.projection-demo {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    padding: 25px;
    margin: 25px 0;
    color: white;
    position: relative;
    overflow: hidden;
}
.card-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin: 30px 0;
    justify-content: center;
}
.card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    padding: 20px;
    min-width: 280px;
    color: #333;
    transition: all 0.3s ease;
}
.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.2);
}
.card-header {
    font-weight: bold;
    font-size: 1.2em;
    margin-bottom: 15px;
    color: #3498db;
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 10px;
}
.slot-visual {
    background: #f8f9fa;
    border: 2px dashed #dee2e6;
    border-radius: 8px;
    padding: 15px;
    margin: 10px 0;
    text-align: center;
    min-height: 60px;
    position: relative;
}
.slot-label {
    position: absolute;
    top: -10px;
    left: 10px;
    background: #3498db;
    color: white;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.8em;
}
.code-block {
    margin: 25px 0;
    position: relative;
}
.note-box {
    background: #e7f3ff;
    border-left: 4px solid #2196f3;
    padding: 15px;
    margin: 20px 0;
    border-radius: 4px;
}
.warning-box {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 15px;
    margin: 20px 0;
    border-radius: 4px;
}
.success-box {
    background: #d4edda;
    border-left: 4px solid #28a745;
    padding: 15px;
    margin: 20px 0;
    border-radius: 4px;
}
.projection-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 20px 0;
    flex-wrap: wrap;
}
.flow-step {
    background: white;
    border: 2px solid #4caf50;
    border-radius: 8px;
    padding: 15px;
    margin: 10px;
    text-align: center;
    min-width: 150px;
    position: relative;
}
.flow-step:after {
    content: '→';
    position: absolute;
    right: -20px;
    top: 50%;
    transform: translateY(-50%);
    color: #6c757d;
    font-size: 1.5em;
}
.flow-step:last-child:after {
    content: '';
}