:root { --max: 980px; }

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  line-height: 1.6;
}

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 32px 18px;
}

.site-header {
  border-bottom: 1px solid #eee;
}

.site-footer {
  border-top: 1px solid #eee;
  padding: 24px 0;
  margin-top: 48px;
  font-size: 14px;
}

.nav {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
  padding: 18px 18px;
  max-width: var(--max);
  margin: 0 auto;
}

.nav a { text-decoration: none; }

.hero h1, .hero h2 { line-height: 1.15; margin: 0 0 10px 0; }
.hero p { max-width: 70ch; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.card {
  border: 1px solid #eee;
  border-radius: 14px;
  padding: 16px;
}

.btn {
  display: inline-block;
  border: 1px solid #111;
  border-radius: 12px;
  padding: 10px 14px;
  text-decoration: none;
}

/* small UX polish */
.nav a:hover { text-decoration: underline; }
.btn:hover { background: #111; color: #fff; }
.btn:focus, .nav a:focus { outline: 2px solid #111; outline-offset: 2px; }