.iot-module-true-false-not-given { margin-bottom: 30px; }

.iot-tfng-item {
    background: #f8fafc;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    padding: 18px 20px;
    margin-bottom: 15px;
    transition: 0.2s;
}

.iot-tfng-item:hover {
    border-color: #94a3b8;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.iot-tfng-statement {
    font-size: 16px;
    color: #1e293b;
    margin-bottom: 15px;
    line-height: 1.6;
}

.iot-tfng-options {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.iot-tfng-opt {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #fff;
    border: 2px solid #cbd5e1;
    padding: 8px 18px;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 600;
    color: #475569;
    font-size: 15px;
    user-select: none;
}

.iot-tfng-opt:hover {
    border-color: #3b82f6;
    color: #1d4ed8;
}

.iot-tfng-opt input[type="radio"] {
    margin: 0;
    width: 16px;
    height: 16px;
    accent-color: #2563EB;
    cursor: pointer;
}

.iot-tfng-opt:has(input:checked) {
    border-color: #2563EB;
    background: #eff6ff;
    color: #1d4ed8;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

/* KẾT QUẢ CHẤM ĐIỂM */
.iot-tfng-opt.iot-opt-correct {
    background: #dcfce7 !important;
    border-color: #22c55e !important;
    color: #155724 !important;
    box-shadow: none !important;
}

.iot-tfng-opt.iot-opt-wrong {
    background: #fee2e2 !important;
    border-color: #ef4444 !important;
    color: #7f1d1d !important;
    box-shadow: none !important;
    text-decoration: line-through;
}

@media (max-width: 600px) {
    .iot-tfng-options { flex-direction: column; gap: 10px; }
    .iot-tfng-opt { width: 100%; box-sizing: border-box; }
}