:root {
  --bg: #f5f2ea;
  --surface: rgba(255, 252, 247, 0.88);
  --surface-strong: #fffdf9;
  --surface-dark: #0f2e24;
  --text: #1e241f;
  --muted: #536157;
  --line: rgba(25, 42, 32, 0.12);
  --brand: #0e3b2e;
  --brand-2: #c96c2d;
  --shadow: 0 20px 50px rgba(15, 46, 36, 0.08);
  --radius: 22px;
  --wrap: min(1180px, calc(100vw - 2rem));
  --font-head: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --font-body: "Segoe UI", "Trebuchet MS", Verdana, sans-serif;
}
*,*::before,*::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(201, 108, 45, 0.14), transparent 28rem),
    radial-gradient(circle at top right, rgba(14, 59, 46, 0.16), transparent 24rem),
    linear-gradient(180deg, #f7f4ec 0%, #f0ebdf 100%);
  line-height: 1.6;
}
.wrap { width: var(--wrap); margin: 0 auto; }
a { color: inherit; }
.skip-link {
  position: absolute; left: 1rem; top: -3rem; background: var(--brand); color: #fff;
  padding: 0.75rem 1rem; border-radius: 0 0 12px 12px; z-index: 10;
}
.skip-link:focus { top: 0; }
.site-header {
  position: sticky; top: 0; z-index: 5; backdrop-filter: blur(12px);
  background: rgba(247, 244, 236, 0.82); border-bottom: 1px solid var(--line);
}
.site-header .wrap,.footer-grid,.hero-grid,.faq-grid { display: grid; gap: 1.5rem; }
.site-header .wrap { grid-template-columns: 1fr auto; align-items: center; padding: 1rem 0; }
.brand-lockup { display: flex; flex-direction: column; gap: 0.2rem; }
.brand {
  font-family: var(--font-head); font-size: clamp(1.5rem, 2vw, 2rem); font-weight: 700;
  color: var(--brand); text-decoration: none;
}
.eyebrow {
  margin: 0; color: var(--brand-2); text-transform: uppercase; letter-spacing: 0.16em;
  font-size: 0.72rem; font-weight: 700;
}
.site-nav { display: flex; flex-wrap: wrap; gap: 1rem; }
.site-nav a { text-decoration: none; color: var(--muted); font-weight: 600; }
.hero,.section,.site-footer { padding: 4.5rem 0; }
.section-top-tight { padding-top: 2rem; }
.section-tight-bottom { padding-bottom: 2.75rem; }
.hero { display: none; }
.page-intro {
  display: grid;
  gap: 0.9rem;
  margin-bottom: 1.75rem;
}
.page-intro h1 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(2rem, 4vw, 3.35rem);
  line-height: 1.06;
  max-width: none;
}
.topic-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.topic-links a {
  padding: 0.65rem 0.9rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(25, 42, 32, 0.1);
  text-decoration: none;
  font-weight: 700;
  color: var(--brand);
}
.hero-grid { grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.9fr); align-items: start; }
.hero-copy h1,.section-heading h2,.guide-card h3,.mini-card h3,.converter-card h3,.hero-panel h2,.site-footer h2,.faq-grid h2 {
  font-family: var(--font-head); line-height: 1.08; margin: 0 0 0.8rem;
}
.hero-copy h1 { font-size: clamp(2.5rem, 6vw, 4.8rem); max-width: 12ch; }
.hero-text,.section-heading p,.prose p { max-width: 72ch; color: var(--muted); }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin: 1.75rem 0; }
.button {
  display: inline-flex; align-items: center; justify-content: center; min-height: 3rem;
  padding: 0.85rem 1.25rem; border-radius: 999px; background: var(--brand); color: #fff;
  text-decoration: none; font-weight: 700; box-shadow: var(--shadow);
}
.button-secondary { background: transparent; color: var(--brand); border: 1px solid rgba(14,59,46,0.18); }
.hero-panel,.converter-card,.mini-card,.guide-card,.download-card,.faq-list details {
  background: var(--surface); border: 1px solid rgba(25,42,32,0.08); border-radius: var(--radius); box-shadow: var(--shadow);
}
.hero-panel,.converter-card,.mini-card,.guide-card,.download-card { padding: 1.2rem; }
.featured-links,.hero-stats,.site-footer ul { list-style: none; padding: 0; margin: 0; }
.featured-links li + li,.site-footer li + li { margin-top: 0.7rem; }
.featured-links a,.site-footer a,.download-card { text-decoration: none; }
.hero-stats { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-stats li {
  min-width: 8rem; padding: 1rem; border-radius: 18px; background: rgba(255,255,255,0.54);
  border: 1px solid rgba(25,42,32,0.08);
}
.hero-stats strong { display: block; font-size: 1.2rem; color: var(--brand); }
.section-heading { margin-bottom: 1.75rem; }
.converters-intro {
  margin: 0;
  max-width: none;
  color: var(--muted);
  font-size: 1.02rem;
}
#converters {
  padding-top: 2rem;
}
.accent {
  background: linear-gradient(180deg, rgba(215,193,149,0.18), rgba(215,193,149,0.04)), rgba(255,255,255,0.24);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.converter-grid,.guide-grid,.downloads-grid,.popular-grid { display: grid; gap: 1.1rem; }
.converter-grid { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.popular-grid,.downloads-grid { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.guide-grid { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.converter-card p,.guide-card p,.mini-card p,.download-card span,.status { color: var(--muted); }
.converter-form,.bmi-grid { display: grid; gap: 0.85rem; }
.input-row { display: grid; gap: 0.65rem; grid-template-columns: 1fr auto 1fr; align-items: end; }
.field,.bmi-row { display: grid; gap: 0.35rem; }
label,.fieldset-label { font-weight: 700; font-size: 0.94rem; }
input,select {
  width: 100%; min-height: 2.9rem; padding: 0.75rem 0.85rem; border-radius: 14px;
  border: 1px solid rgba(25,42,32,0.18); background: var(--surface-strong); font: inherit; color: var(--text);
}
input:focus,select:focus,summary:focus { outline: 2px solid rgba(201,108,45,0.4); outline-offset: 2px; }
.swap-button {
  min-height: 2.9rem; border: 0; border-radius: 14px; background: rgba(14,59,46,0.08);
  color: var(--brand); font: inherit; font-weight: 700; cursor: pointer; align-self: end;
}
.result-box { padding: 0.95rem 1rem; border-radius: 16px; background: #fff; border: 1px solid rgba(25,42,32,0.1); }
.result-box strong { display: block; color: var(--brand); font-size: 1.15rem; }
.formula { margin: 0.85rem 0 0; font-size: 0.92rem; }
.download-card { display: grid; gap: 0.35rem; transition: transform 160ms ease, background 160ms ease; }
.download-card:hover,.download-card:focus-visible { transform: translateY(-2px); background: #fff; }
.faq-grid { grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); }
.faq-list { display: grid; gap: 0.8rem; }
.faq-list details { padding: 1rem 1.15rem; }
.faq-list summary { cursor: pointer; font-weight: 700; }
main.section {
  padding-top: 2rem;
}
.article-shell {
  width: var(--wrap);
  margin: 0 auto;
}
.article-hero {
  padding: 1rem 0 1.5rem;
}
.blog-hero {
  background: rgba(255,255,255,0.38);
  border: 1px solid rgba(25, 42, 32, 0.08);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.article-hero h1 {
  margin: 0.35rem 0 1rem;
  font-family: var(--font-head);
  font-size: clamp(2.1rem, 4.5vw, 4rem);
  line-height: 1.05;
}
.article-meta,
.article-note,
.article-list,
.article-links {
  color: var(--muted);
}
.article-card,
.toc-card {
  background: var(--surface);
  border: 1px solid rgba(25, 42, 32, 0.08);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}
.toc-card ul,
.article-list,
.article-links {
  margin: 0;
  padding-left: 1.1rem;
}
.article-layout,
.article-content {
  display: grid;
  gap: 1.5rem;
}
.article-layout {
  grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
  align-items: start;
}
.article-content section,
.article-summary,
.article-cta {
  background: rgba(255,255,255,0.45);
  border: 1px solid rgba(25, 42, 32, 0.08);
  border-radius: var(--radius);
  padding: 1.4rem;
}
.article-content h2,
.article-content h3,
.article-summary h2,
.article-cta h2 {
  margin: 0 0 0.8rem;
  font-family: var(--font-head);
  line-height: 1.1;
}
.article-content p,
.article-summary p,
.article-cta p {
  margin: 0 0 1rem;
}
.article-content p:last-child,
.article-summary p:last-child,
.article-cta p:last-child {
  margin-bottom: 0;
}
.article-kicker {
  display: inline-block;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: rgba(201, 108, 45, 0.14);
  color: var(--brand-2);
  font-weight: 700;
  font-size: 0.8rem;
}
.blog-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  align-items: start;
}
.blog-card {
  display: grid;
  gap: 0.65rem;
  align-content: start;
  text-decoration: none;
  background: var(--surface);
  border: 1px solid rgba(25, 42, 32, 0.08);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.2rem;
  transition: transform 160ms ease, background 160ms ease;
}
.blog-card strong {
  display: block;
  font-family: var(--font-head);
  line-height: 1.1;
}
.blog-card span {
  display: block;
  color: var(--muted);
  line-height: 1.5;
}
.blog-card:hover,
.blog-card:focus-visible {
  transform: translateY(-2px);
  background: #fff;
}
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  color: var(--muted);
  font-size: 0.95rem;
}
.breadcrumb a {
  text-decoration: none;
}
.site-footer { background: var(--surface-dark); color: rgba(255,255,255,0.82); }
.footer-grid { grid-template-columns: 1.2fr 0.8fr 0.8fr; }
.footer-brand,.site-footer h2,.site-footer a { color: #fff; }
.site-footer h2 { font-size: 1rem; }
.site-footer ul { color: rgba(255,255,255,0.72); }
@media (max-width: 920px) {
  .site-header .wrap,.hero-grid,.faq-grid,.footer-grid { grid-template-columns: 1fr; }
  .hero,.section,.site-footer { padding: 3.5rem 0; }
  #converters { padding-top: 1.5rem; }
  .page-intro h1 { max-width: 100%; }
  main.section { padding-top: 1.5rem; }
  .article-shell { width: min(100vw - 1rem, 1180px); }
  .article-layout { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .wrap { width: min(100vw - 1rem, 1180px); }
  .hero-copy h1 { max-width: 100%; }
  .hero-stats { display: grid; grid-template-columns: repeat(3, 1fr); }
  .input-row { grid-template-columns: 1fr; }
  .topic-links a { width: 100%; text-align: center; }
}