:root {
  --ink: #202124;
  --muted: #5f6368;
  --line: #d9dee3;
  --bg: #f7f8f7;
  --panel: #ffffff;
  --green: #3d6b57;
  --green-dark: #244838;
  --amber: #b67832;
  --blue: #48667b;
  --shadow: 0 18px 45px rgba(32, 33, 36, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Avenir Next", "Segoe UI", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}

a {
  color: var(--green-dark);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

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

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 6px;
  background-color: #f4efe2;
  background-image: url("/assets/logo-gravel-driveway-cost.png");
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  box-shadow: inset 0 0 0 1px rgba(36, 72, 56, 0.1);
}

.nav-links {
  display: flex;
  gap: 18px;
  font-size: 14px;
  color: var(--muted);
}

.hero {
  background:
    radial-gradient(circle at top left, rgba(255, 215, 168, 0.28), transparent 32%),
    linear-gradient(135deg, #2f5145, #46697a 58%, #6f7f65);
  color: white;
}

.hero-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 86px 20px 92px;
}

.eyebrow {
  margin: 0 0 12px;
  font-weight: 700;
  color: #f2c879;
  text-transform: uppercase;
  font-size: 13px;
}

h1,
h2,
h3 {
  line-height: 1.12;
  margin: 0;
}

h1 {
  max-width: 780px;
  font-size: clamp(42px, 7vw, 76px);
}

.hero p {
  max-width: 690px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 19px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border-radius: 6px;
  background: var(--green);
  color: white;
  font-weight: 700;
  border: 1px solid transparent;
}

.button.secondary {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.5);
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 42px 20px;
}

.grid {
  display: grid;
  gap: 18px;
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid.two {
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
}

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

.card h3 {
  margin-bottom: 8px;
  font-size: 20px;
}

.muted {
  color: var(--muted);
}

.calculator {
  display: grid;
  gap: 16px;
}

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

label {
  font-weight: 700;
  font-size: 14px;
}

input,
select {
  width: 100%;
  min-height: 42px;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font: inherit;
  background: white;
}

.result {
  background: #eef5f0;
  border: 1px solid #cfe0d6;
  border-radius: 8px;
  padding: 18px;
}

.result strong {
  display: block;
  font-size: 34px;
  color: var(--green-dark);
}

.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
  border: 1px solid var(--line);
}

.table th,
.table td {
  padding: 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.table th {
  background: #edf1ef;
}

.article {
  max-width: 820px;
}

.article h2 {
  margin-top: 34px;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #ffffff;
  color: var(--muted);
}

.site-footer .container {
  padding-top: 24px;
  padding-bottom: 24px;
}

@media (max-width: 760px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    flex-wrap: wrap;
  }

  h1 {
    font-size: clamp(38px, 12vw, 56px);
  }

  .hero p {
    font-size: 18px;
  }

  .hero-inner {
    padding-top: 58px;
    padding-bottom: 68px;
  }

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