/* ============================================================
   竞博网页 · 共享样式 /assets/site.css
   蓝图网格 + 命令栏 + 仪表板页脚
   ============================================================ */

/* ---------- 1. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:7rem}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
h1,h2,h3,h4{font-weight:700;line-height:1.18;letter-spacing:-.02em}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg,video{display:block;max-width:100%}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--amber);outline-offset:3px;border-radius:4px}
::selection{background:var(--red);color:#fff}

/* ---------- 2. 变量 ---------- */
:root{
  --ink:#0A1A2A;
  --ink-2:#12293D;
  --slate:#2B3339;
  --paper:#F5F7F8;
  --mist:#9DB0BF;
  --red:#D7263D;
  --red-soft:#E8344B;
  --amber:#E3A93F;
  --moss:#5F7A5C;
  --clay:#B86B4B;
  --glass:#EAF0F4;

  --line:rgba(157,176,191,.20);
  --line-strong:rgba(157,176,191,.42);
  --line-red:rgba(215,38,61,.55);

  --shell:1240px;
  --gutter:clamp(1.1rem,4vw,3rem);

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

  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:260ms;
  --radius:10px;
  --radius-sm:8px;
}

/* ---------- 3. 基底与蓝图背景 ---------- */
body{
  background-color:var(--ink);
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:1rem;
  font-weight:400;
  line-height:1.8;
  min-height:100dvh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(157,176,191,.055) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(157,176,191,.055) 1px,transparent 1px);
  background-size:72px 72px;
  -webkit-mask-image:radial-gradient(120% 90% at 50% 0%,#000 18%,rgba(0,0,0,.35) 62%,transparent 100%);
  mask-image:radial-gradient(120% 90% at 50% 0%,#000 18%,rgba(0,0,0,.35) 62%,transparent 100%);
}
body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background:
    radial-gradient(60% 42% at 10% 0%,rgba(215,38,61,.16),transparent 70%),
    radial-gradient(52% 40% at 92% 4%,rgba(227,169,63,.10),transparent 72%),
    radial-gradient(80% 55% at 50% 104%,rgba(18,41,61,.92),transparent 72%);
}
main,.page-main{position:relative;z-index:1;display:block}

/* ---------- 4. 排版工具 ---------- */
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.thin{font-weight:300}
.heavy{font-weight:900}
.sr-only{
  position:absolute!important;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;border:0;
}
.headline{
  font-size:clamp(1.55rem,3vw,2.45rem);
  font-weight:700;
  letter-spacing:-.025em;
  line-height:1.2;
}
.lede{
  font-size:clamp(1rem,1.1vw,1.1rem);
  line-height:1.85;
  color:var(--mist);
  max-width:64ch;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--mist);
  text-transform:uppercase;
}
.eyebrow::before{
  content:"";
  width:26px;height:1px;
  background:var(--red);
  flex:0 0 auto;
}
.index-num{
  font-family:var(--font-mono);
  font-weight:300;
  font-size:clamp(1.6rem,3.4vw,2.5rem);
  line-height:1;
  letter-spacing:.01em;
  color:rgba(157,176,191,.55);
}
.rule{height:1px;border:0;background:var(--line);margin:0}

/* ---------- 5. 骨架 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{
  position:relative;
  padding-block:clamp(3rem,7vw,6rem);
}
.section__head{
  display:grid;
  gap:.75rem;
  margin-bottom:clamp(1.5rem,3vw,2.5rem);
}
.grid{
  display:grid;
  gap:clamp(1rem,2vw,1.75rem);
}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--aside{grid-template-columns:minmax(0,3fr) minmax(0,9fr)}

/* ---------- 6. 跳过链接 ---------- */
.skip-link{
  position:fixed;
  top:.6rem;left:.6rem;
  z-index:200;
  padding:.7rem 1.1rem;
  border-radius:var(--radius-sm);
  background:var(--paper);
  color:var(--ink);
  font-size:.88rem;
  font-weight:700;
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 7. 按钮 ---------- */
.btn{
  --btn-bg:transparent;
  --btn-fg:var(--paper);
  --btn-bd:var(--line-strong);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  min-height:44px;
  padding:.6rem 1.1rem;
  border:1px solid var(--btn-bd);
  border-radius:var(--radius-sm);
  background:var(--btn-bg);
  color:var(--btn-fg);
  font-size:.9rem;
  font-weight:600;
  letter-spacing:.02em;
  line-height:1.2;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--sm{min-height:40px;padding:.45rem .85rem;font-size:.84rem}
.btn--accent{--btn-bg:var(--red);--btn-fg:#fff;--btn-bd:var(--red)}
.btn--accent:hover{--btn-bg:var(--red-soft);--btn-bd:var(--red-soft)}
.btn--solid{--btn-bg:var(--paper);--btn-fg:var(--ink);--btn-bd:var(--paper)}
.btn--solid:hover{--btn-bg:#fff;--btn-bd:#fff}
.btn--ghost{--btn-bg:transparent;--btn-fg:var(--paper);--btn-bd:var(--line-strong)}
.btn--ghost:hover{--btn-bg:rgba(234,240,244,.08);--btn-bd:var(--amber);--btn-fg:#fff}
.btn--amber{--btn-bg:var(--amber);--btn-fg:#25190a;--btn-bd:var(--amber)}
.btn--amber:hover{--btn-bg:#f0b855;--btn-bd:#f0b855}

/* ---------- 8. 面板 / 标签 / 面包屑 ---------- */
.panel{
  position:relative;
  padding:clamp(1.1rem,2.4vw,1.8rem);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--ink-2);
}
.panel--glass{
  background:linear-gradient(160deg,rgba(234,240,244,.11),rgba(234,240,244,.03));
  border-color:rgba(234,240,244,.18);
  -webkit-backdrop-filter:blur(10px) saturate(1.15);
  backdrop-filter:blur(10px) saturate(1.15);
}
.panel--mark::after{
  content:"";
  position:absolute;
  top:10px;right:10px;
  width:12px;height:12px;
  background:
    linear-gradient(var(--line-strong),var(--line-strong)) center/12px 1px no-repeat,
    linear-gradient(var(--line-strong),var(--line-strong)) center/1px 12px no-repeat;
  opacity:.9;
  pointer-events:none;
}
.tag{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.28rem .6rem;
  border:1px solid var(--line-strong);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--mist);
  line-height:1.4;
}
.tag--moss{color:#d3e2d0;border-color:rgba(95,122,92,.75);background:rgba(95,122,92,.18)}
.tag--amber{color:#f6dfae;border-color:rgba(227,169,63,.7);background:rgba(227,169,63,.14)}
.tag--clay{color:#f0cdbd;border-color:rgba(184,107,75,.7);background:rgba(184,107,75,.16)}
.tag--red{color:#ffd7dc;border-color:var(--line-red);background:rgba(215,38,61,.18)}

.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--mist);
}
.crumbs__link{
  color:var(--mist);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.crumbs__link:hover{color:var(--paper);border-bottom-color:var(--line-strong)}
.crumbs__sep{color:rgba(157,176,191,.45)}
.crumbs [aria-current="page"]{color:var(--paper)}

/* ---------- 9. 图片容器（抽象视觉占位） ---------- */
.media{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:
    linear-gradient(135deg,#0d2133 0%,#12293D 46%,#16303f 72%,#0c1e2e 100%);
  isolation:isolate;
}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--21x9{aspect-ratio:21/9}
.media__frame{
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(to right,rgba(157,176,191,.16) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(157,176,191,.16) 1px,transparent 1px);
  background-size:32px 32px;
  opacity:.75;
}
.media__frame::before{
  content:"";
  position:absolute;
  inset:-20% -10%;
  background:
    linear-gradient(105deg,transparent 38%,rgba(215,38,61,.30) 46%,rgba(234,240,244,.16) 50%,transparent 58%),
    radial-gradient(60% 70% at 78% 22%,rgba(227,169,63,.20),transparent 70%);
}
.media__frame::after{
  content:"";
  position:absolute;
  left:12px;bottom:12px;
  width:34px;height:34px;
  border-left:1px solid var(--line-strong);
  border-bottom:1px solid var(--line-strong);
}
.media__caption{
  margin-top:.6rem;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--mist);
}

/* ---------- 10. 分段标签页 ---------- */
.tabs{position:relative}
.tabs__list{
  display:flex;
  gap:.25rem;
  border-bottom:1px solid var(--line);
  overflow-x:auto;
  scrollbar-width:thin;
  -webkit-overflow-scrolling:touch;
}
.tabs__btn{
  position:relative;
  min-height:44px;
  padding:.6rem .9rem;
  border-bottom:2px solid transparent;
  color:var(--mist);
  font-size:.9rem;
  font-weight:600;
  white-space:nowrap;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.tabs__btn:hover{color:var(--paper)}
.tabs__btn[aria-selected="true"]{color:var(--paper);border-bottom-color:var(--red)}
.tabs__panel{padding-top:1.25rem;animation:panelIn .26s var(--ease) both}
.tabs__panel[hidden]{display:none}
@keyframes panelIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ---------- 11. 进入动效 ---------- */
.js .reveal{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .3s var(--ease),transform .3s var(--ease);
}
.js .reveal.is-in{opacity:1;transform:none}

/* ---------- 12. 头部命令栏 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(10,26,42,.90);
  border-bottom:1px solid var(--line-strong);
  -webkit-backdrop-filter:blur(16px) saturate(1.2);
  backdrop-filter:blur(16px) saturate(1.2);
}
.site-header__rail{
  border-bottom:1px solid var(--line);
  background:rgba(18,41,61,.55);
}
.rail{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  padding-block:.36rem;
  min-height:26px;
}
.rail__coord{
  font-size:10px;
  letter-spacing:.16em;
  color:rgba(157,176,191,.82);
  white-space:nowrap;
}
.rail__coord--mid{
  color:rgba(157,176,191,.55);
  letter-spacing:.22em;
}
.rail__coord--end{
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  color:rgba(157,176,191,.82);
}
.dot{
  width:7px;height:7px;
  border-radius:50%;
  background:var(--mist);
  flex:0 0 auto;
}
.dot--moss{
  background:var(--moss);
  box-shadow:0 0 0 3px rgba(95,122,92,.22);
  animation:pulse 3.2s var(--ease) infinite;
}
@keyframes pulse{
  0%,100%{box-shadow:0 0 0 3px rgba(95,122,92,.22)}
  50%{box-shadow:0 0 0 6px rgba(95,122,92,.06)}
}

.site-header__bar{
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:clamp(.75rem,2vw,1.5rem);
  padding-block:.7rem;
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:.7rem;
  min-height:44px;
  color:var(--paper);
}
.brand__mark{
  position:relative;
  flex:0 0 auto;
  width:34px;height:34px;
  border:1px solid rgba(157,176,191,.45);
  border-radius:var(--radius-sm);
  background:linear-gradient(150deg,rgba(234,240,244,.10),rgba(234,240,244,0));
  transition:border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.brand:hover .brand__mark{border-color:var(--red);transform:rotate(45deg)}
.brand__mark-line{position:absolute;background:rgba(157,176,191,.5)}
.brand__mark-line--h{left:6px;right:6px;top:50%;height:1px;transform:translateY(-.5px)}
.brand__mark-line--v{top:6px;bottom:6px;left:50%;width:1px;transform:translateX(-.5px)}
.brand__mark-core{
  position:absolute;
  left:50%;top:50%;
  width:8px;height:8px;
  margin:-4px 0 0 -4px;
  border-radius:2px;
  background:var(--red);
  box-shadow:0 0 0 3px rgba(215,38,61,.18);
}
.brand__text{display:grid;gap:.12rem;line-height:1.1}
.brand__label{font-size:1.02rem;font-weight:800;letter-spacing:.02em}
.brand__tagline{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.13em;
  color:var(--mist);
}

/* 主导航 */
.nav{justify-self:center}
.nav__list{
  display:flex;
  align-items:center;
  gap:.1rem;
}
.nav__link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:.38rem;
  min-height:44px;
  padding:.55rem .55rem;
  border-radius:var(--radius-sm);
  color:var(--mist);
  font-size:.88rem;
  font-weight:600;
  white-space:nowrap;
  transition:color .2s var(--ease),background .2s var(--ease);
}
.nav__link::after{
  content:"";
  position:absolute;
  left:.55rem;right:.55rem;bottom:2px;
  height:2px;
  background:var(--red);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav__link:hover{color:var(--paper);background:rgba(234,240,244,.06)}
.nav__link:hover::after{background:var(--line-strong);transform:scaleX(1)}
.nav__index{
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.06em;
  color:rgba(157,176,191,.6);
  transform:translateY(-1px);
  transition:color .2s var(--ease);
}
.nav__link:hover .nav__index{color:var(--amber)}
.nav__label{display:inline-block}
.nav__link[aria-current="page"]{color:var(--paper);background:rgba(234,240,244,.05)}
.nav__link[aria-current="page"]::after{background:var(--red);transform:scaleX(1)}
.nav__link[aria-current="page"] .nav__index{color:var(--red)}

/* 右侧工具 */
.site-header__tools{
  display:flex;
  align-items:center;
  gap:.6rem;
  justify-self:end;
}
.status{
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  color:var(--mist);
  white-space:nowrap;
}
.status__dot{
  width:6px;height:6px;
  border-radius:50%;
  background:var(--amber);
  box-shadow:0 0 0 3px rgba(227,169,63,.16);
  flex:0 0 auto;
}
.status__label{color:rgba(157,176,191,.9)}

/* 移动端开关 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  min-height:44px;
  min-width:44px;
  padding:.4rem .65rem;
  border:1px solid var(--line-strong);
  border-radius:var(--radius-sm);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--amber);background:rgba(234,240,244,.06)}
.nav-toggle__icon{
  position:relative;
  display:block;
  width:18px;height:12px;
}
.nav-toggle__icon span{
  position:absolute;
  left:0;right:0;
  height:2px;
  background:currentColor;
  transition:transform var(--dur) var(--ease),opacity .2s var(--ease);
}
.nav-toggle__icon span:nth-child(1){top:0}
.nav-toggle__icon span:nth-child(2){top:5px}
.nav-toggle__icon span:nth-child(3){top:10px}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* 滚动进度光带 */
.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  transform:scaleX(var(--p,0));
  transform-origin:left center;
  background:linear-gradient(90deg,var(--red) 0%,var(--red-soft) 45%,var(--amber) 100%);
  pointer-events:none;
}

/* ---------- 13. 页脚仪表板 ---------- */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:clamp(3rem,8vw,7rem);
  border-top:1px solid var(--line-strong);
  background:linear-gradient(180deg,rgba(18,41,61,0) 0%,#0b1d2e 34%,#081422 100%);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:9px;
  background-image:repeating-linear-gradient(90deg,var(--line-strong) 0 1px,transparent 1px 48px);
  opacity:.8;
  pointer-events:none;
}
.footer__grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.6fr;
  gap:clamp(1.6rem,4vw,3rem);
  padding-block:clamp(2.6rem,5vw,4.5rem) clamp(1.8rem,3vw,2.6rem);
}
.footer__brandline{
  font-size:1.05rem;
  font-weight:800;
  letter-spacing:.01em;
}
.footer__note{
  margin-top:.65rem;
  max-width:34ch;
  font-size:.9rem;
  line-height:1.8;
  color:var(--mist);
}
.footer__meta{
  margin-top:1.1rem;
  font-size:10.5px;
  letter-spacing:.18em;
  color:rgba(157,176,191,.7);
}
.footer__head{
  display:flex;
  align-items:center;
  gap:.5rem;
  margin-bottom:.9rem;
  padding-bottom:.65rem;
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.18em;
  color:var(--paper);
}
.footer__head::before{
  content:"";
  width:6px;height:6px;
  background:var(--red);
  border-radius:1px;
  flex:0 0 auto;
}
.footer__list{display:grid;gap:.35rem}
.footer__link{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  min-height:34px;
  font-size:.92rem;
  color:var(--mist);
  transition:color .2s var(--ease);
}
.footer__link::before{
  content:"";
  width:10px;height:1px;
  background:currentColor;
  opacity:.6;
  transition:width .2s var(--ease),background .2s var(--ease),opacity .2s var(--ease);
}
.footer__link:hover{color:var(--paper)}
.footer__link:hover::before{width:20px;background:var(--red);opacity:1}

.footer__list--contact{gap:0}
.footer__contact-item{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  align-items:center;
  gap:.1rem .6rem;
  padding-block:.5rem;
  border-bottom:1px dashed rgba(157,176,191,.16);
}
.footer__contact-label{
  grid-column:1;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.14em;
  color:rgba(157,176,191,.72);
}
.footer__contact-value{
  grid-column:1;
  font-size:.88rem;
  line-height:1.6;
  color:var(--paper);
  word-break:break-word;
}
.footer__contact-value--address{
  font-size:.84rem;
  line-height:1.7;
  color:var(--mist);
}
.footer__contact-item--wide .footer__contact-value{grid-column:1 / -1}
.copy-btn{
  grid-column:2;
  grid-row:1 / span 2;
  align-self:center;
  min-height:34px;
  padding:.25rem .55rem;
  border:1px solid var(--line-strong);
  border-radius:6px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.12em;
  color:var(--mist);
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.copy-btn:hover{color:var(--paper);border-color:var(--amber)}
.copy-btn[data-copied]{
  color:#25190a;
  background:var(--amber);
  border-color:var(--amber);
}
.footer__hours{
  margin-top:1rem;
  font-size:10.5px;
  letter-spacing:.14em;
  color:rgba(157,176,191,.72);
}
.footer__base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.6rem 1.5rem;
  padding-block:1.25rem;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.12em;
  color:rgba(157,176,191,.78);
}
.footer__legal{color:rgba(157,176,191,.78)}
.footer__copyright{color:var(--mist)}
.footer__stamp{color:rgba(157,176,191,.55)}

/* ---------- 14. 响应式 ---------- */
@media (max-width:1180px){
  .status{display:none}
}
@media (max-width:1024px){
  .site-header__bar{grid-template-columns:1fr auto}
  .nav{
    position:absolute;
    top:100%;left:0;right:0;
    display:none;
    max-height:min(72dvh,540px);
    overflow-y:auto;
    padding:.4rem var(--gutter) 1.1rem;
    background:rgba(10,26,42,.98);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line-strong);
    box-shadow:0 28px 64px rgba(0,0,0,.5);
    -webkit-backdrop-filter:blur(18px);
    backdrop-filter:blur(18px);
  }
  .nav[data-open]{
    display:block;
    animation:navIn .24s var(--ease) both;
  }
  @keyframes navIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__item{border-bottom:1px solid var(--line)}
  .nav__list > .nav__item:last-child{border-bottom:0}
  .nav__link{
    justify-content:flex-start;
    width:100%;
    min-height:52px;
    padding:.9rem .2rem;
    border-radius:0;
    font-size:.95rem;
  }
  .nav__link::after{left:0;right:0;bottom:0}
  .nav__link:hover{background:transparent}
  .nav-toggle{display:inline-flex}
  .footer__grid{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  .grid--2,.grid--3,.grid--aside{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:640px){
  .rail__coord--mid{display:none}
  .brand__tagline{display:none}
  .brand__label{font-size:.98rem}
  .header__cta{padding:.45rem .7rem;font-size:.8rem}
  .footer__grid{grid-template-columns:minmax(0,1fr)}
  .footer__base{justify-content:flex-start;gap:.35rem 1rem}
  .media--21x9{aspect-ratio:16/9}
}
@media (max-width:420px){
  .nav-toggle__label{display:none}
  .header__cta{display:none}
}

/* ---------- 15. 可访问性偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  .js .reveal{opacity:1;transform:none}
  .dot--moss{animation:none}
}