/* ===================================================================
   手机赛场 · 共享样式  /assets/site.css
   深空底 + 切角面板 + 侧边轨道导航 + 数据终端语气
   =================================================================== */

:root{
  --ink-900:#070B10;
  --ink-850:#0B1219;
  --ink-800:#0F1620;
  --ink-700:#1A2430;
  --ink-600:#243040;
  --text:#E8F0F8;
  --text-soft:#C7D5E4;
  --text-dim:#8FA3B8;
  --green:#3BE38F;
  --blue:#2FB8FF;
  --violet:#8B6BFF;
  --orange:#FF8A3D;
  --coral:#FF5A6E;

  --rail:72px;
  --gap:clamp(72px,9vw,116px);
  --pad:clamp(18px,4vw,44px);
  --cut:16px;
  --cut-s:10px;
  --shell:1240px;
  --measure:34em;

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

  --glow-green:0 0 0 1px rgba(59,227,143,.35),0 0 26px rgba(59,227,143,.18);
  --glow-blue:0 0 0 1px rgba(47,184,255,.3),0 0 26px rgba(47,184,255,.14);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  padding-bottom:78px;
  background:var(--ink-900);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:17px;
  font-weight:400;
  line-height:1.8;
  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:radial-gradient(rgba(143,163,184,.09) 1px,transparent 1px);
  background-size:22px 22px;
  opacity:.55;
}
img,svg{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
a{color:var(--blue);text-decoration:none;transition:color .2s ease}
a:hover{color:var(--green)}
h1,h2,h3,h4,p,ul,ol,figure,blockquote,details,summary{margin:0}
ul,ol{padding:0;list-style:none}
:focus-visible{outline:2px solid var(--green);outline-offset:3px;border-radius:2px}
::selection{background:var(--green);color:#04120B}

html[data-nav-open]{overflow:hidden}

/* ---------- 排版体系 ---------- */
.t-display{font-size:clamp(40px,7vw,84px);font-weight:900;line-height:1.05;letter-spacing:-.02em}
.t-h2{font-size:clamp(26px,3.4vw,40px);font-weight:800;line-height:1.2;letter-spacing:-.01em}
.t-h3{font-size:clamp(20px,2.2vw,26px);font-weight:800;line-height:1.3}
.t-h4{font-size:18px;font-weight:700;line-height:1.45}
.t-lead{font-size:clamp(17px,1.6vw,20px);line-height:1.75;color:var(--text-soft);max-width:var(--measure)}
.t-body{color:var(--text-soft);max-width:var(--measure)}
.t-label{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--text-dim);
}
.t-label::before{content:"";width:14px;height:2px;background:var(--green);display:block}
.t-data{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-weight:700;letter-spacing:-.01em;font-size:clamp(20px,3vw,40px);color:var(--green);
}
.t-h2--anchor::after{
  content:"";display:block;width:46px;height:4px;margin-top:16px;
  background:linear-gradient(90deg,var(--green),var(--blue));
  clip-path:polygon(0 0,100% 0,calc(100% - 7px) 100%,0 100%);
}

/* ---------- 布局 ---------- */
#main-content{
  display:block;position:relative;z-index:1;scroll-margin-top:84px;
  padding-top:clamp(24px,4vw,56px);outline:none;
}
.shell{width:100%;max-width:var(--shell);margin:0 auto;padding:0 clamp(16px,4vw,48px)}
.shell--wide{max-width:1440px}
.section{position:relative;margin-top:var(--gap)}
.section:first-child{margin-top:0}
.section__head{display:flex;flex-direction:column;gap:14px;margin-bottom:clamp(20px,3vw,36px)}
.section__num{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--blue);
}
.slant{
  height:3px;margin:var(--gap) 0;transform:skewX(-12deg);
  background:linear-gradient(90deg,var(--green),var(--blue) 38%,var(--violet) 68%,transparent);
  opacity:.75;
}
.speedline{height:1px;width:100%;background:linear-gradient(90deg,transparent,var(--blue),transparent);opacity:.5}
.dotfield{
  background-image:radial-gradient(rgba(47,184,255,.16) 1px,transparent 1px);
  background-size:16px 16px;
}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:minmax(0,1fr)}
.grid--3{grid-template-columns:minmax(0,1fr)}
.grid--split{display:grid;gap:clamp(18px,2.6vw,32px);grid-template-columns:minmax(0,1fr)}
@media (min-width:760px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (min-width:1024px){
  .grid--split{grid-template-columns:minmax(0,62fr) minmax(0,38fr)}
}

/* ---------- 面板 ---------- */
.panel{
  position:relative;
  background:var(--ink-800);
  border:1px solid var(--ink-700);
  padding:var(--pad);
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
}
.panel--raise{background:var(--ink-700);border-color:var(--ink-600)}
.panel--glow{box-shadow:inset 0 0 0 1px rgba(47,184,255,.18),inset 0 0 40px rgba(47,184,255,.06)}
.panel__tag{
  position:absolute;top:0;right:0;padding:5px 12px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:#04120B;background:var(--green);
  clip-path:polygon(10px 0,100% 0,100% 100%,0 100%);
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 24px;font-size:15px;font-weight:800;letter-spacing:.02em;
  background:var(--ink-700);color:var(--text);border:1px solid var(--ink-600);cursor:pointer;
  clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
  transition:background .2s ease,color .2s ease,transform .2s ease,box-shadow .2s ease;
}
.btn:hover{color:var(--text);transform:translateY(-2px)}
.btn--primary{background:linear-gradient(135deg,var(--green),#25C97A);color:#04120B;border-color:transparent}
.btn--primary:hover{color:#04120B;box-shadow:var(--glow-green)}
.btn--ghost{background:transparent;border-color:rgba(47,184,255,.6);color:var(--blue)}
.btn--ghost:hover{background:rgba(47,184,255,.12);border-color:var(--green);color:var(--green)}
.btn--sm{padding:9px 16px;font-size:13px}
.btn__arrow::after{
  content:"";width:8px;height:8px;margin-left:2px;
  border-top:2px solid currentColor;border-right:2px solid currentColor;
  transform:rotate(45deg);
}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:16px 0;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--text-dim);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item+.breadcrumb__item::before{content:"／";color:var(--ink-600)}
.breadcrumb a{color:var(--text-dim)}
.breadcrumb a:hover{color:var(--green)}

/* ---------- 标签 / 胶囊 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;padding:5px 12px;
  font-size:12px;font-weight:700;letter-spacing:.08em;
  color:var(--violet);background:rgba(139,107,255,.12);border:1px solid rgba(139,107,255,.4);
  clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);
}
.tag--green{color:var(--green);background:rgba(59,227,143,.1);border-color:rgba(59,227,143,.4)}
.tag--orange{color:var(--orange);background:rgba(255,138,61,.1);border-color:rgba(255,138,61,.4)}

.chipbar{
  display:flex;gap:10px;overflow-x:auto;padding:6px 2px 14px;
  scrollbar-width:none;-webkit-overflow-scrolling:touch;
}
.chipbar::-webkit-scrollbar{display:none}
.chip{
  flex:0 0 auto;padding:8px 16px;font-size:13px;font-weight:700;cursor:pointer;
  background:transparent;color:var(--text-dim);border:1px solid var(--ink-600);
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.chip:hover{color:var(--text);border-color:var(--blue)}
.chip[aria-pressed="true"]{background:var(--green);border-color:var(--green);color:#04120B}

/* ---------- 横向主题带 ---------- */
.ribbon{
  margin:var(--gap) 0;padding:clamp(18px,3vw,30px) 0;
  background:linear-gradient(90deg,rgba(139,107,255,.16),rgba(47,184,255,.06) 48%,transparent);
  border-top:1px solid rgba(139,107,255,.35);
  border-bottom:1px solid rgba(47,184,255,.22);
  transform:skewY(-.8deg);
}
.ribbon__track{
  display:flex;gap:16px;overflow-x:auto;padding:0 clamp(16px,4vw,48px);
  scroll-snap-type:x mandatory;transform:skewY(.8deg);scrollbar-width:none;
}
.ribbon__track::-webkit-scrollbar{display:none}
.ribbon__item{
  scroll-snap-align:start;flex:0 0 min(78vw,300px);
  padding:16px 18px;background:rgba(15,22,32,.85);border:1px solid var(--ink-700);
  clip-path:polygon(var(--cut-s) 0,100% 0,100% calc(100% - var(--cut-s)),calc(100% - var(--cut-s)) 100%,0 100%,0 var(--cut-s));
}

/* ---------- 折叠面板 ---------- */
.fold{
  margin-top:12px;background:var(--ink-800);border:1px solid var(--ink-700);
  clip-path:polygon(var(--cut-s) 0,100% 0,100% calc(100% - var(--cut-s)),calc(100% - var(--cut-s)) 100%,0 100%,0 var(--cut-s));
}
.fold__head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:16px 20px;font-weight:700;cursor:pointer;list-style:none;
}
.fold__head::-webkit-details-marker{display:none}
.fold__head::after{
  content:"";width:9px;height:9px;flex:0 0 auto;
  border-right:2px solid var(--green);border-bottom:2px solid var(--green);
  transform:rotate(45deg);transition:transform .24s ease;
}
.fold[open] .fold__head::after{transform:rotate(-135deg)}
.fold__body{padding:0 20px 20px;color:var(--text-dim);animation:foldIn .24s ease}
@keyframes foldIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

/* ---------- 数据 ---------- */
.statrow{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;
  background:var(--ink-700);border:1px solid var(--ink-700);
}
@media (min-width:760px){.statrow{grid-template-columns:repeat(4,minmax(0,1fr))}}
.stat{display:flex;flex-direction:column;gap:6px;padding:20px;background:var(--ink-800)}
.stat__value{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(24px,4vw,44px);font-weight:800;line-height:1.05;color:var(--green);
}
.stat__label{font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--text-dim)}
.stat--blue .stat__value{color:var(--blue)}
.stat--violet .stat__value{color:var(--violet)}
.stat--orange .stat__value{color:var(--orange)}

/* ---------- 图片容器（页面阶段放占位） ---------- */
.media{
  position:relative;overflow:hidden;background:var(--ink-700);border:1px solid var(--ink-700);
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
}
.media>img{width:100%;height:100%;object-fit:cover;filter:saturate(1.04) contrast(1.04)}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--21x9{aspect-ratio:21/9}
.media--1x1{aspect-ratio:1/1}
.media--portrait{aspect-ratio:3/4}
.media__placeholder{
  position:absolute;inset:0;display:grid;place-items:center;text-align:center;padding:16px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:rgba(143,163,184,.65);
  background-image:radial-gradient(rgba(143,163,184,.16) 1px,transparent 1px);
  background-size:16px 16px;
}
.media__streaks{
  position:absolute;left:0;right:0;bottom:0;height:48%;pointer-events:none;
  background:linear-gradient(180deg,transparent,rgba(7,11,16,.92));
}
.media__badge{position:absolute;top:12px;left:12px;z-index:2}
.media__caption{
  position:absolute;left:14px;right:14px;bottom:12px;z-index:2;
  font-size:13px;line-height:1.6;color:var(--text-soft);
}

/* ===================================================================
   页头
   =================================================================== */
.site-header{position:relative;z-index:60}

.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:10px 16px;font-weight:800;font-size:14px;
  background:var(--green);color:#04120B;text-decoration:none;
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transform:translateY(-200%);
  transition:transform .2s ease;
}
.skip-link:focus{transform:none;color:#04120B}

/* 阅读进度 */
.progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:120;
  background:rgba(47,184,255,.14);pointer-events:none;
}
.progress__bar{
  display:block;width:100%;height:100%;
  transform:scaleX(var(--scroll-progress,0));transform-origin:0 50%;
  background:linear-gradient(90deg,var(--blue),var(--green));
  box-shadow:0 0 14px rgba(47,184,255,.6);
  transition:transform .12s linear;
}

/* 滚动状态条 */
.topbar{
  position:fixed;top:3px;left:0;right:0;z-index:110;
  height:46px;display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:0 16px;
  background:rgba(15,22,32,.92);
  border-bottom:1px solid var(--ink-700);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  transform:translateY(calc(-100% - 10px));
  transition:transform .3s ease;
}
.topbar[data-visible]{transform:translateY(0)}
.topbar__inner{display:flex;align-items:center;gap:10px;min-width:0}
.topbar__label{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--text-dim);white-space:nowrap}
.topbar__value{
  font-size:14px;font-weight:800;color:var(--green);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.topbar__tag{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--blue);white-space:nowrap}

/* 移动端品牌条 */
.brandbar{
  position:sticky;top:0;z-index:105;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  height:58px;padding:0 16px;
  background:linear-gradient(180deg,rgba(7,11,16,.98),rgba(7,11,16,.86));
  border-bottom:1px solid var(--ink-700);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
}
.brandbar::after{
  content:"";position:absolute;left:0;bottom:-1px;width:40%;height:2px;
  background:linear-gradient(90deg,var(--green),transparent);
  transform:skewX(-24deg);
}

/* 品牌 */
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--text)}
.brand:hover{color:var(--text)}
.brand__mark{
  display:grid;place-items:center;flex:0 0 auto;
  width:36px;height:36px;font-size:18px;font-weight:900;color:#04120B;
  background:linear-gradient(135deg,var(--green),var(--blue));
  clip-path:polygon(9px 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%,0 9px);
}
.brand__text{display:flex;flex-direction:column}
.brand__name{display:block;font-size:16px;font-weight:900;line-height:1.2;letter-spacing:.02em}
.brand__sub{display:block;font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;color:var(--text-dim);line-height:1.5}
.brand--rail{display:none}

/* 移动导航按钮 */
.nav-toggle{
  display:inline-flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;
  min-width:58px;height:42px;padding:0 10px;cursor:pointer;
  background:var(--ink-800);color:var(--text);border:1px solid var(--ink-600);
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transition:color .2s ease,border-color .2s ease,background .2s ease;
}
.nav-toggle:hover{color:var(--green);border-color:var(--green)}
.nav-toggle__icon{position:relative;display:block;width:18px;height:10px}
.nav-toggle__icon i{position:absolute;left:0;width:100%;height:2px;background:currentColor;transition:transform .25s ease,opacity .2s ease}
.nav-toggle__icon i:nth-child(1){top:0}
.nav-toggle__icon i:nth-child(2){top:4px}
.nav-toggle__icon i:nth-child(3){top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon i:nth-child(1){transform:translateY(4px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon i:nth-child(3){transform:translateY(-4px) rotate(-45deg)}
.nav-toggle__label{font-family:var(--font-mono);font-size:10px;letter-spacing:.14em}

/* 轨道导航（移动端为抽屉） */
.rail-nav{
  position:fixed;top:0;left:0;bottom:0;z-index:115;
  width:min(86vw,330px);
  display:flex;flex-direction:column;
  padding:20px 18px calc(20px + env(safe-area-inset-bottom));
  background:linear-gradient(180deg,#0C141C,var(--ink-900));
  border-right:1px solid var(--ink-700);
  overflow-y:auto;overscroll-behavior:contain;
  transform:translateX(-102%);
  transition:transform .32s cubic-bezier(.22,.8,.24,1);
}
.rail-nav[data-open]{transform:translateX(0)}
.rail-nav__cursor{display:none}
.rail-nav__list{display:flex;flex-direction:column;gap:2px;margin-top:16px}
.rail-nav__item{border-bottom:1px solid var(--ink-700)}
.rail-nav__link{
  position:relative;display:flex;align-items:baseline;gap:12px;
  padding:14px 10px;color:var(--text);font-weight:800;
  transition:color .2s ease,background .2s ease;
}
.rail-nav__link:hover{color:var(--green);background:rgba(59,227,143,.06)}
.rail-nav__link[aria-current="page"]{
  color:var(--green);
  background:linear-gradient(90deg,rgba(59,227,143,.14),transparent);
}
.rail-nav__link[aria-current="page"]::before{
  content:"";position:absolute;left:0;top:12px;bottom:12px;width:3px;
  background:var(--green);box-shadow:0 0 12px var(--green);
}
.rail-nav__idx{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--blue)}
.rail-nav__link[aria-current="page"] .rail-nav__idx{color:var(--green)}
.rail-nav__label{font-size:16px;line-height:1.3}
.rail-nav__meta{
  display:flex;flex-wrap:wrap;gap:8px 16px;margin-top:18px;padding-top:16px;
  border-top:1px dashed var(--ink-700);
}
.rail-nav__meta-link{font-size:13px;color:var(--text-dim)}
.rail-nav__meta-link:hover{color:var(--green)}
.rail-nav__cta{
  margin-top:auto;display:flex;align-items:center;justify-content:center;
  padding:14px 18px;font-size:14px;font-weight:800;color:#04120B;
  background:linear-gradient(135deg,var(--green),#25C97A);
  clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
}
.rail-nav__cta:hover{color:#04120B;box-shadow:var(--glow-green)}

/* 遮罩 */
.scrim{
  position:fixed;inset:0;z-index:112;
  background:rgba(4,7,11,.72);
  -webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);
  opacity:0;pointer-events:none;transition:opacity .3s ease;
}
.scrim[data-open]{opacity:1;pointer-events:auto}

/* 底部标签栏 */
.tabbar{
  position:fixed;left:0;right:0;bottom:0;z-index:106;
  display:grid;grid-template-columns:repeat(5,1fr);
  height:62px;padding-bottom:env(safe-area-inset-bottom);
  background:rgba(15,22,32,.96);
  border-top:1px solid var(--ink-700);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
}
.tabbar__link{
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:7px;
  font-size:11px;font-weight:700;color:var(--text-dim);
}
.tabbar__link::before{
  content:"";width:7px;height:7px;background:currentColor;
  transform:rotate(45deg);transition:transform .2s ease,box-shadow .2s ease;
}
.tabbar__link:hover{color:var(--text)}
.tabbar__link[aria-current="page"]{color:var(--green)}
.tabbar__link[aria-current="page"]::before{transform:rotate(45deg) scale(1.3);box-shadow:0 0 12px var(--green)}
.tabbar__label{line-height:1}

/* ===================================================================
   页脚
   =================================================================== */
.site-footer{
  position:relative;z-index:1;margin-top:var(--gap);
  background:linear-gradient(180deg,var(--ink-900),#05080C 72%);
  border-top:1px solid var(--ink-700);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;width:100%;height:3px;
  background:linear-gradient(90deg,var(--green),var(--blue) 38%,var(--violet) 68%,transparent);
  transform:skewX(-12deg);transform-origin:0 0;
}
.footer-inner{
  width:100%;max-width:var(--shell);margin:0 auto;
  padding:clamp(44px,7vw,88px) clamp(16px,4vw,48px) clamp(30px,4vw,52px);
}
.footer-panel{display:grid;gap:clamp(28px,5vw,56px)}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:16px}
.footer-brand__text{max-width:28em;font-size:15px;line-height:1.8;color:var(--text-dim)}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px}
.footer-tag{
  display:inline-block;padding:5px 10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--blue);border:1px solid rgba(47,184,255,.35);background:rgba(47,184,255,.07);
}
.footer-tag--green{color:var(--green);border-color:rgba(59,227,143,.35);background:rgba(59,227,143,.07)}
.footer-cols{display:grid;gap:clamp(20px,3vw,32px);grid-template-columns:repeat(2,minmax(0,1fr))}
.footer-col__title{
  margin-bottom:14px;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.14em;text-transform:uppercase;color:var(--violet);
}
.footer-col__list{display:flex;flex-direction:column;gap:10px}
.footer-col__link{display:inline-block;font-size:14px;color:var(--text-dim);transition:color .2s ease,transform .2s ease}
.footer-col__link:hover{color:var(--green);transform:translateX(4px)}
.footer-contact{
  display:grid;gap:1px;margin-top:clamp(28px,4vw,48px);
  background:var(--ink-700);border:1px solid var(--ink-700);
  grid-template-columns:minmax(0,1fr);
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
}
.footer-contact__item{background:var(--ink-800);padding:18px 20px}
.footer-contact__key{display:block;margin-bottom:6px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--text-dim)}
.footer-contact__val{display:block;font-size:15px;font-weight:700;color:var(--text);word-break:break-all}
.footer-note{
  margin-top:20px;padding-left:12px;font-size:12px;line-height:1.7;color:var(--text-dim);
  border-left:2px solid var(--orange);
}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;
  margin-top:28px;padding-top:20px;border-top:1px dashed var(--ink-700);
  font-family:var(--font-mono);font-size:12px;color:var(--text-dim);
}
.footer-legal__copy{color:var(--text-dim)}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:16px;margin-left:auto}
.footer-legal__links a{color:var(--text-dim)}
.footer-legal__links a:hover{color:var(--green)}

/* 返回顶部 */
.to-top{
  position:fixed;right:16px;bottom:80px;z-index:118;
  width:48px;height:48px;display:grid;place-items:center;cursor:pointer;
  background:rgba(26,36,48,.94);color:var(--text);
  border:1px solid var(--ink-600);border-radius:50%;
  opacity:0;transform:translateY(14px);pointer-events:none;
  transition:opacity .3s ease,transform .3s ease,box-shadow .3s ease,color .2s ease;
}
.to-top[data-visible]{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{color:var(--green);box-shadow:var(--glow-green)}
.to-top__ring{position:absolute;inset:0;width:100%;height:100%;transform:rotate(-90deg)}
.to-top__track{fill:none;stroke:rgba(47,184,255,.22);stroke-width:2}
.to-top__bar{
  fill:none;stroke:var(--blue);stroke-width:2;stroke-linecap:round;
  stroke-dasharray:125.7;stroke-dashoffset:var(--ring,125.7);
  transition:stroke-dashoffset .15s linear;
}
.to-top__arrow{
  width:10px;height:10px;margin-top:3px;
  border-left:2px solid currentColor;border-top:2px solid currentColor;
  transform:rotate(45deg);
}

/* ---------- 显现动效 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(20px);filter:blur(6px);
  transition:opacity .6s ease,transform .6s ease,filter .6s ease;
}
[data-reveal][data-reveal-in]{opacity:1;transform:none;filter:blur(0)}

/* ===================================================================
   断点
   =================================================================== */
@media (max-width:520px){
  .topbar__tag{display:none}
}

@media (min-width:640px){
  .footer-cols{grid-template-columns:repeat(3,minmax(0,1fr))}
}

@media (min-width:760px){
  .footer-contact{grid-template-columns:repeat(3,minmax(0,1fr))}
}

@media (min-width:900px){
  .footer-panel{grid-template-columns:minmax(0,1fr) minmax(0,1.2fr)}
}

@media (min-width:1024px){
  body{padding-bottom:0;padding-left:var(--rail)}
  .topbar{left:var(--rail);padding:0 28px}
  .brandbar{display:none}
  .tabbar{display:none}
  .scrim{display:none}

  .rail-nav{
    width:var(--rail);
    padding:16px 0;
    align-items:center;
    gap:0;
    overflow:visible;
    transform:none;
    background:linear-gradient(180deg,#0B1219,var(--ink-900));
    border-right:1px solid var(--ink-700);
  }
  .rail-nav[data-open]{transform:none}
  .rail-nav__cursor{
    display:block;position:absolute;right:-2px;top:var(--cursor,50%);
    width:4px;height:40px;background:var(--green);
    box-shadow:0 0 14px rgba(59,227,143,.85);
    transform:translateY(-50%);
    transition:top .2s linear;
  }
  .brand--rail{
    display:flex;flex-direction:column;gap:6px;align-items:center;
    width:100%;padding-bottom:14px;border-bottom:1px solid var(--ink-700);
  }
  .brand--rail .brand__mark{width:38px;height:38px;font-size:17px}
  .brand--rail .brand__name{font-size:12px;font-weight:800;letter-spacing:.06em}
  .rail-nav__list{width:100%;margin-top:16px;gap:0;align-items:center}
  .rail-nav__item{width:100%;display:flex;justify-content:center;border-bottom:0}
  .rail-nav__link{
    flex-direction:column;align-items:center;gap:3px;
    width:100%;padding:11px 2px;text-align:center;
  }
  .rail-nav__link:hover{background:rgba(59,227,143,.07)}
  .rail-nav__link[aria-current="page"]{background:rgba(59,227,143,.1)}
  .rail-nav__link[aria-current="page"]::before{left:0;top:8px;bottom:8px}
  .rail-nav__idx{font-size:9px}
  .rail-nav__label{font-size:12px;line-height:1.25;max-width:56px}
  .rail-nav__meta{display:none}
  .rail-nav__cta{
    margin-top:auto;writing-mode:vertical-rl;text-orientation:upright;
    letter-spacing:.2em;font-size:12px;padding:16px 8px;
    color:var(--green);background:transparent;border:1px solid rgba(59,227,143,.45);
    clip-path:polygon(0 0,100% 0,100% 100%,calc(100% - 10px) 100%,0 calc(100% - 10px));
    transition:background .2s ease,color .2s ease;
  }
  .rail-nav__cta:hover{background:var(--green);color:#04120B}
  .to-top{right:28px;bottom:28px}
}

@media (min-width:1280px){
  .section__head{max-width:var(--measure)}
}

/* ---------- 无障碍：减弱动效 ---------- */
@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 !important;transform:none !important;filter:none !important}
  .progress__bar{transition:none}
}