/* Safe Perimeter — BB2G brand-kit tokens (ivory / gold / navy).
   House rules that are load-bearing here:
   - On ivory, gold is a RULE and a MARK, never a word. Gold text uses --goldink.
   - The grey ramp stays NEUTRAL. A gold-tinted ramp makes every page read brown.
   - Red is urgent only. Nothing decorative is red.
   - No inline style attributes anywhere: production CSP strips them. */
:root{
  --cream:#f7f1e3; --cream2:#efe6d1; --card:#fffdf8; --panel:#faf5ea;
  --line:#e6d9bc; --line2:#d8c79f;
  --ink:#1c2333; --sub:#4d576b; --muted:#6b7789;
  --navy:#16294a; --navy2:#1f3a68; --blue:#3a5da9;
  --gold:#b8860b; --gold2:#caa12e; --gold3:#e4cd84; --goldsoft:#f3e8c6; --goldink:#7a5c12;
  --red:#b22234; --redsoft:#f7dfe2; --good:#2e8b60; --warn:#c08a1e; --hot:#c96a1f;
  --serif:Georgia,"Palatino Linotype","Times New Roman",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --wrap:76rem; --narrow:46rem;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--cream);color:var(--ink);font:400 1.0625rem/1.65 var(--sans)}
img,video{max-width:100%;display:block}
a{color:var(--navy2);text-decoration-color:var(--line2);text-underline-offset:.18em}
a:hover{text-decoration-color:var(--gold)}
:focus-visible{outline:3px solid var(--blue);outline-offset:2px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 1.25rem}
.narrow{max-width:var(--narrow)}
h1,h2,h3,h4{font-family:var(--serif);color:var(--navy);line-height:1.2;margin:0 0 .5em}
h1{font-size:clamp(2rem,4.6vw,3.1rem);letter-spacing:-.01em}
h2{font-size:clamp(1.5rem,2.8vw,2.05rem);margin-top:2.4rem}
h3{font-size:1.2rem;margin-top:1.8rem}
p{margin:0 0 1.1rem}
.lede{font-size:1.19rem;color:var(--sub)}
.kicker{font:700 .74rem/1 var(--sans);letter-spacing:.26em;text-transform:uppercase;color:var(--muted);margin:0 0 .9rem;display:flex;align-items:center;gap:.7rem}
.kicker::after{content:"";flex:0 0 2.5rem;height:2px;background:var(--gold)}
/* ---- header ---- */
.top{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:40}
.top .wrap{display:flex;align-items:center;gap:1rem;min-height:3.9rem;flex-wrap:wrap}
.brand{font-family:var(--serif);font-size:1.14rem;color:var(--navy);text-decoration:none;font-weight:700;white-space:nowrap}
.brand span{display:block;font:700 .6rem/1 var(--sans);letter-spacing:.24em;color:var(--muted);text-transform:uppercase;margin-top:.28rem}
.nav{display:flex;gap:.15rem;flex-wrap:wrap;margin-left:auto}
.nav a{font:600 .82rem/1 var(--sans);color:var(--sub);text-decoration:none;padding:.5rem .58rem;border-radius:2px;white-space:nowrap}
.nav a:hover{background:var(--panel);color:var(--navy)}
.nav a[aria-current="page"]{color:var(--navy);box-shadow:inset 0 -2px 0 var(--gold)}
/* ---- full-bleed loop band ---- */
.bleed{position:relative;min-height:clamp(20rem,46vh,30rem);display:flex;align-items:flex-end;overflow:hidden;background:var(--navy)}
.bleed.tall{min-height:clamp(26rem,66vh,40rem)}
.bleed video,.bleed img.plate{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0}
.bleed .scrim{position:absolute;inset:0;z-index:1;
  background:linear-gradient(180deg,rgba(8,14,28,.30) 0%,rgba(8,14,28,.52) 42%,rgba(8,14,28,.86) 100%)}
.bleed .inner{position:relative;z-index:2;width:100%;padding:3rem 0 2.3rem}
.bleed h1,.bleed h2,.bleed p{color:#fff}
.bleed h1,.bleed h2{text-shadow:0 2px 18px rgba(0,0,0,.55)}
.bleed p{color:#eef1f7;max-width:42rem;text-shadow:0 1px 12px rgba(0,0,0,.6)}
.bleed .kicker{color:#e4cd84}
.bleed .kicker::after{background:var(--gold3)}
.bleed .credit{position:absolute;right:.85rem;bottom:.5rem;z-index:3;font:400 .68rem/1.4 var(--sans);color:rgba(255,255,255,.72);text-align:right;max-width:22rem}
.bleed .credit a{color:rgba(255,255,255,.85)}
/* ---- blocks ---- */
main{padding-bottom:4rem}
section.pad{padding:3rem 0}
.card{background:var(--card);border:1px solid var(--line);padding:1.5rem}
.panel{background:var(--panel);border:1px solid var(--line);padding:1.5rem}
.grid{display:grid;gap:1.1rem}
.g2{grid-template-columns:repeat(auto-fit,minmax(19rem,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(15rem,1fr))}
.rule{height:1px;background:var(--line);border:0;margin:2.6rem 0}
.note{border-left:3px solid var(--gold);background:var(--panel);padding:1rem 1.2rem;margin:1.4rem 0}
.note.finding{border-left-color:var(--red);background:var(--redsoft)}
.note.finding strong{color:var(--red)}
.note h4{margin:0 0 .4rem;font-size:1.02rem}
.tag{display:inline-block;font:700 .68rem/1 var(--sans);letter-spacing:.14em;text-transform:uppercase;padding:.38rem .55rem;border:1px solid var(--line2);color:var(--sub);background:var(--card)}
.tag.t1{border-color:#b9c6d8;color:var(--navy2)}
.tag.t2{border-color:var(--gold2);color:var(--goldink)}
.tag.t3{border-color:var(--hot);color:var(--hot)}
.tag.t4{border-color:var(--red);color:var(--red)}
.tag.ok{border-color:var(--good);color:var(--good)}
table{width:100%;border-collapse:collapse;font-size:.94rem;margin:1.2rem 0}
th,td{text-align:left;padding:.6rem .7rem;border-bottom:1px solid var(--line);vertical-align:top}
th{font:700 .72rem/1.3 var(--sans);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);border-bottom:2px solid var(--line2)}
.scrollx{overflow-x:auto;-webkit-overflow-scrolling:touch}
code,kbd{font-family:var(--mono);font-size:.9em;background:var(--panel);padding:.12em .35em;border:1px solid var(--line)}
pre{font-family:var(--mono);font-size:.84rem;line-height:1.55;background:#12203a;color:#dfe6f2;padding:1rem 1.1rem;overflow-x:auto;border:1px solid var(--navy)}
pre code{background:none;border:0;color:inherit;padding:0}
.src{font-size:.83rem;color:var(--muted);margin-top:.35rem}
.src a{color:var(--sub)}
ul.clean{list-style:none;padding:0;margin:0 0 1.1rem}
ul.clean li{padding-left:1.3rem;position:relative;margin-bottom:.55rem}
ul.clean li::before{content:"";position:absolute;left:0;top:.62em;width:.5rem;height:1px;background:var(--gold)}
/* ---- instruments ---- */
.tool{border:1px solid var(--line2);background:var(--card);margin:1.8rem 0}
.tool > header{background:var(--navy);color:#fff;padding:.85rem 1.2rem;display:flex;gap:.8rem;align-items:baseline;flex-wrap:wrap}
.tool > header h3{color:#fff;margin:0;font-size:1.06rem}
.tool > header .what{font:400 .84rem/1.4 var(--sans);color:#c3cfe4}
.tool .body{padding:1.3rem}
.ctl{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(13rem,1fr));margin-bottom:1.2rem}
.ctl label{display:block;font:700 .72rem/1.3 var(--sans);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:.35rem}
.ctl input[type=range]{width:100%;accent-color:var(--navy2)}
.ctl select,.ctl input[type=number]{width:100%;font:400 .95rem var(--sans);padding:.45rem .5rem;border:1px solid var(--line2);background:var(--card);color:var(--ink)}
.ctl .val{font:700 1.05rem/1.2 var(--mono);color:var(--navy)}
.out{background:var(--panel);border:1px solid var(--line);padding:1.1rem}
.big{font:700 2rem/1.1 var(--serif);color:var(--navy);margin:0}
.big.warnc{color:var(--hot)} .big.badc{color:var(--red)} .big.okc{color:var(--good)}
.why{font-size:.9rem;color:var(--sub);margin:.6rem 0 0}
.why li{margin-bottom:.3rem}
.readout{display:grid;gap:.9rem;grid-template-columns:repeat(auto-fit,minmax(9.5rem,1fr))}
.readout .k{font:700 .68rem/1 var(--sans);letter-spacing:.13em;text-transform:uppercase;color:var(--muted);margin-bottom:.3rem}
.readout .v{font:700 1.3rem/1.15 var(--mono);color:var(--navy)}
/* ---- check page ---- */
.checks{font-size:.93rem}
.checks .row{display:flex;gap:.8rem;padding:.55rem .2rem;border-bottom:1px solid var(--line);align-items:flex-start}
.checks .st{flex:0 0 4.1rem;font:700 .7rem/1.5 var(--sans);letter-spacing:.1em}
.checks .pass .st{color:var(--good)} .checks .fail .st{color:var(--red)}
.checks .fail{background:var(--redsoft)}
/* ---- footer ---- */
footer.site{background:var(--navy);color:#c8d3e6;padding:2.6rem 0 2rem;font-size:.9rem}
footer.site a{color:#e4cd84}
footer.site .fgrid{display:grid;gap:1.6rem;grid-template-columns:repeat(auto-fit,minmax(14rem,1fr))}
footer.site h4{color:#fff;font-size:.94rem;margin:0 0 .6rem}
footer.site ul{list-style:none;padding:0;margin:0}
footer.site li{margin-bottom:.35rem}
footer.site .base{border-top:1px solid rgba(255,255,255,.16);margin-top:1.8rem;padding-top:1.2rem;display:flex;gap:1rem;flex-wrap:wrap;justify-content:space-between;color:#93a3bd;font-size:.82rem}
.tagline{font:700 .7rem/1 var(--sans);letter-spacing:.28em;text-transform:uppercase;color:#e4cd84}
/* ---- misc ---- */
.skip{position:absolute;left:-9999px}
.skip:focus{left:.5rem;top:.5rem;position:fixed;z-index:99;background:var(--card);padding:.6rem .9rem;border:2px solid var(--navy)}
.crumbs{font-size:.82rem;color:var(--muted);padding:1rem 0 0}
.crumbs a{color:var(--sub)}
.pagenav{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:1.4rem;margin-top:2.6rem}
.pagenav a{font:600 .95rem var(--sans);text-decoration:none;color:var(--navy2)}
.pagenav a:hover{text-decoration:underline}
h2[id],h3[id],section[id]{scroll-margin-top:5rem}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
@media print{
  .top,.nav,footer.site,.bleed video,.pagenav,.skip{display:none!important}
  body{background:#fff;font-size:11pt}
  .bleed{min-height:auto;background:none}
  .bleed .scrim{display:none} .bleed h1,.bleed h2,.bleed p{color:#000;text-shadow:none}
  .bleed .inner{padding:0}
  a{color:#000}
  pre{background:#f4f4f4;color:#000;border:1px solid #ccc}
}
@media (max-width:640px){
  .top .wrap{min-height:auto;padding-top:.6rem;padding-bottom:.5rem}
  .nav{margin-left:0;width:100%}
  .nav a{padding:.42rem .45rem;font-size:.78rem}
  .bleed .credit{position:static;text-align:left;padding:.5rem 1.25rem .8rem;max-width:none;color:rgba(255,255,255,.66)}
  .bleed{align-items:stretch;flex-direction:column;justify-content:flex-end}
}
/* ---- drawn diagram ---- */
.diagram{width:100%;height:auto;border:1px solid var(--line);background:var(--card);margin:1.2rem 0}
.readout .v.mono{font-size:.86rem;word-break:break-all;line-height:1.4}
.ctl input[type=text]{width:100%;font:400 .86rem var(--mono);padding:.45rem .5rem;border:1px solid var(--line2);background:var(--card);color:var(--ink)}
/* ---- specification tables ---- */
.specsec{margin-top:2.6rem}
table.reqs td:first-child{white-space:nowrap;width:1%}
table.reqs td:nth-child(2){white-space:nowrap;width:1%}
table.reqs code{background:none;border:0;padding:0;color:var(--navy2);font-weight:700}
table.reqs tr:target{background:var(--goldsoft)}
@media print{ .specsec{break-inside:auto} table.reqs tr{break-inside:avoid} .note{border-left:3px solid #999} }
/* ---- a sourced figure and its citation ---- */
.figure{display:inline}
.figure strong{color:var(--navy);font-weight:700}