/* Peptide Research Reference — shared stylesheet
   Restrained, typographic, print-adjacent. Reads as a reference work, not a shop. */

:root{
  --ink:#15181d;
  --ink-2:#3d444e;
  --muted:#6c737f;
  --paper:#ffffff;
  --bg:#f6f6f3;
  --rule:#e2e2dc;
  --accent:#22405c;
  --accent-soft:#eef2f6;
  --warn:#8a6412;
  --warn-soft:#fdf7e7;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  --serif:'Newsreader',Georgia,'Times New Roman',serif;
  --sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --wrap:1080px;
  --measure:68ch;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--sans);font-size:16.5px;line-height:1.62;
  -webkit-font-smoothing:antialiased;
}
body.is-locked{overflow:hidden}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 24px}
.measure{max-width:var(--measure)}

/* ---------- RUO strip ---------- */
.ruo-strip{
  background:var(--ink);color:#d9dde3;font-family:var(--mono);
  font-size:11px;letter-spacing:.09em;text-transform:uppercase;
  padding:9px 0;text-align:center
}

/* ---------- masthead + nav ---------- */
.masthead{background:var(--paper);border-bottom:1px solid var(--rule)}
.masthead__in{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:20px 24px;max-width:var(--wrap);margin:0 auto;flex-wrap:wrap}
.brand{display:block;text-decoration:none;color:var(--ink)}
.brand__name{font-family:var(--serif);font-size:21px;font-weight:600;letter-spacing:-.01em;display:block;line-height:1.15}
.brand__sub{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);display:block;margin-top:3px}
.nav{display:flex;gap:26px;flex-wrap:wrap}
.nav a{
  font-size:14px;color:var(--ink-2);text-decoration:none;padding-bottom:2px;
  border-bottom:1.5px solid transparent
}
.nav a:hover{color:var(--ink);border-bottom-color:var(--rule)}
.nav a[aria-current="page"]{color:var(--ink);border-bottom-color:var(--accent);font-weight:600}

/* ---------- page head ---------- */
.phead{padding:56px 0 34px;border-bottom:1px solid var(--rule);background:var(--paper)}
.kicker{font-family:var(--mono);font-size:11px;letter-spacing:.13em;text-transform:uppercase;color:var(--accent);margin-bottom:12px}
h1{font-family:var(--serif);font-weight:600;font-size:clamp(30px,4.4vw,46px);line-height:1.12;letter-spacing:-.018em;margin:0 0 16px}
.standfirst{font-size:18.5px;line-height:1.6;color:var(--ink-2);max-width:var(--measure);margin:0}
.byline{margin-top:20px;font-family:var(--mono);font-size:11.5px;letter-spacing:.05em;color:var(--muted)}

/* ---------- body copy ---------- */
main{padding:46px 0 72px}
h2{font-family:var(--serif);font-weight:600;font-size:clamp(22px,2.6vw,29px);line-height:1.22;letter-spacing:-.012em;margin:44px 0 14px}
h3{font-size:16.5px;font-weight:700;margin:28px 0 8px;letter-spacing:-.005em}
p{margin:0 0 17px;max-width:var(--measure)}
ul,ol{max-width:var(--measure);padding-left:22px;margin:0 0 18px}
li{margin-bottom:8px}
a{color:var(--accent)}
strong{font-weight:650}
hr{border:0;border-top:1px solid var(--rule);margin:40px 0}

/* ---------- components ---------- */
.card{background:var(--paper);border:1px solid var(--rule);border-radius:4px;padding:24px 26px;margin:26px 0}
.card h3{margin-top:0}
.card p:last-child{margin-bottom:0}

.note{background:var(--warn-soft);border-left:3px solid var(--warn);padding:16px 20px;margin:26px 0;max-width:var(--measure)}
.note p{margin:0;font-size:15.3px;color:#5f4708}
.note strong{color:#4a3706}

.callout{background:var(--accent-soft);border-left:3px solid var(--accent);padding:16px 20px;margin:26px 0;max-width:var(--measure)}
.callout p{margin:0;font-size:15.3px;color:#1d3450}

table{width:100%;border-collapse:collapse;margin:24px 0;font-size:15px;background:var(--paper)}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--rule);vertical-align:top}
th{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:500;background:#fafaf8}
td code{font-family:var(--mono);font-size:13.5px}

.steps{counter-reset:s;list-style:none;padding:0;max-width:var(--measure)}
.steps li{counter-increment:s;position:relative;padding-left:38px;margin-bottom:18px}
.steps li::before{
  content:counter(s);position:absolute;left:0;top:1px;width:24px;height:24px;border-radius:50%;
  background:var(--accent);color:#fff;font-family:var(--mono);font-size:12px;
  display:flex;align-items:center;justify-content:center
}

.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:22px;margin:28px 0}
.tile{background:var(--paper);border:1px solid var(--rule);border-radius:4px;padding:22px;text-decoration:none;color:inherit;display:block;transition:border-color .18s}
.tile:hover{border-color:var(--accent)}
.tile__k{font-family:var(--mono);font-size:10.5px;letter-spacing:.11em;text-transform:uppercase;color:var(--accent);margin-bottom:9px}
.tile__h{font-family:var(--serif);font-size:19px;font-weight:600;margin:0 0 7px;line-height:1.25}
.tile__p{font-size:14.6px;color:var(--ink-2);margin:0;line-height:1.55}

.defs{margin:22px 0;max-width:var(--measure)}
.defs dt{font-weight:700;margin-top:18px}
.defs dd{margin:4px 0 0;color:var(--ink-2)}

.srcs{font-size:14.6px;color:var(--ink-2)}
.srcs li{margin-bottom:11px}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--rule);background:var(--paper);padding:34px 0 44px;margin-top:60px}
.foot{display:flex;justify-content:space-between;gap:22px;flex-wrap:wrap;font-size:13.6px;color:var(--muted)}
.foot__ruo{font-family:var(--mono);font-size:10.5px;letter-spacing:.09em;text-transform:uppercase}

/* ---------- age gate (radio-card style) ---------- */
.gate{position:fixed;inset:0;z-index:9999;display:grid;place-items:center;padding:24px 16px;
  background:rgba(15,23,42,.55);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  transition:opacity .45s ease}
.gate.is-hiding{opacity:0;pointer-events:none}
.gate__card{max-width:440px;width:100%;background:var(--paper);border-radius:22px;
  padding:clamp(24px,5.5vw,36px);box-shadow:0 40px 90px -30px rgba(10,20,36,.6);text-align:center}
.gate__k{font-family:var(--mono);font-size:10.5px;letter-spacing:.13em;text-transform:uppercase;color:var(--accent);margin-bottom:14px}
.gate__h{font-family:var(--sans);font-size:clamp(22px,5vw,28px);font-weight:800;letter-spacing:-.02em;
  line-height:1.12;margin:0 0 10px;color:var(--ink)}
.gate__sub{font-size:14.5px;color:var(--muted);margin:0 0 22px;line-height:1.55}
.gate__q{font-family:var(--sans);font-size:16px;font-weight:700;color:var(--ink);margin-bottom:13px}
.choices{display:flex;flex-direction:column;gap:9px;text-align:left;margin-bottom:20px}
.choice{display:flex;align-items:center;gap:12px;padding:14px 16px;background:#f7f9fc;
  border:1.5px solid var(--rule);border-radius:13px;cursor:pointer;font-size:15px;font-weight:600;
  color:var(--ink-2);transition:border-color .15s,background .15s,color .15s}
.choice input{width:18px;height:18px;margin:0;accent-color:var(--accent);cursor:pointer;flex-shrink:0}
.choice:hover{border-color:var(--accent);background:#fff}
.choice:has(input:checked){border-color:var(--accent);background:var(--accent-soft);color:var(--ink)}
.denied{display:none;background:#fff8f1;border:1px solid #fcd9b6;color:#7a3e00;border-radius:12px;
  padding:15px 17px;font-size:14px;line-height:1.5;text-align:left;margin-bottom:16px}
.denied.is-on{display:block}
.gate__confirm{position:relative;display:flex;align-items:center;justify-content:center;gap:10px;width:100%;
  padding:15px 22px;border-radius:999px;border:0;cursor:pointer;
  background:linear-gradient(135deg,#2c5074,#1a3349);color:#fff;font-family:var(--sans);font-size:16px;
  font-weight:800;box-shadow:0 16px 36px -10px rgba(34,64,92,.4);transition:transform .2s,opacity .2s}
.gate__confirm:hover:not(:disabled){transform:translateY(-1px)}
.gate__confirm:disabled{opacity:.4;cursor:not-allowed;box-shadow:none}
.gate__confirm svg{width:16px;height:16px}
.gate__ruo{margin-top:20px;padding-top:16px;border-top:1px solid var(--rule);font-family:var(--mono);
  font-size:10px;letter-spacing:.05em;color:var(--muted);line-height:1.6}

@media (max-width:720px){
  .masthead__in{flex-direction:column;align-items:flex-start;gap:14px}
  .nav{gap:16px}
  .phead{padding:38px 0 26px}
  main{padding:34px 0 52px}
}


/* ================= v2: hero, figures, texture ================= */

/* subtle paper grain + rule grid behind the masthead area */
.hero{
  position:relative;overflow:hidden;background:#101820;color:#eef1f4;
  border-bottom:1px solid #1d2731
}
.hero::after{
  content:'';position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.028) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.028) 1px,transparent 1px);
  background-size:32px 32px
}
.hero__in{
  position:relative;z-index:2;max-width:var(--wrap);margin:0 auto;padding:76px 24px 68px;
  display:grid;grid-template-columns:1.15fr .85fr;gap:52px;align-items:center
}
.hero__k{font-family:var(--mono);font-size:11px;letter-spacing:.15em;text-transform:uppercase;color:#7fa8cc;margin-bottom:18px}
.hero h1{color:#fff;font-size:clamp(34px,5vw,55px);margin:0 0 20px}
.hero__lede{font-size:19px;line-height:1.6;color:#b9c3cd;max-width:54ch;margin:0 0 26px}
.hero__meta{display:flex;gap:28px;flex-wrap:wrap;font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#8b97a3}
.hero__meta b{display:block;font-family:var(--serif);font-size:25px;letter-spacing:normal;text-transform:none;color:#fff;font-weight:600;margin-bottom:2px}
.hero__art{position:relative}
.hero__art svg{width:100%;height:auto;display:block}

/* figures */
figure{margin:32px 0;max-width:var(--measure)}
figure.wide{max-width:100%}
figure svg{width:100%;height:auto;display:block;background:var(--paper);border:1px solid var(--rule);border-radius:4px}
figcaption{
  margin-top:10px;font-size:13.6px;color:var(--muted);line-height:1.5;
  padding-left:13px;border-left:2px solid var(--rule)
}
figcaption b{color:var(--ink-2);font-weight:650}

/* section rule used above major headings on long pages */
.rule-k{
  display:flex;align-items:center;gap:14px;margin:52px 0 -18px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)
}
.rule-k::after{content:'';flex:1;height:1px;background:var(--rule)}

@media (max-width:860px){
  .hero__in{grid-template-columns:1fr;gap:34px;padding:52px 24px 46px}
  .hero__art{max-width:420px}
}