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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f5f5f5;
  padding: 20px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  padding: 30px;
}

h1 {
  color: #333;
  margin-bottom: 10px;
}

.subtitle {
  color: #666;
  margin-bottom: 30px;
}

#dropZone {
  border: 2px dashed #ccc;
  border-radius: 8px;
  padding: 60px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s;
  background: #fafafa;
}

#dropZone:hover {
  border-color: #4caf50;
  background: #f0f8f0;
}

#dropZone.dragover {
  border-color: #4caf50;
  background: #e8f5e9;
}

.drop-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

#fileInput {
  display: none;
}

#packageInfo {
  margin: 30px 0;
  padding: 20px;
  background: #f8f9fa;
  border-radius: 6px;
  display: none;
}

#packageInfo.visible {
  display: block;
}

.info-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  margin-top: 10px;
}

.info-label {
  font-weight: 600;
  color: #555;
}

.info-value {
  color: #333;
}

#videoList {
  margin: 20px 0;
}

.video-card {
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  padding: 15px;
  margin-bottom: 15px;
  background: white;
}

.video-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.video-icon {
  font-size: 24px;
}

.video-title {
  font-size: 18px;
  font-weight: 600;
  color: #333;
}

.track-list {
  margin-left: 34px;
}

.track-item {
  padding: 8px 12px;
  margin: 5px 0;
  background: #f5f5f5;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 8px;
}

.track-item:hover {
  background: #e3f2fd;
  transform: translateX(5px);
}

.track-type {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 3px;
  font-weight: 600;
  text-transform: uppercase;
}

.track-type.observation {
  background: #e3f2fd;
  color: #1976d2;
}

.track-type.annotation {
  background: #fff3e0;
  color: #f57c00;
}

.track-type.list {
  background: #f3e5f5;
  color: #7b1fa2;
}

#visualization {
  margin-top: 30px;
  display: none;
}

#visualization.visible {
  display: block;
}

.viz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid #e0e0e0;
}

.viz-title {
  font-size: 20px;
  font-weight: 600;
}

.close-btn {
  background: #f44336;
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
}

.close-btn:hover {
  background: #d32f2f;
}

#chart {
  margin-top: 20px;
  min-height: 200px;
}

.error {
  background: #ffebee;
  color: #c62828;
  padding: 15px;
  border-radius: 6px;
  margin: 20px 0;
}

.drop-hint {
  margin-top: 10px;
  color: #666;
}

.viz-subtitle {
  color: #666;
  margin-top: 5px;
}

#chartCanvas {
  max-height: 400px;
}