:root {
  --ink: #1c2430;
  --paper: #faf9f6;
  --card: #ffffff;
  --line: #ddd8ce;
  --accent: #1f6f54;
  --accent-dark: #17573f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
  font-size: 17px;
}

.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.1rem;
}

a {
  color: var(--accent);
}

a:hover {
  color: var(--accent-dark);
}

/* Header */

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

.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.4rem 1.5rem;
  padding-top: 0.9rem;
  padding-bottom: 0.9rem;
}

.brand {
  margin: 0;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.01em;
}

.site-nav a {
  margin-left: 1.1rem;
  text-decoration: none;
  font-size: 0.98rem;
}

.site-nav a:first-child {
  margin-left: 0;
}

/* Sections */

main section {
  padding: 1.6rem 0 0.4rem;
}

h1 {
  font-size: 1.9rem;
  line-height: 1.25;
  margin: 0.6rem 0 0.8rem;
}

h2 {
  font-size: 1.35rem;
  margin: 0 0 0.9rem;
  padding-bottom: 0.35rem;
  border-bottom: 2px solid var(--accent);
}

h3 {
  font-size: 1.08rem;
  margin: 0 0 0.45rem;
}

p {
  margin: 0 0 0.85rem;
}

.intro p {
  max-width: 44rem;
}

/* Cards */

.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 640px) {
  .cards {
    grid-template-columns: 1fr 1fr;
  }
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.1rem 1.15rem;
}

.card p {
  margin-bottom: 0.7rem;
}

.card-link {
  font-weight: 600;
  text-decoration: none;
}

.card-link:hover {
  text-decoration: underline;
}

/* Button */

.button {
  display: inline-block;
  background: var(--accent);
  color: #ffffff;
  text-decoration: none;
  font-weight: 600;
  padding: 0.6rem 1.2rem;
  border-radius: 6px;
}

.button:hover {
  background: var(--accent-dark);
  color: #ffffff;
}

/* Footer */

.site-footer {
  margin-top: 2.6rem;
  border-top: 1px solid var(--line);
  background: var(--card);
  padding: 1.3rem 0 1.6rem;
  font-size: 0.95rem;
}

.site-footer p {
  margin-bottom: 0.3rem;
}