/* Kingo Calculators — shared styles */
:root {
  --primary: #1d4ed8;
  --primary-dark: #173db0;
  --accent: #047857;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08), 0 4px 12px rgba(15, 23, 42, 0.05);
  --max-width: 860px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
}

/* Header / Footer */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 14px 20px;
}
.site-header .inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.logo span { color: var(--text); }
.nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 18px;
  font-size: 0.95rem;
}
.nav a:hover { color: var(--primary); }

.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  margin-top: 48px;
  padding: 28px 20px;
  font-size: 0.9rem;
  color: var(--muted);
}
.site-footer .inner { max-width: var(--max-width); margin: 0 auto; }
.site-footer a { color: var(--muted); }
.site-footer .disclaimer { margin-top: 12px; font-size: 0.82rem; color: #64748b; }

/* Layout */
main { max-width: var(--max-width); margin: 0 auto; padding: 32px 20px 0; }

h1 { font-size: 2rem; letter-spacing: -0.02em; line-height: 1.25; margin-bottom: 12px; }
h2 { font-size: 1.35rem; margin: 32px 0 12px; letter-spacing: -0.01em; }
h3 { font-size: 1.08rem; margin: 20px 0 8px; }
p { margin-bottom: 14px; color: var(--muted); }
p.lede { font-size: 1.08rem; color: var(--text); }

ul.plain { margin: 0 0 14px 20px; color: var(--muted); }
ul.plain li { margin-bottom: 6px; }

/* Calculator card */
.calc-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin: 24px 0;
}
.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}
.field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}
.field input, .field select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  background: #fff;
  color: var(--text);
}
.field input:focus, .field select:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
  border-color: var(--primary);
}
.btn {
  display: inline-block;
  margin-top: 16px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 12px 26px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}
.btn:hover { background: var(--primary-dark); }

/* Results */
.results {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px dashed var(--border);
}
.results h3 { margin-top: 0; }
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}
.result-item {
  background: #f1f5f9;
  border-radius: 8px;
  padding: 12px 14px;
}
.result-item .label { font-size: 0.8rem; color: var(--muted); }
.result-item .value { font-size: 1.3rem; font-weight: 700; color: var(--primary); }
.result-item .value.green { color: var(--accent); }
.result-item .value.red { color: #b91c1c; }

table.result-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 14px;
  font-size: 0.92rem;
}
table.result-table th, table.result-table td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}
table.result-table th { color: var(--muted); font-weight: 600; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.03em; }
table.result-table td.num { text-align: right; font-variant-numeric: tabular-nums; }

.warning { color: #b45309; font-size: 0.9rem; margin-top: 10px; }

/* Hub cards */
.hero {
  background: linear-gradient(135deg, #eff6ff 0%, #f0fdf4 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  margin-bottom: 32px;
}
.hero h1 { margin-bottom: 10px; }
.hero p { max-width: 640px; }

.category { margin-bottom: 30px; }
.category h2 { margin-top: 0; margin-bottom: 14px; }
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}
.tool-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  text-decoration: none;
  color: var(--text);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.tool-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.tool-card .name { font-weight: 700; color: var(--primary); margin-bottom: 4px; }
.tool-card .desc { font-size: 0.88rem; color: var(--muted); }

/* FAQ */
details.faq {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 18px;
  margin-bottom: 10px;
}
details.faq summary { font-weight: 600; cursor: pointer; color: var(--text); }
details.faq p { margin-top: 10px; }

/* Related links */
.related {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 32px 0;
}
.related ul { list-style: none; }
.related li { margin-bottom: 8px; }
.related a { color: var(--primary); font-weight: 600; text-decoration: none; }
.related a:hover { text-decoration: underline; }
.related .why { color: var(--muted); font-weight: 400; }

/* Ad placeholder */
.ad-slot {
  margin: 28px 0;
  min-height: 90px;
  background: #f1f5f9;
  border: 1px dashed #cbd5e1;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #94a3b8;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.formula {
  background: #f1f5f9;
  border-radius: 8px;
  padding: 14px 18px;
  font-family: "SF Mono", Consolas, monospace;
  font-size: 0.95rem;
  margin: 14px 0;
  overflow-x: auto;
  white-space: nowrap;
}

@media (max-width: 640px) {
  h1 { font-size: 1.6rem; }
  .calc-card { padding: 18px; }
}