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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Common Section */
.common-section {
    background-color: white;
    padding: 40px;
    margin-bottom: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.common-content ul {
  margin: 0 0 1rem 0;      /* bottom spacing */
  padding-left: 1.25rem;  /* indent bullets */
}

.common-section h1 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    color: #2c3e50;
}

.common-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.overview-image {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin-bottom: 10px;
}

.common-content p {
    font-size: 1.1rem;
    text-align: justify;
}

/* Experiment Sections */
.experiment {
    background-color: white;
    padding: 40px;
    margin-bottom: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.experiment h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: #2c3e50;
    border-bottom: 3px solid #3498db;
    padding-bottom: 10px;
}

.panel-description {
    margin-bottom: 30px;
    padding: 20px;
    background-color: #f8f9fa;
    border-left: 4px solid #3498db;
    border-radius: 4px;
}

.panel-description p {
    font-size: 1.05rem;
}

/* Video Grid */
.video-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    justify-content: space-between;
}

.video-item {
    flex: 1 1 300px;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.video-item video {
    width: 100%;
    height: auto;
    border-radius: 4px;
    background-color: #000;
}

.video-caption {
    font-size: 0.95rem;
    color: #555;
    font-style: italic;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .common-section,
    .experiment {
        padding: 20px;
    }
    
    .common-section h1 {
        font-size: 2rem;
    }
    
    .experiment h2 {
        font-size: 1.5rem;
    }
    
    .video-grid {
        gap: 20px;
    }
    
    .video-item {
        flex: 1 1 100%;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .video-item {
        flex: 1 1 calc(50% - 15px);
    }
}

@media (min-width: 1025px) {
    .video-item {
        flex: 1 1 calc(33.333% - 20px);
    }
}