* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: #0d1117;
  color: #c9d1d9;
  line-height: 1.6;
}

header {
  background-color: #161b22;
  border-bottom: 1px solid #30363d;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

header .logo {
  font-size: 1.5rem;
}

header h1 {
  font-size: 1.25rem;
  color: #f0f6fc;
}

main {
  max-width: 860px;
  margin: 3rem auto;
  padding: 0 1.5rem;
}

.hero {
  text-align: center;
  padding: 3rem 0;
}

.hero h2 {
  font-size: 2.5rem;
  color: #f0f6fc;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.125rem;
  color: #8b949e;
  max-width: 560px;
  margin: 0 auto 2rem;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.4rem;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: background-color 0.2s;
}

.btn-primary {
  background-color: #238636;
  color: #ffffff;
  border: 1px solid #2ea043;
}

.btn-primary:hover {
  background-color: #2ea043;
}

.btn-secondary {
  background-color: #21262d;
  color: #c9d1d9;
  border: 1px solid #30363d;
  margin-left: 0.75rem;
}

.btn-secondary:hover {
  background-color: #30363d;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.card {
  background-color: #161b22;
  border: 1px solid #30363d;
  border-radius: 6px;
  padding: 1.5rem;
}

.card .icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.card h3 {
  color: #f0f6fc;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.card p {
  color: #8b949e;
  font-size: 0.925rem;
}

footer {
  text-align: center;
  padding: 2rem;
  margin-top: 4rem;
  border-top: 1px solid #30363d;
  color: #8b949e;
  font-size: 0.875rem;
}

footer a {
  color: #58a6ff;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}