:root {
  --bg: #f3f1ec;
  --bg-accent: #e7eef2;
  --ink: #1c2430;
  --muted: #5c6b7a;
  --brand: #0f4c5c;
  --brand-2: #1b6b7a;
  --line: #d5dde3;
  --card: #ffffff;
  --ok: #0f6b4c;
  --warn: #9a5b00;
  --danger: #8b2e2e;
  --font: "Source Serif 4", "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  --sans: "DM Sans", "Segoe UI", sans-serif;
  --max: 720px;
  --wide: 980px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  background:
    radial-gradient(1200px 500px at 10% -10%, #d9ebea 0%, transparent 55%),
    radial-gradient(900px 400px at 100% 0%, #e8e0d4 0%, transparent 50%),
    var(--bg);
  line-height: 1.55;
  min-height: 100vh;
}

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

.wrap { width: min(100% - 2rem, var(--wide)); margin-inline: auto; }
.wrap-narrow { width: min(100% - 2rem, var(--max)); margin-inline: auto; }

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,0.75);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}
.site-header .bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}
.brand {
  font-family: var(--font);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--brand);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.nav { display: flex; flex-wrap: wrap; gap: 0.85rem 1.1rem; font-size: 0.92rem; }
.nav a { color: var(--ink); text-decoration: none; }
.nav a:hover { color: var(--brand); }

.hero {
  padding: 3.5rem 0 2.5rem;
}
.hero h1 {
  font-family: var(--font);
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.1;
  margin: 0 0 0.75rem;
  letter-spacing: -0.03em;
  color: var(--brand);
}
.hero .tagline {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 36rem;
  margin: 0 0 1.75rem;
}

.grid-tools {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.85rem;
}
.tool-link, .cat-link {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1rem 1.1rem;
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.15s, transform 0.15s;
}
.tool-link:hover, .cat-link:hover {
  border-color: var(--brand);
  transform: translateY(-1px);
}
.tool-link strong, .cat-link strong { display: block; margin-bottom: 0.25rem; color: var(--brand); }
.tool-link span, .cat-link span { font-size: 0.88rem; color: var(--muted); }

.section { padding: 1.5rem 0 2.5rem; }
.section h2 {
  font-family: var(--font);
  font-size: 1.45rem;
  margin: 0 0 1rem;
}

.breadcrumb { font-size: 0.85rem; color: var(--muted); margin: 1.25rem 0 0.75rem; }
.breadcrumb a { color: var(--muted); }

.page-title {
  font-family: var(--font);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.15;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}
.lede { color: var(--muted); margin: 0 0 1.25rem; }

.calc-panel {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem 1rem;
}
@media (max-width: 640px) {
  .calc-grid { grid-template-columns: 1fr; }
  .nav { display: none; }
  .nav.open { display: flex; flex-direction: column; position: absolute; right: 1rem; top: 3.2rem; background: #fff; border: 1px solid var(--line); padding: 0.75rem 1rem; }
  .nav-toggle { display: inline-block; }
}
.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: #fff;
  padding: 0.35rem 0.6rem;
  font: inherit;
  cursor: pointer;
}
label { display: block; font-size: 0.82rem; color: var(--muted); margin-bottom: 0.25rem; }
input[type="number"], input[type="text"], select {
  width: 100%;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--line);
  font: inherit;
  background: #fff;
}
.full { grid-column: 1 / -1; }
.check {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.92rem;
  margin-top: 0.35rem;
}
.check input { width: auto; }
.btn {
  appearance: none;
  border: 0;
  background: var(--brand);
  color: #fff;
  font: inherit;
  font-weight: 600;
  padding: 0.7rem 1.1rem;
  cursor: pointer;
  margin-top: 0.5rem;
}
.btn:hover { background: var(--brand-2); }

.results {
  background: linear-gradient(180deg, #f7fbfb, #fff);
  border: 1px solid var(--line);
  padding: 1.15rem 1.25rem;
  margin-bottom: 1.25rem;
}
.results h2 { margin-top: 0; font-family: var(--font); font-size: 1.2rem; }
.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
  margin: 0.75rem 0;
}
.metric {
  background: #fff;
  border: 1px solid var(--line);
  padding: 0.75rem;
}
.metric .label { font-size: 0.78rem; color: var(--muted); }
.metric .value { font-size: 1.25rem; font-weight: 700; color: var(--brand); font-variant-numeric: tabular-nums; }
.note-ok { color: var(--ok); }
.note-warn { color: var(--warn); }
.note-danger { color: var(--danger); }

.content-block { margin: 1.5rem 0; }
.content-block h2 { font-family: var(--font); font-size: 1.2rem; }
.content-block ul { padding-left: 1.2rem; }
.faq details {
  border-top: 1px solid var(--line);
  padding: 0.65rem 0;
}
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 600; }
.related { display: grid; gap: 0.4rem; }
.policy-stamp { font-size: 0.8rem; color: var(--muted); }

.site-footer {
  margin-top: 3rem;
  border-top: 1px solid var(--line);
  padding: 1.5rem 0 2.5rem;
  font-size: 0.88rem;
  color: var(--muted);
}
.site-footer .cols {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  margin-bottom: 0.75rem;
}
.site-footer a { color: var(--muted); }
.ad-slot {
  margin: 1.25rem 0;
  min-height: 0;
}
.ad-slot--placeholder .ad-placeholder {
  border: 1px dashed var(--line);
  background: #fafafa;
  color: var(--muted);
  font-size: 0.8rem;
  padding: 0.75rem 1rem;
  text-align: center;
}
.ad-slot--placeholder code { font-size: 0.78rem; }