/* nav.css -- the site's one menu: the sticky bar, its grouped panels, the
   phone menu and quick row, and the footer's site map. The markup is written
   into every page by tools/sync_nav.py from tools/nav.json. Colours carry
   literal fallbacks so pages that don't load pieces.css render it too. No
   backdrop-filter on the bar: it would make the bar the containing block of
   the phone menu's fixed sheet and clip it. */
.sb{position:sticky;top:0;z-index:60;background:rgba(3,4,7,.97);border-bottom:1px solid rgba(255,255,255,.09);
  color:var(--ink-text,#f2f4f8);font-family:var(--mono,"IBM Plex Mono",ui-monospace,monospace)}
.sb a{color:inherit}
.sb-in{max-width:1180px;margin:0 auto;padding:0 20px;height:56px;display:flex;align-items:center;gap:12px}
.sb-brand{display:inline-flex;align-items:center;gap:9px;flex:none;text-decoration:none;font-size:12px;letter-spacing:.06em;white-space:nowrap;
  padding:7px 14px 7px 10px;border-radius:999px;border:1px solid rgba(255,255,255,.09);background:rgba(255,255,255,.03)}
.sb-brand svg{width:22px;height:22px;flex:none}
.sb-brand[aria-current]{border-color:rgba(0,230,118,.35)}
.sb-nav{display:flex;align-items:center;gap:2px;margin-left:auto}
.sb-link,.sb-grp>summary{display:inline-flex;align-items:center;font-size:11.5px;letter-spacing:.08em;text-decoration:none;white-space:nowrap;
  color:var(--ink-muted,#b7c0d0);padding:8px 12px;border-radius:999px;border:1px solid transparent;cursor:pointer;list-style:none}
.sb-grp>summary::-webkit-details-marker,.sb-menu>summary::-webkit-details-marker{display:none}
.sb-grp>summary::after{content:"";width:5px;height:5px;margin:0 0 3px 8px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg)}
.sb-grp[open]>summary::after{margin-bottom:-3px;transform:rotate(-135deg)}
.sb-link:hover,.sb-grp>summary:hover,.sb-grp[open]>summary{color:var(--brass-soft,#69f0ae);border-color:rgba(0,230,118,.35)}
.sb-link[aria-current],.sb-grp.on>summary{color:var(--brass-soft,#69f0ae);border-color:rgba(0,230,118,.35);background:rgba(0,230,118,.07)}
.sb-vh{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.sb-grp{position:relative}
.sb-panel{position:absolute;top:calc(100% + 10px);left:50%;transform:translateX(-50%);width:330px;padding:8px;
  background:#0b0e15;border:1px solid rgba(255,255,255,.12);border-radius:14px;box-shadow:0 26px 60px -18px rgba(0,0,0,.85)}
.sb-panel a,.sb-tiles a,.sb-row{display:block;text-decoration:none;padding:9px 12px;border-radius:10px}
.sb-panel a b,.sb-tiles a b,.sb-row b{display:block;font-family:var(--serif,"Space Grotesk",Inter,system-ui,sans-serif);font-size:15px;font-weight:600;letter-spacing:0;color:var(--ink-text,#f2f4f8)}
.sb-panel a span,.sb-tiles a span,.sb-row span{display:block;font-size:11.5px;line-height:1.45;letter-spacing:.01em;color:var(--ink-muted,#b7c0d0);margin-top:2px}
.sb-panel a:hover,.sb-tiles a:hover,.sb-row:hover{background:rgba(255,255,255,.05)}
.sb-panel a[aria-current],.sb-tiles a[aria-current],.sb-row[aria-current]{background:rgba(0,230,118,.07);box-shadow:inset 3px 0 0 var(--brass,#00e676)}
.sb-blurb{font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--brass,#00e676);padding:6px 12px 6px;margin:0}
.sb-end{display:flex;align-items:center;gap:8px;flex:none}
.sb-menu,.sb-quick{display:none}

/* the phone: brand and Menu in the bar, a quick row of the most-used pages under it */
@media (max-width:860px){
  .sb-in{height:52px;padding:0 12px;gap:8px}
  .sb-nav{display:none}
  .sb-end{margin-left:auto}
  .sb-menu{display:block;margin-left:auto}
  .sb-end+.sb-menu{margin-left:0}
  .sb-menu>summary{display:inline-flex;align-items:center;gap:9px;list-style:none;cursor:pointer;font-size:12px;letter-spacing:.08em;
    color:var(--ink-text,#f2f4f8);padding:9px 14px;min-height:40px;border-radius:999px;border:1px solid rgba(255,255,255,.16)}
  .sb-menu[open]>summary{border-color:rgba(0,230,118,.5);color:var(--brass-soft,#69f0ae)}
  .sb-burger,.sb-burger::before,.sb-burger::after{display:block;width:14px;height:1.5px;background:currentColor;border-radius:1px}
  .sb-burger{position:relative}
  .sb-burger::before,.sb-burger::after{content:"";position:absolute;left:0}
  .sb-burger::before{top:-4.5px}.sb-burger::after{top:4.5px}
  .sb-menu[open] .sb-burger{background:transparent}
  .sb-menu[open] .sb-burger::before{top:0;transform:rotate(45deg)}
  .sb-menu[open] .sb-burger::after{top:0;transform:rotate(-45deg)}
  .sb-sheet{position:fixed;z-index:5;left:0;right:0;top:52px;bottom:0;overflow-y:auto;overscroll-behavior:contain;
    background:#05070b;border-top:1px solid rgba(255,255,255,.09);padding:12px 14px 40px}
  .sb-rows{display:grid;gap:4px;margin-bottom:8px}
  .sb-row{border:1px solid rgba(255,255,255,.09)}
  .sb-sheet .sb-blurb{padding:14px 4px 6px}
  .sb-tiles{display:grid;grid-template-columns:1fr 1fr;gap:6px}
  .sb-tiles a{border:1px solid rgba(255,255,255,.09);min-height:44px;padding:9px 10px}
  .sb-tiles a b{font-size:14px}
  .sb-tiles a span{font-size:11px}
  .sb-more{display:flex;flex-wrap:wrap;gap:6px;margin:18px 0 0}
  .sb-more a{font-size:11.5px;letter-spacing:.06em;text-decoration:none;color:var(--ink-muted,#b7c0d0);padding:9px 12px;border-radius:999px;border:1px solid rgba(255,255,255,.12)}
  .sb-quick{display:flex;gap:6px;overflow-x:auto;padding:0 12px 9px;scrollbar-width:none;
    -webkit-mask-image:linear-gradient(90deg,#000 88%,transparent);mask-image:linear-gradient(90deg,#000 88%,transparent)}
  .sb-quick::-webkit-scrollbar{display:none}
  .sb-quick a{flex:none;font-size:11.5px;letter-spacing:.05em;text-decoration:none;color:var(--ink-muted,#b7c0d0);
    padding:7px 12px;border-radius:999px;border:1px solid rgba(255,255,255,.12)}
  .sb-quick a[aria-current]{color:#04130b;background:var(--brass-soft,#69f0ae);border-color:var(--brass-soft,#69f0ae)}
  .sb-quick a:last-child{margin-right:28px}
  html.sb-locked,html.sb-locked body{overflow:hidden}
}
@media (max-width:380px){.sb-brand span{display:none}.sb-brand{padding:7px 10px}}

/* the footer's site map */
.sb-foot{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:16px 22px;margin:0 0 24px}
.sb-foot .sb-fh{font-family:var(--mono,"IBM Plex Mono",ui-monospace,monospace);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--brass,#00e676);margin:0 0 6px}
.sb-foot a{display:block;width:fit-content;font-family:var(--mono,"IBM Plex Mono",ui-monospace,monospace);font-size:12px;letter-spacing:.02em;
  color:var(--paper-muted,#b9c2d2);text-decoration:none;padding:4px 0}
.sb-foot a:hover,.sb-foot a[aria-current]{color:var(--brass-soft,#69f0ae)}
@media (max-width:760px){.sb-foot{grid-template-columns:repeat(2,minmax(0,1fr))}.sb-foot a{padding:7px 0}}

/* folded explanations: the text is unchanged, only closed by default. Never used for a disclaimer. */
details.fold{border:1px solid rgba(255,255,255,.09);border-radius:14px;margin:20px 0;background:rgba(255,255,255,.02)}
details.fold>summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:12px;padding:14px 18px;
  font-family:var(--mono,"IBM Plex Mono",ui-monospace,monospace);font-size:12px;letter-spacing:.08em;color:var(--paper-muted,#b9c2d2)}
details.fold>summary::-webkit-details-marker{display:none}
details.fold>summary::before{content:"";flex:none;width:7px;height:7px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(-45deg)}
details.fold[open]>summary::before{transform:rotate(45deg)}
details.fold>summary:hover{color:var(--brass-soft,#69f0ae)}
details.fold>.fold-body{padding:2px 18px 16px}

/* site-wide: anchors land below the sticky bar; one visible focus ring */
[id]{scroll-margin-top:72px}
@media (max-width:860px){[id]{scroll-margin-top:104px}}
:focus-visible{outline:2px solid var(--brass-soft,#69f0ae);outline-offset:2px}
@media print{.sb{display:none}}