/* ==========================================================================
   365升级站 · 共享站点样式 /assets/site.css
   墨黑蓝图底 · 侧边轨道导航 · 奶油实色内容层 · 仪表盘式状态色
   ========================================================================== */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:96px;background:#0B0D0F}
body{margin:0;min-height:100vh;padding-left:0}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video,canvas{display:block;max-width:100%}
img{height:auto}
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%}
hr{border:0;border-top:1px solid #1F262D;margin:0}

/* ---------- 2. 设计变量 ---------- */
:root{
  --ink:#0B0D0F;
  --panel:#12161A;
  --line:#1F262D;
  --cream:#F3EBDD;
  --silver:#C9D2DA;
  --mid:#8B97A3;
  --cyan:#1FE0CF;
  --orange:#FF6A2B;
  --green:#38D07C;
  --red:#FF4D6D;

  --rail-w:220px;
  --topbar-h:58px;
  --gutter:24px;
  --grid-unit:24px;
  --pad-x:clamp(20px,3.6vw,64px);
  --radius:3px;

  --sans:"PingFang SC","Noto Sans SC","Source Han Sans SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --ease:cubic-bezier(.2,.7,.3,1);
  --shadow:0 20px 44px -30px rgba(0,0,0,.95);
}

/* ---------- 3. 基础排版 ---------- */
body{
  background-color:var(--ink);
  background-image:
    linear-gradient(to right,rgba(31,38,45,.62) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(31,38,45,.62) 1px,transparent 1px);
  background-size:var(--grid-unit) var(--grid-unit);
  color:var(--silver);
  font-family:var(--sans);
  font-size:17px;
  font-weight:400;
  line-height:1.7;
  letter-spacing:0;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background:
    radial-gradient(58% 42% at 84% -6%,rgba(31,224,207,.10),transparent 70%),
    radial-gradient(46% 38% at 4% 106%,rgba(255,106,43,.07),transparent 70%);
}
h1,h2,h3,h4{color:var(--cream);font-weight:800;letter-spacing:-.01em;line-height:1.15}
h1{font-size:clamp(2.6rem,6vw,5.2rem);font-weight:900;letter-spacing:-.02em;line-height:1.04}
h2{font-size:clamp(1.6rem,2.6vw,2.2rem)}
h3{font-size:1.15rem}
h4{font-size:1rem}
strong,b{font-weight:800;color:var(--cream)}
::selection{background:var(--cyan);color:#08110F}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}
a:focus-visible,button:focus-visible{outline-offset:3px}

/* ---------- 4. 工具类 ---------- */
.mono{
  font-family:var(--mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.04em;
}
.tag,.chip,.eyebrow,.nav-index,.row-index,.row-meta{font-family:var(--mono);letter-spacing:.06em}
.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}
.skip-link{
  position:absolute;
  left:16px;
  top:-72px;
  z-index:120;
  display:inline-flex;
  align-items:center;
  padding:10px 18px;
  background:var(--cyan);
  color:#06110F;
  font-weight:800;
  font-size:.88rem;
  border-radius:2px;
  transition:top .16s var(--ease);
}
.skip-link:focus{top:12px}
.stack{display:flex;flex-direction:column;gap:var(--gutter)}

/* ---------- 5. 内容骨架 ---------- */
#main-content{
  position:relative;
  z-index:1;
  display:block;
  padding:clamp(76px,9vh,124px) var(--pad-x) clamp(72px,9vh,112px);
  max-width:1520px;
}
.content-wrap{max-width:1120px}
.content-wrap--wide{max-width:1320px}
.section{padding:clamp(30px,4.6vh,60px) 0}
.section + .section{margin-top:clamp(6px,1.6vh,20px)}
.section--ruled{border-top:1px solid var(--line)}
.section-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 18px;margin-bottom:clamp(16px,2.4vh,28px)}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-size:.7rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{content:"";width:20px;height:1px;background:var(--cyan)}
.lede{
  max-width:64ch;
  font-size:clamp(1.05rem,1.35vw,1.28rem);
  line-height:1.65;
  font-weight:300;
  color:var(--silver);
}

/* ---------- 6. 栅格 ---------- */
.mosaic{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gutter)}
.c-3{grid-column:span 3}
.c-4{grid-column:span 4}
.c-5{grid-column:span 5}
.c-6{grid-column:span 6}
.c-7{grid-column:span 7}
.c-8{grid-column:span 8}
.c-9{grid-column:span 9}
.c-12{grid-column:span 12}
.split{display:grid;gap:clamp(20px,3vw,44px);grid-template-columns:minmax(0,1.7fr) minmax(0,1fr);align-items:start}
.split--reverse{grid-template-columns:minmax(0,1fr) minmax(0,1.7fr)}
.card-grid{display:grid;gap:var(--gutter);grid-template-columns:repeat(auto-fill,minmax(232px,1fr))}
.media-grid{display:grid;gap:var(--gutter);grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}

/* ---------- 7. 面板与卡片 ---------- */
.panel{
  position:relative;
  padding:clamp(16px,2vw,26px);
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.panel--glass{
  background:rgba(18,22,26,.62);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  border-color:rgba(201,210,218,.14);
}
.panel--cream{
  background:var(--cream);
  border-color:rgba(11,13,15,.16);
  color:#20262B;
}
.panel--cream h2,.panel--cream h3,.panel--cream h4,.panel--cream .panel-title,.panel--cream .card-title{color:#0B0D0F}
.panel--cream p,.panel--cream li,.panel--cream dd{color:#3B444C}
.panel--cream .mono,.panel--cream .row-meta,.panel--cream .row-index{color:#6B7580}
.panel--cream .chip{background:rgba(11,13,15,.05);border-color:rgba(11,13,15,.16);color:#4A545D}
.panel--cream a:not(.btn){color:#0E6F66;border-bottom:1px solid rgba(14,111,102,.4)}
.panel-title,.card-title{
  display:block;
  font-size:1.02rem;
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--cream);
  line-height:1.3;
}
.card-title{margin-bottom:8px}

/* ---------- 8. 标签、按钮 ---------- */
.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  border:1px solid var(--line);
  border-radius:2px;
  background:rgba(18,22,26,.75);
  color:var(--mid);
  font-size:.68rem;
  line-height:1.3;
}
.chip--cyan{color:var(--cyan);border-color:rgba(31,224,207,.42);background:rgba(31,224,207,.07)}
.chip--orange{color:var(--orange);border-color:rgba(255,106,43,.42);background:rgba(255,106,43,.07)}
.chip--green{color:var(--green);border-color:rgba(56,208,124,.42);background:rgba(56,208,124,.07)}
.chip--red{color:var(--red);border-color:rgba(255,77,109,.42);background:rgba(255,77,109,.07)}
.tag{
  display:inline-block;
  padding:2px 7px;
  border-left:2px solid var(--cyan);
  background:rgba(31,224,207,.08);
  color:var(--cyan);
  font-size:.66rem;
  line-height:1.6;
}
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:12px 20px;
  border:1px solid var(--line);
  border-radius:2px;
  background:var(--panel);
  color:var(--cream);
  font-size:.9rem;
  font-weight:800;
  line-height:1.2;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{transform:translateY(-1px);border-color:var(--cyan);color:var(--cyan)}
.btn--primary{background:var(--orange);border-color:var(--orange);color:#0B0D0F}
.btn--primary:hover{background:#FF7F4C;border-color:#FF7F4C;color:#0B0D0F}
.btn--ghost{background:transparent;color:var(--silver)}
.btn--small{padding:8px 14px;font-size:.8rem}

/* ---------- 9. 状态灯 ---------- */
.status-dot{
  flex:0 0 auto;
  width:8px;height:8px;
  border-radius:50%;
  background:var(--mid);
  box-shadow:0 0 0 3px rgba(139,151,163,.14);
}
.status-dot--live{background:var(--green);box-shadow:0 0 0 3px rgba(56,208,124,.16);animation:breathe 2.4s ease-in-out infinite}
.status-dot--warn{background:var(--orange);box-shadow:0 0 0 3px rgba(255,106,43,.16)}
.status-dot--alert{background:var(--red);box-shadow:0 0 0 3px rgba(255,77,109,.16)}
@keyframes breathe{0%,100%{opacity:.55}50%{opacity:1}}

/* ---------- 10. 高密度索引列表 ---------- */
.row-list{display:flex;flex-direction:column;border-top:1px solid var(--line)}
.row{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:baseline;
  gap:6px 16px;
  padding:14px 4px;
  border-bottom:1px solid var(--line);
  transition:background-color .16s var(--ease),border-color .16s var(--ease);
}
a.row:hover{background:rgba(31,224,207,.05);border-bottom-color:rgba(31,224,207,.35)}
.row-index{font-size:.72rem;color:var(--mid)}
.row-title{font-weight:800;color:var(--cream)}
.row-meta{font-size:.7rem;color:var(--mid);white-space:nowrap}

/* ---------- 11. 面包屑与长文 ---------- */
.breadcrumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:clamp(20px,3vh,34px);font-family:var(--mono);font-size:.7rem;letter-spacing:.06em;color:var(--mid)}
.breadcrumbs li{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs li + li::before{content:"/";color:#3A444D}
.breadcrumbs a{color:var(--mid);border-bottom:1px dotted rgba(139,151,163,.5)}
.breadcrumbs a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.breadcrumbs [aria-current="page"]{color:var(--silver)}
.prose{max-width:72ch;color:var(--silver)}
.prose > * + *{margin-top:1em}
.prose h2{font-size:clamp(1.4rem,2.2vw,1.85rem);margin-top:1.8em}
.prose h3{font-size:1.12rem;margin-top:1.6em}
.prose ul,.prose ol{list-style:revert;padding-left:1.25em}
.prose li{margin-bottom:.45em}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(31,224,207,.42)}
.prose a:hover{border-bottom-color:var(--cyan)}
.prose code{font-family:var(--mono);font-size:.88em;color:var(--orange);background:rgba(255,106,43,.09);padding:1px 5px;border-radius:2px}
.prose blockquote{border-left:2px solid var(--cyan);padding-left:16px;color:var(--mid)}

/* ---------- 12. 图像容器 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(135deg,#161B21,#0E1216);
}
.media-frame img,.media-frame svg{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(201,210,218,.07) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(201,210,218,.07) 1px,transparent 1px);
  background-size:var(--grid-unit) var(--grid-unit);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-cap{margin-top:10px;font-family:var(--mono);font-size:.68rem;letter-spacing:.06em;color:var(--mid)}

/* ---------- 13. 页内锚点目录 ---------- */
.spy{position:sticky;top:96px}
.spy-title{font-family:var(--mono);font-size:.68rem;letter-spacing:.14em;color:var(--mid);text-transform:uppercase;margin-bottom:12px}
.spy-list{display:flex;flex-direction:column;border-left:1px solid var(--line)}
.spy-link{
  display:block;
  padding:7px 0 7px 14px;
  margin-left:-1px;
  border-left:2px solid transparent;
  font-size:.86rem;
  color:var(--mid);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.spy-link:hover{color:var(--silver)}
.spy-link.is-active{color:var(--cyan);border-left-color:var(--cyan)}

/* ---------- 14. 复制按钮 ---------- */
.copy-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.copy-value{font-family:var(--mono);font-size:.8rem;letter-spacing:.02em;color:var(--cream);word-break:break-all}
.copy-btn{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 11px;
  border:1px solid var(--line);
  border-radius:2px;
  background:var(--panel);
  color:var(--mid);
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.08em;
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease);
}
.copy-btn:hover{color:var(--cyan);border-color:rgba(31,224,207,.45)}
.copy-btn[data-copied]{color:var(--green);border-color:rgba(56,208,124,.5);background:rgba(56,208,124,.08)}

/* ---------- 15. 头部：侧边轨道 / 移动顶栏 ---------- */
.site-rail{
  position:fixed;
  top:0;left:0;bottom:0;
  z-index:60;
  width:var(--rail-w);
  background:rgba(18,22,26,.97);
  border-right:1px solid var(--line);
}
.rail-inner{
  display:flex;
  flex-direction:column;
  gap:16px;
  width:100%;
  height:100%;
  padding:22px 16px 18px;
  overflow-y:auto;
  overflow-x:visible;
}
.rail-brand{display:block}
.brand-mark{display:flex;align-items:center;gap:10px;color:var(--cream)}
.brand-glyph{
  flex:0 0 auto;
  padding:3px 6px;
  border:1px solid rgba(31,224,207,.45);
  border-radius:2px;
  background:rgba(31,224,207,.08);
  color:var(--cyan);
  font-family:var(--mono);
  font-size:.68rem;
  letter-spacing:.08em;
}
.brand-name{display:block;font-size:1.04rem;font-weight:800;letter-spacing:-.01em;line-height:1.2;color:var(--cream)}
.brand-sub{display:block;margin-top:3px;font-family:var(--mono);font-size:.62rem;letter-spacing:.04em;color:var(--mid);line-height:1.35}
.rail-status{
  display:flex;
  align-items:center;
  gap:8px;
  padding:7px 9px;
  border:1px dashed var(--line);
  border-radius:2px;
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.06em;
  color:var(--mid);
}
.rail-status-text{white-space:nowrap}
.nav-toggle{display:none}
.site-nav{display:block}
.nav-list{display:flex;flex-direction:column;gap:2px;padding-top:12px;border-top:1px solid var(--line)}
.nav-item{display:block}
.nav-link{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding:9px 10px 9px 13px;
  border-left:2px solid transparent;
  color:var(--silver);
  font-size:.92rem;
  font-weight:500;
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.nav-link:hover{color:var(--cream);background:rgba(31,224,207,.05);border-left-color:rgba(31,224,207,.4)}
.nav-link[aria-current="page"]{
  color:var(--cyan);
  background:rgba(31,224,207,.09);
  border-left-color:var(--cyan);
  font-weight:800;
}
.nav-index{font-size:.64rem;color:var(--mid)}
.nav-link[aria-current="page"] .nav-index{color:var(--cyan)}
.rail-foot{
  display:flex;
  flex-direction:column;
  gap:8px;
  margin-top:auto;
  padding-top:16px;
  border-top:1px solid var(--line);
}
.rail-cta{
  display:flex;
  align-items:center;
  justify-content:center;
  padding:11px 14px;
  border:1px solid var(--orange);
  border-radius:2px;
  background:var(--orange);
  color:#0B0D0F;
  font-size:.88rem;
  font-weight:800;
  transition:background-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
}
.rail-cta:hover{background:#FF7F4C;border-color:#FF7F4C;transform:translateY(-1px)}
.rail-note{font-family:var(--mono);font-size:.62rem;letter-spacing:.06em;color:var(--mid);text-align:center}
.progress-track{
  position:fixed;
  top:0;
  left:var(--rail-w);
  right:0;
  z-index:70;
  height:2px;
  background:rgba(31,38,45,.75);
  pointer-events:none;
}
.progress-bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transition:width .18s var(--ease);
}

/* ---------- 16. 页脚 ---------- */
.site-foot{
  position:relative;
  z-index:1;
  padding:clamp(34px,5vw,68px) var(--pad-x) 24px;
  background:rgba(18,22,26,.96);
  border-top:1px solid var(--line);
}
.foot-grid{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) minmax(0,1fr) minmax(0,1fr) minmax(0,1.4fr);
  gap:clamp(24px,3.4vw,52px);
  max-width:1520px;
}
.foot-brand{display:flex;flex-direction:column;align-items:flex-start}
.foot-summary{margin-top:16px;max-width:36ch;font-size:.9rem;line-height:1.65;color:var(--mid)}
.foot-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.foot-col{display:block;min-width:0}
.foot-col-title{margin-bottom:14px;font-family:var(--mono);font-size:.68rem;font-weight:500;letter-spacing:.14em;text-transform:uppercase;color:var(--mid)}
.foot-links{display:flex;flex-direction:column;gap:9px}
.foot-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:.92rem;
  color:var(--silver);
  transition:color .18s var(--ease);
}
.foot-link::before{content:"›";font-family:var(--mono);color:#39434C;transition:color .18s var(--ease)}
.foot-link:hover,.foot-link:hover::before{color:var(--cyan)}
.foot-link[aria-current="page"]{color:var(--cyan)}
.foot-contact{display:flex;flex-direction:column;gap:10px}
.foot-contact-line{display:flex;flex-wrap:wrap;gap:4px 10px;font-size:.88rem;color:var(--silver)}
.foot-key{flex:0 0 38px;padding-top:2px;font-family:var(--mono);font-size:.64rem;letter-spacing:.1em;color:var(--mid)}
.foot-note{font-size:.76rem;color:var(--mid)}
.foot-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 24px;
  max-width:1520px;
  margin-top:clamp(28px,4.4vw,56px);
  padding-top:18px;
  border-top:1px solid var(--line);
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.06em;
  color:var(--mid);
}
.foot-legal-line{white-space:nowrap}

/* ---------- 17. 显现动效 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
[data-reveal].is-in{opacity:1;transform:none}
[data-reveal-delay="1"]{transition-delay:60ms}
[data-reveal-delay="2"]{transition-delay:120ms}
[data-reveal-delay="3"]{transition-delay:180ms}
[data-reveal-delay="4"]{transition-delay:240ms}

/* ---------- 18. 平板 ---------- */
@media (max-width:1023px){
  body{padding-left:0}
  #main-content{padding:calc(var(--topbar-h) + 34px) var(--pad-x) 76px}
  .progress-track{left:0}
  .site-rail{
    bottom:auto;
    width:100%;
    height:var(--topbar-h);
    border-right:0;
    border-bottom:1px solid var(--line);
    background:rgba(18,22,26,.98);
  }
  .rail-inner{
    flex-direction:row;
    align-items:center;
    gap:10px;
    height:var(--topbar-h);
    padding:0 16px;
    overflow:visible;
  }
  .rail-brand{margin-right:auto}
  .brand-glyph{font-size:.62rem;padding:2px 5px}
  .brand-name{font-size:.94rem}
  .brand-sub{display:none}
  .rail-status{padding:5px 8px;font-size:.6rem}
  .nav-toggle{
    display:inline-flex;
    align-items:center;
    gap:8px;
    padding:8px 10px;
    border:1px solid var(--line);
    border-radius:2px;
    color:var(--silver);
    font-family:var(--mono);
    font-size:.64rem;
    letter-spacing:.1em;
    transition:color .16s var(--ease),border-color .16s var(--ease);
  }
  .nav-toggle-bars{display:flex;flex-direction:column;gap:3px;width:16px}
  .nav-toggle-bars span{display:block;height:1.5px;background:currentColor;transition:transform .16s var(--ease),opacity .16s var(--ease)}
  .nav-toggle-label{line-height:1}
  .site-rail[data-open] .nav-toggle{color:var(--cyan);border-color:rgba(31,224,207,.5)}
  .site-rail[data-open] .nav-toggle-bars span:nth-child(1){transform:translateY(4.5px) rotate(45deg)}
  .site-rail[data-open] .nav-toggle-bars span:nth-child(2){opacity:0}
  .site-rail[data-open] .nav-toggle-bars span:nth-child(3){transform:translateY(-4.5px) rotate(-45deg)}
  .site-nav{
    position:fixed;
    top:var(--topbar-h);
    left:0;
    right:0;
    max-height:calc(100vh - var(--topbar-h));
    padding:14px 16px 18px;
    overflow-y:auto;
    background:rgba(18,22,26,.99);
    border-bottom:1px solid var(--line);
    transform:translateY(-10px);
    opacity:0;
    visibility:hidden;
    transition:transform .18s var(--ease),opacity .18s var(--ease),visibility .18s var(--ease);
  }
  .nav-list{padding-top:0;border-top:0;gap:4px}
  .nav-link{padding:13px 12px;font-size:1rem}
  .rail-foot{
    position:fixed;
    left:0;
    right:0;
    bottom:0;
    margin:0;
    padding:14px 16px;
    gap:6px;
    background:rgba(18,22,26,.99);
    border-top:1px solid var(--line);
    transform:translateY(14px);
    opacity:0;
    visibility:hidden;
    transition:transform .18s var(--ease),opacity .18s var(--ease),visibility .18s var(--ease);
  }
  .site-rail[data-open] .site-nav,
  .site-rail[data-open] .rail-foot{transform:none;opacity:1;visibility:visible}
  html.nav-open,html.nav-open body{overflow:hidden}
  .mosaic > .c-3,.mosaic > .c-4,.mosaic > .c-5{grid-column:span 6}
  .mosaic > .c-7,.mosaic > .c-8,.mosaic > .c-9{grid-column:span 12}
  .foot-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot-brand{grid-column:1 / -1}
  .spy{position:static}
  .split,.split--reverse{grid-template-columns:minmax(0,1fr)}
}

/* ---------- 19. 手机 ---------- */
@media (max-width:640px){
  body{font-size:16px}
  :root{--gutter:16px;--grid-unit:24px}
  .mosaic > *{grid-column:span 12}
  .card-grid,.media-grid{grid-template-columns:minmax(0,1fr)}
  .foot-grid{grid-template-columns:minmax(0,1fr)}
  .row{grid-template-columns:auto minmax(0,1fr);row-gap:4px}
  .row-meta{grid-column:2;white-space:normal}
  .foot-legal{flex-direction:column;align-items:flex-start}
}
@media (max-width:400px){
  .rail-status{display:none}
}

/* ---------- 20. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  [data-reveal]{opacity:1;transform:none}
  .status-dot--live{animation:none;opacity:1}
  .progress-bar{transition:none}
}