/* ==========================================================================
   电玩城平台 · 共享样式 /assets/site.css
   夜间街机终端：霓虹紫 / 电光青 / 街机橙 / 像素黄 · 锐利直角 · 精密网格
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root{
  --ink:#07060F;
  --band-deep:#0F1B2E;
  --band-indigo:#1B0F2E;
  --band-wine:#2A0E1E;

  --violet:#B14BFF;
  --cyan:#22E6D8;
  --orange:#FF7A2F;
  --yellow:#FFD84D;

  --text:#E8ECF5;
  --muted:#A7B0C4;
  --line:#3A2E5C;
  --line-soft:rgba(58,46,92,.55);

  --maxw:1240px;
  --gutter:24px;

  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"DejaVu Sans Mono","Courier New",monospace;
  --font-display:var(--font-mono);

  --glow-violet:0 0 22px -4px rgba(177,75,255,.75);
  --glow-cyan:0 0 18px -4px rgba(34,230,216,.7);
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{margin:0;}
h1,h2,h3,h4,h5,h6,p,ul,ol,dl,dd,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
a{color:inherit;}
img,picture,video,svg{display:block;max-width:100%;}
button{font:inherit;color:inherit;background:none;border:0;}
table{border-collapse:collapse;border-spacing:0;}
[id]{scroll-margin-top:132px;}

/* ---------- 3. 基础排版 ---------- */
body{
  background-color:var(--ink);
  background-image:
    radial-gradient(1180px 620px at 82% -8%, rgba(177,75,255,.15), transparent 62%),
    radial-gradient(920px 540px at 4% 2%, rgba(34,230,216,.09), transparent 60%);
  background-repeat:no-repeat;
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.85;
  letter-spacing:.01em;
  min-height:100vh;
  overflow-x:hidden;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:9999;
  pointer-events:none;
  background:repeating-linear-gradient(to bottom, rgba(232,236,245,.035) 0 1px, transparent 1px 4px);
  opacity:.6;
}

::selection{background:var(--violet);color:#07060F;}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
}

.mono{font-family:var(--font-mono);letter-spacing:.05em;}
.num{font-variant-numeric:tabular-nums;}

/* ---------- 4. 跳转链接 ---------- */
.skip-link{
  position:absolute;
  top:-120px;
  left:16px;
  z-index:400;
  padding:10px 18px;
  background:var(--yellow);
  color:#07060F;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
  text-decoration:none;
  transition:top .18s ease;
}
.skip-link:focus,
.skip-link:focus-visible{
  top:10px;
  outline:2px solid var(--cyan);
  outline-offset:2px;
}

/* ---------- 5. 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:120;
  background:rgba(7,6,15,.94);
  -webkit-backdrop-filter:blur(8px) saturate(1.25);
  backdrop-filter:blur(8px) saturate(1.25);
  border-bottom:1px solid var(--line);
}
.site-header::before{
  content:"";
  position:absolute;
  left:0;right:0;top:0;
  height:1px;
  background:linear-gradient(90deg,var(--violet),var(--cyan) 42%,rgba(255,216,77,.55) 74%,rgba(58,46,92,0) 100%);
  opacity:.9;
  pointer-events:none;
}

.header-frame{
  display:flex;
  align-items:center;
  gap:22px;
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:11px var(--gutter);
}

/* 品牌 */
.brand-block{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
  color:var(--text);
}
.brand-mark{
  display:block;
  width:16px;
  height:16px;
  background:var(--violet);
  box-shadow:
    0 0 0 1px #0B0817,
    7px -7px 0 -2px var(--cyan),
    -7px 7px 0 -2px var(--yellow);
  transition:box-shadow .25s ease;
}
.brand:hover .brand-mark{
  box-shadow:
    0 0 0 1px #0B0817,
    7px -7px 0 -2px var(--cyan),
    -7px 7px 0 -2px var(--yellow),
    0 0 20px rgba(177,75,255,.85);
}
.brand-name{
  font-family:var(--font-display);
  font-size:21px;
  font-weight:800;
  letter-spacing:.14em;
  line-height:1;
  text-shadow:0 0 18px rgba(177,75,255,.55);
}
.brand-scale{
  display:block;
  width:7px;
  height:26px;
  border-left:1px solid var(--cyan);
  background-image:repeating-linear-gradient(to bottom,var(--line) 0 1px,transparent 1px 5px);
}

/* 版本时间轴 */
.version-rail{
  flex:1 1 auto;
  min-width:0;
}
.version-rail__list{
  display:flex;
  align-items:center;
  gap:14px;
  margin:0;
  padding:2px 0;
  overflow-x:auto;
  overflow-y:hidden;
  scrollbar-width:none;
  -ms-overflow-style:none;
}
.version-rail__list::-webkit-scrollbar{display:none;}

.version-node{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:5px 10px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.025);
  color:var(--muted);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  text-decoration:none;
  white-space:nowrap;
  transition:padding .25s ease,font-size .25s ease,border-color .2s ease,background-color .2s ease;
}
.version-node:hover{
  background:rgba(177,75,255,.12);
  border-color:var(--violet);
}
.version-node__dot{
  display:block;
  width:6px;
  height:6px;
  background:var(--muted);
  flex:0 0 auto;
}
.version-node__kind{color:var(--muted);}
.version-node__num{
  color:var(--text);
  font-weight:700;
  font-variant-numeric:tabular-nums;
}
.version-node[data-kind="stable"] .version-node__dot{background:var(--cyan);box-shadow:0 0 8px var(--cyan);}
.version-node[data-kind="stable"]{border-color:rgba(34,230,216,.4);}
.version-node[data-kind="beta"] .version-node__dot{background:var(--orange);box-shadow:0 0 8px var(--orange);}
.version-node[data-kind="beta"]{border-color:rgba(255,122,47,.4);}
.version-node[data-kind="legacy"] .version-node__dot{background:var(--violet);box-shadow:0 0 8px var(--violet);}
.version-node[data-kind="legacy"]{border-color:rgba(177,75,255,.4);}

/* 滚动后时间轴收窄为细线状 */
.site-header[data-scrolled="true"] .version-node{padding:2px 8px;font-size:10px;}
.site-header[data-scrolled="true"] .version-node__kind{display:none;}

/* 工具区 */
.header-tools{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}
.search-capsule{
  display:inline-flex;
  align-items:center;
  gap:9px;
  height:34px;
  padding:0 14px 0 12px;
  border:1px solid rgba(34,230,216,.5);
  background:rgba(34,230,216,.07);
  color:var(--text);
  font-size:12.5px;
  letter-spacing:.06em;
  text-decoration:none;
  white-space:nowrap;
  transition:background-color .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.search-capsule:hover{
  background:rgba(34,230,216,.16);
  border-color:var(--cyan);
  box-shadow:var(--glow-cyan);
}
.search-capsule__icon{
  position:relative;
  display:block;
  width:9px;
  height:9px;
  border:1.5px solid currentColor;
  flex:0 0 auto;
}
.search-capsule__icon::after{
  content:"";
  position:absolute;
  left:6px;
  top:6px;
  width:5px;
  height:1.5px;
  background:currentColor;
  transform:rotate(45deg);
  transform-origin:left center;
}
.search-capsule__text{line-height:1;}

.version-badge{
  display:inline-flex;
  align-items:center;
  height:34px;
  padding:0 12px;
  border:1px solid rgba(255,216,77,.5);
  background:rgba(255,216,77,.08);
  color:var(--yellow);
  font-family:var(--font-mono);
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.06em;
  font-variant-numeric:tabular-nums;
  white-space:nowrap;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  height:34px;
  padding:0 12px;
  border:1px solid var(--line);
  color:var(--muted);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  cursor:pointer;
  transition:border-color .2s ease,color .2s ease,background-color .2s ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--text);background:rgba(34,230,216,.08);}
.nav-toggle__bars{
  display:inline-flex;
  flex-direction:column;
  gap:3px;
  width:14px;
}
.nav-toggle__bar{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform .2s ease,opacity .2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

/* 导航条 */
.nav-bar{
  width:100%;
  border-top:1px solid var(--line);
  background:linear-gradient(90deg,rgba(15,27,46,.55),rgba(27,15,46,.55) 60%,rgba(7,6,15,.35));
}
.primary-nav{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--gutter);
}
.primary-nav__list{
  display:flex;
  flex-wrap:wrap;
  align-items:stretch;
}
.primary-nav__list > li{
  display:flex;
  align-items:stretch;
}
.primary-nav__list > li + li{border-left:1px solid var(--line-soft);}
.primary-nav__list > li:first-child > .primary-nav__link{padding-left:0;}

.primary-nav__link{
  position:relative;
  display:flex;
  align-items:center;
  padding:11px 22px;
  color:var(--muted);
  font-size:13.5px;
  font-weight:600;
  letter-spacing:.08em;
  text-decoration:none;
  transition:color .2s ease,background-color .2s ease;
}
.primary-nav__link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:linear-gradient(90deg,var(--violet),var(--cyan));
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .22s ease;
}
.primary-nav__link:hover{color:var(--text);background-color:rgba(177,75,255,.1);}
.primary-nav__link:hover::after,
.primary-nav__link:focus-visible::after{transform:scaleX(1);}

.primary-nav__link[aria-current="page"]{
  color:var(--text);
  background-color:rgba(177,75,255,.15);
}
.primary-nav__link[aria-current="page"]::after{
  transform:scaleX(1);
  box-shadow:0 0 12px rgba(177,75,255,.85);
}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,96px);
  background:linear-gradient(180deg,#0A0818 0%,var(--band-indigo) 44%,#06050D 100%);
  border-top:1px solid var(--line);
}
.footer-scanline{
  height:6px;
  background-image:repeating-linear-gradient(to right,rgba(177,75,255,.6) 0 1px,transparent 1px 8px);
  opacity:.6;
}
.footer-frame{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:clamp(34px,5vw,56px) var(--gutter) 28px;
}
.footer-brand{
  display:flex;
  align-items:baseline;
  gap:16px;
  flex-wrap:wrap;
  padding-bottom:26px;
  border-bottom:1px solid var(--line);
}
.footer-brand__name{
  font-family:var(--font-display);
  font-size:26px;
  font-weight:800;
  letter-spacing:.16em;
  line-height:1.1;
  color:var(--text);
  text-shadow:0 0 20px rgba(177,75,255,.5);
}
.footer-brand__tagline{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.14em;
  color:var(--cyan);
}

.footer-grid{
  display:grid;
  grid-template-columns:1fr 1fr 1.7fr;
  gap:36px;
  padding:34px 0 30px;
}
.footer-col__title{
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:700;
  letter-spacing:.24em;
  color:var(--cyan);
  margin-bottom:16px;
}
.footer-links li + li{margin-top:10px;}
.footer-links a{
  position:relative;
  display:inline-block;
  padding-left:14px;
  color:var(--muted);
  font-size:14px;
  text-decoration:none;
  transition:color .2s ease;
}
.footer-links a::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  width:6px;
  height:1px;
  background:var(--violet);
  transform:translateY(-50%);
  transition:width .2s ease,background-color .2s ease;
}
.footer-links a:hover{color:var(--text);}
.footer-links a:hover::before{width:10px;background:var(--cyan);}

.footer-contact{display:grid;gap:10px;}
.footer-contact__row{
  display:grid;
  grid-template-columns:62px minmax(0,1fr);
  gap:10px;
  align-items:start;
}
.footer-contact__label{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.16em;
  color:var(--orange);
  padding-top:2px;
}
.footer-contact__value{
  color:var(--muted);
  font-size:13.5px;
  line-height:1.7;
  word-break:break-word;
}

.footer-meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px 26px;
  padding-top:22px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--muted);
}
.footer-meta__nav{
  display:flex;
  flex-wrap:wrap;
  gap:18px;
}
.footer-meta__nav a{
  color:var(--muted);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.footer-meta__nav a:hover{color:var(--cyan);border-bottom-color:var(--cyan);}
.footer-meta__copy{margin-left:auto;color:rgba(167,176,196,.75);}

/* ---------- 7. 返回顶部 ---------- */
.to-top{
  position:fixed;
  right:20px;
  bottom:20px;
  z-index:150;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  width:54px;
  height:54px;
  border:1px solid var(--violet);
  background:rgba(27,15,46,.94);
  color:var(--text);
  font-family:var(--font-mono);
  cursor:pointer;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%);
  opacity:0;
  visibility:hidden;
  transform:translateY(12px);
  transition:opacity .24s ease,transform .24s ease,visibility .24s,border-color .2s ease,background-color .2s ease;
}
.to-top[data-visible="true"]{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}
.to-top:hover{
  border-color:var(--cyan);
  background:rgba(34,230,216,.14);
}
.to-top__glyph{
  font-size:16px;
  line-height:1;
  color:var(--cyan);
}
.to-top__label{
  font-size:10px;
  letter-spacing:.14em;
  color:var(--muted);
}

/* ---------- 8. 通用布局 ---------- */
.content-shell{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--gutter);
}
.section{padding:clamp(48px,8vw,104px) 0;}
.section--deep{background:var(--band-deep);}
.section--indigo{background:var(--band-indigo);}
.section--wine{background:var(--band-wine);}

.section-band{
  position:relative;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  background:linear-gradient(90deg,rgba(177,75,255,.16),rgba(34,230,216,.06) 52%,rgba(7,6,15,0) 100%);
  padding:18px 0;
}
.section-band__inner{
  display:flex;
  align-items:baseline;
  gap:18px;
  flex-wrap:wrap;
}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gutter);
}
.col-span-4{grid-column:span 4;}
.col-span-5{grid-column:span 5;}
.col-span-7{grid-column:span 7;}
.col-span-8{grid-column:span 8;}
.col-span-12{grid-column:span 12;}

.note-rail{
  border-left:1px solid var(--line);
  padding-left:18px;
  font-size:13.5px;
  color:var(--muted);
}

/* ---------- 9. 通用文本组件 ---------- */
.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.24em;
  color:var(--cyan);
  text-transform:uppercase;
}
.h-display{
  font-family:var(--font-display);
  font-size:clamp(2rem,5.4vw,3.5rem);
  font-weight:800;
  line-height:1.14;
  letter-spacing:.03em;
  color:var(--text);
  text-shadow:0 0 22px rgba(177,75,255,.4);
}
.h-xl{
  font-family:var(--font-display);
  font-size:clamp(1.75rem,3.4vw,2.5rem);
  font-weight:800;
  line-height:1.2;
  letter-spacing:.03em;
  color:var(--text);
}
.h-lg{
  font-family:var(--font-display);
  font-size:clamp(1.375rem,2.2vw,1.75rem);
  font-weight:700;
  line-height:1.28;
  letter-spacing:.03em;
  color:var(--violet);
}
.h-md{
  font-family:var(--font-body);
  font-size:1.25rem;
  font-weight:700;
  line-height:1.5;
  color:var(--text);
}
.lede{
  font-size:clamp(1rem,1.4vw,1.125rem);
  line-height:1.85;
  color:var(--muted);
  max-width:60ch;
}
.prose p{margin:0 0 20px;max-width:68ch;}
.prose p:last-child{margin-bottom:0;}
.prose strong{color:var(--yellow);font-weight:700;}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb{
  padding:22px 0 0;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.05em;
  color:var(--muted);
}
.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
.breadcrumb li + li::before{
  content:"/";
  margin-right:8px;
  color:var(--line);
}
.breadcrumb a{
  color:var(--muted);
  text-decoration:none;
  transition:color .2s ease;
}
.breadcrumb a:hover{color:var(--cyan);}

/* ---------- 11. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:12px 22px;
  border:1px solid var(--violet);
  background:rgba(177,75,255,.14);
  color:var(--text);
  font-family:var(--font-body);
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .2s ease,border-color .2s ease,color .2s ease,box-shadow .2s ease;
}
.btn:hover{
  background:rgba(177,75,255,.3);
  box-shadow:0 0 0 1px var(--violet),var(--glow-violet);
}
.btn--primary{
  background:var(--violet);
  border-color:var(--violet);
  color:#0A0614;
}
.btn--primary:hover{background:#C46BFF;color:#0A0614;}
.btn--ghost{
  background:transparent;
  border-color:var(--line);
  color:var(--muted);
}
.btn--ghost:hover{
  background:rgba(34,230,216,.09);
  border-color:var(--cyan);
  color:var(--text);
  box-shadow:var(--glow-cyan);
}
.btn--sm{padding:8px 14px;font-size:12.5px;}

/* ---------- 12. 面板与标记 ---------- */
.panel{
  position:relative;
  border:1px solid var(--line);
  background:rgba(255,255,255,.028);
  padding:clamp(18px,3vw,28px);
}
.frame-corners{
  --tick-color:var(--cyan);
  position:relative;
}
.frame-corners::before,
.frame-corners::after{
  content:"";
  position:absolute;
  width:14px;
  height:14px;
  border:1px solid var(--tick-color);
  pointer-events:none;
}
.frame-corners::before{top:0;left:0;border-right:0;border-bottom:0;}
.frame-corners::after{bottom:0;right:0;border-left:0;border-top:0;}

/* ---------- 13. 标签 ---------- */
.tag{
  display:inline-block;
  padding:3px 9px;
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  line-height:1.6;
  color:var(--muted);
}
.tag--stable{color:var(--cyan);border-color:rgba(34,230,216,.45);}
.tag--beta{color:var(--orange);border-color:rgba(255,122,47,.45);}
.tag--legacy{color:var(--violet);border-color:rgba(177,75,255,.45);}
.tag--hot{color:var(--yellow);border-color:rgba(255,216,77,.45);}

/* ---------- 14. 表格 ---------- */
.data-table{
  width:100%;
  font-size:14px;
}
.data-table th{
  padding:10px 12px;
  text-align:left;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--cyan);
  border-bottom:1px solid var(--cyan);
  white-space:nowrap;
}
.data-table td{
  padding:12px;
  border-bottom:1px solid var(--line);
  color:var(--text);
  vertical-align:top;
}
.data-table tbody tr{transition:background-color .18s ease;}
.data-table tbody tr:hover td{background:rgba(177,75,255,.08);}

/* ---------- 15. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  border:1px solid var(--line);
  background:
    radial-gradient(120% 90% at 22% 8%,rgba(177,75,255,.32),transparent 62%),
    linear-gradient(160deg,var(--band-indigo),var(--band-deep) 58%,#06050D);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:repeating-linear-gradient(to bottom,rgba(232,236,245,.07) 0 1px,transparent 1px 4px);
}
.media-frame > img,
.media-frame > picture,
.media-frame > .media-frame__img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame__label{
  position:absolute;
  left:12px;
  bottom:10px;
  z-index:2;
  padding:2px 8px;
  border:1px solid rgba(255,216,77,.45);
  background:rgba(7,6,15,.76);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--yellow);
}
.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;}

/* ---------- 16. 响应式 ---------- */
@media (max-width:1100px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:30px;}
  .footer-col--contact{grid-column:1 / -1;}
}

@media (max-width:900px){
  :root{--gutter:18px;}

  .header-frame{flex-wrap:wrap;gap:12px;padding:10px var(--gutter);}
  .version-rail{order:3;flex:1 0 100%;}
  .version-rail__list{gap:10px;}
  .nav-toggle{display:inline-flex;}

  .nav-bar{border-top:1px solid var(--line);}
  .primary-nav{
    display:none;
    padding:0 var(--gutter);
    max-height:72vh;
    overflow-y:auto;
  }
  .primary-nav[data-open="true"]{display:block;}
  .primary-nav__list{
    flex-direction:column;
    flex-wrap:nowrap;
    counter-reset:navitem;
    padding:6px 0 14px;
  }
  .primary-nav__list > li{
    counter-increment:navitem;
    border-left:0;
  }
  .primary-nav__list > li + li{border-left:0;border-top:1px solid var(--line-soft);}
  .primary-nav__list > li:first-child > .primary-nav__link{padding-left:34px;}
  .primary-nav__link{padding:14px 0 14px 34px;font-size:14.5px;}
  .primary-nav__link::before{
    content:counter(navitem,decimal-leading-zero);
    position:absolute;
    left:0;
    font-family:var(--font-mono);
    font-size:11px;
    letter-spacing:.12em;
    color:var(--violet);
  }
  .primary-nav__link::after{left:0;right:0;}

  .grid-12{grid-template-columns:repeat(4,minmax(0,1fr));}
  .col-span-4,.col-span-5,.col-span-7,.col-span-8,.col-span-12{grid-column:1 / -1;}
  .note-rail{border-left:0;border-top:1px solid var(--line);padding-left:0;padding-top:14px;}
}

@media (max-width:640px){
  body{font-size:15.5px;line-height:1.8;}

  .search-capsule{padding:0;width:34px;justify-content:center;}
  .search-capsule__text{display:none;}
  .version-badge{display:none;}
  .brand-name{font-size:18px;}
  .brand-scale{height:22px;}

  .footer-brand__name{font-size:22px;}
  .footer-grid{grid-template-columns:1fr;gap:26px;padding:28px 0 24px;}
  .footer-meta{font-size:11.5px;}
  .footer-meta__copy{margin-left:0;}
  .footer-contact__row{grid-template-columns:52px minmax(0,1fr);}

  .to-top{right:14px;bottom:14px;width:48px;height:48px;}
}

/* ---------- 17. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  body::before{display:none;}
}