:root {
  --ink: #16212b;
  --ink-soft: #4a5a68;
  --paper: #f7f9fa;
  --accent: #1f7a5c;
  --accent-dark: #145842;
  --line: #dde4e6;
  --card: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--line);
  background: var(--card);
}

.brand { font-weight: 700; font-size: 1.15rem; color: var(--ink); text-decoration: none; }

.site-header nav { display: flex; flex-wrap: wrap; gap: 1rem; font-size: 0.9rem; }
.site-header nav a { color: var(--ink-soft); text-decoration: none; }
.site-header nav a:hover { color: var(--accent); }

main { max-width: 900px; margin: 0 auto; padding: 2rem 1.5rem 3rem; }

h1 { font-size: 2rem; margin-bottom: 0.3rem; }
h2 { font-size: 1.4rem; margin-top: 2.2rem; }
h3 { font-size: 1.05rem; }

.lede { font-size: 1.1rem; color: var(--ink-soft); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 1.1rem; }
.card a { color: var(--accent-dark); text-decoration: none; font-weight: 600; }

.callout {
  background: #eaf5ef;
  border: 1px solid #bfe0cd;
  border-radius: 10px;
  padding: 1rem 1.2rem;
  margin: 1.5rem 0;
}

.cta-box {
  background: var(--card);
  border: 1px dashed var(--accent);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  margin: 1.5rem 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

table { width: 100%; border-collapse: collapse; margin: 1.2rem 0; font-size: 0.92rem; }
th, td { text-align: left; padding: 0.5rem 0.6rem; border-bottom: 1px solid var(--line); }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem;
  max-width: 900px;
  margin: 0 auto;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.fine-print { font-size: 0.78rem; }

/* Calculator */
.calculator {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1.5rem;
  margin: 1.5rem 0 2rem;
}

.calc-section + .calc-section { margin-top: 1.75rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }

.load-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.4rem 0;
}

.load-row label { font-size: 0.95rem; }
.load-row input[type="number"] { width: 90px; padding: 0.3rem 0.5rem; border: 1px solid var(--line); border-radius: 6px; }

.calc-field { margin: 0.75rem 0; }
.calc-field label { display: block; font-size: 0.9rem; color: var(--ink-soft); margin-bottom: 0.25rem; }
.calc-field input[type="number"] { width: 140px; padding: 0.4rem 0.6rem; border: 1px solid var(--line); border-radius: 6px; font-size: 1rem; }

.result-panel {
  margin-top: 1.25rem;
  background: #eaf5ef;
  border: 1px solid #bfe0cd;
  border-radius: 10px;
  padding: 1rem 1.2rem;
}

.result-panel .big { font-size: 1.6rem; font-weight: 700; color: var(--accent-dark); }
.result-panel .small { font-size: 0.85rem; color: var(--ink-soft); }

@media (max-width: 600px) {
  main { padding: 1.5rem 1rem 2.5rem; }
  .load-row { grid-template-columns: auto 1fr; }
  .load-row input[type="number"] { grid-column: 2; justify-self: end; }
}