:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --success-color: #4cc9f0;
    --error-color: #f72585;
    --warning-color: #f8961e;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --name-color: #7209b7;
    --score-color: #f72585;
    --exercise-color: #4cc9f0;
    --exercise-bg: #f8f9fa;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: #f0f2f5;
    color: var(--dark-color);
    line-height: 1.6;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 1.5rem;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 1.5rem;
}

header h1 {
    color: var(--primary-color);
    font-size: 1.8rem;
    margin-bottom: 0.25rem;
}

header .subtitle {
    color: var(--gray-color);
    font-size: 0.95rem;
}

.user-section {
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #f5f1cb 0%, #f1c2e3 100%);
    padding: 0.75rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.input-group {
    margin-bottom: 0.75rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.25rem;
    font-weight: 600;
    color: var(--name-color);
    font-size: 0.9rem;
}

.input-group input {
    width: 100%;
    padding: 0.5rem;
    border: 2px solid var(--name-color);
    border-radius: var(--border-radius);
    font-size: 0.95rem;
    color: var(--name-color);
    font-weight: 500;
}

.stats {
    display: flex;
    justify-content: space-around;
    gap: 0.75rem;
}

.stat-box {
    flex: 1;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    text-align: center;
    font-size: 0.9rem;
}

.score-box {
    background: linear-gradient(135deg, rgba(247, 37, 133, 0.1) 0%, rgba(247, 37, 133, 0.2) 100%);
    border: 1px solid var(--score-color);
}

.exercise-box {
    background: linear-gradient(135deg, rgba(76, 201, 240, 0.1) 0%, rgba(76, 201, 240, 0.2) 100%);
    border: 1px solid var(--exercise-color);
}

.stat-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.stat-value {
    display: block;
    font-weight: 700;
    font-size: 1.1rem;
}

#score {
    color: var(--score-color);
}

#exerciseCount {
    color: var(--exercise-color);
}

.exercise-container {
    margin-bottom: 1rem;
}

.exercise-card {
    background-color: var(--exercise-bg);
    padding: 1rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.exercise-prompt {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--dark-color);
    font-weight: 500;
    text-align: center;
}

.proportionality-table {
    margin: 1rem 0;
    width: 100%;
    border-collapse: collapse;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    overflow: hidden;
}

.proportionality-table th, 
.proportionality-table td {
    padding: 0.75rem;
    text-align: center;
    border: 1px solid #dee2e6;
}

.proportionality-table th {
    background-color: var(--primary-color);
    color: white;
    font-weight: 500;
}

.proportionality-table tr:nth-child(even) {
    background-color: #f8f9fa;
}

/* Estilos para la tabla */
.proportionality-table thead th {
    background-color: #4361ee; /* Azul */
    color: white;
}

.proportionality-table tbody td {
    background-color: #f8f9fa; /* Gris claro */
}

.proportionality-table tbody td:first-child {
    background-color: #4361ee; /* Azul para la primera columna del cuerpo */
    color: white;
}

.table-caption {
    font-size: 0.9rem;
    color: var(--gray-color);
    text-align: center;
    margin-top: 0.5rem;
}

.options-container {
    margin: 1.5rem 0;
}

.option-item {
    margin-bottom: 0.75rem;
    padding: 0.75rem;
    background-color: white;
    border: 1px solid #dee2e6;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s;
}

.option-item:hover {
    background-color: #f8f9fa;
    border-color: var(--primary-color);
}

.option-item.selected {
    background-color: rgba(67, 97, 238, 0.1);
    border-color: var(--primary-color);
}

.option-item.correct {
    background-color: rgba(76, 201, 240, 0.2);
    border-color: var(--success-color);
}

.option-item.incorrect {
    background-color: rgba(247, 37, 133, 0.1);
    border-color: var(--error-color);
}

.option-item input[type="radio"] {
    margin-right: 0.5rem;
}

.button-group {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.btn {
    flex: 1;
    padding: 0.6rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn.primary {
    background-color: var(--primary-color);
    color: white;
}

.btn.primary:hover {
    background-color: var(--secondary-color);
}

.btn.secondary {
    background-color: var(--gray-color);
    color: white;
}

.btn.secondary:hover {
    background-color: #5a6268;
}

.btn:disabled {
    background-color: #e9ecef;
    color: #adb5bd;
    cursor: not-allowed;
}

.feedback-message {
    padding: 0.75rem;
    border-radius: var(--border-radius);
    text-align: center;
    font-weight: 500;
    font-size: 0.95rem;
    margin-top: 1rem;
}

.feedback-message.success {
    background-color: rgba(76, 201, 240, 0.2);
    color: var(--success-color);
}

.feedback-message.error {
    background-color: rgba(247, 37, 133, 0.2);
    color: var(--error-color);
}

.feedback-message.info {
    background-color: rgba(248, 150, 30, 0.2);
    color: var(--warning-color);
}

@media (max-width: 480px) {
    .container {
        padding: 1rem;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    .button-group {
        flex-direction: column;
    }
}