/* =========================================================
   贝博体育 · /assets/site.css · V4
   深藏青底 / 高原天空蓝 / 青海湖青 / 熔岩橙
   ========================================================= */

/* ---------- 01 变量 ---------- */
:root{
  --bg:#08192A;
  --bg-2:#0E2740;
  --sky:#3B9EDB;
  --sky-lift:#7CC3E8;
  --sky-deep:#0F5F8E;
  --lake:#17A79B;
  --lava:#FF5A1F;
  --lava-lift:#FF7440;
  --paper:#F3EDE3;
  --sand:#C9C0B2;
  --steel:#7E93A8;
  --ink:#040C14;
  --snow:#F7FAFC;
  --mint:#4ED2A6;

  --line:rgba(126,147,168,.30);
  --line-soft:rgba(126,147,168,.16);
  --line-sky:rgba(59,158,219,.52);
  --on-paper-line:rgba(8,25,42,.14);

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

  --wrap:1240px;
  --gutter:clamp(16px,3.2vw,40px);
  --gap:clamp(18px,2.4vw,34px);
  --cut:16px;
  --radius:14px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow:0 26px 60px -36px rgba(4,12,20,.95);
}

/* ---------- 02 重置与基础 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:132px;
}
body{
  margin:0;
  min-height:100vh;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  color:var(--snow);
  background-color:var(--bg);
  background-image:
    radial-gradient(1100px 620px at 8% -12%, rgba(59,158,219,.22), transparent 62%),
    radial-gradient(900px 520px at 102% 3%, rgba(23,167,155,.16), transparent 66%),
    radial-gradient(780px 720px at 46% 108%, rgba(255,90,31,.08), transparent 70%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
img,svg,video{max-width:100%;display:block}
button,input,select,textarea{font:inherit;color:inherit}
ul,ol{margin:0 0 1.1em;padding-left:1.2em}
::selection{background:var(--lava);color:#160500}
:focus-visible{outline:2px solid var(--lava);outline-offset:3px;border-radius:2px}
#main-content{outline:none}
main{display:block}

/* ---------- 03 中文排版 ---------- */
h1,h2,h3,h4{margin:0 0 .5em;font-family:var(--font-display);font-weight:300;line-height:1.14;letter-spacing:-.02em;color:var(--snow)}
h1{font-size:clamp(42px,6.6vw,100px);font-weight:200;letter-spacing:-.03em}
h2{font-size:clamp(29px,3.6vw,52px)}
h3{font-size:clamp(20px,2vw,27px);font-weight:400;letter-spacing:-.01em}
h4{font-size:17px;font-weight:600;letter-spacing:0;line-height:1.5}
p{margin:0 0 1.1em}
a{color:var(--sky);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--sky-lift)}
strong{font-weight:700;color:var(--snow)}
small{font-size:13px}

.display{
  font-family:var(--font-display);
  font-weight:200;
  font-size:clamp(46px,8vw,132px);
  line-height:1.02;
  letter-spacing:-.035em;
  margin:0;
}
.display__en{
  display:block;
  margin-top:12px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:400;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--steel);
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--steel);
  margin-bottom:14px;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--lava);flex:0 0 auto}
.index-num{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--steel)}
.lede{max-width:38ch;font-size:17px;color:rgba(247,250,252,.74);margin:0 0 1.2em}

/* ---------- 04 布局 ---------- */
.wrap{
  width:100%;
  max-width:calc(var(--wrap) + var(--gutter) * 2);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(54px,7vw,104px)}
.section--tight{padding-block:clamp(34px,4vw,62px)}
.grid{display:grid;gap:var(--gap)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.col-main{grid-column:span 7;min-width:0}
.col-aside{grid-column:span 3;min-width:0}
.col-rail{grid-column:span 2;min-width:0}
.col-half{grid-column:span 6;min-width:0}
.col-full{grid-column:1/-1;min-width:0}
.stack > * + *{margin-top:var(--sp,18px)}
.btn-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px}
.tag-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px}

/* ---------- 05 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  font-family:var(--font-body);
  font-size:14.5px;
  font-weight:600;
  line-height:1.2;
  letter-spacing:.01em;
  color:var(--snow);
  background:transparent;
  border:1px solid var(--line-sky);
  border-radius:999px;
  cursor:pointer;
  text-decoration:none;
  transition:transform .25s var(--ease),background-color .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease);
}
.btn:hover{transform:translateY(-2px);color:var(--snow)}
.btn--cta{
  background:var(--lava);
  border-color:transparent;
  color:#1B0600;
  border-radius:0;
  padding:11px 22px;
  clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,12px 100%,0 calc(100% - 12px));
}
.btn--cta:hover{background:var(--lava-lift);color:#1B0600}
.btn--sky{background:rgba(59,158,219,.14);border-color:var(--line-sky)}
.btn--sky:hover{background:rgba(59,158,219,.26)}
.btn--paper{
  color:var(--bg);
  border-color:var(--on-paper-line);
  border-radius:0;
  clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,12px 100%,0 calc(100% - 12px));
}
.btn--paper:hover{background:rgba(8,25,42,.08);color:var(--bg)}
.btn--wide{padding-inline:28px}

/* ---------- 06 面板 / 标签 / 数字 ---------- */
.panel{
  position:relative;
  background:var(--bg-2);
  border:1px solid var(--line-soft);
  padding:clamp(20px,2.4vw,32px);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
}
.panel--flat{clip-path:none;border-radius:var(--radius)}
.panel--line{background:transparent}
.panel--paper{
  background:var(--paper);
  border-color:var(--on-paper-line);
  color:var(--bg);
}
.panel--paper h1,.panel--paper h2,.panel--paper h3,.panel--paper h4{color:var(--bg)}
.panel--paper p,.panel--paper li{color:rgba(8,25,42,.8)}
.panel--paper a{color:var(--sky-deep)}
.panel--paper a:hover{color:#0A415F}
.panel--paper .eyebrow,.panel--paper .index-num,.panel--paper .data-label{color:rgba(8,25,42,.55)}
.panel--paper .lede{color:rgba(8,25,42,.72)}

.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 11px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--snow);
  background:rgba(59,158,219,.14);
  border:1px solid var(--line-sky);
  border-radius:999px;
  white-space:nowrap;
}
.chip--lake{background:rgba(23,167,155,.16);border-color:rgba(23,167,155,.5)}
.chip--lava{background:rgba(255,90,31,.16);border-color:rgba(255,90,31,.55);color:#FFB394}
.chip--mint{background:rgba(78,210,166,.14);border-color:rgba(78,210,166,.45);color:#9BEBD1}
.chip--paper{background:rgba(8,25,42,.06);border-color:var(--on-paper-line);color:rgba(8,25,42,.72)}

.data{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  letter-spacing:-.02em;
  line-height:1;
  display:block;
}
.data--xl{font-size:clamp(54px,8vw,110px);font-weight:700;color:var(--lava)}
.data--lg{font-size:clamp(32px,4vw,58px);font-weight:600;color:var(--snow)}
.data--md{font-size:clamp(22px,2.4vw,26px);font-weight:600;color:var(--snow)}
.data--sm{font-size:16px;font-weight:500;color:var(--snow)}
.data--mint{color:var(--mint)}
.data--lake{color:var(--lake)}
.data--sky{color:var(--sky)}
.data-label{
  display:block;
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--steel);
}

.rule{height:1px;border:0;margin:0;background:var(--line);}
.diag-rule{
  height:2px;
  border:0;
  margin:0;
  background:linear-gradient(90deg,transparent,var(--sky),var(--lake),var(--lava),transparent);
  transform:rotate(-1.2deg);
  transform-origin:left center;
  opacity:.7;
}
.diagonal-band{position:relative;height:1px;background:var(--line-soft)}
.diagonal-band::after{
  content:"";
  position:absolute;
  right:0;
  bottom:0;
  width:38%;
  height:2px;
  background:linear-gradient(90deg,transparent,var(--lava));
  transform:rotate(-12deg);
  transform-origin:right center;
}

.meter{height:8px;background:rgba(126,147,168,.18);overflow:hidden}
.meter__bar{
  display:block;
  height:100%;
  width:var(--v,60%);
  background:linear-gradient(90deg,var(--sky),var(--lake));
  transition:width .45s var(--ease);
}
.meter--lava .meter__bar{background:linear-gradient(90deg,var(--lava),#FFB394)}
.meter--mint .meter__bar{background:linear-gradient(90deg,var(--lake),var(--mint))}
html.has-js [data-reveal]:not(.is-in) .meter__bar{width:0}

.note{
  border-left:2px solid var(--lake);
  padding:4px 0 4px 16px;
  font-size:14.5px;
  color:rgba(247,250,252,.74);
}
.note--paper{border-color:var(--sky-deep);color:rgba(8,25,42,.74)}

/* ---------- 07 媒体容器（页面阶段放图） ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  background:linear-gradient(150deg,var(--bg-2),#061320);
  border:1px solid var(--line-soft);
}
.media__img{width:100%;height:100%;object-fit:cover;display:block}
.media__scrim{
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(180deg,rgba(4,12,20,0) 36%,rgba(4,12,20,.86));
}
.media__cap{
  position:absolute;
  left:14px;
  right:14px;
  bottom:12px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:rgba(247,250,252,.86);
}
.media__ph{
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  text-align:center;
  padding:12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--steel);
  background:repeating-linear-gradient(135deg,rgba(59,158,219,.08) 0 12px,transparent 12px 24px);
}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--3x4{aspect-ratio:3/4}
.media--wide{aspect-ratio:21/9}
.media--cut{clip-path:polygon(0 0,calc(100% - 22px) 0,100% 22px,100% 100%,22px 100%,0 calc(100% - 22px))}
.media--diag{transform:rotate(-1.2deg)}

/* ---------- 08 表格 ---------- */
.table-wrap{
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  border:1px solid var(--line-soft);
  background:rgba(14,39,64,.5);
}
.data-table{width:100%;min-width:560px;border-collapse:collapse;font-size:15px}
.data-table caption{
  text-align:left;
  padding:14px 16px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--steel);
  border-bottom:1px solid var(--line-soft);
}
.data-table th,.data-table td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line-soft)}
.data-table thead th{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--steel);
  background:rgba(4,12,20,.42);
  white-space:nowrap;
}
.data-table th[data-sort]{cursor:pointer;user-select:none}
.data-table th[data-sort]::after{content:"↕";margin-left:8px;font-size:11px;opacity:.55}
.data-table th[aria-sort="ascending"]::after{content:"↑";opacity:1;color:var(--lava)}
.data-table th[aria-sort="descending"]::after{content:"↓";opacity:1;color:var(--lava)}
.data-table tbody tr:hover{background:rgba(59,158,219,.08)}
.data-table td.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  text-align:right;
}
.data-table .is-hot{color:var(--lava);font-weight:700}

/* ---------- 09 主题筛选 ---------- */
.filter{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.filter__item{position:relative;display:inline-flex}
.filter__item input{position:absolute;width:1px;height:1px;margin:0;opacity:0;pointer-events:none}
.filter__item label{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 15px;
  font-size:13.5px;
  color:rgba(247,250,252,.72);
  background:rgba(14,39,64,.72);
  border:1px solid var(--line-soft);
  border-radius:999px;
  cursor:pointer;
  transition:color .22s var(--ease),background-color .22s var(--ease),border-color .22s var(--ease);
}
.filter__item label:hover{border-color:var(--line-sky);color:var(--snow)}
.filter__item input:checked + label{background:var(--lava);border-color:var(--lava);color:#1B0600;font-weight:700}
.filter__item input:focus-visible + label{outline:2px solid var(--lava);outline-offset:3px}
.filter__count{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--steel)}
.filter__count b{color:var(--lava);font-weight:700}
[data-cat].is-hidden{display:none !important}

/* ---------- 10 长文 / 面包屑 ---------- */
.prose{max-width:38em;font-size:17px}
.prose h2{margin-top:1.7em}
.prose h3{margin-top:1.4em}
.prose ul,.prose ol{padding-left:1.2em}
.prose li{margin-bottom:.5em}
.prose blockquote{
  margin:1.6em 0;
  padding:14px 20px;
  border-left:3px solid var(--lava);
  background:rgba(255,90,31,.07);
  color:rgba(247,250,252,.86);
}
.panel--paper .prose{color:rgba(8,25,42,.84)}
.panel--paper .prose blockquote{background:rgba(255,90,31,.09);color:rgba(8,25,42,.86)}

.breadcrumb{font-size:13px;color:var(--steel);padding-top:6px}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;list-style:none;margin:0;padding:0}
.breadcrumb__item + .breadcrumb__item::before{content:"/";margin-right:8px;color:rgba(126,147,168,.5)}
.breadcrumb a{color:var(--steel)}
.breadcrumb a:hover{color:var(--snow)}
.breadcrumb [aria-current="page"]{color:var(--snow)}

/* ---------- 11 显现动画 ---------- */
html.has-js [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
html.has-js [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 12 头部 ---------- */
.skip-link{
  position:absolute;
  left:50%;
  top:6px;
  z-index:200;
  padding:10px 20px;
  border-radius:999px;
  background:var(--lava);
  color:#160500;
  font-size:14px;
  font-weight:700;
  text-decoration:none;
  transform:translate(-50%,-200%);
  transition:transform .22s var(--ease);
}
.skip-link:focus{transform:translate(-50%,0);color:#160500}

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  padding-top:24px;
  transition:padding-top .3s var(--ease);
}
.site-header[data-compact]{padding-top:10px}

.capsule{
  position:relative;
  display:flex;
  align-items:center;
  gap:14px;
  width:calc(100% - var(--gutter) * 2);
  max-width:var(--wrap);
  margin-inline:auto;
  padding:8px 10px 8px 22px;
  border-radius:999px;
  background:rgba(8,25,42,.74);
  border:1px solid var(--line-sky);
  -webkit-backdrop-filter:blur(16px) saturate(1.3);
  backdrop-filter:blur(16px) saturate(1.3);
  box-shadow:0 22px 46px -30px rgba(4,12,20,1),inset 0 1px 0 rgba(247,250,252,.07);
  transition:padding .3s var(--ease),background-color .3s var(--ease);
}
.site-header[data-compact] .capsule{padding-top:5px;padding-bottom:5px;background:rgba(6,19,32,.92)}

.brand{
  display:flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  text-decoration:none;
  color:var(--snow);
}
.brand:hover{color:var(--snow)}
.brand__mark{font-size:19px;font-weight:700;letter-spacing:.01em;line-height:1;white-space:nowrap}
.brand__meta{
  display:flex;
  align-items:center;
  gap:8px;
  padding-left:12px;
  border-left:1px solid var(--line-soft);
}
.brand__tag{
  max-width:210px;
  overflow:hidden;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--steel);
  white-space:nowrap;
  transition:opacity .25s var(--ease),max-width .3s var(--ease);
}
.brand__ver{
  flex:0 0 auto;
  padding:3px 8px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.12em;
  color:#06131F;
  background:var(--sky);
  clip-path:polygon(0 0,calc(100% - 6px) 0,100% 6px,100% 100%,6px 100%,0 calc(100% - 6px));
}
.site-header[data-compact] .brand__tag{opacity:0;max-width:0}

.nav{position:relative;margin-left:auto}
.nav__list{display:flex;align-items:center;gap:2px;margin:0;padding:0;list-style:none}
.nav__item{position:relative}
.nav__link{
  display:block;
  padding:9px 15px;
  font-size:14.5px;
  line-height:1.4;
  color:rgba(247,250,252,.76);
  border-radius:999px;
  white-space:nowrap;
  transition:color .2s var(--ease),background-color .2s var(--ease);
}
.nav__link:hover{color:var(--snow);background:rgba(247,250,252,.06)}
.nav__link[aria-current="page"]{
  color:var(--snow);
  font-weight:600;
  background:rgba(255,90,31,.13);
}
.nav__indicator{
  position:absolute;
  left:0;
  bottom:0;
  width:0;
  height:3px;
  border-radius:3px;
  background:var(--lava);
  opacity:0;
  pointer-events:none;
  transition:transform .35s var(--ease),width .35s var(--ease),opacity .25s var(--ease);
}

.header__cta{flex:0 0 auto}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  margin-left:auto;
  padding:9px 14px;
  font-size:13.5px;
  font-weight:600;
  color:var(--snow);
  background:rgba(59,158,219,.12);
  border:1px solid var(--line-sky);
  border-radius:999px;
  cursor:pointer;
}
.nav-toggle:hover{background:rgba(59,158,219,.22)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:16px;flex:0 0 auto}
.nav-toggle__bars i{display:block;height:2px;border-radius:2px;background:currentColor;transition:transform .25s var(--ease)}
.site-header[data-open] .nav-toggle__bars i:first-child{transform:translateY(3px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars i:last-child{transform:translateY(-3px) rotate(-45deg)}
.nav-toggle__text{letter-spacing:.04em}

.scroll-progress{position:absolute;left:0;right:0;top:0;height:2px;pointer-events:none}
.scroll-progress__bar{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:left center;
  background:linear-gradient(90deg,var(--sky),var(--lake) 55%,var(--lava));
}

/* ---------- 13 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,8vw,120px);
  background-color:var(--ink);
  background-image:repeating-linear-gradient(90deg,rgba(126,147,168,.05) 0 1px,transparent 1px 92px);
  border-top:1px solid rgba(59,158,219,.26);
  color:rgba(247,250,252,.7);
  overflow:hidden;
}
.footer__diag{
  position:absolute;
  top:0;
  right:-3%;
  width:52%;
  height:8px;
  pointer-events:none;
  background:linear-gradient(90deg,transparent 0,rgba(59,158,219,.75) 24%,rgba(23,167,155,.75) 62%,var(--lava) 100%);
  transform:rotate(-12deg);
  transform-origin:right center;
}
.footer__inner{
  position:relative;
  display:grid;
  grid-template-columns:minmax(190px,1fr) minmax(0,2.2fr) minmax(230px,1.05fr);
  gap:clamp(24px,3.4vw,56px);
  padding-block:clamp(46px,6vw,80px);
}
.footer__brand{min-width:0}
.footer__logo{
  display:inline-block;
  margin-bottom:10px;
  font-family:var(--font-display);
  font-size:26px;
  font-weight:300;
  letter-spacing:-.01em;
  color:var(--snow);
  text-decoration:none;
}
.footer__logo:hover{color:var(--sky-lift)}
.footer__tag{
  margin:0 0 16px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--steel);
}
.footer__ver{
  display:inline-block;
  padding:5px 12px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--sky);
  background:rgba(59,158,219,.08);
  border:1px solid var(--line-sky);
  clip-path:polygon(0 0,calc(100% - 8px) 0,100% 8px,100% 100%,8px 100%,0 calc(100% - 8px));
}
.footer__cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,2vw,32px)}
.footer__col{min-width:0}
.footer__title{
  display:flex;
  align-items:baseline;
  gap:8px;
  margin:0 0 14px;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  color:var(--snow);
}
.footer__num{font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.16em;color:var(--lava)}
.footer__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px}
.footer__link{
  display:inline-block;
  font-size:14.5px;
  color:rgba(247,250,252,.68);
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.footer__link:hover{color:var(--snow);transform:translateX(5px)}

.footer__contact{min-width:0}
.contact-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}
.contact-line{display:flex;flex-wrap:wrap;align-items:center;gap:6px 8px;font-size:14px}
.contact-line__label{
  flex:0 0 66px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--steel);
}
.contact-line__value{
  font-family:var(--font-mono);
  font-size:13.5px;
  letter-spacing:.01em;
  color:var(--snow);
  word-break:break-all;
}
.copy-btn{
  padding:3px 10px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--steel);
  background:transparent;
  border:1px solid var(--line);
  border-radius:999px;
  cursor:pointer;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.copy-btn:hover{color:var(--snow);border-color:var(--line-sky);background:rgba(59,158,219,.12)}
.copy-btn.is-done{color:var(--mint);border-color:rgba(78,210,166,.55);background:rgba(78,210,166,.1)}

.footer__legal{
  position:relative;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px 24px;
  padding-block:22px 34px;
  border-top:1px solid rgba(126,147,168,.2);
  font-size:13px;
  color:var(--steel);
}
.footer__legal p{margin:0}
.footer__legal-text{flex:1 1 320px;max-width:62ch;color:rgba(126,147,168,.95);line-height:1.7}
.footer__icp,.footer__year{font-family:var(--font-mono);letter-spacing:.08em;white-space:nowrap}
.to-top{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-left:auto;
  padding:8px 14px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--steel);
  background:transparent;
  border:1px solid var(--line);
  border-radius:999px;
  cursor:pointer;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.to-top:hover{color:var(--snow);border-color:var(--line-sky)}

/* ---------- 14 响应式 ---------- */
@media (max-width:1180px){
  .col-main{grid-column:span 12}
  .col-aside{grid-column:span 6}
  .col-rail{grid-column:span 6}
}
@media (max-width:980px){
  .site-header{padding-top:14px}
  .capsule{gap:10px;padding:7px 8px 7px 16px}
  .header__cta{display:none}
  .nav-toggle{display:inline-flex}
  .nav{
    position:absolute;
    left:0;
    right:0;
    top:calc(100% + 12px);
    margin-left:0;
    display:none;
    flex-direction:column;
    padding:12px;
    background:rgba(7,22,38,.98);
    border:1px solid var(--line-sky);
    box-shadow:var(--shadow);
    -webkit-backdrop-filter:blur(18px);
    backdrop-filter:blur(18px);
    clip-path:polygon(0 0,calc(100% - 24px) 0,100% 24px,100% 100%,24px 100%,0 calc(100% - 24px));
  }
  .site-header[data-open] .nav{display:flex;animation:bbNavIn .26s var(--ease) both}
  .nav__list{flex-direction:column;align-items:stretch;gap:4px}
  .nav__link{padding:13px 16px;border-radius:10px;font-size:15.5px}
  .nav__indicator{display:none}
  .footer__inner{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .footer__brand,.footer__contact{grid-column:span 2}
  .footer__contact .contact-list{max-width:520px}
}
@keyframes bbNavIn{
  from{opacity:0;transform:translateY(-8px)}
  to{opacity:1;transform:none}
}
@media (max-width:760px){
  body{font-size:16px}
  .col-aside,.col-rail,.col-half{grid-column:1/-1}
  .brand__meta{display:none}
  .footer__cols{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .footer__diag{width:72%}
}
@media (max-width:560px){
  .capsule{padding:6px 6px 6px 14px}
  .brand__mark{font-size:17px}
  .nav-toggle__text{display:none}
  .footer__inner{grid-template-columns:1fr}
  .footer__brand,.footer__contact{grid-column:span 1}
  .footer__cols{grid-template-columns:1fr;gap:22px}
  .footer__legal{gap:10px 16px}
  .to-top{margin-left:0}
  .contact-line__label{flex-basis:58px}
}

/* ---------- 15 无障碍与动效降级 ---------- */
@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;
  }
  html.has-js [data-reveal]{opacity:1;transform:none}
  .btn:hover,.footer__link:hover{transform:none}
}