/* ==========================================================
   必一体育 · 共享样式表 /assets/site.css
   深空指挥台基底 · 荧光青信号 · 赛况橙红十字 · 靛紫区间带
   ========================================================== */

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

/* ---------- 2. 变量 ---------- */
:root{
  --ink:#05070C;
  --panel:#0C1424;
  --glass:#16233A;
  --cyan:#00E9D4;
  --cyan-deep:#00A99B;
  --flare:#FF4B1F;
  --violet:#6B4DF6;
  --blue:#3A6BFF;
  --wine:#8E1F3F;
  --text:#F1F5FF;
  --muted:#93A2BD;

  --line:rgba(147,162,189,.16);
  --line-strong:rgba(147,162,189,.3);
  --glass-line:rgba(0,233,212,.24);
  --text-soft:rgba(241,245,255,.78);

  --font-display:"Helvetica Neue","Arial Narrow","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Roboto,sans-serif;
  --font-mono:"SFMono-Regular",Menlo,Consolas,"DejaVu Sans Mono","Courier New",monospace;

  --shell:1240px;
  --shell-wide:1480px;
  --header-h:88px;
  --header-h-compact:64px;
  --radius-sm:10px;
  --radius:14px;
  --radius-lg:22px;
  --ease:cubic-bezier(.22,.68,.18,1);
  --dur:.38s;
}

/* ---------- 3. 基础与中文排版 ---------- */
html{background-color:var(--ink)}
body{
  min-height:100vh;
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--text);
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(147,162,189,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(147,162,189,.05) 1px,transparent 1px),
    radial-gradient(1100px 600px at 84% -8%,rgba(107,77,246,.22),transparent 62%),
    radial-gradient(900px 520px at 4% 0%,rgba(0,169,155,.16),transparent 60%);
  background-size:100% 92px,92px 100%,auto,auto;
  background-repeat:repeat,repeat,no-repeat,no-repeat;
  background-position:0 0,0 0,0 0,0 0;
  background-attachment:scroll,scroll,fixed,fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
p,li,dd{line-height:1.75}
strong,b{font-weight:700}
::selection{background:rgba(0,233,212,.28);color:#fff}

h1,h2,h3,h4{font-family:var(--font-display);line-height:1.15}

.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  letter-spacing:.02em;
}
.text-muted{color:var(--muted)}
.divider{height:1px;background:linear-gradient(90deg,var(--line),transparent);border:0}

/* ---------- 4. 容器与网格 ---------- */
.shell{width:min(100% - 40px,var(--shell));margin-inline:auto}
.shell--wide{width:min(100% - 40px,var(--shell-wide));margin-inline:auto}

.page-main{display:block}
.page-main{padding-top:var(--header-h)}
.page-main--overlay{padding-top:0}

.split{
  display:grid;
  grid-template-columns:minmax(220px,.78fr) minmax(0,1.72fr);
  gap:clamp(24px,4vw,64px);
  align-items:start;
}
.rail-note{
  font-size:13px;
  line-height:1.7;
  color:var(--muted);
  border-left:2px solid rgba(0,233,212,.4);
  padding-left:14px;
}
.grid-cards{
  display:grid;
  gap:clamp(14px,1.8vw,22px);
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
}
.stack>*+*{margin-top:clamp(14px,1.8vw,24px)}

/* ---------- 5. 标题体系 ---------- */
.display-title{
  font-family:var(--font-display);
  font-weight:900;
  font-stretch:87.5%;
  font-size:clamp(34px,6.4vw,72px);
  line-height:1.02;
  letter-spacing:-.03em;
  text-wrap:balance;
}
.title-light{
  font-family:var(--font-display);
  font-weight:200;
  font-size:clamp(30px,5.4vw,64px);
  line-height:1.08;
  letter-spacing:-.02em;
  text-wrap:balance;
}
.section-title{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(22px,2.8vw,28px);
  line-height:1.25;
  letter-spacing:-.01em;
}
.section-label{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  color:var(--cyan);
}
.section-label::before{
  content:"";
  width:26px;height:1px;
  background:linear-gradient(90deg,var(--cyan),transparent);
}
.lede{
  font-size:clamp(15px,1.35vw,17px);
  line-height:1.8;
  color:var(--text-soft);
  max-width:36em;
}

/* ---------- 6. 按钮 ---------- */
.btn{
  --btn-bg:transparent;
  --btn-fg:var(--text);
  --btn-line:var(--line-strong);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 18px;
  border-radius:999px;
  border:1px solid var(--btn-line);
  background:var(--btn-bg);
  color:var(--btn-fg);
  font-size:14px;
  font-weight:600;
  line-height:1;
  letter-spacing:.02em;
  white-space:nowrap;
  transition:background-color .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease),transform .2s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--primary{--btn-bg:var(--cyan);--btn-fg:#03110F;--btn-line:var(--cyan);font-weight:700}
.btn--primary:hover{--btn-bg:#45f7e8;--btn-line:#45f7e8}
.btn--ghost{--btn-bg:rgba(22,35,58,.55);--btn-fg:var(--text);--btn-line:var(--line-strong)}
.btn--ghost:hover{--btn-bg:rgba(22,35,58,.92);--btn-line:var(--glass-line)}
.btn--flare{--btn-bg:var(--flare);--btn-fg:#fff;--btn-line:var(--flare);font-weight:700}
.btn--flare:hover{--btn-bg:#ff6a45;--btn-line:#ff6a45}
.btn--sm{padding:9px 14px;font-size:13px}
.btn--block{width:100%}

/* ---------- 7. 跳过链接 ---------- */
.skip-link{
  position:fixed;
  top:-70px;left:16px;
  z-index:200;
  padding:11px 18px;
  border-radius:var(--radius-sm);
  background:var(--cyan);
  color:#03110F;
  font-size:14px;
  font-weight:700;
  transition:top .28s var(--ease);
}
.skip-link:focus{top:14px}

/* ---------- 8. 页头 ---------- */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:100;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background-color var(--dur) var(--ease),border-color var(--dur) var(--ease),backdrop-filter var(--dur) var(--ease);
}
.site-header[data-scrolled]{
  background-color:rgba(5,7,12,.9);
  border-bottom-color:rgba(147,162,189,.18);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  backdrop-filter:blur(18px) saturate(140%);
}
.site-header__inner{
  display:flex;
  align-items:center;
  gap:clamp(14px,2.2vw,36px);
  min-height:var(--header-h);
  transition:min-height var(--dur) var(--ease);
}
.site-header[data-scrolled] .site-header__inner{min-height:var(--header-h-compact)}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  min-width:0;
}
.brand__mark{
  position:relative;
  flex:0 0 auto;
  width:34px;height:34px;
  display:grid;
  place-items:center;
  background:linear-gradient(140deg,var(--cyan),var(--cyan-deep) 52%,var(--violet));
  clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%);
}
.brand__mark i{
  display:block;
  width:9px;height:9px;
  background:var(--ink);
  clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%);
}
.brand__text{display:flex;flex-direction:column;gap:2px;min-width:0}
.brand__name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:19px;
  line-height:1.1;
  letter-spacing:.04em;
}
.brand__line{
  font-family:var(--font-mono);
  font-size:10.5px;
  line-height:1.2;
  letter-spacing:.16em;
  color:var(--muted);
  white-space:nowrap;
}
.brand--footer .brand__mark{width:44px;height:44px}
.brand--footer .brand__name{font-size:23px}
.brand--footer .brand__line{font-size:11px}

/* 主导航 */
.nav{flex:1 1 auto;min-width:0}
.nav__list{
  display:flex;
  align-items:center;
  gap:clamp(4px,1.1vw,16px);
}
.nav__item{flex:0 0 auto}
.nav__link{
  position:relative;
  display:inline-block;
  padding:10px 2px;
  font-size:14.5px;
  letter-spacing:.02em;
  color:rgba(241,245,255,.76);
  transition:color .25s var(--ease);
}
.nav__link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:2px;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .3s var(--ease);
}
.nav__link:hover{color:var(--text)}
.nav__link:hover::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--text);font-weight:600}
.nav__link[aria-current="page"]::after{transform:scaleX(1)}

/* 头部动作区 */
.header-actions{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  margin-left:auto;
}
.nav-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  width:44px;height:40px;
  flex:0 0 auto;
  border-radius:12px;
  border:1px solid var(--line-strong);
  background:rgba(22,35,58,.6);
  color:var(--text);
  transition:background-color .25s var(--ease),border-color .25s var(--ease);
}
.nav-toggle:hover{background:rgba(22,35,58,.95);border-color:var(--glass-line)}
.nav-toggle__box{position:relative;display:block;width:22px;height:14px}
.nav-toggle__bar{
  position:absolute;
  left:0;right:0;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .3s var(--ease);
}
.nav-toggle__bar:nth-child(1){top:0}
.nav-toggle__bar:nth-child(2){bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){transform:translateY(-6px) rotate(-45deg)}

/* 滚动进度 */
.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  overflow:hidden;
  pointer-events:none;
}
.scroll-progress__bar{
  display:block;
  height:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--blue) 38%,var(--violet) 68%,var(--flare));
  transition:transform .12s linear;
}

/* ---------- 9. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,9vw,140px);
  overflow:hidden;
  color:var(--text);
  background-image:linear-gradient(180deg,rgba(12,20,36,0) 0%,var(--panel) 38%,#070C16 100%);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;left:0;right:0;
  height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 44%,var(--flare) 84%,transparent);
  opacity:.85;
}
.site-footer::after{
  content:"";
  position:absolute;
  top:-150px;right:-140px;
  width:520px;height:520px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(142,31,63,.4),transparent 68%);
  pointer-events:none;
}
.footer__inner{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:minmax(230px,1fr) minmax(0,1.65fr) minmax(230px,.95fr);
  gap:clamp(30px,4vw,64px);
  padding:clamp(44px,6vw,84px) 0 clamp(32px,4vw,56px);
}
.footer__masthead{display:flex;flex-direction:column;gap:16px;align-items:flex-start}
.footer__slogan{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(20px,2.2vw,26px);
  line-height:1.36;
  letter-spacing:-.01em;
  max-width:14em;
}
.footer__status{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:7px 14px;
  border-radius:999px;
  border:1px solid rgba(0,233,212,.3);
  background:rgba(0,233,212,.07);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--cyan);
}
.status-dot{
  flex:0 0 auto;
  width:8px;height:8px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 0 rgba(0,233,212,.5);
  animation:status-pulse 2.4s var(--ease) infinite;
}
@keyframes status-pulse{
  0%{box-shadow:0 0 0 0 rgba(0,233,212,.5)}
  70%{box-shadow:0 0 0 10px rgba(0,233,212,0)}
  100%{box-shadow:0 0 0 0 rgba(0,233,212,0)}
}

.footer__grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,2.4vw,32px);
}
.footer__col{min-width:0}
.footer__title{
  display:flex;
  align-items:center;
  gap:9px;
  margin-bottom:16px;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:500;
  letter-spacing:.18em;
  color:var(--muted);
}
.footer__title::before{
  content:"";
  width:7px;height:7px;
  flex:0 0 auto;
  background:var(--cyan);
  clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);
}
.footer__list{display:flex;flex-direction:column;gap:11px}
.footer__link{
  display:inline-block;
  font-size:14.5px;
  color:rgba(241,245,255,.74);
  transition:color .25s var(--ease),transform .25s var(--ease);
}
.footer__link:hover{color:var(--cyan);transform:translateX(3px)}

.footer__contact{display:flex;flex-direction:column;min-width:0}
.footer__contact-row{
  display:flex;
  flex-direction:column;
  gap:3px;
  padding:11px 0;
  border-bottom:1px solid rgba(147,162,189,.12);
}
.footer__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--muted);
}
.footer__value{
  font-size:14.5px;
  line-height:1.6;
  color:var(--text);
  word-break:break-word;
}
.footer__note{
  margin-top:14px;
  font-size:12.5px;
  line-height:1.7;
  color:var(--muted);
}
.footer__contact .btn{margin-top:16px;align-self:flex-start}

.footer__band{
  position:relative;
  z-index:1;
  border-top:1px solid var(--line);
  background-color:rgba(5,7,12,.6);
  background-image:linear-gradient(90deg,rgba(0,233,212,.07),rgba(107,77,246,.09) 50%,rgba(255,75,31,.07));
}
.footer__band-inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 26px;
  padding:18px 0;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.06em;
  color:var(--muted);
}
.footer__copy{margin-left:auto}

/* ---------- 10. 通用正文组件 ---------- */
.glass{
  position:relative;
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  background-image:linear-gradient(160deg,rgba(22,35,58,.8),rgba(12,20,36,.6));
  -webkit-backdrop-filter:blur(14px) saturate(130%);
  backdrop-filter:blur(14px) saturate(130%);
  box-shadow:0 24px 60px -36px rgba(0,0,0,.95);
}
.panel{
  padding:clamp(18px,2.4vw,28px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--panel);
}
.panel--glass{
  background-image:linear-gradient(160deg,rgba(22,35,58,.78),rgba(12,20,36,.62));
  -webkit-backdrop-filter:blur(14px) saturate(130%);
  backdrop-filter:blur(14px) saturate(130%);
}

.stat{display:flex;flex-direction:column;gap:4px}
.stat__value{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(22px,2.6vw,32px);
  font-weight:600;
  line-height:1.1;
  letter-spacing:-.01em;
}
.stat__label{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--muted);
}
.stat--cyan .stat__value{color:var(--cyan)}
.stat--flare .stat__value{color:var(--flare)}
.stat--violet .stat__value{color:#B6A6FF}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 11px;
  border-radius:999px;
  border:1px solid var(--line-strong);
  background:rgba(22,35,58,.5);
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--muted);
  white-space:nowrap;
}
.tag--cyan{border-color:rgba(0,233,212,.42);background:rgba(0,233,212,.1);color:var(--cyan)}
.tag--violet{border-color:rgba(107,77,246,.5);background:rgba(107,77,246,.16);color:#C0B2FF}
.tag--flare{border-color:rgba(255,75,31,.45);background:rgba(255,75,31,.14);color:#FFA184}

.data-band{
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  background-image:linear-gradient(90deg,rgba(0,233,212,.06),rgba(107,77,246,.08) 52%,rgba(255,75,31,.06));
}
.data-band__inner{
  display:flex;
  align-items:center;
  gap:clamp(18px,3vw,48px);
  padding:18px 0;
  overflow-x:auto;
  scrollbar-width:thin;
}
.data-band__item{
  display:flex;
  align-items:baseline;
  gap:8px;
  font-size:13px;
  line-height:1.5;
  color:var(--text-soft);
  white-space:nowrap;
}
.data-band__item strong{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  color:var(--text);
}

/* ---------- 11. 图片容器（页面阶段放图用） ---------- */
.media-frame{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  background-image:linear-gradient(150deg,var(--glass),var(--panel) 58%,var(--ink));
}
.media-frame img,
.media-frame video,
.media-frame picture>img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame--diagonal{
  border-radius:0;
  clip-path:polygon(0 6%,100% 0,100% 94%,0 100%);
}
.media-frame--glass::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:linear-gradient(150deg,rgba(0,233,212,.14),transparent 48%);
  mix-blend-mode:screen;
}
.media-frame__caption{
  position:absolute;
  left:0;right:0;bottom:0;
  padding:14px 16px;
  font-size:12.5px;
  line-height:1.6;
  color:var(--text-soft);
  background-image:linear-gradient(0deg,rgba(5,7,12,.88),transparent);
}
.media-frame__tag{
  position:absolute;
  top:12px;left:12px;
  z-index:2;
}

/* ---------- 12. 面包屑 ---------- */
.breadcrumbs{padding:16px 0}
.breadcrumbs__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--muted);
}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs__link{color:rgba(241,245,255,.7);transition:color .25s var(--ease)}
.breadcrumbs__link:hover{color:var(--cyan)}
.breadcrumbs__sep{color:rgba(147,162,189,.45)}

/* ---------- 13. 阅读容器 ---------- */
.prose{
  max-width:68ch;
  font-size:16px;
  line-height:1.75;
  color:var(--text-soft);
}
.prose>*+*{margin-top:1.05em}
.prose h2{
  font-size:clamp(20px,2.2vw,26px);
  font-weight:700;
  color:var(--text);
  letter-spacing:-.01em;
}
.prose h3{
  font-size:17.5px;
  font-weight:700;
  color:var(--text);
}
.prose ul{list-style:none}
.prose ul li{
  position:relative;
  padding-left:18px;
}
.prose ul li::before{
  content:"";
  position:absolute;
  left:0;top:.72em;
  width:7px;height:7px;
  background:var(--cyan);
  clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);
}
.prose a{
  color:var(--cyan);
  border-bottom:1px solid rgba(0,233,212,.36);
  transition:border-color .25s var(--ease);
}
.prose a:hover{border-bottom-color:var(--cyan)}
.prose blockquote{
  padding-left:16px;
  border-left:2px solid rgba(142,31,63,.85);
  color:var(--muted);
}

/* ---------- 14. 可展开内容组 ---------- */
.disclose{
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:rgba(12,20,36,.74);
  overflow:hidden;
}
.disclose+.disclose{margin-top:12px}
.disclose__trigger{
  display:flex;
  align-items:center;
  gap:14px;
  width:100%;
  padding:18px 20px;
  text-align:left;
  font-size:15.5px;
  font-weight:600;
  line-height:1.5;
  color:var(--text);
  transition:background-color .25s var(--ease),color .25s var(--ease);
}
.disclose__trigger:hover{background:rgba(22,35,58,.62)}
.disclose__trigger[aria-expanded="true"]{color:var(--cyan)}
.disclose__index{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--muted);
}
.disclose__icon{
  position:relative;
  flex:0 0 auto;
  width:16px;height:16px;
  margin-left:auto;
}
.disclose__icon::before,
.disclose__icon::after{
  content:"";
  position:absolute;
  background:var(--cyan);
  border-radius:2px;
  transition:transform .3s var(--ease);
}
.disclose__icon::before{left:0;right:0;top:7px;height:2px}
.disclose__icon::after{top:0;bottom:0;left:7px;width:2px}
.disclose__trigger[aria-expanded="true"] .disclose__icon::after{transform:scaleY(0)}
.disclose__panel{
  height:0;
  overflow:hidden;
  transition:height var(--dur) var(--ease);
}
.disclose__body{
  max-width:68ch;
  padding:0 20px 20px;
  font-size:15px;
  line-height:1.75;
  color:var(--text-soft);
}

/* ---------- 15. 显现协议 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 16. 焦点与滚动条 ---------- */
:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:4px;
}
.skip-link:focus-visible{outline-offset:2px}
.data-band__inner::-webkit-scrollbar{height:6px}
.data-band__inner::-webkit-scrollbar-thumb{background:rgba(0,233,212,.34);border-radius:999px}

/* ---------- 17. 响应式 ---------- */
@media (max-width:1023px){
  :root{--header-h:64px}
  .site-header{background-color:rgba(5,7,12,.86);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}
  .site-header__inner{min-height:var(--header-h)}
  .site-header[data-scrolled] .site-header__inner{min-height:var(--header-h)}

  .nav-toggle{display:inline-flex}

  .header-actions__secondary{display:none}

  .nav{
    position:absolute;
    top:100%;left:0;right:0;
    z-index:99;
    flex:1 0 100%;
    max-height:0;
    opacity:0;
    visibility:hidden;
    overflow:hidden;
    background-color:rgba(5,7,12,.97);
    border-bottom:1px solid var(--line);
    -webkit-backdrop-filter:blur(18px);
    backdrop-filter:blur(18px);
    transition:max-height var(--dur) var(--ease),opacity .28s var(--ease),visibility var(--dur) var(--ease);
  }
  .nav[data-open]{
    max-height:72vh;
    opacity:1;
    visibility:visible;
    overflow-y:auto;
  }
  .nav__list{
    flex-wrap:nowrap;
    gap:0;
    overflow-x:auto;
    -webkit-overflow-scrolling:touch;
    scroll-snap-type:x mandatory;
    padding:8px 20px 10px;
  }
  .nav__item{scroll-snap-align:start}
  .nav__link{
    padding:14px 16px;
    font-size:15px;
    white-space:nowrap;
    border-bottom:2px solid transparent;
  }
  .nav__link::after{display:none}
  .nav__link[aria-current="page"]{
    color:var(--text);
    border-bottom-color:var(--cyan);
  }
  body.nav-open{overflow:hidden}

  .split{grid-template-columns:1fr}

  .footer__inner{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .footer__masthead{grid-column:1 / -1}
  .footer__contact{grid-column:1 / -1}
}

@media (max-width:767px){
  .shell,.shell--wide{width:min(100% - 32px,var(--shell))}
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__copy{margin-left:0;flex:1 0 100%}
}

@media (max-width:520px){
  .brand__line{display:none}
  .brand__name{font-size:17px}
  .brand__mark{width:30px;height:30px}
  .header-actions__primary{padding:9px 13px;font-size:13px}
  .header-actions{gap:8px}
  .site-header__inner{gap:10px}
  .footer__grid{grid-template-columns:1fr}
  .footer__slogan{font-size:20px}
  .display-title{letter-spacing:-.02em}
}

/* ---------- 18. 降低动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1;transform:none}
}