/* ============================================================
   竞博品牌站 · 共享样式 /assets/site.css
   母题：刻度与标签 · 深墨蓝画布 · 雾白纸张 · 竞速橙锚点
   ============================================================ */

:root{
  --jb-abyss:#0B1622;
  --jb-navy:#12263C;
  --jb-steel:#2C4257;
  --jb-silver:#A9B6C2;
  --jb-mist:#F1F4F7;
  --jb-orange:#FF5A1F;
  --jb-orange-dark:#B93A0D;
  --jb-green:#2FBF71;
  --jb-amber:#F2B01E;
  --jb-archive:#E7E1D4;
  --jb-ink:#0B1622;
  --jb-body:#3A4C5E;
  --jb-hairline:rgba(44,66,87,.22);
  --jb-hairline-dark:rgba(169,182,194,.2);

  --font-display:"Barlow Condensed","Oswald","Source Han Sans SC","Noto Sans SC",system-ui,sans-serif;
  --font-body:Inter,"Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --wrap-max:1240px;
  --gutter:clamp(20px,4vw,48px);
  --radius-pill:999px;
  --radius-soft:18px;
}

/* ---------- 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--jb-mist);
  color:var(--jb-ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.85;
  font-weight:400;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,figure,blockquote,ul,ol,dl{margin:0}
ul,ol{padding:0}
img{max-width:100%;height:auto;display:block}
button{font:inherit;color:inherit}
a{color:var(--jb-orange-dark);text-decoration:none}
a:hover{color:var(--jb-orange)}
:focus-visible{outline:2px solid var(--jb-green);outline-offset:2px}

/* ---------- 版心与区块 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap-max);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}
.section{padding:clamp(48px,7vw,96px) 0;position:relative}
.section--paper{background:var(--jb-mist);color:var(--jb-ink)}
.section--abyss{background:var(--jb-abyss);color:var(--jb-mist)}
.section--navy{background:var(--jb-navy);color:var(--jb-mist)}
.section--archive{background:var(--jb-archive);color:var(--jb-ink)}
.section__head{max-width:64ch;margin-bottom:clamp(24px,3vw,40px)}
.section__title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(26px,3.4vw,40px);
  line-height:1.12;
  letter-spacing:-.02em;
  margin:0 0 12px;
}
.section__lead{font-size:16.5px;line-height:1.8;color:var(--jb-body);margin:0;max-width:60ch}
.section--abyss .section__title,.section--navy .section__title{color:var(--jb-mist)}
.section--abyss .section__lead,.section--navy .section__lead{color:var(--jb-silver)}
.section--abyss a,.section--navy a{color:var(--jb-mist)}
.section--abyss a:hover,.section--navy a:hover{color:var(--jb-orange)}

.index-label{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--jb-steel);
  border-bottom:1px solid rgba(169,182,194,.55);
  padding-bottom:4px;
  margin-bottom:14px;
}
.section--abyss .index-label,.section--navy .index-label{
  color:var(--jb-silver);
  border-bottom-color:rgba(169,182,194,.35);
}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(20px,2.4vw,32px)}
.grid-12 > .col-3{grid-column:span 3}
.grid-12 > .col-4{grid-column:span 4}
.grid-12 > .col-5{grid-column:span 5}
.grid-12 > .col-6{grid-column:span 6}
.grid-12 > .col-7{grid-column:span 7}
.grid-12 > .col-8{grid-column:span 8}
.grid-12 > .col-9{grid-column:span 9}
.grid-12 > .col-12{grid-column:span 12}
@media (max-width:900px){
  .grid-12{grid-template-columns:1fr}
  .grid-12 > [class^="col-"]{grid-column:1 / -1}
}

.tick-rule{
  height:9px;
  background-image:linear-gradient(to right,rgba(44,66,87,.3) 0 1px,transparent 1px);
  background-size:16px 7px;
  background-position:left bottom;
  background-repeat:repeat-x;
  border:0;
  margin:clamp(24px,3vw,40px) 0;
}
.section--abyss .tick-rule,.section--navy .tick-rule{
  background-image:linear-gradient(to right,rgba(169,182,194,.3) 0 1px,transparent 1px);
}

/* ---------- 正文排版 ---------- */
.prose{max-width:72ch;font-size:16.5px;line-height:1.85;color:var(--jb-body)}
.prose p{margin:0 0 1.2em}
.prose > p:last-child{margin-bottom:0}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.35em}
.prose li{margin-bottom:.45em}
.prose strong{color:var(--jb-ink);font-weight:700}
.prose code{font-family:var(--font-mono);font-size:.92em;background:rgba(44,66,87,.08);padding:2px 6px;border-radius:3px}
.prose h2{font-family:var(--font-display);font-weight:800;font-size:clamp(22px,2.6vw,28px);line-height:1.2;letter-spacing:-.02em;color:var(--jb-ink);margin:1.6em 0 .6em}
.prose h3{font-family:var(--font-display);font-weight:700;font-size:20px;color:var(--jb-ink);margin:1.4em 0 .5em}
.section--abyss .prose,.section--navy .prose{color:var(--jb-silver)}
.section--abyss .prose strong,.section--navy .prose strong,
.section--abyss .prose h2,.section--navy .prose h2,
.section--abyss .prose h3,.section--navy .prose h3{color:var(--jb-mist)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  border-radius:var(--radius-pill);
  border:1px solid transparent;
  background:transparent;
  font-family:var(--font-body);
  font-size:15px;
  font-weight:700;
  letter-spacing:.01em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:background .18s ease-out,color .18s ease-out,border-color .18s ease-out;
}
.btn--accent{background:var(--jb-orange);color:var(--jb-abyss)}
.btn--accent:hover{background:var(--jb-orange-dark);color:#fff}
.btn--ghost{border-color:rgba(169,182,194,.45);color:var(--jb-mist)}
.btn--ghost:hover{border-color:var(--jb-orange);color:var(--jb-orange)}
.btn--quiet{border-color:rgba(44,66,87,.3);color:var(--jb-ink)}
.btn--quiet:hover{border-color:var(--jb-orange);color:var(--jb-orange-dark)}
.btn--sm{padding:9px 16px;font-size:13.5px}

/* ---------- 跳过链接 ---------- */
.skip-link{
  position:absolute;
  left:16px;
  top:-70px;
  z-index:300;
  background:var(--jb-orange);
  color:var(--jb-abyss);
  font-weight:700;
  padding:10px 18px;
  border-radius:var(--radius-pill);
  transition:top .18s ease-out;
}
.skip-link:focus{top:12px;color:var(--jb-abyss)}

/* ---------- 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:120;
  background:var(--jb-abyss);
  color:var(--jb-mist);
  border-bottom:1px solid rgba(169,182,194,.16);
}
.header-inner{
  display:flex;
  align-items:center;
  gap:clamp(12px,2.2vw,30px);
  min-height:76px;
  padding-top:12px;
  padding-bottom:12px;
}
.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;text-decoration:none;color:var(--jb-mist)}
.brand:hover{color:var(--jb-mist)}
.brand__mark{
  position:relative;
  width:34px;height:34px;
  flex:0 0 auto;
  border-radius:11px 4px 11px 4px;
  background:var(--jb-orange);
}
.brand__mark::after{
  content:"";
  position:absolute;
  left:9px;right:9px;top:10px;
  height:2px;
  background:var(--jb-abyss);
  box-shadow:0 6px 0 var(--jb-abyss),0 12px 0 var(--jb-abyss);
}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__line{
  font-family:var(--font-display);
  font-weight:800;
  font-size:17px;
  letter-spacing:.01em;
  color:var(--jb-mist);
}
.brand__tagline{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--jb-silver);
  margin-top:4px;
}
.quick-rail{display:flex;align-items:center;gap:14px;margin-left:auto}
.quick-rail__label{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--jb-silver);
  border-bottom:1px solid rgba(169,182,194,.45);
  padding-bottom:2px;
  white-space:nowrap;
}

.nav-toggle{
  display:none;
  margin-left:auto;
  align-items:center;
  gap:9px;
  padding:9px 15px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(169,182,194,.35);
  background:transparent;
  color:var(--jb-mist);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  cursor:pointer;
  transition:border-color .18s ease-out,color .18s ease-out;
}
.nav-toggle:hover{border-color:var(--jb-orange);color:var(--jb-orange)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:5px;width:16px}
.nav-toggle__bar{display:block;height:2px;border-radius:2px;background:var(--jb-orange);transition:transform .18s ease-out}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:first-child{transform:translateY(3.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:last-child{transform:translateY(-3.5px) rotate(-45deg)}

.site-nav{display:block}
.site-nav__list{display:flex;align-items:center;gap:clamp(10px,1.7vw,22px);list-style:none;margin:0;padding:0}
.site-nav__link{
  position:relative;
  display:inline-block;
  padding:6px 2px;
  font-size:15px;
  font-weight:500;
  letter-spacing:.02em;
  color:var(--jb-silver);
  text-decoration:none;
  transition:color .18s ease-out;
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:var(--jb-orange);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .18s ease-out;
}
.site-nav__link:hover{color:var(--jb-mist)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--jb-mist);font-weight:700}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}

.header-scale{
  height:9px;
  background-image:linear-gradient(to right,rgba(169,182,194,.32) 0 1px,transparent 1px);
  background-size:16px 7px;
  background-position:left bottom;
  background-repeat:repeat-x;
}
.progress-bar{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  background:var(--jb-orange);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .12s linear;
}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--jb-abyss);color:var(--jb-silver);position:relative}
.site-footer::before{
  content:"";
  display:block;
  height:9px;
  background-image:linear-gradient(to right,rgba(255,90,31,.55) 0 1px,transparent 1px);
  background-size:16px 7px;
  background-position:left top;
  background-repeat:repeat-x;
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(220px,1.5fr) repeat(3,minmax(120px,.85fr)) minmax(190px,1.2fr);
  gap:clamp(24px,3vw,48px);
  padding-top:clamp(40px,5vw,68px);
  padding-bottom:clamp(32px,4vw,52px);
}
.footer-brand__title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:20px;
  letter-spacing:-.01em;
  color:var(--jb-mist);
  margin:0 0 10px;
}
.footer-brand__note{font-size:14px;line-height:1.8;color:var(--jb-silver);margin:0 0 16px;max-width:34ch}
.footer-update{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0;
  padding:5px 13px;
  border:1px solid rgba(47,191,113,.42);
  border-radius:var(--radius-pill);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--jb-mist);
}
.footer-update__dot{
  width:8px;height:8px;border-radius:50%;
  background:var(--jb-green);
  box-shadow:0 0 0 3px rgba(47,191,113,.18);
}
.footer-col__title{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--jb-silver);
  border-bottom:1px solid rgba(169,182,194,.25);
  padding-bottom:8px;
  margin:0 0 14px;
}
.footer-col__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}
.footer-link{
  position:relative;
  display:inline-block;
  font-size:14.5px;
  color:var(--jb-silver);
  text-decoration:none;
  transition:color .18s ease-out;
}
.footer-link::after{
  content:"";
  position:absolute;
  left:0;bottom:-2px;
  width:0;height:1px;
  background:var(--jb-orange);
  transition:width .18s ease-out;
}
.footer-link:hover{color:var(--jb-mist)}
.footer-link:hover::after{width:100%}
.footer-contact__item{display:flex;flex-direction:column;gap:2px;margin:0 0 12px}
.footer-contact__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:rgba(169,182,194,.62);
}
.footer-contact__value{font-family:var(--font-mono);font-size:13.5px;line-height:1.65;color:var(--jb-mist);word-break:break-word}
.footer-legal{background:#08111B;border-top:1px solid rgba(169,182,194,.16)}
.footer-legal__inner{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:8px 24px;
  padding-top:18px;
  padding-bottom:22px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.02em;
  line-height:1.7;
  color:rgba(169,182,194,.75);
}
.footer-legal__inner p{margin:0}

@media (max-width:1080px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
}
@media (max-width:560px){
  .footer-grid{grid-template-columns:1fr}
}

/* ---------- 面包屑 ---------- */
.breadcrumb{padding:20px 0 0}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  list-style:none;
  margin:0;
  padding:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
}
.breadcrumb__item{display:inline-flex;align-items:center;color:var(--jb-steel)}
.breadcrumb__item::after{content:"/";margin-left:8px;color:rgba(44,66,87,.45)}
.breadcrumb__item:last-child::after{display:none}
.breadcrumb__link{color:var(--jb-steel);text-decoration:none}
.breadcrumb__link:hover{color:var(--jb-orange)}
.breadcrumb__current{color:var(--jb-ink)}
.section--abyss .breadcrumb__item,.section--navy .breadcrumb__item{color:var(--jb-silver)}
.section--abyss .breadcrumb__link,.section--navy .breadcrumb__link{color:var(--jb-silver)}
.section--abyss .breadcrumb__current,.section--navy .breadcrumb__current{color:var(--jb-mist)}

/* ---------- 编号步骤 ---------- */
.step-list{list-style:none;margin:0;padding:0}
.step{
  position:relative;
  display:grid;
  grid-template-columns:56px minmax(0,1fr);
  gap:18px;
  padding:22px 0;
}
.step::before{
  content:"";
  position:absolute;
  left:13px;
  top:56px;
  bottom:-2px;
  width:1px;
  background:linear-gradient(180deg,rgba(255,90,31,.5),rgba(44,66,87,.22));
}
.step:last-child::before{display:none}
.step__num{
  font-family:var(--font-mono);
  font-size:24px;
  font-weight:600;
  line-height:1;
  color:var(--jb-orange);
  padding-top:4px;
}
.step__title{
  font-family:var(--font-display);
  font-weight:700;
  font-size:20px;
  letter-spacing:-.01em;
  color:var(--jb-ink);
  margin:0 0 6px;
}
.step__text{margin:0;font-size:15.5px;line-height:1.8;color:var(--jb-body);max-width:62ch}
.section--abyss .step__title,.section--navy .step__title{color:var(--jb-mist)}
.section--abyss .step__text,.section--navy .step__text{color:var(--jb-silver)}
.section--abyss .step::before,.section--navy .step::before{
  background:linear-gradient(180deg,rgba(255,90,31,.6),rgba(169,182,194,.2));
}

/* ---------- 对照表 ---------- */
.data-table{
  width:100%;
  border-collapse:collapse;
  background:var(--jb-mist);
  font-size:15px;
  line-height:1.7;
}
.data-table caption{
  caption-side:top;
  text-align:left;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--jb-steel);
  padding-bottom:10px;
}
.data-table th{
  background:var(--jb-navy);
  color:var(--jb-mist);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.1em;
  text-align:left;
  padding:12px 14px;
}
.data-table td{
  padding:13px 14px;
  border-bottom:1px solid var(--jb-hairline);
  color:var(--jb-body);
  vertical-align:top;
}
.data-table tbody tr{transition:background .18s ease-out}
.data-table tbody tr:hover{background:rgba(255,90,31,.06)}
.data-table tbody tr[data-copy]{cursor:pointer}
.data-table tbody tr.is-copied td{background:rgba(47,191,113,.14)}
.data-table .num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  text-align:right;
  letter-spacing:0;
  color:var(--jb-ink);
}
.data-table .key{font-family:var(--font-mono);color:var(--jb-ink)}

/* ---------- 时间刻度 ---------- */
.timeline{position:relative;padding:26px 0 10px;overflow-x:auto}
.timeline__axis{
  position:relative;
  display:flex;
  gap:clamp(18px,3vw,44px);
  min-width:600px;
  margin:0;
  padding:0;
  list-style:none;
}
.timeline__node{
  position:relative;
  flex:1 1 0;
  padding-top:26px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--jb-steel);
}
.timeline__node::before{
  content:"";
  position:absolute;
  left:0;top:0;
  width:14px;height:14px;
  border-radius:50%;
  background:var(--jb-amber);
}
.timeline__node::after{
  content:"";
  position:absolute;
  left:14px;
  right:calc(-1 * clamp(18px,3vw,44px));
  top:6.5px;
  height:1px;
  background:rgba(44,66,87,.35);
}
.timeline__node:last-child::after{display:none}
.timeline__node[data-current]{color:var(--jb-orange);font-weight:600}
.timeline__node[data-current]::before{background:var(--jb-orange)}
.section--abyss .timeline__node,.section--navy .timeline__node{color:var(--jb-silver)}
.section--abyss .timeline__node::after,.section--navy .timeline__node::after{background:rgba(169,182,194,.28)}
.section--abyss .timeline__node[data-current],.section--navy .timeline__node[data-current]{color:var(--jb-orange)}

/* ---------- 折叠面板 ---------- */
.fold{border-top:1px solid var(--jb-hairline)}
.fold:last-of-type{border-bottom:1px solid var(--jb-hairline)}
.fold__head{
  display:flex;
  align-items:center;
  gap:14px;
  width:100%;
  padding:16px 4px;
  background:none;
  border:0;
  text-align:left;
  cursor:pointer;
  color:inherit;
}
.fold__title{
  flex:1 1 auto;
  font-family:var(--font-display);
  font-weight:700;
  font-size:18px;
  letter-spacing:-.01em;
  margin:0;
}
.fold__state{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:#1E8C52;
  border:1px solid rgba(47,191,113,.45);
  border-radius:var(--radius-pill);
  padding:3px 10px;
  white-space:nowrap;
}
.fold__sign{
  position:relative;
  width:18px;height:18px;
  flex:0 0 auto;
  margin-left:auto;
}
.fold__sign::before,.fold__sign::after{
  content:"";
  position:absolute;
  background:var(--jb-orange);
  transition:transform .22s ease-out;
}
.fold__sign::before{left:0;right:0;top:8px;height:2px}
.fold__sign::after{top:0;bottom:0;left:8px;width:2px}
.fold[data-open] .fold__sign::after{transform:scaleY(0)}
.fold__body{
  max-height:0;
  overflow:hidden;
  background:var(--jb-navy);
  color:var(--jb-mist);
  transition:max-height .22s ease-out;
}
.fold[data-open] .fold__body{max-height:1600px}
.fold__inner{
  padding:18px 20px;
  opacity:0;
  transition:opacity .2s ease-out 60ms;
  font-size:15px;
  line-height:1.8;
  color:var(--jb-silver);
}
.fold[data-open] .fold__inner{opacity:1}
.fold__inner p:first-child{margin-top:0}
.fold__inner p:last-child{margin-bottom:0}

/* ---------- 旁注 ---------- */
.note{
  border-left:2px solid var(--jb-orange);
  padding:4px 0 4px 16px;
  margin:24px 0;
  font-size:15px;
  line-height:1.8;
  color:var(--jb-body);
}
.note__label{
  display:block;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--jb-orange);
  margin-bottom:4px;
}
.section--abyss .note,.section--navy .note{color:var(--jb-silver)}

/* ---------- 状态标记 ---------- */
.badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  padding:4px 10px;
  border-radius:var(--radius-pill);
  border:1px solid currentColor;
  white-space:nowrap;
}
.badge--green{color:#1E8C52;background:rgba(47,191,113,.12)}
.badge--amber{color:#9C6C06;background:rgba(242,176,30,.16)}
.badge--orange{color:#B93A0D;background:rgba(255,90,31,.12)}
.badge--steel{color:var(--jb-steel);background:rgba(44,66,87,.08)}
.section--abyss .badge--green,.section--navy .badge--green{color:#5FD79A;background:rgba(47,191,113,.14)}
.section--abyss .badge--amber,.section--navy .badge--amber{color:#F2B01E;background:rgba(242,176,30,.14)}
.section--abyss .badge--orange,.section--navy .badge--orange{color:#FF8A5C;background:rgba(255,90,31,.14)}
.section--abyss .badge--steel,.section--navy .badge--steel{color:var(--jb-silver);background:rgba(169,182,194,.1)}

/* ---------- 筛选条 ---------- */
.filter-bar{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  align-items:center;
  padding:14px 0;
  margin:24px 0;
  border-top:1px solid var(--jb-hairline);
  border-bottom:1px solid var(--jb-hairline);
}
.filter-btn{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  padding:8px 16px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(44,66,87,.32);
  background:transparent;
  color:var(--jb-steel);
  cursor:pointer;
  transition:background .18s ease-out,color .18s ease-out,border-color .18s ease-out;
}
.filter-btn:hover{border-color:var(--jb-orange);color:var(--jb-orange)}
.filter-btn[aria-pressed="true"]{background:var(--jb-orange);border-color:var(--jb-orange);color:var(--jb-abyss);font-weight:700}
.section--abyss .filter-bar,.section--navy .filter-bar{border-color:var(--jb-hairline-dark)}
.section--abyss .filter-btn,.section--navy .filter-btn{border-color:rgba(169,182,194,.35);color:var(--jb-silver)}
.section--abyss .filter-btn:hover,.section--navy .filter-btn:hover{border-color:var(--jb-orange);color:var(--jb-orange)}
[data-filter-item][hidden]{display:none !important}

/* ---------- 侧边章节索引 ---------- */
.index-rail{
  position:sticky;
  top:118px;
  display:flex;
  flex-direction:column;
  border-left:2px solid rgba(44,66,87,.2);
}
.index-rail__link{
  display:block;
  padding:8px 0 8px 14px;
  margin-left:-2px;
  border-left:2px solid transparent;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.06em;
  color:var(--jb-steel);
  text-decoration:none;
  transition:color .18s ease-out,border-color .18s ease-out;
}
.index-rail__link:hover{color:var(--jb-ink)}
.index-rail__link[aria-current="true"]{color:var(--jb-orange);border-left-color:var(--jb-orange);font-weight:600}
.section--abyss .index-rail,.section--navy .index-rail{border-left-color:rgba(169,182,194,.25)}
.section--abyss .index-rail__link,.section--navy .index-rail__link{color:var(--jb-silver)}
.section--abyss .index-rail__link:hover,.section--navy .index-rail__link:hover{color:var(--jb-mist)}

/* ---------- 有机色块 ---------- */
.slab{
  padding:clamp(20px,3vw,34px);
  background:var(--jb-navy);
  color:var(--jb-mist);
  border-radius:4px 30px 30px 4px;
}
.slab--archive{background:var(--jb-archive);color:var(--jb-ink);border-radius:30px 4px 4px 30px}
.slab--accent{background:var(--jb-orange);color:var(--jb-abyss);border-radius:4px 30px 4px 30px}
.slab__title{
  font-family:var(--font-display);
  font-weight:700;
  font-size:20px;
  letter-spacing:-.01em;
  margin:0 0 10px;
  color:inherit;
}
.slab p{font-size:15.5px;line-height:1.8;margin:0 0 .8em;color:inherit}
.slab p:last-child{margin-bottom:0}

/* ---------- 图片容器 ---------- */
.media-frame{
  position:relative;
  margin:0;
  overflow:hidden;
  border-radius:var(--radius-soft) var(--radius-soft) 4px 4px;
  background-color:var(--jb-navy);
  background-image:
    repeating-linear-gradient(135deg,rgba(169,182,194,.09) 0 1px,transparent 1px 11px),
    linear-gradient(160deg,#12263C 0%,#0B1622 100%);
}
.media-frame__img{display:block;width:100%;height:auto;aspect-ratio:16/10;object-fit:cover}
.media-frame--wide .media-frame__img{aspect-ratio:21/9}
.media-frame--tall .media-frame__img{aspect-ratio:3/4}
.media-frame--square .media-frame__img{aspect-ratio:1/1}
.media-frame__caption{
  display:block;
  padding:10px 14px;
  background:rgba(11,22,34,.92);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  line-height:1.6;
  color:var(--jb-silver);
}
.media-frame--archive{background-image:
  repeating-linear-gradient(135deg,rgba(44,66,87,.12) 0 1px,transparent 1px 11px),
  linear-gradient(160deg,#E7E1D4 0%,#D8D0BF 100%)}
.media-frame--archive .media-frame__caption{background:rgba(11,22,34,.88)}

/* ---------- 返回顶部 ---------- */
.to-top{
  position:fixed;
  right:clamp(16px,3vw,32px);
  bottom:clamp(16px,3vw,32px);
  z-index:110;
  display:grid;
  place-items:center;
  width:46px;height:46px;
  border-radius:50%;
  border:1px solid rgba(169,182,194,.35);
  background:var(--jb-abyss);
  color:var(--jb-mist);
  font-family:var(--font-mono);
  font-size:14px;
  line-height:1;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transition:opacity .2s ease-out,visibility .2s ease-out,background .18s ease-out;
}
.to-top.is-visible{opacity:1;visibility:visible}
.to-top:hover{background:var(--jb-orange);color:var(--jb-abyss);border-color:var(--jb-orange)}

/* ---------- 显现 ---------- */
.reveal{opacity:0;transform:translateY(10px);transition:opacity .42s ease-out,transform .42s ease-out}
.reveal.is-in{opacity:1;transform:none}

/* ---------- 移动端页头 ---------- */
@media (max-width:1079px){
  .site-header{position:sticky}
  .header-inner{min-height:66px}
  .quick-rail__label{display:none}
  .nav-toggle{display:inline-flex;margin-left:0}
  .site-nav{
    position:absolute;
    left:0;right:0;
    top:100%;
    display:none;
    padding:6px 0 16px;
    background:var(--jb-navy);
    border-top:1px solid var(--jb-hairline-dark);
    border-bottom:1px solid var(--jb-hairline-dark);
    max-height:min(74vh,560px);
    overflow-y:auto;
  }
  .site-nav[data-open]{display:block}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__item{width:100%}
  .site-nav__link{
    display:block;
    padding:14px var(--gutter);
    font-size:16px;
    border-bottom:1px solid rgba(169,182,194,.1);
  }
  .site-nav__link::after{display:none}
  .site-nav__link:hover{background:rgba(169,182,194,.06)}
  .site-nav__link[aria-current="page"]{
    color:var(--jb-orange);
    background:rgba(255,90,31,.08);
    box-shadow:inset 3px 0 0 var(--jb-orange);
  }
}

@media (max-width:560px){
  .brand__tagline{display:none}
  .brand__line{font-size:15px}
  .quick-rail{display:none}
  .nav-toggle{margin-left:auto}
  .step{grid-template-columns:40px minmax(0,1fr);gap:14px}
  .step__num{font-size:20px}
  .step::before{left:9px}
}

/* ---------- 动效与无障碍 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal{opacity:1;transform:none}
  .progress-bar{transition:none}
}