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

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  background: #0d1117;
  color: #e6edf3;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a:hover {
  text-decoration: underline;
}

header {
  text-align: center;
  padding: 3rem 1rem 2rem;
  border-bottom: 1px solid #21262d;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

header h1 a {
  color: #e6edf3;
}

header h1 a:hover {
  color: #58a6ff;
  text-decoration: none;
}

header p {
  color: #8b949e;
  max-width: 540px;
  margin: 0 auto 1rem;
  font-size: 1rem;
}

.channel-link {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  border: 1px solid #30363d;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: #c9d1d9;
  transition: background 0.2s, border-color 0.2s;
}

.channel-link:hover {
  background: #161b22;
  border-color: #58a6ff;
  text-decoration: none;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  padding: 2rem 1rem;
  max-width: 1200px;
  margin: 0 auto;
  flex: 1;
}

.card {
  background: #161b22;
  border: 1px solid #21262d;
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  border-color: #58a6ff;
  box-shadow: 0 8px 24px rgba(88, 166, 255, 0.1);
}

.thumbnail-link {
  display: block;
  line-height: 0;
}

.thumbnail-link img {
  width: 100%;
  height: auto;
  display: block;
}

.card-body {
  padding: 1rem;
}

.card-body h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  line-height: 1.4;
}

.card-body h2 a {
  color: #e6edf3;
}

.card-body h2 a:hover {
  color: #58a6ff;
}

.card-body time {
  display: block;
  font-size: 0.8rem;
  color: #484f58;
  margin-bottom: 0.5rem;
  font-variant-numeric: tabular-nums;
}

.card-body p {
  font-size: 0.85rem;
  color: #8b949e;
}

footer {
  text-align: center;
  padding: 1.5rem;
  border-top: 1px solid #21262d;
  font-size: 0.8rem;
}

footer a {
  color: #484f58;
}

footer a:hover {
  color: #58a6ff;
}

@media (max-width: 720px) {
  .video-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 1rem;
  }

  header {
    padding: 2rem 1rem 1.5rem;
  }

  header h1 {
    font-size: 1.5rem;
  }
}