:root {
  --bg: #f7f8fb;
  --surface: #ffffff;
  --surface-2: #eef3f8;
  --ink: #172033;
  --muted: #5d6b82;
  --line: #dbe3ee;
  --brand: #0f766e;
  --brand-2: #2563eb;
  --accent: #f59e0b;
  --good: #166534;
  --warn: #9a3412;
  --max: 1120px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  line-height: 1.65;
}

a {
  color: var(--brand-2);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header,
.site-footer {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.site-footer {
  border-top: 1px solid var(--line);
  border-bottom: 0;
  margin-top: 56px;
}

.nav,
.footer-inner,
.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 22px;
}

.nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: 0;
}

.mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 14px;
}

.nav-links a {
  color: var(--muted);
}

.hero {
  padding: 70px 0 42px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  gap: 36px;
  align-items: center;
}

.eyebrow {
  color: var(--brand);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.15;
  letter-spacing: 0;
}

h1 {
  max-width: 820px;
  margin: 12px 0 18px;
  font-size: clamp(38px, 7vw, 72px);
}

h2 {
  margin: 0 0 16px;
  font-size: clamp(26px, 4vw, 38px);
}

h3 {
  margin: 0 0 8px;
  font-size: 19px;
}

p {
  margin: 0 0 16px;
}

.lead {
  max-width: 740px;
  color: var(--muted);
  font-size: 19px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding: 10px 16px;
  font-weight: 750;
  background: var(--brand);
  color: #fff;
  border: 1px solid var(--brand);
}

.button:hover {
  text-decoration: none;
  filter: brightness(1.04);
}

.button.secondary {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--line);
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
}

.metric-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.metric-list li {
  display: grid;
  gap: 2px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.metric-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.metric-list b {
  font-size: 22px;
}

.metric-list span {
  color: var(--muted);
  font-size: 14px;
}

.section {
  padding: 34px 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
}

.card p,
.fine,
.article-meta {
  color: var(--muted);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  border-radius: 999px;
  padding: 4px 10px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

.article {
  max-width: 840px;
  padding-top: 46px;
}

.article h1 {
  font-size: clamp(34px, 5vw, 58px);
}

.article h2 {
  margin-top: 36px;
  font-size: 28px;
}

.article ul,
.article ol {
  padding-left: 22px;
}

.table-wrap {
  overflow-x: auto;
  margin: 18px 0 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

th,
td {
  padding: 13px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface-2);
  font-size: 13px;
  text-transform: uppercase;
  color: var(--muted);
}

tr:last-child td {
  border-bottom: 0;
}

.notice {
  border-left: 4px solid var(--accent);
  background: #fff8eb;
  padding: 14px 16px;
  border-radius: 8px;
  margin: 22px 0;
}

.calculator {
  display: grid;
  gap: 14px;
}

.field {
  display: grid;
  gap: 6px;
}

label {
  font-weight: 700;
}

select,
input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 11px 12px;
  font: inherit;
  background: #fff;
  color: var(--ink);
}

textarea {
  min-height: 140px;
}

.result {
  border: 1px solid #bbf7d0;
  background: #f0fdf4;
  color: var(--good);
  border-radius: 8px;
  padding: 16px;
  font-weight: 750;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  padding-top: 26px;
  padding-bottom: 30px;
  color: var(--muted);
  font-size: 14px;
}

.footer-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

@media (max-width: 820px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding-top: 16px;
    padding-bottom: 16px;
  }

  .hero-grid,
  .grid,
  .grid.two {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 44px;
  }
}