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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #0d1117;
  color: #fff;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

main {
  text-align: center;
}

img {
  width: 120px;
  margin-bottom: 24px;
}

h1 {
  font-size: 3rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.tagline {
  color: #8b949e;
  font-size: 1.1rem;
  margin-bottom: 24px;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  background: #238636;
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 500;
  transition: background 0.2s;
}

.btn:hover {
  background: #2ea043;
}