/* ============================================================
   8868体育入口 · 共享站点工具箱 / assets/site.css
   夜间赛场控制室 · 悬浮胶囊导航 · 切角面板 · 记分牌数字
   ============================================================ */

/* ---------- 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;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ---------- 2. tokens ---------- */
:root{
  --ink:#0B0F0E;
  --ink-2:#0F2B24;
  --ink-3:#17392F;
  --lime:#C6F24A;
  --orange:#FF7A2F;
  --paper:#F5F7F4;
  --mute:#8A9490;
  --archive:#E8E1D2;
  --archive-2:#D9CFB8;
  --archive-ink:#1C1A16;
  --orange-down:#B24A16;
  --lime-dim:#9BC22F;

  --line:rgba(245,247,244,.12);
  --line-strong:rgba(245,247,244,.24);
  --line-lime:rgba(198,242,74,.28);
  --veil:rgba(11,15,14,.72);

  --font-head:"Helvetica Neue","Arial Narrow","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body:"Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","Menlo","Consolas",monospace;

  --gutter:72px;
  --shell:1280px;
  --header-h:154px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --radius-pill:999px;
}

/* ---------- 3. base ---------- */
body{
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    radial-gradient(120% 80% at 82% -12%,rgba(23,57,47,.62),transparent 62%),
    radial-gradient(90% 60% at 0% 100%,rgba(15,43,36,.45),transparent 68%);
  background-repeat:no-repeat;
  background-attachment:fixed;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.55;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,h5{
  font-family:var(--font-head);
  font-weight:800;
  line-height:1.05;
  letter-spacing:-.02em;
  text-wrap:balance;
}
h1{font-size:clamp(36px,5.2vw,64px)}
h2{font-size:clamp(28px,3.6vw,48px)}
h3{font-size:clamp(22px,2.4vw,28px)}
h4{font-size:clamp(18px,1.8vw,22px)}
p{text-wrap:pretty}

::selection{background:var(--lime);color:var(--ink)}

:focus-visible{
  outline:2px solid var(--lime);
  outline-offset:3px;
  border-radius:2px;
}

#main-content{
  display:block;
  padding-top:var(--header-h);
  padding-bottom:24px;
}

/* ---------- 4. utilities ---------- */
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.text-lime{color:var(--lime)}
.text-orange{color:var(--orange)}

.shell{
  width:min(var(--shell),calc(100% - 2 * var(--gutter)));
  margin-inline:auto;
}

/* ---------- 5. skip link + progress ---------- */
.skip-link{
  position:fixed;top:10px;left:12px;z-index:200;
  transform:translateY(-220%);
  padding:11px 18px;border-radius:10px;
  background:var(--lime);color:var(--ink);
  font-weight:700;font-size:14px;letter-spacing:.02em;
  transition:transform .22s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

.progress-track{
  position:fixed;inset:0 0 auto 0;height:3px;z-index:120;
  background:rgba(245,247,244,.08);
  pointer-events:none;
}
.progress-bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--lime),var(--orange));
  box-shadow:0 0 12px rgba(198,242,74,.5);
  transition:width .12s linear;
}

/* ---------- 6. header ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:100;
  padding:16px 0 0;
  transition:padding .28s var(--ease);
}
.header-shell{
  width:min(var(--shell),calc(100% - 2 * var(--gutter)));
  margin-inline:auto;
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:9px;
}
.island{
  position:relative;
  width:100%;
  display:flex;
  align-items:center;
  gap:20px;
  padding:10px 12px 10px 16px;
  border:1px solid var(--line-lime);
  border-radius:var(--radius-pill);
  background:rgba(15,43,36,.84);
  box-shadow:0 22px 48px -30px rgba(0,0,0,.95),inset 0 1px 0 rgba(245,247,244,.06);
  -webkit-backdrop-filter:blur(16px) saturate(130%);
  backdrop-filter:blur(16px) saturate(130%);
  transition:padding .28s var(--ease),background .28s var(--ease);
}

.brand{
  display:flex;align-items:center;gap:12px;flex:0 0 auto;
}
.brand-mark{
  display:grid;place-items:center;
  width:38px;height:38px;flex:0 0 auto;
  background:var(--lime);color:var(--ink);
  font-family:var(--font-mono);font-size:15px;font-weight:700;letter-spacing:-.06em;
  clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);
}
.brand-text{display:flex;flex-direction:column;gap:1px;min-width:0}
.brand-name{
  font-family:var(--font-head);font-weight:800;font-size:17px;
  letter-spacing:.01em;color:var(--paper);white-space:nowrap;
}
.brand-tag{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--mute);white-space:nowrap;
}

.nav-toggle{
  display:none;
  align-items:center;gap:8px;
  margin-left:auto;
  padding:10px 14px;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  color:var(--paper);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--lime-dim);color:var(--lime)}
.nav-toggle-bars{display:flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-bars span{display:block;height:2px;background:var(--lime);transition:transform .22s var(--ease),opacity .22s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle-label{line-height:1}

.primary-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  display:inline-flex;align-items:center;
  padding:9px 14px;border-radius:var(--radius-pill);
  font-size:14px;font-weight:600;letter-spacing:.02em;
  color:rgba(245,247,244,.76);
  transition:color .2s var(--ease),background .2s var(--ease);
}
.nav-link:hover{color:var(--paper);background:rgba(198,242,74,.13)}
.nav-link:focus-visible{outline-offset:2px}
.nav-link[aria-current="page"]{
  background:var(--lime);color:var(--ink);
  box-shadow:0 0 0 1px rgba(198,242,74,.5);
}

.quick-bar{
  display:flex;align-items:center;gap:12px;
  padding:6px 16px 6px 12px;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  background:rgba(11,15,14,.74);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  font-size:12px;
  transition:padding .28s var(--ease),background .28s var(--ease);
}
.quick-label{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--orange);
}
.quick-link{
  color:rgba(245,247,244,.82);font-weight:600;letter-spacing:.03em;
  padding:2px 0;border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.quick-link:hover{color:var(--lime);border-bottom-color:var(--lime-dim)}
.quick-divider{display:inline-block;width:1px;height:13px;background:var(--line-strong)}
.quick-note{
  color:var(--mute);font-family:var(--font-mono);
  font-size:10px;letter-spacing:.14em;text-transform:uppercase;
}

.site-header[data-condensed]{padding-top:8px}
.site-header[data-condensed] .island{padding:6px 12px 6px 14px;background:rgba(11,15,14,.9)}
.site-header[data-condensed] .brand-mark{width:32px;height:32px;font-size:13px}
.site-header[data-condensed] .brand-tag{display:none}
.site-header[data-condensed] .nav-link{padding:7px 13px;font-size:13px}
.site-header[data-condensed] .quick-bar{padding:4px 14px 4px 10px}

/* ---------- 7. buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:13px 22px;
  border:1px solid transparent;
  border-radius:var(--radius-pill);
  font-family:var(--font-body);
  font-size:14px;font-weight:700;letter-spacing:.03em;
  transition:transform .2s var(--ease),background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn--primary{background:var(--lime);color:var(--ink)}
.btn--primary:hover{background:#d8ff6b;transform:translateX(3px)}
.btn--ghost{border-color:var(--line-strong);color:var(--paper);background:transparent}
.btn--ghost:hover{border-color:var(--lime);color:var(--lime);transform:translateX(3px)}
.btn--cut{
  border-radius:0;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%);
}

/* ---------- 8. typography blocks ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--lime);
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--lime);display:inline-block}

.display{
  font-family:var(--font-head);font-weight:800;
  font-size:clamp(40px,7.2vw,92px);
  line-height:.94;letter-spacing:-.035em;
}
.lede{
  font-size:clamp(16px,1.5vw,18px);
  line-height:1.65;color:rgba(245,247,244,.78);
  max-width:38em;
}
.prose{max-width:36em;font-size:16px;line-height:1.65;color:rgba(245,247,244,.82)}
.prose p+p{margin-top:14px}
.prose strong{color:var(--paper)}

/* ---------- 9. sections & grids ---------- */
.section{
  width:min(var(--shell),calc(100% - 2 * var(--gutter)));
  margin-inline:auto;
  padding-block:clamp(36px,5vw,72px);
}
.section--flush{padding-top:0}
.section--rule{border-top:1px solid var(--line)}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:18px;margin-bottom:clamp(22px,3vw,34px);
}
.section-title{font-size:clamp(24px,3vw,36px)}

.grid{display:grid;gap:clamp(16px,2vw,24px)}
.grid-12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--rail{grid-template-columns:minmax(200px,4fr) minmax(0,8fr);gap:clamp(20px,3vw,40px);align-items:start}
.span-4{grid-column:span 4}
.span-6{grid-column:span 6}
.span-8{grid-column:span 8}

/* ---------- 10. frame（框景） ---------- */
.frame{
  position:relative;
  padding:clamp(20px,3vw,40px);
  border:1px solid var(--line-lime);
  background:linear-gradient(180deg,rgba(15,43,36,.55),rgba(11,15,14,0) 70%);
}
.frame::before,.frame::after{
  content:"";position:absolute;width:14px;height:14px;border:1px solid var(--lime);
}
.frame::before{top:-1px;left:-1px;border-right:0;border-bottom:0}
.frame::after{bottom:-1px;right:-1px;border-left:0;border-top:0}
.frame-label{
  position:absolute;top:-9px;left:22px;padding:0 8px;
  background:var(--ink);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--lime);
}

/* ---------- 11. panels ---------- */
.panel{
  position:relative;
  padding:clamp(18px,2.2vw,26px);
  border:1px solid var(--line);
  border-radius:4px;
  background:var(--ink-2);
}
.panel--cut{
  border-radius:0;
  background:var(--ink-3);
  border-color:var(--line-lime);
  clip-path:polygon(0 0,calc(100% - 24px) 0,100% 24px,100% 100%,0 100%);
}
.panel--archive{
  background:var(--archive);
  border-color:var(--archive-2);
  color:var(--archive-ink);
}
.panel-kicker{
  display:block;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--mute);margin-bottom:10px;
}
.panel-title{font-size:clamp(18px,2vw,22px);margin-bottom:8px}
.panel-text{font-size:15px;line-height:1.62;color:rgba(245,247,244,.76)}
.panel--archive .panel-kicker{color:#6D5F45}
.panel--archive .panel-text{color:rgba(28,26,22,.78)}

/* ---------- 12. tags ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;
  border:1px solid currentColor;border-radius:var(--radius-pill);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;
  text-transform:uppercase;line-height:1.4;white-space:nowrap;
}
.tag--lime{color:var(--lime)}
.tag--orange{color:var(--orange)}
.tag--archive{color:#6D5F45;border-color:var(--archive-2)}

/* ---------- 13. metrics ---------- */
.metric{display:flex;flex-direction:column;gap:6px}
.metric-value{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(40px,7vw,86px);
  line-height:.88;letter-spacing:-.05em;
  color:var(--lime);font-variant-numeric:tabular-nums;
}
.metric-label{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--mute);
}
.metric--edge{margin-right:calc(-1 * var(--gutter) / 2)}

/* ---------- 14. rail timeline ---------- */
.rail-timeline{
  position:relative;
  display:flex;flex-direction:column;gap:2px;
  border-left:1px solid var(--line);
}
.rail-node{
  position:relative;
  display:grid;grid-template-columns:64px 1fr;gap:14px;align-items:center;
  margin-left:-1px;
  padding:13px 12px 13px 16px;
  border-left:2px solid transparent;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:var(--mute);
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.rail-node:hover{color:var(--paper);background:rgba(198,242,74,.07)}
.rail-node.is-active{
  border-left-color:var(--lime);
  background:rgba(198,242,74,.1);
  color:var(--paper);
}
.rail-date{font-size:14px;letter-spacing:.02em;color:inherit;font-variant-numeric:tabular-nums}
.rail-node.is-active .rail-date{color:var(--lime)}
.rail-label{font-family:var(--font-body);font-size:14px;letter-spacing:.02em}

/* ---------- 15. folds ---------- */
.fold{
  border:1px solid var(--line);
  border-radius:4px;
  background:var(--ink-2);
  overflow:hidden;
}
.fold+.fold{margin-top:10px}
.fold-summary{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:16px 20px;
  font-size:15px;font-weight:700;letter-spacing:.01em;
  cursor:pointer;list-style:none;
}
.fold-summary::-webkit-details-marker{display:none}
.fold-summary::after{
  content:"+";font-family:var(--font-mono);font-size:18px;line-height:1;
  color:var(--lime);transition:transform .2s var(--ease);
}
.fold[open] .fold-summary::after{content:"–"}
.fold[open] .fold-summary{color:var(--paper)}
.fold-body{
  padding:0 20px 18px;
  font-size:15px;line-height:1.65;
  color:rgba(245,247,244,.78);
}

/* ---------- 16. chips ---------- */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  padding:8px 15px;
  border:1px solid var(--line);border-radius:var(--radius-pill);
  font-size:13px;font-weight:600;letter-spacing:.02em;
  color:rgba(245,247,244,.72);background:transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.chip:hover{color:var(--paper);border-color:var(--lime-dim)}
.chip[aria-pressed="true"]{background:var(--lime);border-color:var(--lime);color:var(--ink)}

/* ---------- 17. media containers ---------- */
.media{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:var(--media-ratio,16 / 9);
  border:1px solid var(--line);
  background:
    linear-gradient(135deg,var(--ink-3) 0%,var(--ink-2) 48%,#091714 100%);
}
.media img,.media video,.media svg{
  width:100%;height:100%;object-fit:cover;
}
.media::after{
  content:"";position:absolute;inset:auto 0 0 0;height:42%;
  background:linear-gradient(180deg,transparent,rgba(11,15,14,.78));
  pointer-events:none;
}
.media--tall{aspect-ratio:3 / 4}
.media--wide{aspect-ratio:21 / 9}
.media--diag{
  clip-path:polygon(0 0,100% 0,100% calc(100% - 34px),calc(100% - 34px) 100%,0 100%);
}
.media-caption{
  display:block;margin-top:8px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--mute);
}
.media-grid{
  display:grid;gap:clamp(12px,1.6vw,18px);
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
}

/* ---------- 18. archive zone ---------- */
.archive-zone{
  --az-bg:var(--archive);
  --az-ink:var(--archive-ink);
  --az-line:var(--archive-2);
  padding:clamp(18px,2.4vw,28px);
  border:1px solid var(--az-line);
  border-radius:4px;
  background:var(--az-bg);
  color:var(--az-ink);
  box-shadow:6px 6px 0 0 rgba(217,207,184,.14);
  transition:background .4s var(--ease),color .4s var(--ease),border-color .4s var(--ease),box-shadow .4s var(--ease);
}
.archive-zone[data-view="scoreboard"]{
  --az-bg:var(--ink-2);
  --az-ink:var(--paper);
  --az-line:var(--line-lime);
  box-shadow:6px 6px 0 0 rgba(198,242,74,.12);
}
.archive-zone .tag{border-color:currentColor;color:inherit;opacity:.72}
.view-toggle{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;
  border:1px solid currentColor;border-radius:var(--radius-pill);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.18em;
  text-transform:uppercase;color:inherit;background:transparent;
  transition:background .2s var(--ease),color .2s var(--ease);
}
.view-toggle:hover{background:rgba(198,242,74,.16)}
.view-toggle[aria-pressed="true"]{background:var(--lime);border-color:var(--lime);color:var(--ink)}

/* ---------- 19. breadcrumbs ---------- */
.breadcrumbs{
  width:min(var(--shell),calc(100% - 2 * var(--gutter)));
  margin:0 auto clamp(18px,2.4vw,28px);
}
.breadcrumb-list{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--mute);
}
.breadcrumb-list li+li::before{content:"/";margin-right:8px;color:rgba(245,247,244,.26)}
.breadcrumb-link{color:var(--mute);transition:color .2s var(--ease)}
.breadcrumb-link:hover{color:var(--lime)}
.breadcrumb-current{color:var(--paper)}

/* ---------- 20. motion ---------- */
[data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}
[data-flip].is-flipped{animation:scoreboard-flip .6s var(--ease) both}
@keyframes scoreboard-flip{
  0%{transform:translateY(-10px) rotateX(-38deg);opacity:.25}
  60%{transform:translateY(2px) rotateX(6deg);opacity:1}
  100%{transform:none;opacity:1}
}

/* ---------- 21. footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  padding:clamp(40px,5vw,64px) 0 28px;
  border-top:1px solid var(--line-lime);
  background:linear-gradient(180deg,var(--ink) 0%,var(--ink-2) 46%,#08110F 100%);
  color:var(--paper);
}
.footer-shell{
  width:min(var(--shell),calc(100% - 2 * var(--gutter)));
  margin-inline:auto;
  display:grid;
  grid-template-columns:minmax(240px,1fr) 2fr;
  gap:clamp(28px,4vw,56px);
}
.footer-brand{
  display:flex;flex-direction:column;align-items:flex-start;gap:16px;
}
.brand--footer .brand-mark{
  background:transparent;
  border:1px solid var(--lime);
  color:var(--lime);
  clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);
}
.footer-pitch{
  font-size:15px;line-height:1.62;
  color:rgba(245,247,244,.7);
  max-width:27em;
}
.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,36px);
}
.footer-col{min-width:0}
.footer-col-title{
  font-family:var(--font-mono);font-size:10px;font-weight:700;
  letter-spacing:.2em;text-transform:uppercase;
  color:var(--lime);margin-bottom:14px;
}
.footer-list{display:flex;flex-direction:column;gap:10px}
.footer-link{
  display:inline-block;
  font-size:14px;letter-spacing:.02em;
  color:rgba(245,247,244,.74);
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.footer-link:hover{color:var(--lime);transform:translateX(3px)}
.footer-link--archive{
  color:var(--archive);
  border-bottom:1px dashed rgba(217,207,184,.42);
  padding-bottom:1px;
}
.footer-link--archive:hover{color:var(--archive-2);border-bottom-color:var(--archive-2)}

.footer-meta{
  grid-column:1 / -1;
  display:flex;flex-wrap:wrap;align-items:baseline;gap:12px 32px;
  margin-top:clamp(28px,4vw,44px);
  padding-top:22px;
  border-top:1px solid var(--line);
  font-size:12px;line-height:1.7;color:var(--mute);
}
.footer-contact{flex:1 1 100%;max-width:74ch}
.footer-value{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.02em;
  color:rgba(245,247,244,.9);
}
.footer-note{flex:1 1 320px}
.footer-icp{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  padding:4px 11px;border:1px solid var(--line);border-radius:var(--radius-pill);
  color:rgba(245,247,244,.72);
}
.footer-copy{
  margin-left:auto;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:rgba(245,247,244,.6);
}

/* ---------- 22. responsive ---------- */
@media (max-width:1180px){
  :root{--gutter:44px;--header-h:150px}
  .nav-link{padding:9px 12px;font-size:13px}
  .brand-tag{display:none}
  .metric--edge{margin-right:0}
}

@media (max-width:920px){
  :root{--gutter:24px;--header-h:126px}
  .island{flex-wrap:nowrap;gap:12px}
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:absolute;
    top:calc(100% + 10px);left:0;right:0;
    margin:0;padding:12px;
    border:1px solid var(--line-lime);
    border-radius:20px;
    background:rgba(11,15,14,.96);
    box-shadow:0 34px 60px -32px rgba(0,0,0,.95);
    -webkit-backdrop-filter:blur(18px);
    backdrop-filter:blur(18px);
    display:none;
  }
  .primary-nav[data-open]{display:block}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-link{padding:13px 16px;border-radius:12px;font-size:15px;justify-content:flex-start}
  .site-header[data-condensed] .nav-link{padding:13px 16px;font-size:15px}
  .quick-bar{width:100%;justify-content:flex-start;flex-wrap:wrap;gap:10px 12px}
  .quick-note{margin-left:auto}
  .grid--rail{grid-template-columns:1fr}
  .span-4,.span-6,.span-8{grid-column:span 12}
  .footer-shell{grid-template-columns:1fr;gap:32px}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-copy{margin-left:0}
}

@media (max-width:640px){
  :root{--gutter:20px;--header-h:118px}
  body{font-size:15px}
  .site-header{padding-top:10px}
  .island{padding:8px 10px 8px 12px;gap:10px}
  .brand{gap:10px}
  .brand-mark{width:32px;height:32px;font-size:13px}
  .brand-name{font-size:15px}
  .quick-bar{padding:5px 12px;font-size:11px}
  .quick-note{display:none}
  .nav-toggle{padding:8px 12px;font-size:10px}
  .footer-cols{grid-template-columns:1fr;gap:24px}
  .footer-meta{gap:10px 20px}
  .fold-summary{padding:14px 16px;font-size:14px}
  .fold-body{padding:0 16px 16px}
  .rail-node{grid-template-columns:56px 1fr;padding:12px 10px 12px 14px}
  .metric--edge{margin-right:0}
}

/* ---------- 23. reduced motion ---------- */
@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}
  [data-flip].is-flipped{animation:none}
  .progress-bar{transition:none}
  .footer-link:hover,.btn:hover{transform:none}
}