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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: #333;
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.header {
  text-align: center;
  margin-bottom: 40px;
  padding-bottom: 20px;
  border-bottom: 2px solid #eee;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 30px;
  margin-top: 30px;
}

.video-card {
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 20px;
  background: white;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  transition: transform 0.2s;
}

.video-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.video-title {
  font-size: 1.2em;
  font-weight: 600;
  margin-bottom: 10px;
  color: #2c3e50;
}

.video-date {
  color: #666;
  font-size: 0.9em;
  margin-bottom: 10px;
}

.video-description {
  color: #555;
  margin-bottom: 15px;
}

.video-links {
  display: flex;
  gap: 10px;
}

.btn {
  padding: 8px 16px;
  text-decoration: none;
  border-radius: 4px;
  font-size: 0.9em;
  font-weight: 500;
  transition: background-color 0.2s;
}

.btn-primary {
  background: #3498db;
  color: white;
}

.btn-primary:hover {
  background: #2980b9;
}

.btn-secondary {
  background: #95a5a6;
  color: white;
}

.btn-secondary:hover {
  background: #7f8c8d;
}

/* Video page styles */
.video-page {
  max-width: 800px;
  margin: 0 auto;
}

.video-embed {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  margin-bottom: 30px;
}

.video-embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 8px;
}

.video-notes {
  background: #f8f9fa;
  padding: 30px;
  border-radius: 8px;
  margin-top: 30px;
}

.back-link {
  display: inline-block;
  margin-bottom: 20px;
  color: #3498db;
  text-decoration: none;
}

.back-link:hover {
  text-decoration: underline;
}