:root {
  /* Palette taken from the Peptide Explainer logo: navy, blue, teal and orange */
  --bg: #f5f7fa;
  --surface: #ffffff;
  --ink: #0c2c4e;
  --ink-2: #2a4462;
  --muted: #586779;
  --line: #e0e6ed;
  --accent: #1a6db3;
  --accent-ink: #12508a;
  --accent-soft: #e6f0fa;
  --teal: #2f8c9c;
  --gold: #e8772e;
  --gold-ink: #a14710;
  --gold-soft: #fdeee3;
  --green: #1d7148;
  --green-soft: #e2f3ea;
  --amber: #9a5b0b;
  --amber-soft: #fbf0dd;
  --blue: #2f5f87;
  --blue-soft: #e4edf5;
  --gray-soft: #edf1f5;
  --shadow: 0 1px 2px rgba(12,44,78,.05), 0 8px 24px rgba(12,44,78,.07);
  --radius: 16px;
  --serif: "Fraunces", Georgia, serif;
  --sans: "Inter", system-ui, -apple-system, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 18px/1.65 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-underline-offset: 3px; }
h1, h2, h3 { font-family: var(--serif); font-weight: 500; letter-spacing: -0.015em; line-height: 1.15; margin: 0 0 .5em; }
h1 { font-size: clamp(2.3rem, 5.5vw, 3.9rem); }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); }
h3 { font-size: 1.3rem; }
p { margin: 0 0 1em; }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.eyebrow { font: 600 .78rem/1 var(--sans); letter-spacing: .14em; text-transform: uppercase; color: var(--accent); margin-bottom: 16px; display: block; }
.lead { font-size: 1.2rem; color: var(--ink-2); max-width: 640px; }
.muted { color: var(--muted); }

/* Header */
header.site { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.88); backdrop-filter: saturate(1.4) blur(12px); border-bottom: 1px solid var(--line); }
.nav { display: flex; align-items: center; gap: 28px; height: 88px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); margin-right: auto; }
.brand-mark { width: 36px; height: 36px; border-radius: 10px; background: var(--ink); display: grid; place-items: center; }
.brand-name { font: 500 1.2rem/1.1 var(--serif); }
.brand-domain { display: block; font: 500 .72rem/1.2 var(--sans); color: var(--muted); letter-spacing: .04em; }
.nav-links { display: flex; gap: 4px; }
.nav-links a { text-decoration: none; color: var(--ink-2); font-size: .95rem; font-weight: 500; padding: 8px 12px; border-radius: 8px; }
.nav-links a:hover, .nav-links a.active { color: var(--ink); background: var(--gray-soft); }
.btn { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; font: 600 1rem/1 var(--sans); padding: 15px 22px; border-radius: 12px; border: 1px solid transparent; cursor: pointer; transition: transform .15s, background .15s; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-ink); }
.btn-ghost { background: var(--surface); color: var(--ink); border-color: var(--line); }
.btn-sm { padding: 11px 16px; font-size: .92rem; }
.menu-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 10px; width: 44px; height: 44px; cursor: pointer; }
@media (max-width: 900px) {
  .nav-links, .nav .btn { display: none; }
  .menu-toggle { display: grid; place-items: center; }
  .nav-links.open { display: flex; flex-direction: column; position: absolute; top: 72px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--line); padding: 12px 16px 20px; }
  .nav-links.open a { padding: 14px 12px; font-size: 1.05rem; }
}

/* Sections */
section { padding: 88px 0; }
.hero { padding: 96px 0 72px; position: relative; overflow: hidden; }
.hero::before { content: ""; position: absolute; inset: -40% -10% auto auto; width: 720px; height: 720px; background: radial-gradient(closest-side, rgba(26,109,179,.12), transparent 70%); pointer-events: none; }
.hero-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 56px; align-items: center; }
.hero h1 em { font-style: italic; color: var(--accent); }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }
.hero-panel { background: var(--surface); border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow); padding: 28px; }
.hero-panel .row { display: flex; justify-content: space-between; padding: 14px 0; border-bottom: 1px solid var(--line); font-size: .98rem; }
.hero-panel .row:last-child { border-bottom: 0; }
.trust { display: flex; gap: 28px; flex-wrap: wrap; margin-top: 40px; color: var(--muted); font-size: .92rem; }
.trust span::before { content: "✓"; color: var(--accent); font-weight: 700; margin-right: 8px; }
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; } .hero { padding: 56px 0 48px; } section { padding: 64px 0; } }

.section-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 36px; flex-wrap: wrap; }
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fill, minmax(420px, 1fr)); }
@media (max-width: 500px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
a.card { display: block; text-decoration: none; color: inherit; transition: transform .2s, border-color .2s; }
a.card:hover { transform: translateY(-3px); border-color: #c4d2e0; }
.card h3 { margin-top: 14px; }
.card p { color: var(--muted); font-size: 1rem; }
.card .more { font-weight: 600; font-size: .95rem; color: var(--accent); }

.badge { display: inline-block; font: 600 .74rem/1 var(--sans); letter-spacing: .04em; padding: 7px 10px; border-radius: 999px; }
.b-approved { background: var(--green-soft); color: var(--green); }
.b-intl { background: var(--blue-soft); color: var(--blue); }
.b-invest { background: var(--amber-soft); color: var(--amber); }
.b-pre { background: var(--gray-soft); color: var(--ink-2); }
.tag { font-size: .8rem; color: var(--muted); margin-left: 8px; }

.band { background: var(--ink); color: #e6edf4; }
.band h2 { color: #fff; }
.band .muted { color: #a6b6c8; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; counter-reset: s; }
.steps div { counter-increment: s; border-top: 1px solid rgba(255,255,255,.18); padding-top: 20px; }
.steps div::before { content: "0" counter(s); font: 500 1rem var(--serif); color: var(--gold); display: block; margin-bottom: 10px; }
.steps h3 { color: #fff; }
@media (max-width: 800px) { .steps { grid-template-columns: 1fr; } }

/* Library */
.filters { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 28px; }
.chip { border: 1px solid var(--line); background: var(--surface); padding: 10px 16px; border-radius: 999px; font: 500 .95rem var(--sans); cursor: pointer; color: var(--ink-2); }
.chip.active { background: var(--ink); color: #fff; border-color: var(--ink); }
.legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: .9rem; color: var(--muted); margin-bottom: 24px; }

/* Compound page */
.crumbs { font-size: .92rem; color: var(--muted); margin-bottom: 20px; }
.crumbs a { color: var(--muted); }
.detail { display: grid; grid-template-columns: 1fr 340px; gap: 48px; align-items: start; }
.detail aside { position: sticky; top: 112px; }
.facts dt { font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin-top: 16px; }
.facts dd { margin: 4px 0 0; font-weight: 500; }
.prose h2 { font-size: 1.6rem; margin-top: 44px; }
.prose ul { padding-left: 1.2em; } .prose li { margin-bottom: .5em; }
.callout { border-left: 3px solid var(--gold); background: var(--gold-soft); padding: 18px 22px; border-radius: 0 12px 12px 0; font-size: 1rem; margin: 24px 0; }
@media (max-width: 900px) { .detail { grid-template-columns: 1fr; } .detail aside { position: static; } }

table { width: 100%; border-collapse: collapse; font-size: .98rem; background: var(--surface); }
th, td { text-align: left; padding: 14px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); font-weight: 600; background: #f8fafc; }
.table-wrap { border: 1px solid var(--line); border-radius: var(--radius); overflow-x: auto; box-shadow: var(--shadow); }

/* Calculator */
.calc { display: grid; grid-template-columns: 1fr 1.1fr; gap: 24px; }
@media (max-width: 900px) { .calc { grid-template-columns: 1fr; } }
label { display: block; font-weight: 600; font-size: .95rem; margin-bottom: 8px; }
.field { margin-bottom: 22px; }
.input { display: flex; align-items: center; border: 1px solid var(--line); border-radius: 12px; background: #fff; overflow: hidden; }
.input:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.input input, .input select { flex: 1; border: 0; padding: 15px 16px; font: 500 1.1rem var(--sans); color: var(--ink); background: transparent; min-width: 0; outline: none; }
.input span { padding: 0 16px; color: var(--muted); font-weight: 500; }
.unit-toggle { display: flex; gap: 2px; margin-right: 6px; padding: 3px; background: var(--gray-soft); border-radius: 9px; }
.unit-toggle button { border: 0; background: transparent; padding: 8px 12px; border-radius: 7px; font: 600 .9rem var(--sans); color: var(--muted); cursor: pointer; }
.unit-toggle button.active { background: #fff; color: var(--ink); box-shadow: 0 1px 2px rgba(14,27,38,.12); }
.presets { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.presets button { border: 1px solid var(--line); background: var(--bg); border-radius: 8px; padding: 6px 10px; font: 500 .85rem var(--sans); cursor: pointer; }
.result-big { font: 500 3.4rem/1 var(--serif); color: var(--accent); }
.results { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; margin-top: 24px; }
.results div { background: #fff; padding: 16px 18px; }
.results small { display: block; color: var(--muted); font-size: .82rem; }
.results strong { font-size: 1.2rem; font-weight: 600; }
.warn { margin-top: 16px; padding: 14px 16px; border-radius: 10px; background: var(--amber-soft); color: var(--amber); font-size: .95rem; display: none; }

/* Partners */
.disclosure { background: var(--blue-soft); color: #1d466f; border-radius: 12px; padding: 16px 20px; font-size: .95rem; margin-bottom: 32px; }
.partner-logo { width: 52px; height: 52px; border-radius: 12px; background: var(--ink); color: #fff; display: grid; place-items: center; font: 500 1.3rem var(--serif); }
.checks { list-style: none; padding: 0; margin: 16px 0 24px; }
.checks li { padding: 6px 0 6px 28px; position: relative; font-size: .98rem; color: var(--ink-2); }
.checks li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }

.nl-card { display: grid; grid-template-columns: 1.2fr 1fr; gap: 32px; align-items: center; padding: 40px; background: var(--accent-soft); border-color: #c9dcef; }
@media (max-width: 800px) { .nl-card { grid-template-columns: 1fr; padding: 28px; } }
footer { background: var(--ink); color: #a6b6c8; padding: 64px 0 40px; font-size: .95rem; }
footer h4 { color: #fff; font: 500 1.1rem var(--serif); margin: 0 0 12px; }
footer a { color: #d6e1ec; text-decoration: none; display: block; padding: 4px 0; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; }
.fine { border-top: 1px solid rgba(255,255,255,.12); margin-top: 40px; padding-top: 24px; font-size: .85rem; line-height: 1.6; }
@media (max-width: 800px) { .foot-grid { grid-template-columns: 1fr; } }
.view { animation: fade .35s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* Dosing protocol pages */
.toc { display: flex; flex-wrap: wrap; gap: 6px 18px; align-items: center; padding: 16px 20px; margin: 28px 0 8px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; font-size: .92rem; }
.toc strong { font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin-right: 4px; }
.toc a { text-decoration: none; font-weight: 500; }
.quick-card { margin: 16px 0 8px; }
.quick-controls { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 10px; }
.quick-controls.three label:last-child { grid-column: 1 / -1; }
.quick-controls label { margin: 0; }
.quick-controls .input { margin-top: 8px; }
.quick-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.quick-grid div { background: #f8fafc; padding: 14px 16px; }
.quick-grid small { display: block; color: var(--muted); font-size: .78rem; }
.quick-grid strong { font-size: 1.05rem; }
.protocol-card { margin: 20px 0; }
.protocol-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 6px; }
.protocol-head h3 { margin: 0; }
.supplies { margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--line); font-size: .95rem; }
.supplies .checks { margin: 8px 0 0; }
.over { display: inline-block; font-size: .72rem; font-weight: 600; color: var(--amber); background: var(--amber-soft); padding: 2px 6px; border-radius: 6px; }
.refs li { margin-bottom: .7em; font-size: .98rem; }
.related { display: flex; flex-wrap: wrap; gap: 10px; }
.related a { text-decoration: none; font-weight: 600; padding: 10px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
@media (max-width: 700px) { .quick-grid { grid-template-columns: 1fr 1fr; } .quick-controls { grid-template-columns: 1fr; } }

.detail > * { min-width: 0; }

/* Amazon storefront */
.store-item { display: flex; flex-direction: column; }
.store-item p { font-size: .98rem; }
.amazon-btn { align-self: flex-start; font: 600 .92rem var(--sans); color: #fff; background: var(--ink); padding: 11px 16px; border-radius: 10px; }
.store-item:hover .amazon-btn { background: var(--accent); }
.bundles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: stretch; }
.bundle { display: flex; flex-direction: column; position: relative; }
.bundle.featured { border: 2px solid var(--accent); }
.bundle-badge { position: absolute; top: -12px; right: 20px; }
.bundle-list { list-style: none; padding: 0; margin: 8px 0 20px; }
.bundle-list li { border-top: 1px solid var(--line); }
.bundle-list a { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; text-decoration: none; color: var(--ink); font-size: .98rem; }
.bundle-list a span { color: var(--accent); font-weight: 600; font-size: .88rem; white-space: nowrap; }
.bundle-list a:hover { color: var(--accent); }
@media (max-width: 900px) { .bundles { grid-template-columns: 1fr; } }

/* Logo in header */
.brand img { display: block; height: 64px; width: auto; }
@media (max-width: 900px) { .nav { height: 76px; } .nav-links.open { top: 76px; } .brand img { height: 54px; } }
@media (max-width: 400px) { .brand img { height: 48px; } }