@font-face{font-family:'Fraunces';font-style:normal;font-weight:600;font-display:swap;src:url(/fonts/Fraunces-600.woff2) format('woff2')}
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:500;font-display:swap;src:url(/fonts/IBMPlexMono-500.woff2) format('woff2')}
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:600;font-display:swap;src:url(/fonts/IBMPlexMono-600.woff2) format('woff2')}
@font-face{font-family:'IBM Plex Sans';font-style:normal;font-weight:400 600;font-stretch:100%;font-display:swap;src:url(/fonts/IBMPlexSans-400.woff2) format('woff2')}
/* PeptideGauge. Own tokens; nothing shared with other sites.
   Identity: lab notebook on warm paper, one needle-red accent (hue 349 hashed from domain),
   Fraunces heads, IBM Plex Sans body, IBM Plex Mono for every number. */
:root{
  --paper:#f7f5f0;--paper-2:#efece4;--ink:#1f2328;--ink-2:#4a515a;--ink-3:#5f6670;
  --rule:#d9d4cb;--rule-2:#c4beb2;--needle:#9f4155;--needle-deep:#7d2f41;--needle-soft:#f3e3e6;
  --ok:#2f6b4f;--r:4px;--max:1080px;--prose:720px;
  --head:"Fraunces",Georgia,"Times New Roman",serif;
  --body:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 var(--body)}
a{color:var(--needle-deep);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--needle)}
:focus-visible{outline:2px solid var(--needle);outline-offset:3px}
h1,h2,h3{font-family:var(--head);font-weight:600;line-height:1.15;margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:clamp(2rem,4.5vw,3rem)}
h2{font-size:clamp(1.4rem,2.6vw,1.85rem);margin-top:2.2em}
h3{font-size:1.15rem;margin-top:1.6em}
p{margin:0 0 1.1em}
code,.num,.mono,td.n,th.n{font-family:var(--mono);font-variant-numeric:tabular-nums;font-size:.94em}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.prose{max-width:var(--prose)}
.eyebrow{font-family:var(--mono);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3);margin:0 0 .9em}
.eyebrow b{color:var(--needle);font-weight:600}
.lede{font-size:1.12rem;color:var(--ink-2);max-width:62ch}

/* header: thin ruled strip, not a colored band */
.top{border-bottom:1px solid var(--rule);background:var(--paper)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:60px;gap:20px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-family:var(--head);font-weight:600;font-size:1.2rem}
.brand svg{width:26px;height:26px;flex:none}
nav.main{display:flex;gap:22px;font-size:.95rem}
nav.main a{color:var(--ink-2);text-decoration:none;padding:6px 0;border-bottom:2px solid transparent}
nav.main a:hover,nav.main a[aria-current]{color:var(--ink);border-bottom-color:var(--needle)}

/* page head: ruled like a notebook margin */
.page-head{padding:48px 0 28px;border-bottom:1px solid var(--rule)}
.page-head .wrap{display:grid;grid-template-columns:minmax(0,1fr);gap:8px}

/* calculator layout */
.calc-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:36px;align-items:start;padding:36px 0 8px}
.panel{border:1px solid var(--rule);border-radius:var(--r);background:#fff;padding:22px}
.panel h2{margin-top:0;font-size:1.2rem}
.field{margin:0 0 16px}
.field label{display:block;font-weight:500;font-size:.95rem;margin-bottom:6px}
.field small{display:block;color:var(--ink-3);font-size:.82rem;margin-top:4px}
.row{display:flex;gap:8px;align-items:stretch}
.row>*{flex:1 1 0;min-width:0}
input[type=number],select{width:100%;font:1.05rem var(--mono);font-variant-numeric:tabular-nums;padding:10px 12px;border:1px solid var(--rule-2);border-radius:var(--r);background:#fff;color:var(--ink);min-height:46px}
input[type=number]:focus,select:focus{border-color:var(--needle)}
.seg{display:flex;border:1px solid var(--rule-2);border-radius:var(--r);overflow:hidden}
.seg button{flex:1;border:0;background:#fff;padding:10px 0;font:600 .9rem var(--mono);color:var(--ink-2);cursor:pointer;min-height:46px}
.seg button[aria-pressed=true]{background:var(--ink);color:#fff}
.seg button:active{transform:scale(.98)}
.presets{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 16px}
.presets button{border:1px solid var(--rule-2);background:var(--paper);border-radius:999px;padding:5px 12px;font:500 .85rem var(--mono);cursor:pointer;color:var(--ink-2)}
.presets button:hover{border-color:var(--needle);color:var(--needle-deep)}
.presets button:active{transform:scale(.98)}
.note{font-size:.85rem;color:var(--ink-3);border-left:2px solid var(--rule-2);padding-left:12px;margin:18px 0 0}

/* result: the product */
.result{position:sticky;top:16px}
.answer{font-size:1.08rem;margin:0 0 14px;min-height:2.6em}
.answer b{font-family:var(--mono);font-weight:600}
.big{display:grid;grid-template-columns:1fr 1fr;gap:10px 18px;margin:0 0 18px}
.big div{border-top:1px solid var(--rule);padding-top:10px}
.big .k{font-family:var(--mono);font-size:.74rem;letter-spacing:.07em;text-transform:uppercase;color:var(--ink-3)}
.big .v{font-family:var(--mono);font-size:1.65rem;font-weight:600;line-height:1.2;font-variant-numeric:tabular-nums}
.big .v small{font-size:.8rem;font-weight:500;color:var(--ink-3);margin-left:4px}
.big .v.warn{color:var(--needle-deep)}
.err{color:var(--needle-deep);font-size:.95rem;margin:0 0 12px}
/* the signature element: syringe gauge */
.gauge{margin:6px 0 18px}
.gauge svg{width:100%;height:auto;display:block}
.gauge .cap{font-family:var(--mono);font-size:.78rem;color:var(--ink-3);margin-top:6px;display:flex;justify-content:space-between}
.work{border-top:1px solid var(--rule);padding-top:14px}
.work summary{cursor:pointer;font-weight:500}
.work ol{padding-left:20px;margin:10px 0 0}
.work li{margin:0 0 6px}
.work code{background:var(--paper-2);padding:2px 6px;border-radius:3px}
.copy{margin-top:12px;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.btn{display:inline-block;border:1px solid var(--ink);background:var(--ink);color:#fff;padding:10px 16px;border-radius:var(--r);font:500 .95rem var(--body);cursor:pointer;text-decoration:none}
.btn.ghost{background:transparent;color:var(--ink)}
.btn:hover{background:var(--needle-deep);border-color:var(--needle-deep);color:#fff}
.btn:active{transform:scale(.98)}
.copied{font-family:var(--mono);font-size:.82rem;color:var(--ok)}
.authority{font-family:var(--mono);font-size:.8rem;color:var(--ink-3);margin:14px 0 0;line-height:1.5}

/* prose sections */
section.sec{padding:8px 0 24px}
.spec{font-family:var(--mono);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--needle);margin:0 0 6px}
table{border-collapse:collapse;width:100%;margin:12px 0 24px;font-size:.95rem}
th,td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--rule);vertical-align:top}
th{font-weight:600;font-size:.85rem;color:var(--ink-2);border-bottom:1px solid var(--rule-2)}
.tbl{overflow-x:auto}
.example{border:1px solid var(--rule);border-radius:var(--r);padding:16px 18px;margin:0 0 14px;background:#fff}
.example .spec{margin-bottom:8px}
.example p{margin:0 0 6px}
.callout{background:var(--needle-soft);border-left:3px solid var(--needle);padding:14px 16px;border-radius:0 var(--r) var(--r) 0;margin:20px 0}
.callout p:last-child{margin:0}
ul.plain{padding-left:20px}
ul.plain li{margin:0 0 8px}
.changelog li{margin:0 0 6px}
.changelog time{font-family:var(--mono);color:var(--ink-3);margin-right:8px}
.faq h3{margin-top:1.4em}
.band{background:var(--ink);color:#fff;padding:34px 0;margin:40px 0 0}
.band p{font-family:var(--head);font-size:clamp(1.25rem,2.4vw,1.7rem);margin:0;max-width:28ch;line-height:1.3}
.band .wrap{display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.band a{color:#fff}

/* home */
.home-hero{padding:56px 0 40px;border-bottom:1px solid var(--rule)}
.home-hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.home-hero .art svg{width:100%;height:auto;display:block}
.tools{display:grid;grid-template-columns:1.4fr 1fr;gap:18px;padding:36px 0}
.tool{border:1px solid var(--rule);border-radius:var(--r);padding:22px;background:#fff;text-decoration:none;color:var(--ink);transition:transform .18s ease}
.tool:hover{transform:translateY(-2px);border-color:var(--needle)}
.tool h2{margin:0 0 6px;font-size:1.3rem}
.tool p{margin:0;color:var(--ink-2)}
.tool .soon{font-family:var(--mono);font-size:.74rem;letter-spacing:.07em;text-transform:uppercase;color:var(--ink-3)}
.tool.flat{background:transparent}

/* footer: grid, never flex */
footer.site{border-top:1px solid var(--rule);margin-top:48px;padding:34px 0 40px;font-size:.9rem;color:var(--ink-2)}
footer .cols{display:grid;grid-template-columns:1.8fr 1fr 1fr;gap:32px;align-items:start}
footer .cols a{display:block;margin:0 0 9px;color:var(--ink-2)}
footer .cols p{max-width:44ch}
footer .fine{margin-top:24px;padding-top:16px;border-top:1px solid var(--rule);font-size:.82rem;color:var(--ink-3)}
footer .fine .mono{font-size:.8rem}

@media (max-width:760px){
  .top .wrap{height:auto;padding:12px 16px;flex-wrap:wrap}
  nav.main{gap:16px;font-size:.9rem;width:100%}
  .wrap{padding:0 16px}
  .calc-layout,.home-hero .wrap,.tools{grid-template-columns:1fr;gap:20px}
  .result{position:static}
  .home-hero .art{order:-1;max-width:320px}
  .page-head{padding:32px 0 20px}
  footer .cols{grid-template-columns:1fr 1fr}
  .big .v{font-size:1.45rem}
}
@media (prefers-reduced-motion:reduce){
  .tool{transition:none}
  .gauge *{transition:none!important}
}