* { box-sizing: border-box; margin: 0; padding: 0; font-family: sans-serif; }

body {
  background-color: #121212;
  color: #fff;
  padding: 1rem;
}

header {
  text-align: center;
  padding: 1rem;
}

nav {
  display: flex;
  justify-content: space-around;
  margin: 1rem 0;
}

nav a {
  color: #1db954;
  text-decoration: none;
  padding: 0.5rem;
}

.card, .channel-card {
  background-color: #1e1e1e;
  padding: 1rem;
  margin: 1rem 0;
  border-radius: 8px;
  text-align: center;
}

.channel-list video {
  width: 100%;
  max-height: 200px;
  border-radius: 8px;
}

.categories {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 1rem;
}