body { font-family: 'Georgia', serif; background-color: #f4f6f9; color: #333; margin: 0; padding: 20px;}
.sim-container { max-width: 800px; margin: 0 auto; background: white; padding: 30px; border-radius: 10px; box-shadow: 0 4px 15px rgba(0,0,0,0.1); }
h2 { text-align: center; color: #0056b3; margin-bottom: 30px; }
.form-group { margin-bottom: 20px; }
label { font-weight: bold; display: block; margin-bottom: 8px; }
select, button { width: 100%; padding: 12px; font-size: 16px; border-radius: 6px; box-sizing: border-box; }
select { border: 1px solid #ccc; margin-bottom: 15px; }
.btn-primary { background: #0056b3; color: white; border: none; cursor: pointer; font-weight: bold; transition: 0.3s; }
.btn-primary:hover { background: #003d82; }

.option-btn { display: block; width: 100%; text-align: left; padding: 15px; margin-bottom: 12px; border: 2px solid #e0e0e0; background: #fff; cursor: pointer; border-radius: 8px; font-size: 1.05em; transition: 0.2s; }
.option-btn:hover:not(:disabled) { border-color: #0056b3; background: #f8faff;}
.option-btn:disabled { cursor: default; }

/* Feedback States */
.option-btn.correct { background: #d4edda; border-color: #28a745; color: #155724; }
.option-btn.incorrect { background: #f8d7da; border-color: #dc3545; color: #721c24; }
.option-btn.selected { background: #cce5ff; border-color: #0056b3; color: #004085; }

.feedback { display: none; margin-top: 25px; padding: 20px; border-radius: 8px; background: #e9ecef; animation: fadeIn 0.5s ease-in-out; }
.feedback h4 { margin-top: 0; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
ul.error-list { line-height: 1.8; }

/* Progress Bars */
.progress-wrapper {
    margin-top: 30px;
    width: 100%;
    border-top: 2px solid #eee;
    padding-top: 20px;
}
.progress-label {
    font-weight: bold;
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
    font-size: 0.95em;
}
.progress-bar-container {
    width: 100%;
    height: 12px;
    background-color: #e0e0e0;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 20px;
}
.progress-bar-correct {
    height: 100%;
    background-color: #28a745;
    width: 0%;
    transition: width 0.5s ease-in-out;
}
.progress-bar-incorrect {
    height: 100%;
    background-color: #dc3545;
    width: 0%;
    transition: width 0.5s ease-in-out;
}