:root{
  color-scheme:light;
  --paper:#f3efe6;
  --paper-2:#ebe5d9;
  --paper-3:#fffdf8;
  --ink:#183140;
  --ink-soft:#38515f;
  --navy:#163b51;
  --blue:#1e6f93;
  --blue-deep:#175a78;
  --blue-wash:#d9e7ed;
  --line:#b9c3c5;
  --line-strong:#7d9298;
  --muted:#6e7d80;
  --rust:#b56540;
  --green:#3f7661;
  --shadow:0 10px 28px rgba(24,49,64,.09);
  --font-sans:"Avenir Next","Avenir","Segoe UI",Helvetica,Arial,sans-serif;
  --font-display:"Avenir Next Condensed","Arial Narrow","Segoe UI",sans-serif;
  --font-mono:"SFMono-Regular",Consolas,"Liberation Mono","Courier New",monospace;
}
*{box-sizing:border-box}
html{background:var(--paper)}
body{
  margin:0;
  min-height:100vh;
  color:var(--ink);
  font:14px/1.5 var(--font-sans);
  background-color:var(--paper);
  background-image:
    linear-gradient(rgba(30,111,147,.075) 1px,transparent 1px),
    linear-gradient(90deg,rgba(30,111,147,.075) 1px,transparent 1px),
    linear-gradient(rgba(30,111,147,.03) 1px,transparent 1px),
    linear-gradient(90deg,rgba(30,111,147,.03) 1px,transparent 1px),
    radial-gradient(circle at 18% -12%,rgba(255,255,255,.85),transparent 36rem),
    radial-gradient(circle at 96% 10%,rgba(30,111,147,.055),transparent 29rem);
  background-size:40px 40px,40px 40px,8px 8px,8px 8px,auto,auto;
  background-position:-1px -1px,-1px -1px,-1px -1px,-1px -1px,0 0,0 0;
}
body:before{
  content:"";
  position:fixed;
  z-index:-1;
  inset:0;
  pointer-events:none;
  opacity:.16;
  background-image:repeating-linear-gradient(104deg,rgba(82,67,43,.04) 0 1px,transparent 1px 5px);
  mix-blend-mode:multiply;
}
.app-header{
  position:sticky;
  top:0;
  z-index:20;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:20px;
  padding:15px max(24px,calc((100vw - 1120px)/2));
  background:rgba(243,239,230,.94);
  border-bottom:1px solid rgba(22,59,81,.28);
  box-shadow:0 4px 18px rgba(24,49,64,.05);
  backdrop-filter:blur(14px);
}
.brand-lockup{display:flex;align-items:center;gap:13px;min-width:0}
.brand-mark{width:46px;height:46px;flex:0 0 auto}
.brand-copy{min-width:0}
.brand-kicker{
  margin:0 0 1px;
  color:var(--blue-deep);
  font:700 10px/1.1 var(--font-mono);
  letter-spacing:.16em;
  text-transform:uppercase;
}
h1{
  margin:0;
  color:var(--navy);
  font:750 clamp(25px,2.1vw,31px)/1 var(--font-display);
  letter-spacing:.012em;
}
.brand-subtitle{margin:4px 0 0;color:var(--muted);font-size:12.5px;letter-spacing:.015em}
.status-badge{
  position:relative;
  padding:8px 13px 8px 28px;
  border:1px solid rgba(22,59,81,.34);
  border-radius:4px;
  color:var(--ink-soft);
  background:rgba(255,253,248,.68);
  white-space:nowrap;
  font:650 11px/1.2 var(--font-mono);
  letter-spacing:.03em;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.42);
}
.status-badge:before{
  content:"";
  position:absolute;
  left:12px;
  top:50%;
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--blue);
  transform:translateY(-50%);
  box-shadow:0 0 0 3px rgba(30,111,147,.12);
}
main{max-width:1120px;margin:0 auto;padding:34px 24px 28px}
.intro{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) minmax(260px,.5fr);
  gap:24px;
  align-items:end;
  margin-bottom:20px;
}
.intro-copy{max-width:720px}
.eyebrow{
  margin:0 0 7px;
  color:var(--rust);
  font:750 10px/1.2 var(--font-mono);
  text-transform:uppercase;
  letter-spacing:.15em;
}
.intro h2{
  margin:0;
  color:var(--navy);
  font:750 clamp(27px,3.8vw,43px)/1.08 var(--font-display);
  letter-spacing:.008em;
}
.intro p{margin:10px 0 0;color:var(--ink-soft);font-size:15px;max-width:660px}
.intro-note{
  justify-self:end;
  width:min(100%,300px);
  padding:12px 14px;
  border-left:3px solid var(--blue);
  background:rgba(255,253,248,.48);
  color:var(--muted);
  font:600 11px/1.55 var(--font-mono);
}
.grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(340px,.9fr);gap:18px}
.panel{
  position:relative;
  overflow:hidden;
  background:linear-gradient(180deg,rgba(255,253,248,.92),rgba(247,243,234,.94));
  border:1px solid rgba(22,59,81,.28);
  border-radius:5px;
  box-shadow:var(--shadow),inset 0 1px rgba(255,255,255,.7);
}
.panel:before{content:"";position:absolute;left:0;top:0;width:100%;height:3px;background:linear-gradient(90deg,var(--blue),rgba(30,111,147,.08) 56%,transparent)}
.panel:after{content:"";position:absolute;right:-42px;top:-36px;width:185px;height:115px;background:url("./assets/technical-ornament.svg") right top/400px auto no-repeat;opacity:.09;pointer-events:none}
.panel-inner{position:relative;z-index:1;padding:22px}
.section-head{display:flex;align-items:center;gap:11px;margin-bottom:19px;padding-bottom:12px;border-bottom:1px solid rgba(22,59,81,.16)}
.section-index{
  display:grid;
  place-items:center;
  width:31px;
  height:31px;
  flex:0 0 auto;
  border:1px solid var(--blue);
  border-radius:50%;
  background:rgba(217,231,237,.58);
  color:var(--blue-deep);
  font:800 12px/1 var(--font-mono);
  box-shadow:inset 0 0 0 4px rgba(255,253,248,.68);
}
.section-title{margin:0;color:var(--navy);font:750 20px/1.2 var(--font-display);letter-spacing:.02em}
.mode{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:19px;padding:4px;background:rgba(22,59,81,.06);border:1px solid rgba(22,59,81,.18);border-radius:4px}
button,input{font:inherit;outline:none}
button{
  border:1px solid var(--line-strong);
  border-radius:3px;
  padding:9px 11px;
  color:var(--navy);
  background:#eee9de;
  font-weight:700;
  cursor:pointer;
  box-shadow:0 2px 0 rgba(22,59,81,.08);
  transition:background .15s ease,border-color .15s ease,transform .08s ease,box-shadow .15s ease;
}
button:hover{background:#e1e7e5;border-color:var(--blue);box-shadow:0 3px 8px rgba(24,49,64,.10)}
button:active{transform:translateY(1px);box-shadow:none}
.mode button{border-color:transparent;background:transparent;box-shadow:none;color:var(--muted);padding:10px 11px}
.mode button:hover{background:rgba(255,253,248,.55);color:var(--navy)}
.mode button.active{background:var(--blue);border-color:var(--blue-deep);color:#fffdf8;text-shadow:0 1px rgba(0,0,0,.08);box-shadow:0 2px 0 rgba(22,59,81,.10)}
.field{margin-bottom:17px}
label{display:flex;justify-content:space-between;gap:10px;margin-bottom:7px;color:var(--ink-soft);font-size:13px;font-weight:600}
.hint{color:var(--muted);font:500 11px/1.4 var(--font-mono)}
input{
  width:100%;
  border:1px solid var(--line-strong);
  border-radius:3px;
  padding:10px 11px;
  color:var(--ink);
  background:rgba(255,253,248,.88);
  font:650 18px/1.2 var(--font-mono);
  box-shadow:inset 0 1px 1px rgba(24,49,64,.035);
}
input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(30,111,147,.11)}
.result{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:21px}
.result .box{
  position:relative;
  min-width:0;
  padding:14px;
  border:1px solid rgba(22,59,81,.25);
  border-radius:4px;
  background:rgba(217,231,237,.31);
}
.result .box:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--blue)}
.result .box span,.freq span{display:block;color:var(--muted);font:700 10px/1.2 var(--font-mono);text-transform:uppercase;letter-spacing:.08em}
.result .box strong{display:block;margin-top:6px;color:var(--navy);font:760 clamp(22px,2.6vw,29px)/1.1 var(--font-display);letter-spacing:.01em;word-break:break-word}
.cutoffs{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:10px}
.freq{padding:13px 14px;border:1px solid rgba(22,59,81,.17);border-radius:3px;background:rgba(255,253,248,.48)}
.freq strong{display:block;margin-top:5px;color:var(--green);font:700 19px/1.2 var(--font-mono)}
.toolbar{display:flex;gap:8px;flex-wrap:wrap;margin-top:17px;padding-top:17px;border-top:1px solid rgba(22,59,81,.15)}
.small-btn{min-width:116px}
.footer-note{margin-top:13px;color:var(--muted);font-size:12px;line-height:1.55}
.formula-stack{display:grid;gap:8px}
.formula{
  overflow:auto;
  padding:13px 14px;
  border:1px solid rgba(22,59,81,.26);
  border-radius:3px;
  background:rgba(22,59,81,.045);
  color:var(--ink-soft);
  font:600 12px/1.45 var(--font-mono);
  white-space:nowrap;
}
.reference-caption{margin:17px 0 8px;color:var(--rust);font:750 10px/1.2 var(--font-mono);text-transform:uppercase;letter-spacing:.12em}
.table-wrap{border:1px solid rgba(22,59,81,.25);border-radius:4px;overflow:hidden;background:rgba(255,253,248,.5)}
table{width:100%;border-collapse:collapse;font-size:13px}
th,td{padding:8px 10px;border-bottom:1px solid rgba(22,59,81,.13);text-align:right}
th:first-child,td:first-child{text-align:left}
th{background:rgba(22,59,81,.065);color:var(--ink-soft);font:700 10px/1.2 var(--font-mono);text-transform:uppercase;letter-spacing:.08em}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:rgba(217,231,237,.26)}
.reference-key{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  margin-top:15px;
  padding:11px 12px;
  border:1px dashed rgba(22,59,81,.29);
  color:var(--muted);
  font:600 10px/1.45 var(--font-mono);
}
.mini-curve{width:92px;height:34px;flex:0 0 auto}
.site-footer{
  max-width:1120px;
  margin:0 auto;
  padding:0 24px 26px;
  color:var(--muted);
  font:600 10px/1.5 var(--font-mono);
  text-transform:uppercase;
  letter-spacing:.10em;
}
@media(max-width:820px){
  .intro{grid-template-columns:1fr}.intro-note{justify-self:start;width:100%}.grid{grid-template-columns:1fr}.status-badge{display:none}
}
@media(max-width:560px){
  .app-header{padding:12px 14px}.brand-mark{width:39px;height:39px}.brand-kicker{font-size:9px}h1{font-size:24px}
  main{padding:22px 13px 20px}.panel-inner{padding:16px}.result,.cutoffs{grid-template-columns:1fr}.site-footer{padding:0 13px 20px}
}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}