/* Heredamos la estructura visual del LNZ Activity Dashboard de forma independiente */
.b737-exam-container {
    --bg-dark: #0b1220;
    --bg-card: #151e32;
    --text-white: #ffffff;
    --text-muted: #a7b4d6;
    --accent: #3498db;
    --danger: #e74c3c;
    --success: #2ecc71;
    --warning: #f1c40f;
    --border: rgba(255,255,255,0.08);

    background: var(--bg-dark);
    padding: 30px;
    border-radius: 16px;
    color: var(--text-white);
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    border: 1px solid var(--border);
    box-shadow: 0 20px 50px rgba(0,0,0,0.3);
    max-width: 1000px;
    margin: 20px auto;
    box-sizing: border-box;
}

.b737-exam-container * { box-sizing: border-box; }
.b737-exam-container p { line-height: 1.5; }

/* Cabeceras y Tarjetas base */
.b737-exam-container .lnz-ad-header { margin-bottom: 25px; border-bottom: 1px solid var(--border); padding-bottom: 15px; }
.b737-exam-container .lnz-ad-pretitle { font-size: 0.85rem; text-transform: uppercase; font-weight: bold; letter-spacing: 1px; display: block; margin-bottom: 5px; color: var(--accent); }
.b737-exam-container h2 { margin: 0; font-size: 1.8rem; color: #fff; }
.b737-exam-container .lnz-ad-card { background: var(--bg-card); padding: 25px; border-radius: 12px; border: 1px solid var(--border); margin-bottom: 20px; }
.b737-exam-container h3 { color: var(--accent); margin-top: 0; margin-bottom: 15px; font-size: 1.1rem; border-bottom: 1px dashed rgba(255,255,255,0.05); padding-bottom: 10px; display: flex; align-items: center; gap: 8px; }

/* Botones de navegación superiores */
.b737-exam-container .lnz-ad-page-btn { background: rgba(0,0,0,0.3); border: 1px solid var(--border); color: #fff; padding: 8px 15px; border-radius: 6px; cursor: pointer; transition: 0.3s; font-size: 0.9rem; }
.b737-exam-container .lnz-ad-page-btn:hover { background: var(--accent); border-color: var(--accent); }

/* Área de Pregunta */
.b737-question-box { font-size: 1.2rem; color: var(--text-white); margin-bottom: 20px; padding-bottom: 15px; border-bottom: 1px dashed var(--border); }
.b737-options-grid { display: flex; flex-direction: column; gap: 12px; }

/* Opciones tipo test */
.b737-option-btn {
    background: rgba(0,0,0,0.25);
    border: 1px solid var(--border);
    color: var(--text-white);
    padding: 15px 20px;
    border-radius: 8px;
    text-align: left;
    cursor: pointer;
    transition: 0.3s;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 15px;
}
.b737-option-btn:hover:not(:disabled) { background: rgba(255,255,255,0.05); border-color: var(--accent); }

/* Letra de la opción (A, B, C, D) */
.b737-option-letter { background: rgba(0,0,0,0.4); color: var(--accent); padding: 5px 12px; border-radius: 6px; font-weight: bold; }

/* Feedback de colores (Correcto / Incorrecto) */
.b737-option-btn.correct { background: rgba(46, 204, 113, 0.1); border-color: var(--success); }
.b737-option-btn.correct .b737-option-letter { color: var(--success); }
.b737-option-btn.incorrect { background: rgba(231, 76, 60, 0.1); border-color: var(--danger); opacity: 0.8; }
.b737-option-btn.incorrect .b737-option-letter { color: var(--danger); }

/* Botones de acción principales */
.b737-action-btn { background: var(--accent); color: #fff; border: none; padding: 12px 25px; border-radius: 6px; cursor: pointer; font-weight: bold; transition: 0.3s; margin-top: 20px; width: 100%; font-size: 1rem;}
.b737-action-btn:hover:not(:disabled) { background: #2980b9; }
.b737-action-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* --- Pestañas Activas --- */
.b737-exam-container .lnz-ad-page-btn.active-tab { background: var(--accent); border-color: var(--accent); font-weight: bold; }

/* --- Tablas para el Historial --- */
.lnz-ad-table-wrapper { width: 100%; overflow-x: auto; border: 1px solid var(--border); border-radius: 8px; background: rgba(0,0,0,0.15); margin-top: 15px;}
.lnz-ad-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 0.9rem; }
.lnz-ad-table th { background: rgba(0,0,0,0.4); color: var(--accent); padding: 12px 15px; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.5px; border-bottom: 2px solid var(--border); }
.lnz-ad-table td { padding: 12px 15px; border-bottom: 1px solid rgba(255,255,255,0.03); color: var(--text-white); }
.lnz-ad-table tbody tr:hover { background: rgba(255,255,255,0.03); }
.lnz-ad-table tbody tr:last-child td { border-bottom: none; }