.trainer-container {
    max-width: 600px;
    margin: 0 auto;
    background-color: #34495e;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
}

.question-container {
    padding: 20px;
    border-bottom: 1px solid #2c3e50;
    white-space: pre-line;
}

.question-container h2 {
    color: #3498db;
    margin-bottom: 10px;
}

.code-container {
    display: flex;
    padding: 20px;
}

.line-numbers {
    border-right: 1px solid #2c3e50;
    padding-right: 8px;
    margin-right: 8px;
    user-select: none;
    color: #7f8c8d;
    font-family: monospace;
}

.code {
    flex: 1;
    min-height: 7em;
    padding: 8px;
    font-family: monospace;
    resize: vertical;
    background-color: #2c3e50;
    color: #ecf0f1;
    border: 1px solid #2c3e50;
    border-radius: 4px;
}

.check-btn {
    width: 100%;
    padding: 15px;
    background-color: #3498db;
    color: #ecf0f1;
    border: none;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

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

.check-btn.correct {
    background-color: #2ecc71;
}

.check-btn.incorrect {
    background-color: #e74c3c;
}

.score-display {
    position: fixed;
    top: 20px;
    right: 20px;
    background-color: #34495e;
    padding: 10px 20px;
    border-radius: 4px;
    z-index: 50;
    box-shadow: 0 0 10px rgba(0,0,0,0.3);
}