:root {
  --bg: #f8f8f6;
  --surface: #ffffff;
  --text: #171717;
  --muted: #4b4b4b;
  --accent: #0a5c4a;
  --accent-2: #0c7f6f;
  --border: #d9d9d5;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at 10% 10%, #ffffff 0%, var(--bg) 48%);
  color: var(--text);
  font-family: "Avenir Next", "Segoe UI", system-ui, sans-serif;
  line-height: 1.55;
}

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

a:hover {
  color: var(--accent-2);
}

.container {
  width: min(900px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(4px);
  position: sticky;
  top: 0;
  z-index: 5;
}

.site-header .container {
  padding: 0.9rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

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

.nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav a {
  text-decoration: none;
  font-weight: 600;
}

main {
  padding: 2.2rem 0 3rem;
}

h1,
h2,
h3 {
  font-family: "Avenir Next", "Segoe UI", system-ui, sans-serif;
  letter-spacing: -0.01em;
  margin: 0 0 0.8rem;
}

h1 {
  font-size: clamp(1.9rem, 3vw, 2.6rem);
  line-height: 1.1;
}

h2 {
  margin-top: 2rem;
  font-size: clamp(1.3rem, 2.2vw, 1.7rem);
}

p {
  margin: 0.75rem 0;
  color: var(--muted);
}

ul {
  margin: 0.5rem 0 1rem 1.25rem;
}

li {
  margin-bottom: 0.45rem;
}

.hero {
  background: linear-gradient(120deg, rgba(10, 92, 74, 0.1), rgba(12, 127, 111, 0.08));
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.5rem;
}

.card-grid {
  margin-top: 1.2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 0.9rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem;
}

.card h3 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
}

.small {
  font-size: 0.95rem;
  color: #5d5d5d;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 1rem 0 2rem;
  font-size: 0.92rem;
  color: #666;
}

@media (max-width: 640px) {
  .site-header .container {
    align-items: flex-start;
    flex-direction: column;
  }

  main {
    padding-top: 1.4rem;
  }
}