:root {
  --bg-color: #000000;
  --text-color: #f1f1f1;
  --accent-color: #ff3b30;
  --link-color: #ff453a;
  --card-bg: #1c1c1e;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  margin: 0;
  padding: 0;
}

header {
  text-align: center;
  padding: 4rem 2rem 2rem;
}

header h1 {
  font-size: 3rem;
  margin: 0 0 1rem;
  font-weight: 800;
  letter-spacing: -0.05em;
}

header p {
  font-size: 1.2rem;
  color: #a1a1a6;
  max-width: 600px;
  margin: 0 auto;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
}

.card {
  background-color: var(--card-bg);
  border-radius: 16px;
  padding: 2rem;
  margin-bottom: 2rem;
}

a {
  color: var(--link-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.btn {
  display: inline-block;
  background-color: var(--accent-color);
  color: white;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: bold;
  margin-top: 1rem;
  transition: opacity 0.2s;
}

.btn:hover {
  opacity: 0.9;
  text-decoration: none;
}

footer {
  text-align: center;
  padding: 2rem;
  color: #86868b;
  font-size: 0.9rem;
  margin-top: 4rem;
  border-top: 1px solid #333;
}

nav {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 1rem;
}

nav a {
  color: #86868b;
}

nav a:hover {
  color: var(--text-color);
}