color:var(--white);
  outline:none;
}
.searchbox__input::placeholder{color:rgba(199,210,206,.55);}
.searchbox__input::-webkit-search-cancel-button{-webkit-appearance:none;}
.searchbox__icon{
  position:absolute;
  left:11px;
  width:9px;height:9px;
  border:1.5px solid var(--grid);
  border-radius:50%;
  pointer-events:none;
}
.searchbox__icon::after{
  content:"";
  position:absolute;
  right:-5px;
  bottom:-4px;
  width:6px;height:1.5px;
  background:var(--grid);
  transform:rotate(45deg);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 12px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--muted);
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan);}
.nav-toggle__grid{
  display:grid;
  grid-template-columns:repeat(2,5px);
  grid-template-rows:repeat(2,5px);
  gap:3px;
}
.nav-toggle__grid i{
  display:block;
  background:var(--cyan);
  border-radius:1px;
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.site-header[data-open] .nav-toggle__grid i:nth-child(2),
.site-header[data-open] .nav-toggle__grid i:nth-child(3){opacity:.25;}

.site-nav{
  border-top:1px solid var(--line);
  background:rgba(18,48,42,.42);
}
.site-nav__list{
  display:flex;
  justify-content:center;
  gap:2px;
}
.site-nav__link{
  position:relative;
  display:block;
  padding:12px 18px;
  font-size:14px;
  font-weight:600;
  letter-spacing:.07em;
  color:var(--muted);
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:18px;right:18px;bottom:7px;
  height:1px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur) var(--ease);
}
.site-nav__link:hover{color:var(--white);}
.site-nav__link:hover::after{transform:scaleX(1);}
.site-nav__link[aria-current="page"]{color:var(--cyan);}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);}

/* 5. 页脚
   ========================================================================== */
.site-footer{
  position:relative;
  margin-top:120px;
  padding:64px 0 28px;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,#0B1F1A 0%,#0d2721 100%);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;left:0;
  width:100%;height:1px;
  background:linear-gradient(90deg,transparent,rgba(59,240,200,.6) 45%,transparent);
}

.footer-lattice{
  display:grid;
  grid-template-columns:1.1fr 1.6fr 1.05fr;
  gap:48px;
}

.footer-brand__link{
  display:inline-block;
  font-size:22px;
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--white);
  transition:color var(--dur) var(--ease);
}
.footer-brand__link:hover{color:var(--cyan);}
.footer-brand__tagline{
  margin-top:8px;
  font-size:12px;
  letter-spacing:.28em;
  color:var(--cyan);
}
.footer-brand__note{
  margin-top:16px;
  max-width:34ch;
  font-size:13px;
  line-height:1.7;
  color:var(--muted);
}

.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}
.footer-col__title{
  margin-bottom:14px;
  font-size:12px;
  font-weight:600;
  letter-spacing:.24em;
  color:var(--white);
}
.footer-col__list{display:flex;flex-direction:column;}
.footer-col__link{
  display:inline-block;
  padding:4px 0;
  font-size:14px;
  color:var(--muted);
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.footer-col__link:hover{
  color:var(--cyan);
  transform:translateX(3px);
}

.footer-contact{min-width:0;}
.contact-line{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:8px 10px;
  padding:6px 0;
  font-size:13.5px;
  line-height:1.6;
  color:var(--muted);
  border-bottom:1px solid rgba(138,154,149,.14);
}
.contact-line--note{border-bottom:0;}
.contact-line__key{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--grid);
}
.contact-line__value{
  flex:1 1 auto;
  min-width:0;
  word-break:break-word;
}
.copy-btn{
  flex:0 0 auto;
  padding:3px 9px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--grid);
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.copy-btn:hover{color:var(--cyan);border-color:var(--cyan);}
.copy-btn[data-copied="ok"]{
  color:var(--ink);
  background:var(--cyan);
  border-color:var(--cyan);
}
.copy-btn[data-copied="fail"]{
  color:var(--signal);
  border-color:var(--signal-soft);
}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:52px;
  padding-top:22px;
  border-top:1px solid var(--line);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--grid);
}
.footer-base__item--mute{color:rgba(138,154,149,.72);}

.to-top{
  position:fixed;
  right:22px;
  bottom:22px;
  z-index:60;
  padding:10px 15px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  background:rgba(18,48,42,.95);
  color:var(--muted);
  font-size:12px;
  letter-spacing:.16em;
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),visibility var(--dur);
}
.to-top.is-shown{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}
.to-top:hover{color:var(--cyan);border-color:var(--cyan);}

/* 6. 布局容器
   ========================================================================== */
.shell{
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding:0 var(--gutter);
}
.shell--narrow{max-width:820px;}

.section{
  position:relative;
  padding:96px 0;
}
.section--tight{padding:64px 0;}
.section--loose{padding:160px 0;}

.section--paper{
  background:var(--paper);
  color:var(--ink);
  border-top:1px solid rgba(11,31,26,.12);
  border-bottom:1px solid rgba(11,31,26,.12);
}
.section--paper .plate{
  background:#fff;
  border-color:rgba(11,31,26,.14);
}
.section--paper .plate__text,
.section--paper .lead{color:rgba(11,31,26,.78);}
.section--paper .eyebrow{color:#4c635d;}

.grid{display:grid;gap:32px;}
.grid--7-5{grid-template-columns:7fr 5fr;}
.grid--5-7{grid-template-columns:5fr 7fr;}
.grid--8-4{grid-template-columns:8fr 4fr;}
.grid--3{grid-template-columns:repeat(3,1fr);}
.grid--2{grid-template-columns:repeat(2,1fr);}

.split-aside{
  display:grid;
  grid-template-columns:minmax(0,1fr) 300px;
  gap:48px;
  align-items:start;
}

.rule-slant{
  height:1px;
  margin:48px 0;
  background:linear-gradient(90deg,rgba(59,240,200,.55),rgba(138,154,149,.18) 45%,transparent);
  transform:rotate(-1.2deg);
  transform-origin:left center;
}

/* 7. 文本组件
   ========================================================================== */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.26em;
  color:var(--muted);
}
.eyebrow::before{
  content:"";
  width:18px;height:1px;
  background:var(--cyan);
}

.lead{
  font-size:clamp(17px,1.5vw,20px);
  line-height:1.75;
  color:var(--muted);
  max-width:68ch;
}

.prose{max-width:68ch;}
.prose h2{
  margin:56px 0 18px;
  font-size:clamp(26px,3vw,38px);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.2;
}
.prose h3{
  margin:36px 0 12px;
  font-size:clamp(19px,2vw,24px);
  font-weight:700;
  letter-spacing:-.01em;
  line-height:1.3;
}
.prose p{margin-bottom:18px;}
.prose ul,
.prose ol{margin:0 0 22px;padding-left:22px;}
.prose ul{list-style:none;}
.prose ul li{position:relative;padding-left:16px;margin-bottom:10px;}
.prose ul li::before{
  content:"";
  position:absolute;
  left:0;top:.72em;
  width:5px;height:5px;
  background:var(--cyan);
  border-radius:1px;
}
.prose ol{list-style:decimal;padding-left:24px;}
.prose ol li{margin-bottom:10px;}
.prose a{
  color:var(--cyan);
  border-bottom:1px solid var(--cyan-soft);
  transition:border-color var(--dur) var(--ease);
}
.prose a:hover{border-color:var(--cyan);}
.prose blockquote{
  margin:28px 0;
  padding:16px 22px;
  border-left:2px solid var(--cyan);
  background:rgba(18,48,42,.6);
  color:var(--muted);
}
.prose code{
  font-family:var(--font-mono);
  font-size:.92em;
  padding:2px 6px;
  background:rgba(18,48,42,.75);
  border:1px solid var(--line);
  border-radius:var(--radius);
  color:var(--cyan);
}
.section--paper .prose ul li::before{background:var(--signal);}
.section--paper .prose a{color:#0f6b58;border-bottom-color:rgba(15,107,88,.4);}
.section--paper .prose blockquote{
  background:rgba(11,31,26,.05);
  color:rgba(11,31,26,.78);
}

/* 8. 通用组件
   ========================================================================== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 16px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  font-size:13.5px;
  font-weight:600;
  letter-spacing:.05em;
  color:var(--white);
  white-space:nowrap;
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn:hover{border-color:var(--cyan);color:var(--cyan);}
.btn:active{transform:translateY(1px);}
.btn--signal{
  background:var(--signal);
  border-color:var(--signal);
  color:var(--ink);
  font-weight:700;
}
.btn--signal:hover{
  background:#ff7f49;
  border-color:#ff7f49;
  color:var(--ink);
}
.btn--ghost{color:var(--muted);}
.btn--block{width:100%;}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--line-strong);
  border-radius:1px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--muted);
}
.tag--cyan{color:var(--cyan);border-color:var(--cyan-soft);}
.tag--signal{color:var(--signal);border-color:var(--signal-soft);}

.plate{
  position:relative;
  padding:22px;
  background:var(--ink-2);
  border:1px solid var(--line);
  border-radius:var(--radius);
  transition:transform var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background var(--dur) var(--ease);
}
.plate:hover{
  transform:translateY(-2px);
  border-color:var(--cyan-soft);
  box-shadow:var(--shadow-lift);
}
.plate__index{
  display:block;
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.26em;
  color:var(--grid);
}
.plate__title{
  font-size:19px;
  font-weight:700;
  letter-spacing:-.01em;
  line-height:1.35;
}
.plate__text{
  margin-top:10px;
  font-size:14px;
  line-height:1.7;
  color:var(--muted);
}

.metric{display:block;}
.metric__value{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(40px,6vw,76px);
  line-height:.95;
  letter-spacing:-.02em;
  color:var(--cyan);
}
.metric__value--signal{color:var(--signal);}
.metric__unit{
  margin-left:6px;
  font-size:.36em;
  letter-spacing:.12em;
  color:var(--muted);
}
.metric__label{
  display:block;
  margin-top:12px;
  font-size:12px;
  letter-spacing:.24em;
  color:var(--muted);
}
.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:-.01em;
}

.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding:22px 0 0;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--grid);
}
.breadcrumbs li{display:flex;align-items:center;gap:8px;}
.breadcrumbs li + li::before{
  content:"/";
  color:var(--line-strong);
}
.breadcrumbs a{transition:color var(--dur) var(--ease);}
.breadcrumbs a:hover{color:var(--cyan);}
.breadcrumbs [aria-current="page"]{color:var(--muted);}

/* 时间轴：节点进入视口依次亮起 */
.timeline{
  position:relative;
  padding-left:26px;
}
.timeline::before{
  content:"";
  position:absolute;
  left:5px;top:8px;bottom:8px;
  width:1px;
  background:var(--line-strong);
}
.timeline__node{
  position:relative;
  padding-bottom:28px;
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}
.timeline__node::before{
  content:"";
  position:absolute;
  left:-26px;top:8px;
  width:11px;height:11px;
  border-radius:50%;
  border:1px solid var(--line-strong);
  background:var(--ink);
  transition:background .24s var(--ease),border-color .24s var(--ease),box-shadow .24s var(--ease);
}
.timeline__node:last-child{padding-bottom:0;}
.js-reveal .timeline__node{opacity:.4;transform:translateX(6px);}
.js-reveal .timeline__node.is-lit{opacity:1;transform:none;}
.timeline__node.is-lit::before{
  background:var(--cyan);
  border-color:var(--cyan);
  box-shadow:0 0 0 4px rgba(59,240,200,.12);
}

/* 显现 */
.js-reveal .reveal{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .42s var(--ease),transform .42s var(--ease);
}
.js-reveal .reveal.is-visible{
  opacity:1;
  transform:none;
}

/* 9. 图片容器基础规则
   ========================================================================== */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  background:var(--ink-2);
  border:1px solid var(--line);
  border-radius:var(--radius);
}
.media-frame > img,
.media-frame > video{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(138,154,149,.14) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(138,154,149,.14) 1px,transparent 1px);
  background-size:40px 40px;
}
.media-frame--21x9{aspect-ratio:21 / 9;}
.media-frame--16x9{aspect-ratio:16 / 9;}
.media-frame--4x3{aspect-ratio:4 / 3;}
.media-frame--1x1{aspect-ratio:1 / 1;}
.media-frame--3x4{aspect-ratio:3 / 4;}
.media-frame__placeholder{
  position:absolute;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.26em;
  color:rgba(138,154,149,.7);
}
.figure-caption{
  margin-top:10px;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--grid);
}
.section--paper .media-frame{border-color:rgba(11,31,26,.14);}
.section--paper .figure-caption{color:rgba(11,31,26,.55);}

/* 10. 响应式
   ========================================================================== */
@media (max-width:1279px){
  .searchbox{min-width:180px;}
  .masthead__tools .btn--ghost{display:none;}
  .footer-lattice{grid-template-columns:1fr 1.4fr;gap:38px;}
  .footer-contact{grid-column:1 / -1;}
}

@media (max-width:1023px){
  :root{--gutter:20px;}

  .masthead{
    grid-template-columns:auto 1fr;
    align-items:center;
    gap:14px;
    padding:16px 0 12px;
  }
  .masthead__stamp{display:none;}
  .brand{align-items:flex-start;text-align:left;grid-column:1;}
  .brand__name{font-size:21px;}
  .brand__tagline{font-size:10.5px;letter-spacing:.22em;}
  .nav-toggle{display:inline-flex;grid-column:2;justify-self:end;}
  .masthead__tools{
    grid-column:1 / -1;
    justify-content:flex-start;
    flex-wrap:wrap;
    gap:8px;
  }
  .searchbox{flex:1 1 100%;min-width:0;}
  .masthead__tools .btn--ghost{display:inline-flex;}

  .site-nav{display:none;}
  .site-header[data-open] .site-nav{
    display:block;
    background-color:var(--ink-2);
    background-image:
      linear-gradient(to right,rgba(138,154,149,.1) 1px,transparent 1px),
      linear-gradient(to bottom,rgba(138,154,149,.1) 1px,transparent 1px);
    background-size:40px 40px;
  }
  .site-nav__list{
    flex-direction:column;
    gap:0;
    padding:6px 0 14px;
  }
  .site-nav__link{
    padding:15px 8px;
    font-size:15px;
    letter-spacing:.1em;
    border-bottom:1px solid var(--line);
    color:var(--white);
  }
  .site-nav__link::after{display:none;}
  .site-nav__link[aria-current="page"]{
    padding-left:16px;
    box-shadow:inset 2px 0 0 var(--cyan);
  }

  .section{padding:64px 0;}
  .section--loose{padding:88px 0;}

  .grid--7-5,
  .grid--5-7,
  .grid--8-4,
  .grid--3,
  .grid--2{grid-template-columns:1fr;}

  .split-aside{grid-template-columns:1fr;gap:32px;}

  .site-footer{margin-top:80px;padding:48px 0 24px;}
  .footer-lattice{grid-template-columns:1fr;gap:34px;}
  .footer-nav{grid-template-columns:repeat(2,1fr);gap:24px 20px;}
  .footer-base{flex-direction:column;align-items:flex-start;gap:8px;}
}

@media (max-width:599px){
  :root{--gutter:16px;}
  body{font-size:16px;}

  .brand__tagline{letter-spacing:.16em;}
  .masthead__tools .btn--ghost{padding:9px 12px;font-size:12.5px;}
  .masthead__tools .btn--signal{padding:9px 12px;font-size:12.5px;}

  .metric__value{font-size:clamp(36px,14vw,56px);}

  .plate{padding:18px;}

  .to-top{right:14px;bottom:14px;padding:9px 12px;font-size:11px;}

  .footer-nav{grid-template-columns:1fr;gap:22px;}
}

/* 11. 无障碍与动效降级
   ========================================================================== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
  .js-reveal .reveal,
  .js-reveal .timeline__node{
    opacity:1 !important;
    transform:none !important;
  }
  .dot{animation:none;}
  .plate:hover,
  .footer-col__link:hover{transform:none;}
}