/* Peptide Format Guide — technical reference site */
:root {
  --surface: #f4f6f8;
  --surface-2: #e9edf1;
  --surface-3: #dde3e9;
  --ink: #0f2229;
  --ink-2: #2c3e47;
  --ink-3: #5b6c75;
  --accent: #1f5f6b;
  --accent-2: #164952;
  --accent-3: #2d8090;
  --highlight: #f4c542;
  --highlight-soft: #fdf3cf;
  --rule: #c8d2da;
  --rule-soft: #dfe5eb;
  --row-stripe: #eef2f6;
  --white: #ffffff;
  --max: 1180px;
  --radius: 4px;
  --mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: "DM Sans", "Manrope", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--surface);
  font-feature-settings: "ss01", "cv11";
}

a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--accent-2); text-decoration-thickness: 2px; }

h1, h2, h3, h4 { font-family: "Manrope", "DM Sans", sans-serif; font-weight: 700; line-height: 1.2; letter-spacing: -0.015em; color: var(--ink); }
h1 { font-size: clamp(2rem, 4.4vw, 3rem); margin: 0 0 1rem; }
h2 { font-size: clamp(1.5rem, 2.6vw, 1.9rem); margin: 2.5rem 0 1rem; }
h3 { font-size: 1.2rem; margin: 1.5rem 0 0.6rem; }
h4 { font-size: 1rem; margin: 1rem 0 0.5rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-2); }

p { margin: 0 0 1rem; }
strong { font-weight: 700; color: var(--ink); }

.container { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }

/* Header */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--rule);
  position: sticky; top: 0; z-index: 50;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.9rem 1.25rem;
  max-width: var(--max); margin: 0 auto;
  gap: 1rem;
}
.brand { display: flex; align-items: center; gap: 0.65rem; text-decoration: none; color: var(--ink); }
.brand:hover { color: var(--ink); }
.brand-logo { width: 36px; height: 36px; color: var(--accent); flex-shrink: 0; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-family: "Manrope", sans-serif; font-weight: 700; font-size: 1.02rem; letter-spacing: -0.01em; }
.brand-tag { font-size: 0.72rem; color: var(--ink-3); letter-spacing: 0.04em; }

.nav { display: flex; gap: 1.4rem; align-items: center; }
.nav a {
  color: var(--ink-2); text-decoration: none; font-size: 0.92rem;
  font-weight: 500;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}
.nav a:hover { color: var(--accent); border-bottom-color: var(--accent); }

@media (max-width: 720px) {
  .nav { gap: 0.85rem; }
  .nav a { font-size: 0.85rem; }
  .brand-tag { display: none; }
}

/* Hero */
.hero {
  background:
    radial-gradient(circle at 80% 10%, rgba(244,197,66,0.12), transparent 50%),
    radial-gradient(circle at 10% 90%, rgba(31,95,107,0.08), transparent 60%),
    var(--surface);
  padding: 4rem 0 3.5rem;
  border-bottom: 1px solid var(--rule);
  position: relative;
  overflow: hidden;
}
.hero-grid-bg {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--rule-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule-soft) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.5;
  pointer-events: none;
  mask-image: radial-gradient(circle at 50% 50%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(circle at 50% 50%, black 30%, transparent 75%);
}
.hero-inner { position: relative; }
.eyebrow {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--white);
  border: 1px solid var(--accent);
  padding: 0.3rem 0.7rem;
  border-radius: 2px;
  margin-bottom: 1.25rem;
}
.hero h1 { max-width: 820px; margin-bottom: 1.2rem; }
.hero-sub { font-size: 1.1rem; color: var(--ink-2); max-width: 680px; margin-bottom: 1.75rem; }
.hero-meta {
  display: flex; flex-wrap: wrap; gap: 1.5rem;
  font-family: var(--mono); font-size: 0.82rem; color: var(--ink-3);
  border-top: 1px solid var(--rule);
  padding-top: 1.2rem;
}
.hero-meta span strong { color: var(--ink); font-weight: 700; }

/* Section */
section { padding: 3rem 0; }
.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 1.75rem; gap: 1rem; flex-wrap: wrap;
}
.section-head h2 { margin: 0; }
.section-label {
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--accent);
}

/* Reference cards (home) */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}
.ref-card {
  background: var(--white);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex; flex-direction: column;
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.2s, transform 0.2s;
  position: relative;
}
.ref-card:hover { border-color: var(--accent); color: var(--ink); transform: translateY(-2px); }
.ref-card .cat {
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--accent);
  border-left: 3px solid var(--highlight); padding-left: 0.6rem;
  margin-bottom: 0.85rem;
}
.ref-card h3 { font-size: 1.18rem; margin: 0 0 0.6rem; }
.ref-card p { font-size: 0.94rem; color: var(--ink-3); margin-bottom: 1rem; }
.ref-card .read {
  margin-top: auto;
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.06em;
  color: var(--accent); font-weight: 500;
}
.ref-card .read::after { content: " →"; }

/* Teaser blocks */
.teaser-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem;
}
@media (max-width: 720px) { .teaser-grid { grid-template-columns: 1fr; } }
.teaser {
  background: var(--white); border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1.75rem;
}
.teaser h3 { margin-top: 0; }
.teaser .more { display: inline-block; margin-top: 0.5rem; font-weight: 600; }

/* Article */
.article-page { background: var(--white); }
article.entry { padding: 2.5rem 0 3rem; }
.breadcrumbs {
  font-family: var(--mono); font-size: 0.78rem;
  color: var(--ink-3); margin-bottom: 1.25rem;
  letter-spacing: 0.04em;
}
.breadcrumbs a { color: var(--ink-3); }
.breadcrumbs a:hover { color: var(--accent); }
.article-meta {
  font-family: var(--mono); font-size: 0.8rem; color: var(--ink-3);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 0.8rem 0;
  margin: 1.25rem 0 2rem;
  display: flex; flex-wrap: wrap; gap: 1.25rem;
}
.article-meta strong { color: var(--ink); }

/* BLUF block (top callout) */
.bluf {
  background: var(--accent);
  color: #f6fbfc;
  padding: 1.5rem 1.6rem;
  border-radius: var(--radius);
  font-size: 1.02rem;
  line-height: 1.6;
  margin-bottom: 2rem;
  border-left: 6px solid var(--highlight);
}
.bluf a { color: var(--highlight); text-decoration: underline; }
.bluf a:hover { color: #fff; }
.bluf strong { color: #fff; }

/* Info box (key facts) — distinctive technical reference feature */
.info-box {
  background: var(--highlight-soft);
  border: 1px solid var(--highlight);
  border-left: 6px solid var(--highlight);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 2rem;
}
.info-box h4 {
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.14em;
  margin: 0 0 1rem; color: var(--ink); text-transform: uppercase;
}
.info-box-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 1rem;
}
.info-box-item {
  border-left: 2px solid var(--accent);
  padding-left: 0.85rem;
}
.info-box-item .label {
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--ink-3);
  display: block; margin-bottom: 0.25rem;
}
.info-box-item .value {
  font-weight: 600; color: var(--ink); font-size: 0.95rem;
  display: block; line-height: 1.35;
}

/* Tables */
.table-wrap { overflow-x: auto; margin: 1.5rem 0; border: 1px solid var(--rule); border-radius: var(--radius); background: var(--white); }
table {
  width: 100%; border-collapse: collapse;
  font-size: 0.9rem;
  min-width: 640px;
}
.comparison-table th, .comparison-table td,
table.vendor-table th, table.vendor-table td { padding: 0.7rem 0.85rem; text-align: left; border-bottom: 1px solid var(--rule-soft); }
.comparison-table thead th, table.vendor-table thead th {
  background: var(--accent); color: #f6fbfc;
  font-weight: 600; font-size: 0.78rem;
  letter-spacing: 0.06em; text-transform: uppercase;
  border-bottom: 1px solid var(--accent-2);
}
.comparison-table tbody tr:nth-child(even),
table.vendor-table tbody tr:nth-child(even) { background: var(--row-stripe); }
.comparison-table tbody tr:hover,
table.vendor-table tbody tr:hover { background: var(--surface-2); }
.comparison-table td:first-child { font-weight: 700; color: var(--accent); }

/* Vendor entries */
.vendor-entry {
  border-top: 2px solid var(--rule);
  padding-top: 1.75rem;
  margin-top: 2.5rem;
}
.vendor-entry:first-of-type { border-top: none; padding-top: 0; }
.vendor-entry .vendor-meta {
  font-family: var(--mono); font-size: 0.82rem;
  color: var(--accent); font-weight: 500;
  margin-bottom: 1rem; line-height: 1.5;
}
.vendor-entry h2 { margin-top: 0; }
.vendor-entry ul { padding-left: 1.25rem; }
.vendor-entry ul li { margin-bottom: 0.35rem; }

/* FAQ accordions */
.faq { margin-top: 1rem; }
details {
  background: var(--white);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  margin-bottom: 0.6rem;
  overflow: hidden;
}
details summary {
  cursor: pointer;
  padding: 1rem 1.2rem;
  font-weight: 600;
  font-size: 1rem;
  color: var(--ink);
  list-style: none;
  display: flex; justify-content: space-between; align-items: center;
  gap: 1rem;
}
details summary::-webkit-details-marker { display: none; }
details summary::after {
  content: "+";
  font-family: var(--mono);
  font-size: 1.4rem;
  color: var(--accent);
  font-weight: 400;
  transition: transform 0.2s;
}
details[open] summary::after { content: "−"; }
details[open] summary { border-bottom: 1px solid var(--rule); background: var(--surface-2); }
details .faq-answer { padding: 1rem 1.2rem 1.25rem; color: var(--ink-2); }
details .faq-answer p:last-child { margin-bottom: 0; }

/* Related articles */
.related {
  margin-top: 3rem;
  padding: 2rem 0;
  border-top: 1px solid var(--rule);
}
.related h3 { margin-top: 0; }
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}
.related-card {
  background: var(--surface-2);
  border-radius: var(--radius);
  padding: 1.1rem;
  text-decoration: none;
  color: var(--ink);
  border: 1px solid var(--rule);
}
.related-card:hover { border-color: var(--accent); color: var(--ink); }
.related-card .cat {
  font-family: var(--mono); font-size: 0.7rem;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 0.5rem;
}
.related-card .title { font-weight: 600; font-size: 0.95rem; line-height: 1.35; }

/* Article body — content tweaks */
.entry-body h2 {
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.4rem;
}

/* Article disclaimer */
.disclaimer {
  margin-top: 2.5rem;
  padding: 1rem 1.25rem;
  background: var(--surface-2);
  border-left: 3px solid var(--accent);
  font-size: 0.85rem;
  color: var(--ink-3);
  font-style: italic;
}

/* Static / utility pages */
.prose { max-width: 720px; margin: 0 auto; padding: 2.5rem 0; }
.prose h1 { margin-top: 0; }
.prose ul, .prose ol { padding-left: 1.4rem; }
.prose li { margin-bottom: 0.4rem; }

/* Footer */
.site-footer {
  background: var(--ink);
  color: #c9d3da;
  padding: 3rem 0 2rem;
  margin-top: 4rem;
}
.site-footer .footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
}
@media (max-width: 720px) { .site-footer .footer-grid { grid-template-columns: 1fr; } }
.site-footer h4 {
  color: #f5f7f9; font-family: "Manrope", sans-serif;
  font-size: 0.8rem; letter-spacing: 0.1em; text-transform: uppercase;
  margin: 0 0 0.85rem;
}
.site-footer a { color: #c9d3da; text-decoration: none; display: block; padding: 0.2rem 0; font-size: 0.92rem; }
.site-footer a:hover { color: var(--highlight); }
.site-footer .footer-brand p { margin: 0.6rem 0 0; font-size: 0.88rem; max-width: 32ch; }
.site-footer .footer-bottom {
  border-top: 1px solid #2a3d46;
  margin-top: 2rem; padding-top: 1.2rem;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem;
  font-size: 0.8rem; color: #8a9aa3;
}
.site-footer .footer-bottom em { color: var(--highlight); font-style: normal; }